fixed site sample to be more expressive

Declare List.add in stdlib

.gitignore

@@ -20,3 +20,10 @@ xcuserdata
 .output*.txt
 debug.log
 /build.log
+/test.md
+/build_output.txt
+/build_output_full.txt
+/check_output.txt
+/compile_jvm_output.txt
+/compile_metadata_output.txt
+test_output*.txt

.junie/guidelines.md

@@ -0,0 +1,11 @@
+# Lyng Project Guidelines
+
+This project uses the Lyng scripting language for multiplatform scripting.
+
+## Coding in Lyng
+When writing, refactoring, or analyzing Lyng code:
+- **Reference**: Always use `LYNG_AI_SPEC.md` in the project root as the primary source of truth for syntax and idioms.
+- **File Extensions**: Use `.lyng` for all script files.
+- **Implicit Coroutines**: Remember that all Lyng functions are implicitly coroutines; do not look for `async/await`.
+- **Everything is an Expression**: Leverage the fact that blocks, if-statements, and loops return values.
+- **Maps vs Blocks**: Be careful: `{}` is a block/lambda, use `Map()` for an empty map.

AGENTS.md

@@ -0,0 +1,22 @@
+# AI Agent Notes
+
+## Kotlin/Wasm generation guardrails
+- Avoid creating suspend lambdas for compiler runtime statements. Prefer explicit `object : Statement()` with `override suspend fun execute(...)`.
+- Do not use `statement { ... }` or other inline suspend lambdas in compiler hot paths (e.g., parsing/var declarations, initializer thunks).
+- If you need a wrapper for delegated properties, check for `getValue` explicitly and return a concrete `Statement` object when missing; avoid `onNotFoundResult` lambdas.
+- If wasmJs browser tests hang, first run `:lynglib:wasmJsNodeTest` and look for wasm compilation errors; hangs usually mean module instantiation failed.
+- Do not increase test timeouts to mask wasm generation errors; fix the invalid IR instead.
+
+## Type inference notes (notes/new_lyng_type_system_spec.md)
+- Nullability is Kotlin-style: `T` non-null, `T?` nullable, `!!` asserts non-null.
+- `void` is a singleton of class `Void` (syntax sugar for return type).
+- Object members are always allowed even on unknown types; non-Object members require explicit casts. Remove `inspect` from Object and use `toInspectString()` instead.
+- Type expression checks: `x is T` is value instance check; `T1 is T2` is type-subset; `A in T` means `A` is subset of `T`; `==` is structural type equality.
+- Type aliases: `type Name = TypeExpr` (generic allowed) expand to their underlying type expressions; no nominal distinctness.
+- Do not reintroduce bytecode fallback opcodes (e.g., `GET_NAME`, `EVAL_*`, `CALL_FALLBACK`) or runtime name-resolution fallbacks; all symbol resolution must stay compile-time only.
+
+## Bytecode frame-first migration plan
+- Treat frame slots as the only storage for locals/temps by default; avoid pre-creating scope slot mappings for compiled functions.
+- Create closure references only when a capture is detected; use a direct frame+slot reference (foreign slot ref) instead of scope slots.
+- Keep Scope as a lazy reflection facade: resolve name -> slot only on demand for Kotlin interop (no eager name mapping on every call).
+- Avoid PUSH_SCOPE/POP_SCOPE in bytecode for loops/functions unless dynamic name access or Kotlin reflection is requested.

CHANGELOG.md

@@ -1,6 +1,62 @@
-## Changelog
+## 1.5.0-SNAPSHOT
 
-### Unreleased
+### Language Features
+- Added `return` statement with local and non-local exit support (`return@label`).
+- Support for `abstract` classes, methods, and variables.
+- Introduced `interface` as a synonym for `abstract class`.
+- Multiple Inheritance (MI) completed and enabled by default (C3 MRO).
+- Class properties with custom accessors (`get`, `set`).
+- Restricted setter visibility (`private set`, `protected set`).
+- Late-initialized `val` fields in classes with `Unset` protection.
+- Named arguments (`name: value`) and named splats (`...Map`).
+- Assign-if-null operator `?=`.
+- Refined `protected` visibility rules and `closed` modifier.
+- Transient attribute `@Transient` for serialization and equality.
+- Unified Delegation model for `val`, `var`, and `fun`.
+- Singleton objects (`object`) and object expressions.
+
+### Standard Library
+- Added `with(self, block)` for scoped execution.
+- Added `clamp()` function and extension.
+- Improved `Exception` and `StackTraceEntry` reporting.
+
+### Tooling and IDE
+- **CLI**: Added `fmt` as a first-class subcommand for code formatting.
+- **IDEA Plugin**: Lightweight autocompletion (experimental), improved docs, and Grazie integration.
+- **Highlighters**: Updated TextMate bundle and website highlighters for new syntax.
+
+### Detailed Changes:
+
+- Language: Refined `protected` visibility rules
+  - Ancestor classes can now access `protected` members of their descendants, provided the ancestor also defines or inherits a member with the same name (indicating an override of a member known to the ancestor).
+  - This allows patterns where a base class calls a `protected` method that is implemented in a subclass.
+  - Fixed a regression where self-calls to unmangled members sometimes bypassed visibility checks incorrectly; these are now handled by the refined logic.
+
+- Language: Added `return` statement
+  - `return [expression]` exits the innermost enclosing callable (function or lambda).
+  - Supports non-local returns using `@label` syntax (e.g., `return@outer 42`).
+  - Named functions automatically provide their name as a label for non-local returns.
+  - Labeled lambdas: lambdas can be explicitly labeled using `@label { ... }`.
+  - Restriction: `return` is forbidden in shorthand function definitions (e.g., `fun f(x) = return x` is a syntax error).
+  - Control Flow: `return` and `break` are now protected from being caught by user-defined `try-catch` blocks in Lyng.
+  - Documentation: New `docs/return_statement.md` and updated `tutorial.md`.
+
+- Language: stdlib improvements
+  - Added `with(self, block)` function to `root.lyng` which executes a block with `this` set to the provided object.
+- Language: Abstract Classes and Interfaces
+  - Support for `abstract` modifier on classes, methods, and variables.
+  - Introduced `interface` as a synonym for `abstract class`, supporting full state (constructors, fields, `init` blocks) and implementation by parts via MI.
+  - New `closed` modifier (antonym to `open`) to prevent overriding class members.
+  - Refined `override` logic: mandatory keyword when re-declaring members that exist in the ancestor chain (MRO).
+  - MI Satisfaction: Abstract requirements are automatically satisfied by matching concrete members found later in the C3 MRO chain without requiring explicit proxy methods.
+  - Integration: Updated highlighters (lynglib, lyngweb, IDEA plugin), IDEA completion, and Grazie grammar checking.
+  - Documentation: Updated `docs/OOP.md` with sections on "Abstract Classes and Members", "Interfaces", and "Overriding and Virtual Dispatch".
+- IDEA plugin: Improved natural language support and spellchecking
+  - Disabled the limited built-in English and Technical dictionaries.
+  - Enforced usage of the platform's standard Natural Languages (Grazie) and Spellchecker components.
+  - Integrated `SpellCheckerManager` for word suggestions and validation, respecting users' personal and project dictionaries.
+  - Added project-specific "learned words" support via `Lyng Formatter` settings and quick-fixes.
+  - Enhanced fallback spellchecker for technical terms and Lyng-specific vocabulary.
 
 - Language: Class properties with accessors
   - Support for `val` (read-only) and `var` (read-write) properties in classes.
@@ -70,7 +126,7 @@
     - Header-specified constructor arguments are passed to direct bases.
   - Visibility enforcement under MI:
     - `private` visible only inside the declaring class body.
-    - `protected` visible inside the declaring class and any of its transitive subclasses; unrelated contexts cannot access it (qualification/casts do not bypass).
+    - `protected` visible inside the declaring class and its transitive subclasses. Additionally, ancestor classes can access protected members of their descendants if it's an override of a member known to the ancestor. Unrelated contexts cannot access it (qualification/casts do not bypass).
   - Diagnostics improvements:
     - Missing member/field messages include receiver class and linearization order; hints for `this@Type` or casts when helpful.
     - Invalid `this@Type` reports that the qualifier is not an ancestor and shows the receiver lineage.
@@ -78,16 +134,6 @@
 
 - Documentation updated (docs/OOP.md and tutorial quick-start) to reflect MI with active C3 MRO.
 
-Notes:
-- Existing single-inheritance code continues to work; resolution reduces to the single base.
-- If code previously relied on non-deterministic parent set iteration, C3 MRO provides a predictable order; disambiguate explicitly if needed using `this@Type`/casts.
-
-# Changelog
-
-All notable changes to this project will be documented in this file.
-
-## Unreleased
-
 - CLI: Added `fmt` as a first-class Clikt subcommand.
   - Default behavior: formats files to stdout (no in-place edits by default).
   - Options:
@@ -100,6 +146,7 @@ All notable changes to this project will be documented in this file.
   - `lyng --help` shows `fmt`; `lyng fmt --help` displays dedicated help.
   - Fix: Property accessors (`get`, `set`, `private set`, `protected set`) are now correctly indented relative to the property declaration.
   - Fix: Indentation now correctly carries over into blocks that start on extra‑indented lines (e.g., nested `if` statements or property accessor bodies).
+  - Fix: Formatting Markdown files no longer deletes content in `.lyng` code fences and works correctly with injected files (resolves clobbering, `StringIndexOutOfBoundsException`, and `nonempty text is not covered by block` errors).
 
 - CLI: Preserved legacy script invocation fast-paths:
   - `lyng script.lyng [args...]` executes the script directly.

LYNG_AI_SPEC.md

@@ -0,0 +1,116 @@
+# Lyng Language AI Specification (V1.5.0-SNAPSHOT)
+
+High-density specification for LLMs. Reference this for all Lyng code generation.
+
+## 1. Core Philosophy & Syntax
+- **Everything is an Expression**: Blocks, `if`, `when`, `for`, `while`, `do-while` return their last expression (or `void`).
+- **Loops with `else`**: `for`, `while`, and `do-while` support an optional `else` block.
+    - `else` executes **only if** the loop finishes normally (without a `break`).
+    - `break <value>` exits the loop and sets its return value.
+    - Loop Return Value:
+        1. Value from `break <value>`.
+        2. Result of `else` block (if loop finished normally and `else` exists).
+        3. Result of the last iteration (if loop finished normally and no `else`).
+        4. `void` (if loop body never executed and no `else`).
+- **Implicit Coroutines**: All functions are coroutines. No `async/await`. Use `launch { ... }` (returns `Deferred`) or `flow { ... }`.
+- **Variables**: `val` (read-only), `var` (mutable). Supports late-init `val` in classes (must be assigned in `init` or body).
+- **Serialization**: Use `@Transient` attribute before `val`/`var` or constructor parameters to exclude them from Lynon/JSON serialization. Transient fields are also ignored during `==` structural equality checks.
+- **Null Safety**: `?` (nullable type), `?.` (safe access), `?( )` (safe invoke), `?{ }` (safe block invoke), `?[ ]` (safe index), `?:` or `??` (elvis), `?=` (assign-if-null).
+- **Equality**: `==` (equals), `!=` (not equals), `===` (ref identity), `!==` (ref not identity).
+- **Comparison**: `<`, `>`, `<=`, `>=`, `<=>` (shuttle/spaceship, returns -1, 0, 1).
+- **Destructuring**: `val [a, b, rest...] = list`. Supports nested `[a, [b, c]]` and splats.
+- **Compile-Time Resolution Only**: All names/members must resolve at compile time. No runtime name lookup or fallback opcodes.
+
+## 2. Object-Oriented Programming (OOP)
+- **Multiple Inheritance**: Supported with **C3 MRO** (Python-style). Diamond-safe.
+- **Header Arguments**: `class Foo(a, b) : Base(a)` defines fields `a`, `b` and passes `a` to `Base`.
+- **Members**: `fun name(args) { ... }`, `val`, `var`, `static val`, `static fun`.
+- **Properties (Get/Set)**: Pure accessors, no auto-backing fields.
+    ```lyng
+    var age
+        get() = _age
+        private set(v) { if(v >= 0) _age = v }
+    // Laconic syntax:
+    val area get = π * r * r
+    ```
+- **Mandatory `override`**: Required for all members existing in the ancestor chain.
+- **Visibility**: `public` (default), `protected` (subclasses and ancestors for overrides), `private` (this class instance only). `private set` / `protected set` allowed on properties.
+- **Disambiguation**: `this@Base.member()` or `(obj as Base).member()`. `as` returns a qualified view.
+- **Abstract/Interface**: `interface` is a synonym for `abstract class`. Both support state and constructors.
+- **Extensions**: `fun Class.ext()` or `val Class.ext get = ...`. Scope-isolated.
+- **Member Access**: Object members (`toString`, `toInspectString`, `let`, `also`, `apply`, `run`) are allowed on unknown types; all other members require a statically known receiver type or explicit cast.
+
+## 2.1 Type System (2026)
+- **Root Type**: Everything is an `Object` (root of the hierarchy).
+- **Nullability**: Non-null by default (`T`), nullable with `T?`, `!!` asserts non-null.
+- **Untyped params**: `fun foo(x)` -> `x: Object`, `fun foo(x?)` -> `x: Object?`.
+- **Untyped vars**: `var x` is `Unset` until first assignment locks the type.
+- **Inference**: List/map literals infer union element types; empty list is `List<Object>`, empty map is `{:}`.
+- **Generics**: Bounds with `T: A & B` or `T: A | B`; variance uses `out`/`in`.
+
+## 3. Delegation (`by`)
+Unified model for `val`, `var`, and `fun`.
+```lyng
+val x by MyDelegate()
+var y by Map() // Uses "y" as key in map
+fn f(a, b) by RemoteProxy() // Calls Proxy.invoke(thisRef, "f", a, b)
+```
+Delegate Methods:
+- `getValue(thisRef, name)`: for `val`/`var`.
+- `setValue(thisRef, name, val)`: for `var`.
+- `invoke(thisRef, name, args...)`: for `fn` (called if `getValue` is absent).
+- `bind(name, access, thisRef)`: optional hook called at declaration/binding time. `access` is `DelegateAccess.Val`, `Var`, or `Callable`.
+
+## 4. Standard Library & Functional Built-ins
+- **Scope Functions**:
+    - `obj.let { it... }`: result of block. `it` is `obj`.
+    - `obj.apply { this... }`: returns `obj`. `this` is `obj`.
+    - `obj.also { it... }`: returns `obj`. `it` is `obj`.
+    - `obj.run { this... }`: result of block. `this` is `obj`.
+    - `with(obj, { ... })`: result of block. `this` is `obj`.
+- **Functional**: `forEach`, `map`, `filter`, `any`, `all`, `sum`, `count`, `sortedBy`, `flatten`, `flatMap`, `associateBy`.
+- **Lazy**: `val x = cached { expensive() }` (call as `x()`) or `val x by lazy { ... }`.
+- **Collections**: `List` ( `[a, b]` ), `Map` ( `Map(k => v)` ), `Set` ( `Set(a, b)` ). `MapEntry` ( `k => v` ).
+
+## 5. Patterns & Shorthands
+- **Map Literals**: `{ key: value, identifier: }` (identifier shorthand `x:` is `x: x`). Empty map is `{:}`.
+- **Named Arguments**: `fun(y: 10, x: 5)`. Shorthand: `Point(x:, y:)`.
+- **Varargs & Splats**: `fun f(args...)`, `f(...otherList)`.
+- **Labels**: `loop@ for(x in list) { if(x == 0) break@loop }`.
+- **Dynamic**: `val d = dynamic { get { name -> ... } }` allows `d.anyName` via explicit dynamic handler (not implicit fallback).
+
+## 6. Operators & Methods to Overload
+| Op | Method | Op | Method |
+| :--- | :--- | :--- | :--- |
+| `+` | `plus` | `==` | `equals` |
+| `-` | `minus` | `<=>` | `compareTo` |
+| `*` | `mul` | `[]` | `getAt` / `putAt` |
+| `/` | `div` | `!` | `logicalNot` |
+| `%` | `mod` | `-` | `negate` (unary) |
+| `=~` | `operatorMatch` | `+=` | `plusAssign` |
+
+## 7. Common Snippets
+```lyng
+// Multiple Inheritance and Properties
+class Warrior(id, hp) : Character(id), HealthPool(hp) {
+    override fun toString() = "Warrior #%s (%s HP)"(id, hp)
+}
+
+// Map entry and merging
+val m = Map("a" => 1) + ("b" => 2)
+m += "c" => 3
+
+// Destructuring with splat
+val [first, middle..., last] = [1, 2, 3, 4, 5]
+
+// Safe Navigation and Elvis
+val companyName = person?.job?.company?.name ?: "Freelancer"
+```
+
+## 8. Standard Library Discovery
+To collect data on the standard library and available APIs, AI should inspect:
+- **Global Symbols**: `lynglib/src/commonMain/kotlin/net/sergeych/lyng/Script.kt` (root functions like `println`, `sqrt`, `assert`).
+- **Core Type Members**: `lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/*.kt` (e.g., `ObjList.kt`, `ObjString.kt`, `ObjMap.kt`) for methods on built-in types.
+- **Lyng-side Extensions**: `lynglib/stdlib/lyng/root.lyng` for high-level functional APIs (e.g., `map`, `filter`, `any`, `lazy`).
+- **I/O & Processes**: `lyngio/src/commonMain/kotlin/net/sergeych/lyng/io/` for `fs` and `process` modules.
+- **Documentation**: `docs/*.md` (e.g., `tutorial.md`, `lyngio.md`) for high-level usage and module overviews.

README.md

@@ -1,6 +1,14 @@
-# Lyng: modern scripting for kotlin multiplatform
+# Lyng: ideal scripting for kotlin multiplatform
+
+__Please visit the project homepage: [https://lynglang.com](https://lynglang.com) and a [telegram channel](https://t.me/lynglang).__
+
+__Main development site:__ [https://gitea.sergeych.net/SergeychWorks/lyng](https://gitea.sergeych.net/SergeychWorks/lyng)
+__github mirror__: [https://github.com/sergeych/lyng](https://github.com/sergeych/lyng)
+
+We keep github as a mirror and backup for the project, while the main development site is hosted on gitea.sergeych.net. We use gitea for issues and pull requests, and as a main point of trust, as github access now is a thing that can momentarily be revoked for no apparent reason.
+
+We encourage using the github if the main site is not accessible from your country and vice versa. We recommend to `publishToMavenLocal` and not depend on politics.
 
-Please visit the project homepage: [https://lynglang.com](https://lynglang.com) and a [telegram channel](https://t.me/lynglang) for updates.
 
 - simple, compact, intuitive and elegant modern code:
 
@@ -17,37 +25,38 @@ Point(x:, y:).dist() //< 5
 fun swapEnds(first, args..., last, f) {
     f( last, ...args, first)
 } 
+
+class A {
+    class B(x?)
+    object Inner { val foo = "bar" }
+    enum E* { One, Two }
+}
+val ab = A.B()
+assertEquals(ab.x, null)
+assertEquals(A.Inner.foo, "bar")
+assertEquals(A.One, A.E.One)
 ```
 
 - extremely simple Kotlin integration on any platform (JVM, JS, WasmJS, Lunux, MacOS, iOS, Windows)
 - 100% secure: no access to any API you didn't explicitly provide
-- 100% coroutines! Every function/script is a coroutine, it does not block the thread, no async/await/suspend keyword garbage, see [parallelism]
-
-```
-  val deferred = launch {
-    delay(1.5) // coroutine is delayed for 1.5s, thread is not blocked!
-    "done"
-  }
-  // ...
-  // suspend current coroutine, no thread is blocked again,
-  // and wait for deferred to return something:
-  assertEquals("donw", deferred.await())
-```
-and it is multithreaded on platforms supporting it (automatically, no code changes required, just
-`launch` more coroutines and they will be executed concurrently if possible). See [parallelism]
-
-- functional style and OOP together, multiple inheritance, implementing interfaces for existing classes, writing extensions.
+- 100% coroutines! Every function/script is a coroutine, it does not block the thread, no async/await/suspend keyword garbage, see [parallelism]. it is multithreaded on platforms supporting it (automatically, no code changes required, just `launch` more coroutines and they will be executed concurrently if possible). See [parallelism]
+- functional style and OOP together: multiple inheritance (so you got it all - mixins, interfaces, etc.), delegation, sigletons, anonymous classes,extensions.
+- nice literals for maps and arrays, destructuring assignment, ranges.
 - Any Unicode letters can be used as identifiers: `assert( sin(π/2) == 1 )`.
 
  ## Resources: 
 
 - [Language home](https://lynglang.com)
 - [introduction and tutorial](docs/tutorial.md) - start here please
+- [What's New in 1.5](docs/whats_new_1_5.md)
 - [Testing and Assertions](docs/Testing.md)
+- [Filesystem and Processes (lyngio)](docs/lyngio.md)
+- [Return Statement](docs/return_statement.md)
 - [Efficient Iterables in Kotlin Interop](docs/EfficientIterables.md)
 - [Samples directory](docs/samples)
 - [Formatter (core + CLI + IDE)](docs/formatter.md)
 - [Books directory](docs)
+- [AI agent guidance](AGENTS.md)
 
 ## Integration in Kotlin multiplatform
 
@@ -55,7 +64,7 @@ and it is multithreaded on platforms supporting it (automatically, no code chang
 
 ```kotlin
 // update to current please:
-val lyngVersion = "0.6.1-SNAPSHOT"
+val lyngVersion = "1.5.0-SNAPSHOT"
 
 repositories {
     // ...
@@ -79,7 +88,7 @@ Now you can import lyng and use it:
 ### Execute script:
 
 ```kotlin
-import net.sergeyh.lyng.*
+import net.sergeych.lyng.*
 
 // we need a coroutine to start, as Lyng
 // is a coroutine based language, async topdown
@@ -95,9 +104,7 @@ Script is executed over some `Scope`. Create instance,
 add your specific vars and functions to it, and call:
 
 ```kotlin
-
-import com.sun.source.tree.Scope
-import new.sergeych.lyng.*
+import net.sergeych.lyng.*
 
 // simple function
 val scope = Script.newScope().apply {
@@ -145,6 +152,12 @@ Tips:
 - After a dot, globals are intentionally suppressed (e.g., `lines().Path` is not valid), only the receiver’s members are suggested.
 - If completion seems sparse, make sure related modules are imported (e.g., `import lyng.io.fs` so that `Path` and its methods are known).
 
+## AI Assistant Support
+
+To help AI assistants (like Cursor, Windsurf, or GitHub Copilot) understand Lyng with minimal effort, we provide a high-density language specification:
+
+- **[LYNG_AI_SPEC.md](LYNG_AI_SPEC.md)**: A concise guide for AI models to learn Lyng syntax, idioms, and core philosophy. We recommend pointing your AI tool to this file or including it in your project's custom instructions.
+
 ## Why? 
 
 Designed to add scripting to kotlin multiplatform application in easy and efficient way. This is attempt to achieve what Lua is for C/++.
@@ -164,7 +177,7 @@ Designed to add scripting to kotlin multiplatform application in easy and effici
 
 # Language Roadmap
 
-We are now at **v1.0**: basic optimization performed, battery included: standard library is 90% here, initial
+We are now at **v1.5.0-SNAPSHOT** (stable development cycle): basic optimization performed, battery included: standard library is 90% here, initial
 support in HTML, popular editors, and IDEA; tools to syntax highlight and format code are ready. It was released closed to schedule.
 
 Ready features:
@@ -176,6 +189,7 @@ Ready features:
 - [x] ranges, lists, strings, interfaces: Iterable, Iterator, Collection, Array
 - [x] when(value), if-then-else
 - [x] exception handling: throw, try-catch-finally, exception classes.
+- [x] user-defined exception classes
 - [x] multiplatform maven publication
 - [x] documentation for the current state
 - [x] maps, sets and sequences (flows?)
@@ -191,8 +205,19 @@ Ready features:
 - [x] regular exceptions + extended `when`
 - [x] multiple inheritance for user classes
 - [x] class properties (accessors)
+- [x] `return` statement for local and non-local exit
+- [x] Unified Delegation model: val, var and fun
+- [x] `lazy val` using delegation
+- [x] singletons `object TheOnly { ... }`
+- [x] object expressions `object: List { ... }`
+- [x] late-init vals in classes
+- [x] properties with getters and setters
+- [x] assign-if-null operator `?=`
+- [x] user-defined exception classes
 
-## plan: towards v1.5 Enhancing
+All of this is documented in the [language site](https://lynglang.com) and locally [docs/language.md](docs/tutorial.md). the current nightly builds published on the site and in the private maven repository.  
+
+## plan: towards v2.0 Next Generation
 
 - [x] site with integrated interpreter to give a try
 - [x] kotlin part public API good docs, integration focused

archived/README.md

@@ -0,0 +1,4 @@
+# Obsolete files
+
+
+__Do not rely on contents of the files in this directory. They are kept for historical reference only and may not be up-to-date or relevant.__

archived/proposals/delegates.lyng

@@ -0,0 +1,117 @@
+/*
+    This is a tech proposal under construction, please do not use it yet
+    for any purpose
+*/
+
+/*
+    Abstract delegate can be used to proxy read/wrtie field access
+    or method call. Default implementation reports error.
+*/
+interface Delegate {
+    fun getValue() = Unset
+    fun setValue(newValue) { throw NotImplementedException("delegate setter is not implemented") }
+    fun invoke(args...) { throw NotImplementedException("delegate setter is not implemented") }
+}
+
+/*
+    Delegate cam be used to implement a val, var or fun, so there are
+    access type enum to distinguish:
+*/
+enum DelegateAccess {
+    Val,
+    Var,
+    Callable
+}
+
+// Delegate can be associated by a val/var/fun in a declaraion site using `by` keyword
+
+val proxiedVal by proxy(1)
+var proxiedVar by proxy(2, 3)
+fun proxiedFun by proxy()
+
+// each proxy is a Lyng expression returning instance of the Proxy interface:
+
+/*
+    Proxy interface is connecting some named property of a given kind with the `Delegate`.
+    It removes the burden of dealing with property name and this ref on each get/set value
+    or invoke allowing having one delegate per instance, execution buff.
+*/
+interface Proxy {
+    fun getDelegate(propertyName: String,access: DelegateAccess,thisRef: Obj?): Delegate
+}
+
+// val, var and fun can be delegated, local or class instance:
+class TestProxy: Proxy {
+    override getDelegate(name,access,thisRef) {
+        Delegate()
+    }
+}
+
+val proxy = TestProxy()
+
+class Allowed {
+    val v1 by proxy
+    var v2 by proxy
+    fun f1 by proxy
+}
+val v3 by proxy
+var v4 by proxy
+fun f2 by proxy
+
+/*
+    It means that for example
+    Allowed().f1("foo")
+    would call a delegate.invoke("foo") on the `Delegate` instance supplied by `proxy`, etc.
+*/
+
+// The practic sample: lazy value
+
+/*
+    The delegate that caches single time evaluated value
+*/
+class LazyDelegate(creator): Delegate {
+    private var currentValue=Unset
+
+    override fun getValue() {
+        if( currentValue == Unset )
+            currentValue = creator()
+        currentValue
+    }
+}
+
+/*
+    The proxy to assign it
+*/
+class LazyProxy(creator) {
+    fun getDelegate(name,access,thisRef) {
+        if( access != DelegateAccess.Val )
+            throw IllegalArgumentException("only lazy val are allowed")
+        LazyDelegate(creator)
+    }
+}
+
+
+/*
+    A helper function to simplify creation:
+*/
+fun lazy(creator) {
+    LazyProxy(creator)
+}
+
+// Usage sample and the test:
+var callCounter = 0
+assertEquals(0, clallCounter)
+
+val lazyText by lazy { "evaluated text" }
+
+// the lazy property is not yet evaluated:
+assertEquals(0, clallCounter)
+// now evaluate it by using it:
+assertEquals("evaluated text", lazyText)
+assertEquals(1, callCounter)
+
+// lazy delegate should fail on vars or funs:
+assertThrows { var bad by lazy { "should not happen" } }
+assertThrows { fun bad by lazy { 42 } }
+
+

bin/deploy_all

@@ -0,0 +1,40 @@
+#!/bin/bash
+
+#
+# Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+#
+
+set -e
+echo "publishing all artifacts"
+echo
+./gradlew publishToMavenLocal
+./gradlew publish
+
+echo
+echo "Creating plugin"
+echo
+./gradlew buildInstallablePlugin
+
+echo
+echo "building CLI tools"
+echo
+bin/local_jrelease
+bin/local_release
+
+echo
+echo "Deploying site"
+echo
+./bin/deploy_site

bin/deploy_plugin

@@ -0,0 +1,26 @@
+#!/bin/sh
+
+#
+# Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+#
+
+set -e
+
+echo
+echo "Creating plugin"
+echo
+./gradlew buildInstallablePlugin
+deploy_site -u

bin/deploy_site

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 #
-# Copyright 2025 Sergey S. Chernov real.sergeych@gmail.com
+# Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -17,6 +17,14 @@
 #
 #
 
+upload_only=false
+for arg in "$@"; do
+  if [[ "$arg" == "-u" || "$arg" == "--upload-only" ]]; then
+    upload_only=true
+    break
+  fi
+done
+
 function checkState() {
   if [[ $? != 0 ]]; then
     echo
@@ -24,9 +32,10 @@ function checkState() {
     echo
     exit 100
   fi
-
 }
 
+
+
 # Update docs/idea_plugin.md to point to the latest built IDEA plugin zip
 # from ./distributables before building the site. The change is temporary and
 # the original file is restored right after the build.
@@ -107,28 +116,28 @@ function refreshTextmateZip() {
   (cd editors && zip -rq ../distributables/lyng-textmate.zip .)
 }
 
-# Update the IDEA plugin download link in docs (temporarily), then build, then restore the doc
-refreshTextmateZip
-updateIdeaPluginDownloadLink || echo "WARN: proceeding without updating IDEA plugin download link"
 
-./gradlew site:jsBrowserDistribution
-BUILD_RC=$?
+if [[ "$upload_only" == false ]]; then
+  # Update the IDEA plugin download link in docs (temporarily), then build, then restore the doc
+  refreshTextmateZip
+  updateIdeaPluginDownloadLink || echo "WARN: proceeding without updating IDEA plugin download link"
 
-# Always restore original doc if backup exists
-if [[ -f "$DOC_IDEA_PLUGIN_BACKUP" ]]; then
+  ./gradlew site:jsBrowserDistribution
+  BUILD_RC=$?
+
+  # Always restore original doc if backup exists
+  if [[ -f "$DOC_IDEA_PLUGIN_BACKUP" ]]; then
     mv -f "$DOC_IDEA_PLUGIN_BACKUP" "$DOC_IDEA_PLUGIN"
-fi
+  fi
 
-if [[ $BUILD_RC -ne 0 ]]; then
+  if [[ $BUILD_RC -ne 0 ]]; then
     echo
     echo -- build failed. deploy aborted.
     echo
     exit 100
+  fi
 fi
 
-
-#exit 0
-
 # Prepare working dir
 ssh -p ${SSH_PORT} ${SSH_HOST} "
   cd ${ROOT}
@@ -143,12 +152,15 @@ ssh -p ${SSH_PORT} ${SSH_HOST} "
   fi
 ";
 
-# sync files
-SRC=./site/build/dist/js/productionExecutable
-rsync -e "ssh -p ${SSH_PORT}" -avz -r -d --delete ${SRC}/* ${SSH_HOST}:${ROOT}/build/dist
-checkState
-#rsync -e "ssh -p ${SSH_PORT}" -avz  ./static/* ${SSH_HOST}:${ROOT}/build/dist
-#checkState
+if [[ "$upload_only" == false ]]; then
+  # sync files
+  SRC=./site/build/dist/js/productionExecutable
+  rsync -e "ssh -p ${SSH_PORT}" -avz -r -d --delete ${SRC}/* ${SSH_HOST}:${ROOT}/build/dist
+  checkState
+  #rsync -e "ssh -p ${SSH_PORT}" -avz  ./static/* ${SSH_HOST}:${ROOT}/build/dist
+  #checkState
+fi
+
 rsync -e "ssh -p ${SSH_PORT}" -avz -r -d --delete distributables/* ${SSH_HOST}:${ROOT}/build/dist/distributables
 checkState
 

bytecode_migration_plan.md

@@ -0,0 +1,7 @@
+# Bytecode Migration Plan (Archived)
+
+Status: completed.
+
+Historical reference:
+- `notes/archive/bytecode_migration_plan.md` (full plan)
+- `notes/archive/bytecode_migration_plan_completed.md` (summary)

docs/Buffer.md

@@ -23,11 +23,11 @@ There are a lo of ways to construct a buffer:
     assertEquals( 5, Buffer("hello").size )
 
     // from bytes, e.g. integers in range 0..255
-    assertEquals( 255, Buffer(1,2,3,255).last() )
+    assertEquals( 255, Buffer(1,2,3,255).last )
 
     // from whatever iterable that produces bytes, e.g.
     // integers in 0..255 range:
-    assertEquals( 129, Buffer([1,2,129]).last() )
+    assertEquals( 129, Buffer([1,2,129]).last )
 
     // Empty buffer of fixed size:
     assertEquals(100, Buffer(100).size)

docs/BytecodeSpec.md

@@ -0,0 +1,280 @@
+# Lyng Bytecode VM Spec v0 (Draft)
+
+This document describes a register-like (3-address) bytecode for Lyng with
+dynamic slot width (8/16/32-bit slot IDs), a slot-tail argument model, and
+typed lanes for Obj/Int/Real/Bool. The VM is intended to run as a suspendable
+interpreter and fall back to the existing AST execution when needed.
+
+## 1) Frame & Slot Model
+
+### Frame metadata
+- localCount: number of local slots for this function (fixed at compile time).
+- argCount: number of arguments passed at call time.
+- scopeSlotNames: optional debug names for scope slots (locals/params), aligned to slot mapping.
+- argBase = localCount.
+
+### Slot layout
+slots[0 .. localCount-1]              locals
+slots[localCount .. localCount+argCount-1]  arguments
+
+### Typed lanes
+- slotType[]: UNKNOWN/OBJ/INT/REAL/BOOL
+- objSlots[], intSlots[], realSlots[], boolSlots[]
+- A slot is a logical index; active lane is selected by slotType.
+
+### Parameter access
+- param i => slot localCount + i
+- variadic extra => slot localCount + declaredParamCount + k
+
+### Debug metadata (optional)
+- scopeSlotNames: array sized scopeSlotCount, each entry nullable.
+- Intended for disassembly/debug tooling; VM semantics do not depend on it.
+
+### Constant pool extras
+- SlotPlan: map of name -> slot index, used by PUSH_SCOPE to pre-allocate and map loop locals.
+- CallArgsPlan: ordered argument specs (name/splat) + tailBlock flag, used when argCount has the plan flag set.
+
+## 2) Slot ID Width
+
+Per frame, select:
+- 8-bit if localCount + argCount < 256
+- 16-bit if < 65536
+- 32-bit otherwise
+
+The decoder uses a dedicated loop per width. All slot operands are expanded to
+Int internally.
+
+## 3) CALL Semantics (Model A)
+
+Instruction:
+CALL_DIRECT fnId, argBase, argCount, dst
+
+Behavior:
+- Allocate a callee frame sized localCount + argCount.
+- Copy caller slots [argBase .. argBase+argCount-1] into callee slots
+  [localCount .. localCount+argCount-1].
+- Callee returns via RET slot or RET_VOID.
+- Caller stores return value to dst.
+
+Other calls:
+- CALL_VIRTUAL recvSlot, methodId, argBase, argCount, dst
+- CALL_FALLBACK stmtId, argBase, argCount, dst
+- CALL_SLOT calleeSlot, argBase, argCount, dst
+
+## 4) Binary Encoding Layout
+
+All instructions are:
+  [opcode:U8] [operands...]
+
+Operand widths:
+- slotId: S = 1/2/4 bytes (per frame slot width)
+- constId: K = 2 bytes (U16), extend to 4 if needed
+- ip: I = 2 bytes (U16) or 4 bytes (U32) per function size
+- fnId/methodId/stmtId: F/M/T = 2 bytes (U16) unless extended
+- argCount: C = 2 bytes (U16), extend to 4 if needed
+
+Endianness: little-endian for multi-byte operands.
+
+Common operand patterns:
+- S: one slot
+- SS: two slots
+- SSS: three slots
+- K S: constId + dst slot
+- S I: slot + jump target
+- I: jump target
+- F S C S: fnId, argBase slot, argCount, dst slot
+
+Arg count flag:
+- If high bit of C is set (0x8000), the low 15 bits encode a CallArgsPlan constId.
+- When not set, C is the raw positional count and tailBlockMode=false.
+
+## 5) Opcode Table
+
+Note: Any opcode can be compiled to FALLBACK if not implemented in a VM pass.
+
+### Data movement
+- NOP
+- MOVE_OBJ S -> S
+- MOVE_INT S -> S
+- MOVE_REAL S -> S
+- MOVE_BOOL S -> S
+- BOX_OBJ S -> S
+- CONST_OBJ K -> S
+- CONST_INT K -> S
+- CONST_REAL K -> S
+- CONST_BOOL K -> S
+- CONST_NULL -> S
+
+### Numeric conversions
+- INT_TO_REAL S -> S
+- REAL_TO_INT S -> S
+- BOOL_TO_INT S -> S
+- INT_TO_BOOL S -> S
+
+### Arithmetic: INT
+- ADD_INT S, S -> S
+- SUB_INT S, S -> S
+- MUL_INT S, S -> S
+- DIV_INT S, S -> S
+- MOD_INT S, S -> S
+- NEG_INT S -> S
+- INC_INT S
+- DEC_INT S
+
+### Arithmetic: REAL
+- ADD_REAL S, S -> S
+- SUB_REAL S, S -> S
+- MUL_REAL S, S -> S
+- DIV_REAL S, S -> S
+- NEG_REAL S -> S
+
+### Arithmetic: OBJ
+- ADD_OBJ S, S -> S
+- SUB_OBJ S, S -> S
+- MUL_OBJ S, S -> S
+- DIV_OBJ S, S -> S
+- MOD_OBJ S, S -> S
+
+### Bitwise: INT
+- AND_INT S, S -> S
+- OR_INT S, S -> S
+- XOR_INT S, S -> S
+- SHL_INT S, S -> S
+- SHR_INT S, S -> S
+- USHR_INT S, S -> S
+- INV_INT S -> S
+
+### Comparisons (typed)
+- CMP_EQ_INT S, S -> S
+- CMP_NEQ_INT S, S -> S
+- CMP_LT_INT S, S -> S
+- CMP_LTE_INT S, S -> S
+- CMP_GT_INT S, S -> S
+- CMP_GTE_INT S, S -> S
+- CMP_EQ_REAL S, S -> S
+- CMP_NEQ_REAL S, S -> S
+- CMP_LT_REAL S, S -> S
+- CMP_LTE_REAL S, S -> S
+- CMP_GT_REAL S, S -> S
+- CMP_GTE_REAL S, S -> S
+- CMP_EQ_BOOL S, S -> S
+- CMP_NEQ_BOOL S, S -> S
+
+### Mixed numeric comparisons
+- CMP_EQ_INT_REAL S, S -> S
+- CMP_EQ_REAL_INT S, S -> S
+- CMP_LT_INT_REAL S, S -> S
+- CMP_LT_REAL_INT S, S -> S
+- CMP_LTE_INT_REAL S, S -> S
+- CMP_LTE_REAL_INT S, S -> S
+- CMP_GT_INT_REAL S, S -> S
+- CMP_GT_REAL_INT S, S -> S
+- CMP_GTE_INT_REAL S, S -> S
+- CMP_GTE_REAL_INT S, S -> S
+- CMP_NEQ_INT_REAL S, S -> S
+- CMP_NEQ_REAL_INT S, S -> S
+- CMP_EQ_OBJ S, S -> S
+- CMP_NEQ_OBJ S, S -> S
+- CMP_REF_EQ_OBJ S, S -> S
+- CMP_REF_NEQ_OBJ S, S -> S
+- CMP_LT_OBJ S, S -> S
+- CMP_LTE_OBJ S, S -> S
+- CMP_GT_OBJ S, S -> S
+- CMP_GTE_OBJ S, S -> S
+
+### Boolean ops
+- NOT_BOOL S -> S
+- AND_BOOL S, S -> S
+- OR_BOOL S, S -> S
+
+### Control flow
+- JMP I
+- JMP_IF_TRUE S, I
+- JMP_IF_FALSE S, I
+- RET S
+- RET_VOID
+- PUSH_SCOPE K
+- POP_SCOPE
+
+### Scope setup
+- PUSH_SCOPE uses const `SlotPlan` (name -> slot index) to create a child scope and apply slot mapping.
+- POP_SCOPE restores the parent scope.
+
+### Calls
+- CALL_DIRECT F, S, C, S
+- CALL_VIRTUAL S, M, S, C, S
+- CALL_FALLBACK T, S, C, S
+- CALL_SLOT S, S, C, S
+
+### Object access (optional, later)
+- GET_FIELD S, M -> S
+- SET_FIELD S, M, S
+- GET_INDEX S, S -> S
+- SET_INDEX S, S, S
+
+### Fallback
+- EVAL_FALLBACK T -> S
+
+## 6) Const Pool Encoding (v0)
+
+Each const entry is encoded as:
+  [tag:U8] [payload...]
+
+Tags:
+- 0x00: NULL
+- 0x01: BOOL (payload: U8 0/1)
+- 0x02: INT (payload: S64, little-endian)
+- 0x03: REAL (payload: F64, IEEE-754, little-endian)
+- 0x04: STRING (payload: U32 length + UTF-8 bytes)
+- 0x05: OBJ_REF (payload: U32 index into external Obj table)
+
+Notes:
+- OBJ_REF is reserved for embedding prebuilt Obj handles if needed.
+- Strings use UTF-8; length is bytes, not chars.
+
+## 7) Function Header (binary container)
+
+Suggested layout for a bytecode function blob:
+- magic: U32 ("LYBC")
+- version: U16 (0x0001)
+- slotWidth: U8 (1,2,4)
+- ipWidth: U8 (2,4)
+- constIdWidth: U8 (2,4)
+- localCount: U32
+- codeSize: U32 (bytes)
+- constCount: U32
+- constPool: [const entries...]
+- code: [bytecode...]
+
+Const pool entries use the encoding described in section 6.
+
+## 8) Sample Bytecode (illustrative)
+
+Example Lyng:
+  val x = 2
+  val y = 3
+  val z = x + y
+
+Assume:
+- localCount = 3 (x,y,z)
+- argCount = 0
+- slot width = 1 byte
+- const pool: [INT 2, INT 3]
+
+Bytecode:
+  CONST_INT k0 -> s0
+  CONST_INT k1 -> s1
+  ADD_INT s0, s1 -> s2
+  RET_VOID
+
+Encoded (opcode values symbolic):
+  [OP_CONST_INT][k0][s0]
+  [OP_CONST_INT][k1][s1]
+  [OP_ADD_INT][s0][s1][s2]
+  [OP_RET_VOID]
+
+## 9) Notes
+
+- Mixed-mode is allowed: compiler can emit FALLBACK ops for unsupported nodes.
+- The VM must be suspendable; on suspension, store ip + minimal operand state.
+- Source mapping uses a separate ip->Pos table, not part of core bytecode.

docs/OOP.md

@@ -42,15 +42,129 @@ a _constructor_ that requires two parameters for fields. So when creating it wit
 Form now on `Point` is a class, it's type is `Class`, and we can create instances with it as in the
 example above.
 
+## Singleton Objects
+
+Singleton objects are declared using the `object` keyword. An `object` declaration defines both a class and a single instance of that class at the same time. This is perfect for stateless utilities, global configuration, or shared delegates.
+
+```lyng
+object Config {
+    val version = "1.0.0"
+    val debug = true
+    
+    fun printInfo() {
+        println("App version: " + version)
+    }
+}
+
+// Usage:
+println(Config.version)
+Config.printInfo()
+```
+
+Objects can also inherit from classes or interfaces:
+
+```lyng
+object DefaultLogger : Logger("Default") {
+    override fun log(msg) {
+        println("[DEFAULT] " + msg)
+    }
+}
+```
+
+## Object Expressions
+
+Object expressions allow you to create an instance of an anonymous class. This is useful when you need to provide a one-off implementation of an interface or inherit from a class without declaring a new named subclass.
+
+```lyng
+val worker = object : Runnable {
+    override fun run() {
+        println("Working...")
+    }
+}
+```
+
+Object expressions can implement multiple interfaces and inherit from one class:
+
+```lyng
+val x = object : Base(arg1), Interface1, Interface2 {
+    val property = 42
+    override fun method() = property * 2
+}
+```
+
+### Scoping and `this@object`
+
+Object expressions capture their lexical scope, meaning they can access local variables and members of the outer class. When `this` is rebound (for example, inside an `apply` block), you can use the reserved alias `this@object` to refer to the innermost anonymous object instance.
+
+```lyng
+val handler = object {
+    fun process() {
+        this@object.apply {
+            // here 'this' is rebound to the map/context
+            // but we can still access the anonymous object via this@object
+            println("Processing in " + this@object)
+        }
+    }
+}
+```
+
+### Serialization and Identity
+
+- **Serialization**: Anonymous objects are **not serializable**. Attempting to encode an anonymous object via `Lynon` will throw a `SerializationException`. This is because their class definition is transient and cannot be safely restored in a different session or process.
+- **Type Identity**: Every object expression creates a unique anonymous class. Two identical object expressions will result in two different classes with distinct type identities.
+
+## Nested Declarations
+
+Lyng allows classes, objects, enums, and type aliases to be declared inside another class. These declarations live in the **class namespace** (not the instance), so they do not capture an outer instance and are accessed with a qualifier.
+
+```lyng
+class A {
+    class B(x?)
+    object Inner { val foo = "bar" }
+    type Alias = B
+    enum E { One, Two }
+}
+
+val ab = A.B()
+assertEquals(ab.x, null)
+assertEquals(A.Inner.foo, "bar")
+```
+
+Rules:
+- **Qualified access**: use `Outer.Inner` for nested classes/objects/enums/aliases. Inside `Outer` you can refer to them by unqualified name unless shadowed.
+- **No inner semantics**: nested declarations do not capture an instance of the outer class. They are resolved at compile time.
+- **Visibility**: `private` restricts a nested declaration to the declaring class body (not visible from outside or subclasses).
+- **Reflection name**: a nested class reports `Outer.Inner` (e.g., `A.B::class.name` is `"A.B"`).
+- **Type aliases**: behave as aliases of the qualified nested type and are expanded by the type system.
+
+### Lifted Enum Entries
+
+Enums can optionally lift their entries into the surrounding class namespace using `*`:
+
+```lyng
+class A {
+    enum E* { One, Two }
+}
+
+assertEquals(A.One, A.E.One)
+assertEquals(A.Two, A.E.Two)
+```
+
+Notes:
+- `E*` exposes entries in `A` as if they were direct members (`A.One`).
+- If a name would conflict with an existing class member, compilation fails (no implicit fallback).
+- Without `*`, use the normal `A.E.One` form.
+
 ## Properties
 
 Properties allow you to define member accessors that look like fields but execute code when read or written. Unlike regular fields, properties in Lyng do **not** have automatic backing fields; they are pure accessors.
 
 ### Basic Syntax
 
-Properties are declared using `val` (read-only) or `var` (read-write) followed by a name and `get()`/`set()` blocks:
+Properties are declared using `val` (read-only) or `var` (read-write) followed by a name and a `get` (and optionally `set`) accessor. Unlike fields, properties do not have automatic storage and must compute their values or delegate to other members.
 
-```kotlin
+The standard syntax uses parentheses:
+```lyng
 class Person(private var _age: Int) {
     // Read-only property
     val ageCategory 
@@ -65,21 +179,17 @@ class Person(private var _age: Int) {
             if (value >= 0) _age = value
         }
 }
-
-val p = Person(15)
-assertEquals("Minor", p.ageCategory)
-p.age = 20
-assertEquals("Adult", p.ageCategory)
 ```
 
-### Laconic Expression Shorthand
+### Laconic Syntax (Optional Parentheses)
 
-For simple accessors and methods, you can use the `=` shorthand for a more elegant and laconic form:
+For even cleaner code, you can omit the parentheses for `get` and `set`. This is especially useful for simple expression shorthand:
 
-```kotlin
+```lyng
 class Circle(val radius: Real) {
-    val area get() = π * radius * radius
-    val circumference get() = 2 * π * radius
+    // Laconic expression shorthand
+    val area get = π * radius * radius
+    val circumference get = 2 * π * radius
     
     fun diameter() = radius * 2
 }
@@ -88,15 +198,16 @@ fun median(a, b) = (a + b) / 2
 
 class Counter {
     private var _count = 0
-    var count get() = _count set(v) = _count = v
+    var count get = _count set(v) = _count = v
 }
 ```
 
 ### Key Rules
 
-- **`val` properties** must have a `get()` accessor and cannot have a `set()`.
-- **`var` properties** must have both `get()` and `set()` accessors.
+- **`val` properties** must have a `get` accessor (with or without parentheses) and cannot have a `set`.
+- **`var` properties** must have both `get` and `set` accessors.
 - **Functions and methods** can use the `=` shorthand to return the result of a single expression.
+- **`override` is mandatory**: If you are overriding a member from a base class, you MUST use the `override` keyword.
 - **No Backing Fields**: There is no magic `field` identifier. If you need to store state, you must declare a separate (usually `private`) field.
 - **Type Inference**: You can omit the type declaration if it can be inferred or if you don't need strict typing.
 
@@ -104,7 +215,7 @@ class Counter {
 
 When you want to define a property that is computed only once (on demand) and then remembered, use the built-in `cached` function. This is more efficient than a regular property with `get()` if the computation is expensive, as it avoids re-calculating the value on every access.
 
-```kotlin
+```lyng
 class DataService(val id: Int) {
     // The lambda passed to cached is only executed once, the first time data() is called.
     val data = cached {
@@ -122,6 +233,52 @@ println(service.data()) // Returns "Record 42" immediately (no second fetch)
 
 Note that `cached` returns a lambda, so you access the value by calling it like a method: `service.data()`. This is a powerful pattern for lazy-loading resources, caching results of database queries, or delaying expensive computations until they are truly needed.
 
+## Delegation
+
+Delegation allows you to hand over the logic of a property or function to another object. This is done using the `by` keyword.
+
+### Property Delegation
+
+Instead of providing `get()` and `set()` accessors, you can delegate them to an object that implements the `getValue` and `setValue` methods.
+
+```lyng
+class User {
+    var name by MyDelegate()
+}
+```
+
+### Function Delegation
+
+You can also delegate a whole function to an object. When the function is called, it will invoke the delegate's `invoke` method.
+
+```lyng
+fun remoteAction by RemoteProxy("actionName")
+```
+
+### The Unified Delegate Interface
+
+A delegate is any object that provides the following methods (all optional depending on usage):
+
+- `getValue(thisRef, name)`: Called when a delegated `val` or `var` is read.
+- `setValue(thisRef, name, newValue)`: Called when a delegated `var` is written.
+- `invoke(thisRef, name, args...)`: Called when a delegated `fun` is invoked.
+- `bind(name, access, thisRef)`: Called once during initialization to configure or validate the delegate.
+
+### Map as a Delegate
+
+Maps can also be used as delegates. When delegated to a property, the map uses the property name as the key:
+
+```lyng
+val settings = { "theme": "dark", "fontSize": 14 }
+val theme by settings
+var fontSize by settings
+
+println(theme)    // "dark"
+fontSize = 16     // Updates settings["fontSize"]
+```
+
+For more details and advanced patterns (like `lazy`, `observable`, and shared stateless delegates), see the [Delegation Guide](delegation.md).
+
 ## Instance initialization: init block
 
 In addition to the primary constructor arguments, you can provide an `init` block that runs on each instance creation. This is useful for more complex initializations, side effects, or setting up fields that depend on multiple constructor parameters.
@@ -179,7 +336,7 @@ Note that unlike **Kotlin**, which uses `=` for named arguments, Lyng uses `:` t
 
 You can declare a `val` field without an immediate initializer if you provide an assignment for it within an `init` block or the class body. This is useful when the initial value depends on logic that cannot be expressed in a single expression.
 
-```kotlin
+```lyng
 class DataProcessor(data: Object) {
     val result: Object
     
@@ -200,7 +357,7 @@ Key rules for late-init `val`:
 
 The `Unset` singleton represents a field that has been declared but not yet initialized. While it can be compared and converted to a string, most other operations on it are forbidden to prevent accidental use of uninitialized data.
 
-```kotlin
+```lyng
 class T {
     val x
     fun check() {
@@ -237,7 +394,7 @@ Functions defined inside a class body are methods, and unless declared
 
 Lyng supports declaring a class with multiple direct base classes. The syntax is:
 
-```
+```lyng
 class Foo(val a) {
     var tag = "F"
     fun runA() { "ResultA:" + a }
@@ -286,16 +443,16 @@ Key rules and features:
 
 - Syntax
   - `class Derived(args) : Base1(b1Args), Base2(b2Args)`
-  - Each direct base may receive constructor arguments specified in the header. Only direct bases receive header args; indirect bases must either be default‑constructible or receive their args through their direct child (future extensions may add more control).
+  - Each direct base may receive constructor arguments specified in the header. Only direct bases receive header args; indirect bases must either be default‑constructible or receive their args through their direct child.
 
-- Resolution order (C3 MRO — active)
+- Resolution order (C3 MRO)
   - Member lookup is deterministic and follows C3 linearization (Python‑like), which provides a monotonic, predictable order for complex hierarchies and diamonds.
   - Intuition: for `class D() : B(), C()` where `B()` and `C()` both derive from `A()`, the C3 order is `D → B → C → A`.
   - The first visible match along this order wins.
 
 - Qualified dispatch
   - Inside a class body, use `this@Type.member(...)` to start lookup at the specified ancestor.
-  - For arbitrary receivers, use casts: `(expr as Type).member(...)` or `(expr as? Type)?.member(...)` (safe‑call `?.` is already available in Lyng).
+  - For arbitrary receivers, use casts: `(expr as Type).member(...)` or `(expr as? Type)?.member(...)`.
   - Qualified access does not relax visibility.
 
 - Field inheritance (`val`/`var`) and collisions
@@ -310,12 +467,215 @@ Key rules and features:
 
 - Visibility
   - `private`: accessible only inside the declaring class body; not visible in subclasses and cannot be accessed via `this@Type` or casts.
-  - `protected`: accessible in the declaring class and in any of its transitive subclasses (including MI), but not from unrelated contexts; qualification/casts do not bypass it.
+  - `protected`: accessible in the declaring class and in any of its transitive subclasses (including MI). Additionally, ancestor classes can access protected members of their descendants if it's an override of a member known to the ancestor. Protected members are not visible from unrelated contexts; qualification/casts do not bypass it.
 
-- Diagnostics
-  - When a member/field is not found, error messages include the receiver class name and the considered linearization order, with suggestions to disambiguate using `this@Type` or casts if appropriate.
-  - Qualifying with a non‑ancestor in `this@Type` reports a clear error mentioning the receiver lineage.
-  - `as`/`as?` cast errors mention the actual and target types.
+## Abstract Classes and Members
+
+An `abstract` class is a class that cannot be instantiated and is intended to be inherited by other classes. It can contain `abstract` members that have no implementation and must be implemented by concrete subclasses.
+
+### Abstract Classes
+
+To declare an abstract class, use the `abstract` modifier:
+
+```lyng
+abstract class Shape {
+    abstract fun area(): Real
+}
+```
+
+Abstract classes can have constructors, fields, and concrete methods, just like regular classes.
+
+### Abstract Members
+
+Methods and variables (`val`/`var`) can be marked as `abstract`. Abstract members must not have a body or initializer.
+
+```lyng
+abstract class Base {
+    abstract fun foo(): Int
+    abstract var bar: String
+}
+```
+
+- **Safety**: `abstract` members cannot be `private`, as they must be visible to subclasses for implementation.
+- **Contract of Capability**: An `abstract val/var` represents a requirement for a capability. It can be implemented by either a **field** (storage) or a **property** (logic) in a subclass.
+
+## Interfaces
+
+An `interface` in Lyng is a synonym for an `abstract class`. Following the principle that Lyng's Multiple Inheritance system is powerful enough to handle stateful contracts, interfaces support everything classes do, including constructors, fields, and `init` blocks.
+
+```lyng
+interface Named(val name: String) {
+    fun greet() { "Hello, " + name }
+}
+
+class Person(name) : Named(name)
+```
+
+Using `interface` instead of `abstract class` is a matter of semantic intent, signaling that the class is primarily intended to be used as a contract in MI.
+
+### Implementation by Parts
+
+One of the most powerful benefits of Lyng's Multiple Inheritance and C3 MRO is the ability to satisfy an interface's requirements "by parts" from different parent classes. Since an `interface` can have state and requirements, a subclass can inherit these requirements and satisfy them using members inherited from other parents in the MRO chain.
+
+Example:
+
+```lyng
+// Interface with state (id) and abstract requirements
+interface Character(val id) {
+    var health
+    var mana
+    
+    fun isAlive() = health > 0
+    fun status() = name + " (#" + id + "): " + health + " HP, " + mana + " MP"
+}
+
+// Parent class 1: provides health
+class HealthPool(var health)
+
+// Parent class 2: provides mana and name
+class ManaPool(var mana) {
+    val name = "Hero"
+}
+
+// Composite class: implements Character by combining HealthPool and ManaPool
+class Warrior(id, h, m) : HealthPool(h), ManaPool(m), Character(id)
+
+val w = Warrior(1, 100, 50)
+assertEquals("Hero (#1): 100 HP, 50 MP", w.status())
+```
+
+In this example, `Warrior` inherits from `HealthPool`, `ManaPool`, and `Character`. The abstract requirements `health` and `mana` from `Character` are automatically satisfied by the matching members inherited from `HealthPool` and `ManaPool`. The `status()` method also successfully finds the `name` field from `ManaPool`. This pattern allows for highly modular and reusable "trait-like" classes that can be combined to fulfill complex contracts without boilerplate proxy methods.
+
+## Overriding and Virtual Dispatch
+
+When a class defines a member that already exists in one of its parents, it is called **overriding**.
+
+### The `override` Keyword
+
+In Lyng, the `override` keyword is **mandatory when declaring a member** that exists in the ancestor chain (MRO).
+
+```lyng
+class Parent {
+    fun foo() = 1
+}
+
+class Child : Parent() {
+    override fun foo() = 2 // Mandatory override keyword
+}
+```
+
+- **Implicit Satisfaction**: If a class inherits an abstract requirement and a matching implementation from different parents, the requirement is satisfied automatically without needing an explicit `override` proxy.
+- **No Accidental Overrides**: If you define a member that happens to match a parent's member but you didn't use `override`, the compiler will throw an error. This prevents the "Fragile Base Class" problem.
+- **Private Members**: Private members in parent classes are NOT part of the virtual interface and cannot be overridden. Defining a member with the same name in a subclass is allowed without `override` and is treated as a new, independent member.
+
+### Visibility Widening
+
+A subclass can increase the visibility of an overridden member (e.g., `protected` → `public`), but it is strictly forbidden from narrowing it (e.g., `public` → `protected`).
+
+### The `closed` Modifier
+
+To prevent a member from being overridden in subclasses, use the `closed` modifier (equivalent to `final` in other languages).
+
+```lyng
+class Critical {
+    closed fun secureStep() { ... }
+}
+```
+
+Attempting to override a `closed` member results in a compile-time error.
+
+## Operator Overloading
+
+Lyng allows you to overload standard operators by defining specific named methods in your classes. When an operator expression is evaluated, Lyng delegates the operation to these methods if they are available.
+
+### Binary Operators
+
+To overload a binary operator, define the corresponding method that takes one argument:
+
+| Operator | Method Name |
+| :--- | :--- |
+| `a + b` | `plus(other)` |
+| `a - b` | `minus(other)` |
+| `a * b` | `mul(other)` |
+| `a / b` | `div(other)` |
+| `a % b` | `mod(other)` |
+| `a && b` | `logicalAnd(other)` |
+| `a \|\| b` | `logicalOr(other)` |
+| `a =~ b` | `operatorMatch(other)` |
+| `a & b` | `bitAnd(other)` |
+| `a \| b` | `bitOr(other)` |
+| `a ^ b` | `bitXor(other)` |
+| `a << b` | `shl(other)` |
+| `a >> b` | `shr(other)` |
+
+Example:
+```lyng
+class Vector(val x, val y) {
+    fun plus(other) = Vector(x + other.x, y + other.y)
+    override fun toString() = "Vector(${x}, ${y})"
+}
+
+val v1 = Vector(1, 2)
+val v2 = Vector(3, 4)
+assertEquals(Vector(4, 6), v1 + v2)
+```
+
+### Unary Operators
+
+Unary operators are overloaded by defining methods with no arguments:
+
+| Operator | Method Name |
+| :--- | :--- |
+| `-a` | `negate()` |
+| `!a` | `logicalNot()` |
+| `~a` | `bitNot()` |
+
+### Assignment Operators
+
+Assignment operators like `+=` first attempt to call a specific assignment method. If that method is not defined, they fall back to a combination of the binary operator and a regular assignment (e.g., `a = a + b`).
+
+| Operator | Method Name | Fallback |
+| :--- | :--- | :--- |
+| `a += b` | `plusAssign(other)` | `a = a + b` |
+| `a -= b` | `minusAssign(other)` | `a = a - b` |
+| `a *= b` | `mulAssign(other)` | `a = a * b` |
+| `a /= b` | `divAssign(other)` | `a = a / b` |
+| `a %= b` | `modAssign(other)` | `a = a % b` |
+
+Example of in-place mutation:
+```lyng
+class Counter(var value) {
+    fun plusAssign(n) {
+        value = value + n
+    }
+}
+
+val c = Counter(10)
+c += 5
+assertEquals(15, c.value)
+```
+
+### Comparison Operators
+
+Comparison operators use `compareTo` and `equals`.
+
+| Operator | Method Name |
+| :--- | :--- |
+| `a == b`, `a != b` | `equals(other)` |
+| `<`, `>`, `<=`, `>=`, `<=>` | `compareTo(other)` |
+
+- `compareTo` should return:
+  - `0` if `a == b`
+  - A negative integer if `a < b`
+  - A positive integer if `a > b`
+- The `<=>` (shuttle) operator returns the result of `compareTo` directly.
+- `equals` returns a `Bool`. If `equals` is not explicitly defined, Lyng falls back to `compareTo(other) == 0`.
+
+> **Note**: Methods that are already defined in the base `Obj` class (like `equals`, `toString`, or `contains`) require the `override` keyword when redefined in your class or as an extension. Other operator methods (like `plus` or `negate`) do not require `override` unless they are already present in your class's hierarchy.
+
+### Increment and Decrement
+
+`++` and `--` operators are implemented using `plus(1)` or `minus(1)` combined with an assignment back to the variable. If the variable is a field or local variable, it will be updated with the result of the operation.
 
 Compatibility notes:
 
@@ -400,6 +760,23 @@ Notes and limitations (current version):
 - `name` and `ordinal` are read‑only properties of an entry.
 - `entries` is a read‑only list owned by the enum type.
 
+## Exception Classes
+
+You can define your own exception classes by inheriting from the built-in `Exception` class. User-defined exceptions are regular classes and can have their own properties and methods.
+
+```lyng
+class MyError(val code, m) : Exception(m)
+
+try {
+    throw MyError(500, "Internal Server Error")
+}
+catch(e: MyError) {
+    println("Error " + e.code + ": " + e.message)
+}
+```
+
+For more details on error handling, see the [Exceptions Handling Guide](exceptions_handling.md).
+
 ## fields and visibility
 
 It is possible to add non-constructor fields:
@@ -438,7 +815,7 @@ You can restrict the visibility of a `var` field's or property's setter by using
 
 #### On Fields
 
-```kotlin
+```lyng
 class SecretCounter {
     var count = 0
         private set // Can be read anywhere, but written only in SecretCounter
@@ -448,7 +825,7 @@ class SecretCounter {
 
 val c = SecretCounter()
 println(c.count) // OK
-c.count = 10     // Throws AccessException
+c.count = 10     // Throws IllegalAccessException
 c.increment()    // OK
 ```
 
@@ -456,7 +833,7 @@ c.increment()    // OK
 
 You can also apply restricted visibility to custom property setters:
 
-```kotlin
+```lyng
 class Person(private var _age: Int) {
     var age
         get() = _age
@@ -468,7 +845,7 @@ class Person(private var _age: Int) {
 
 A `protected set` allows subclasses to modify a field that is otherwise read-only to the public:
 
-```kotlin
+```lyng
 class Base {
     var state = "initial"
         protected set
@@ -484,7 +861,7 @@ val d = Derived()
 println(d.state) // OK: "initial"
 d.changeState("updated")
 println(d.state) // OK: "updated"
-d.state = "bad"  // Throws AccessException: public write not allowed
+d.state = "bad"  // Throws IllegalAccessException: public write not allowed
 ```
 
 ### Key Rules and Limitations
@@ -522,23 +899,44 @@ Private fields are visible only _inside the class instance_:
     void
     >>> void
 
+### Transient fields
+
+You can mark a field or a constructor parameter as transient using the `@Transient` attribute. Transient members are ignored during serialization (Lynon and JSON) and are also excluded from structural equality (`==`) checks.
+
+```lyng
+class Session(@Transient val token, val userId) {
+    @Transient var lastAccess = time.now()
+    var data = Map()
+}
+```
+
+For more details on how transient fields behave during restoration, see the [Serialization Guide](serialization.md).
+
 ### Protected members
 
-Protected members are available to the declaring class and all of its transitive subclasses (including via MI), but not from unrelated contexts:
+Protected members are available to the declaring class and all of its transitive subclasses (including via MI). Additionally, an ancestor class can access a `protected` member of its descendant if the ancestor also defines or inherits a member with the same name (i.e., it is an override of something the ancestor knows about). 
 
-```
-class A() {
-    protected fun ping() { "pong" }
-}
-class B() : A() {
-    fun call() { this@A.ping() }
+Protected members are not available from unrelated contexts:
+
+```lyng
+class Base {
+    abstract protected fun foo()
+    
+    fun bar() {
+        // Ancestor can see foo() because it's an override 
+        // of a member it defines (even as abstract):
+        foo()
+    }
 }
 
-val b = B()
-assertEquals("pong", b.call())
+class Derived : Base {
+    override protected fun foo() { "ok" }
+}
+
+assertEquals("ok", Derived().bar())
 
 // Unrelated access is forbidden, even via cast
-assertThrows { (b as A).ping() }
+assertThrows { (Derived() as Base).foo() }
 ```
 
 It is possible to provide private constructor parameters so they can be
@@ -651,7 +1049,7 @@ Just like methods, you can extend existing classes with properties. These can be
 
 A read-only extension can be defined by assigning an expression:
 
-```kotlin
+```lyng
 val String.isLong = length > 10
 
 val s = "Hello, world!"
@@ -662,7 +1060,7 @@ assert(s.isLong)
 
 For more complex logic, use `get()` and `set()` blocks:
 
-```kotlin
+```lyng
 class Box(var value: Int)
 
 var Box.doubledValue
@@ -685,7 +1083,7 @@ Extensions in Lyng are **scope-isolated**. This means an extension is only visib
 
 You can define different extensions with the same name in different scopes:
 
-```kotlin
+```lyng
 fun scopeA() {
     val Int.description = "Number: " + toString()
     assertEquals("Number: 42", 42.description)
@@ -822,12 +1220,12 @@ request](https://gitea.sergeych.net/SergeychWorks/lyng/issues).
 - ObjClass sole parent is Obj
 - ObjClass contains code for instance methods, class fields, hierarchy information.
 - Class information is also scoped. 
-- We acoid imported classes duplication using packages and import caching, so the same imported module is the same object in all its classes.
+- We avoid imported classes duplication using packages and import caching, so the same imported module is the same object in all its classes.
 
 ## Instances
 
 Result of executing of any expression or statement in the Lyng is the object that
-inherits `Obj`, but is not `Obj`. For example it could be Int, void, null, real, string, bool, etc.
+inherits `Obj`, but is not `Obj`. For example, it could be Int, void, null, real, string, bool, etc.
 
 This means whatever expression returns or the variable holds, is the first-class
 object, no differenes. For example:

docs/Range.md

@@ -45,10 +45,11 @@ are equal or within another, taking into account the end-inclusiveness:
     assert( (1..<3) in (1..3) )
     >>> void
 
-## Finite Ranges are iterable
+## Ranges are iterable
 
-So given a range with both ends, you can assume it is [Iterable]. This automatically let
-use finite ranges in loops and convert it to lists:
+Finite ranges are [Iterable] and can be used in loops and list conversions.
+Open-ended ranges are iterable only with an explicit `step`, and open-start
+ranges are never iterable.
 
     assert( [-2, -1, 0, 1] == (-2..1).toList() )
     >>> void
@@ -62,6 +63,8 @@ In spite of this you can use ranges in for loops:
     >>> 3
     >>> void
 
+The loop variable is read-only inside the loop body (behaves like a `val`).
+
 but
 
     for( i in 1..<3 ) 
@@ -70,6 +73,26 @@ but
     >>> 2
     >>> void
 
+### Stepped ranges
+
+Use `step` to change the iteration increment. The range bounds still define membership,
+so iteration ends when the next value is no longer in the range.
+
+    assert( [1,3,5] == (1..5 step 2).toList() )
+    assert( [1,3] == (1..<5 step 2).toList() )
+    assert( ['a','c','e'] == ('a'..'e' step 2).toList() )
+    >>> void
+
+Real ranges require an explicit step:
+
+    assert( [0,0.25,0.5,0.75,1.0] == (0.0..1.0 step 0.25).toList() )
+    >>> void
+
+Open-ended ranges require an explicit step to iterate:
+
+    (0.. step 1).take(3).toList()
+    >>> [0,1,2]
+
 ## Character ranges
 
 You can use Char as both ends of the closed range:
@@ -98,10 +121,12 @@ Exclusive end char ranges are supported too:
 | isEndInclusive  | true for '..'                | Bool          |
 | isOpen          | at any end                   | Bool          |
 | isIntRange      | both start and end are Int   | Bool          |
-| start           |                              | Bool          |
-| end             |                              | Bool          |
+| step            | explicit iteration step      | Any?          |
+| start           |                              | Any?          |
+| end             |                              | Any?          |
 | size            | for finite ranges, see above | Long          |
 | []              | see above                    |               |
-|                 |                              |               |
+
+Ranges are also used with the `clamp(value, range)` function and the `value.clamp(range)` extension method to limit values within boundaries.
 
 [Iterable]: Iterable.md

docs/Real.md

@@ -19,6 +19,7 @@ you can use it's class to ensure type:
 |-----------------|-------------------------------------------------------------|------|
 | `.roundToInt()` | round to nearest int like round(x)                          | Int  |
 | `.toInt()`      | convert integer part of real to `Int` dropping decimal part | Int  |
+| `.clamp(range)` | clamp value within range boundaries                         | Real |
 |                 |                                                             |      |
 |                 |                                                             |      |
 |                 |                                                             |      |

docs/Testing.md

@@ -93,8 +93,6 @@ If we want to evaluate the message lazily:
 
 In this case, formatting will only occur if the condition is not met.
 
-
-
 ### `check`
 
     check(condition, message="check failed")
@@ -107,3 +105,17 @@ With lazy message evaluation:
 
 In this case, formatting will only occur if the condition is not met.
 
+### TODO
+
+It is easy to mark some code and make it throw a special exception at cone with:
+
+    TODO()
+
+or
+
+    TODO("some message")
+
+It raises an `NotImplementedException` with the given message. You can catch it
+as any other exception when necessary.
+
+Many IDE and editors have built-in support for marking code with TODOs.

docs/advanced_topics.md

@@ -105,6 +105,7 @@ arguments list in almost arbitrary ways. For example:
         var result = ""
         for( a in args ) result += a
     }
+    // loop variables are read-only inside the loop body
 
     assertEquals( 
         "4231", 

docs/ai_notes_wasm_generation_bug.md

@@ -0,0 +1,15 @@
+# AI notes: avoid Kotlin/Wasm invalid IR with suspend lambdas
+
+## Do
+- Prefer explicit `object : Statement()` with `override suspend fun execute(...)` when building compiler statements.
+- Keep `Statement` objects non-lambda, especially in compiler hot paths like parsing/var declarations.
+- If you need conditional behavior, return early in `execute` instead of wrapping `parseExpression()` with `statement(...) { ... }`.
+- When wasmJs tests hang in the browser, first check `wasmJsNodeTest` for a compile error; hangs often mean module instantiation failed.
+
+## Don't
+- Do not create suspend lambdas inside `Statement` factories (`statement { ... }`) for wasm targets.
+- Do not "fix" hangs by increasing browser timeouts; it masks invalid wasm generation.
+
+## Debugging tips
+- Look for `$invokeCOROUTINE$` in wasm function names when mapping failures.
+- If node test logs a wasm compile error, the browser hang is likely the same root cause.

docs/delegation.md

@@ -0,0 +1,194 @@
+# Delegation in Lyng
+
+Delegation is a powerful pattern that allows you to outsource the logic of properties (`val`, `var`) and functions (`fun`) to another object. This enables code reuse, separation of concerns, and the implementation of common patterns like lazy initialization, observable properties, and remote procedure calls (RPC) with minimal boilerplate.
+
+## The `by` Keyword
+
+Delegation is triggered using the `by` keyword in a declaration. The expression following `by` is evaluated once when the member is initialized, and the resulting object becomes the **delegate**.
+
+```lyng
+val x by MyDelegate()
+var y by MyDelegate()
+fun f by MyDelegate()
+```
+
+## The Unified Delegate Model
+
+A delegate object can implement any of the following methods to intercept member access. All methods receive the `thisRef` (the instance containing the member) and the `name` of the member.
+
+```lyng
+interface Delegate {
+    // Called when a 'val' or 'var' is read
+    fun getValue(thisRef, name)
+    
+    // Called when a 'var' is assigned
+    fun setValue(thisRef, name, newValue)
+    
+    // Called when a 'fun' is invoked
+    fun invoke(thisRef, name, args...)
+    
+    // Optional: Called once during initialization to "bind" the delegate
+    // Can be used for validation or to return a different delegate instance
+    fun bind(name, access, thisRef) = this
+}
+```
+
+### Delegate Access Types
+
+The `bind` method receives an `access` parameter of type `DelegateAccess`, which can be one of:
+- `DelegateAccess.Val`
+- `DelegateAccess.Var`
+- `DelegateAccess.Callable` (for `fun`)
+
+## Usage Cases and Examples
+
+### 1. Lazy Initialization
+
+The classic `lazy` pattern ensures a value is computed only when first accessed and then cached. In Lyng, `lazy` is implemented as a class that follows this pattern. While classes typically start with an uppercase letter, `lazy` is an exception to make its usage feel like a native language feature.
+
+```lyng
+class lazy(val creator) : Delegate {
+    private var value = Unset
+
+    override fun bind(name, access, thisRef) {
+        if (access != DelegateAccess.Val) throw "lazy delegate can only be used with 'val'"
+        this
+    }
+
+    override fun getValue(thisRef, name) {
+        if (value == Unset) {
+            // calculate value using thisRef as this:
+            value = with(thisRef) creator()
+        }
+        value
+    }
+}
+
+// Usage:
+val expensiveData by lazy {
+    println("Performing expensive computation...")
+    42
+}
+
+println(expensiveData) // Computes and prints 42
+println(expensiveData) // Returns 42 immediately
+```
+
+### 2. Observable Properties
+
+Delegates can be used to react to property changes.
+
+```lyng
+class Observable(initialValue, val onChange) {
+    private var value = initialValue
+
+    fun getValue(thisRef, name) = value
+    
+    fun setValue(thisRef, name, newValue) {
+        val oldValue = value
+        value = newValue
+        onChange(name, oldValue, newValue)
+    }
+}
+
+class User {
+    var name by Observable("Guest") { name, old, new ->
+        println("Property %s changed from %s to %s"(name, old, new))
+    }
+}
+
+val u = User()
+u.name = "Alice" // Prints: Property name changed from Guest to Alice
+```
+
+### 3. Function Delegation (Proxies)
+
+You can delegate an entire function to an object. This is particularly useful for implementing decorators or RPC clients.
+
+```lyng
+object LoggerDelegate {
+    fun invoke(thisRef, name, args...) {
+        println("Calling function: " + name + " with args: " + args)
+        // Logic here...
+        "Result of " + name
+    }
+}
+
+fun remoteAction by LoggerDelegate
+
+println(remoteAction(1, 2, 3))
+// Prints: Calling function: remoteAction with args: [1, 2, 3]
+// Prints: Result of remoteAction
+```
+
+### 4. Stateless Delegates (Shared Singletons)
+
+Because `getValue`, `setValue`, and `invoke` receive `thisRef`, a single object can act as a delegate for multiple properties across many instances without any per-property memory overhead.
+
+```lyng
+object Constant42 {
+    fun getValue(thisRef, name) = 42
+}
+
+class Foo {
+    val a by Constant42
+    val b by Constant42
+}
+
+val f = Foo()
+assertEquals(42, f.a)
+assertEquals(42, f.b)
+```
+
+### 5. Local Delegation
+
+Delegation is not limited to class members; you can also use it for local variables inside functions.
+
+```lyng
+fun test() {
+    val x by LocalProxy(123)
+    println(x)
+}
+```
+
+### 6. Map as a Delegate
+
+Maps can be used as delegates for `val` and `var` properties. When a map is used as a delegate, it uses the property name as a key to read from or write to the map.
+
+```lyng
+val m = { "a": 1, "b": 2 }
+val a by m
+var b by m
+
+println(a) // 1
+println(b) // 2
+
+b = 42
+println(m["b"]) // 42
+```
+
+Because `Map` implements `getValue` and `setValue`, it works seamlessly with any object that needs to store its properties in a map (e.g., when implementing dynamic schemas or JSON-backed objects).
+
+## The `bind` Hook
+
+The `bind(name, access, thisRef)` method is called exactly once when the member is being initialized. It allows the delegate to:
+1.  **Validate usage**: Throw an error if the delegate is used with the wrong member type (e.g., `lazy` on a `var`).
+2.  **Initialize state**: Set up internal state based on the property name or the containing instance.
+3.  **Substitute itself**: Return a different object that will act as the actual delegate.
+
+```lyng
+class ValidatedDelegate() {
+    fun bind(name, access, thisRef) {
+        if (access == DelegateAccess.Var) {
+            throw "This delegate cannot be used with 'var'"
+        }
+        this
+    }
+    
+    fun getValue(thisRef, name) = "Validated"
+}
+```
+
+## Summary
+
+Delegation in Lyng combines the elegance of Kotlin-style properties with the flexibility of dynamic function interception. By unifying `val`, `var`, and `fun` delegation into a single model, Lyng provides a consistent and powerful tool for meta-programming and code reuse.

docs/embedding.md

@@ -103,6 +103,11 @@ scope.addVoidFn("log") {
     println(items.joinToString(" ") { it.toString(this).value })
 }
 
+// When adding a member function to a class, you can use isOverride = true
+// myClass.addFn("toString", isOverride = true) {
+//     ObjString("Custom string representation")
+// }
+
 // Call them from Lyng
 scope.eval("val y = inc(41); log('Answer:', y)")
 ```
@@ -122,6 +127,9 @@ myClass.createField("version", ObjString("1.0.0"), isMutable = false)
 // Add a mutable field with an initial value
 myClass.createField("count", ObjInt(0), isMutable = true)
 
+// If you are overriding a field from a base class, use isOverride = true
+// myClass.createField("someBaseField", ObjInt(42), isOverride = true)
+
 scope.addConst("MyClass", myClass)
 ```
 
@@ -153,6 +161,16 @@ myClass.addProperty(
     }
 )
 
+// You can also create an ObjProperty explicitly
+val explicitProp = ObjProperty(
+    name = "hexValue",
+    getter = statement { ObjString(internalValue.toString(16)) }
+)
+myClass.addProperty("hexValue", prop = explicitProp)
+
+// Use isOverride = true when overriding a property from a base class
+// myClass.addProperty("baseProp", getter = { ... }, isOverride = true)
+
 scope.addConst("MyClass", myClass)
 ```
 
@@ -164,6 +182,77 @@ instance.value = 42
 println(instance.value) // -> 42
 ```
 
+### 6.5) Preferred: bind Kotlin implementations to declared Lyng classes
+
+For extensions and libraries, the **preferred** workflow is Lyng‑first: declare the class and its members in Lyng, then bind the Kotlin implementations using the bridge.
+
+This keeps Lyng semantics (visibility, overrides, type checks) in Lyng, while Kotlin supplies the behavior.
+
+```lyng
+// Lyng side (in a module)
+class Counter {
+    extern var value: Int
+    extern fun inc(by: Int): Int
+}
+```
+
+Note: members must be marked `extern` so the compiler emits the ABI slots that Kotlin bindings attach to. This applies to functions and properties bound via `addFun` / `addVal` / `addVar`.
+
+```kotlin
+// Kotlin side (binding)
+val moduleScope = Script.newScope() // or an existing module scope
+moduleScope.eval("class Counter { extern var value: Int; extern fun inc(by: Int): Int }")
+
+moduleScope.bind("Counter") {
+    addVar(
+        name = "value",
+        get = { _, self -> self.readField(this, "value").value },
+        set = { _, self, v -> self.writeField(this, "value", v) }
+    )
+    addFun("inc") { _, self, args ->
+        val by = args.requiredArg<ObjInt>(0).value
+        val current = self.readField(this, "value").value as ObjInt
+        val next = ObjInt(current.value + by)
+        self.writeField(this, "value", next)
+        next
+    }
+}
+```
+
+Notes:
+
+- Binding must happen **before** the first instance is created.
+- Use [LyngClassBridge] to bind by name/module, or by an already resolved `ObjClass`.
+- Use `ObjInstance.data` / `ObjClass.classData` to attach Kotlin‑side state when needed.
+
+### 6.6) Preferred: Kotlin reflection bridge for call‑by‑name
+
+For Kotlin code that needs dynamic access to Lyng variables, functions, or members, use the bridge resolver.
+It provides explicit, cached handles and predictable lookup rules.
+
+```kotlin
+val scope = Script.newScope()
+scope.eval("""
+    val x = 40
+    fun add(a, b) = a + b
+    class Box { var value = 1 }
+""")
+
+val resolver = scope.resolver()
+
+// Read a top‑level value
+val x = resolver.resolveVal("x").get(scope)
+
+// Call a function by name (cached inside the resolver)
+val sum = (resolver as BridgeCallByName).callByName(scope, "add", Arguments(ObjInt(1), ObjInt(2)))
+
+// Member access
+val box = scope.eval("Box()")
+val valueHandle = resolver.resolveMemberVar(box, "value")
+valueHandle.set(scope, ObjInt(10))
+val value = valueHandle.get(scope)
+```
+
 ### 7) Read variable values back in Kotlin
 
 The simplest approach: evaluate an expression that yields the value and convert it.
@@ -286,6 +375,46 @@ val isolated = net.sergeych.lyng.Scope.new()
 - When registering packages, names must be unique. Register before you compile/evaluate scripts that import them.
 - To debug scope content, `scope.toString()` and `scope.trace()` can help during development.
 
+### 12) Handling and serializing exceptions
+
+When Lyng code throws an exception, it is caught in Kotlin as an `ExecutionError`. This error wraps the actual Lyng `Obj` that was thrown (which could be a built-in `ObjException` or a user-defined `ObjInstance`).
+
+To simplify handling these objects from Kotlin, several extension methods are provided on the `Obj` class. These methods work uniformly regardless of whether the exception is built-in or user-defined.
+
+#### Uniform Exception API
+
+| Method | Description |
+| :--- | :--- |
+| `obj.isLyngException()` | Returns `true` if the object is an instance of `Exception`. |
+| `obj.isInstanceOf("ClassName")` | Returns `true` if the object is an instance of the named Lyng class or its ancestors. |
+| `obj.getLyngExceptionMessage(scope?=null)` | Returns the exception message as a Kotlin `String`. |
+| `obj.getLyngExceptionMessageWithStackTrace(scope?=null)` | Returns a detailed message with a formatted stack trace. |
+| `obj.getLyngExceptionString(scope)` | Returns a formatted string including the class name, message, and primary throw site. |
+| `obj.getLyngExceptionStackTrace(scope)` | Returns the stack trace as an `ObjList` of `StackTraceEntry`. |
+| `obj.getLyngExceptionExtraData(scope)` | Returns the extra data associated with the exception. |
+| `obj.raiseAsExecutionError(scope?=null)` | Rethrows the object as a Kotlin `ExecutionError`. |
+
+#### Example: Serialization and Rethrowing
+
+You can serialize Lyng exception objects using `Lynon` to transmit them across boundaries and then rethrow them.
+
+```kotlin
+try {
+    scope.eval("throw MyUserException(404, \"Not Found\")")
+} catch (e: ExecutionError) {
+    // 1. Serialize the Lyng exception object
+    val encoded: UByteArray = lynonEncodeAny(scope, e.errorObject)
+
+    // ... (transmit 'encoded' byte array) ...
+
+    // 2. Deserialize it back to an Obj in a different context
+    val decoded: Obj = lynonDecodeAny(scope, encoded)
+
+    // 3. Properly rethrow it on the Kotlin side using the uniform API
+    decoded.raiseAsExecutionError(scope)
+}
+```
+
 ---
 
 That’s it. You now have Lyng embedded in your Kotlin app: you can expose your app’s API, evaluate user scripts, and organize your own packages to import from Lyng code.

docs/exceptions_handling.md

@@ -129,14 +129,16 @@ Serializable class that conveys information about the exception. Important membe
 | name              | description                                            |
 |-------------------|--------------------------------------------------------|
 | message           | String message                                           |
-| stackTrace        | lyng stack trace, list of `StackTraceEntry`, see below |
+| stackTrace()      | lyng stack trace, list of `StackTraceEntry`, see below   |
 | printStackTrace() | format and print stack trace using println()             |
 
+> **Note for Kotlin users**: When working with Lyng exceptions from Kotlin, you can use extension methods like `getLyngExceptionMessageWithStackTrace()`. See [Embedding Lyng](embedding.md#12-handling-and-serializing-exceptions) for the full API.
+
 ## StackTraceEntry
 
 A simple structire that stores single entry in Lyng stack, it is created automatically on exception creation:
 
-```kotlin
+```lyng
 class StackTraceEntry(
     val sourceName: String,
     val line: Int,
@@ -150,24 +152,103 @@ class StackTraceEntry(
 
 # Custom error classes
 
-_this functionality is not yet released_
+You can define your own exception classes by inheriting from the built-in `Exception` class. This allows you to create specific error types for your application logic and catch them specifically.
+
+## Defining a custom exception
+
+To define a custom exception, create a class that inherits from `Exception`:
+
+```lyng
+class MyUserException : Exception("something went wrong")
+```
+
+You can also pass the message dynamically:
+
+```lyng
+class MyUserException(m) : Exception(m)
+
+throw MyUserException("custom error message")
+```
+
+If you don't provide a message to the `Exception` constructor, the class name will be used as the default message:
+
+```lyng
+class SimpleException : Exception
+
+val e = SimpleException()
+assertEquals("SimpleException", e.message)
+```
+
+## Throwing and catching custom exceptions
+
+Custom exceptions are thrown using the `throw` keyword and can be caught using `catch` blocks, just like standard exceptions:
+
+```lyng
+class ValidationException(m) : Exception(m)
+
+try {
+    throw ValidationException("Invalid input")
+}
+catch(e: ValidationException) {
+    println("Caught validation error: " + e.message)
+}
+catch(e: Exception) {
+    println("Caught other exception: " + e.message)
+}
+```
+
+Since user exceptions are real classes, inheritance works as expected:
+
+```lyng
+class BaseError : Exception
+class DerivedError : BaseError
+
+try {
+    throw DerivedError()
+}
+catch(e: BaseError) {
+    // This will catch DerivedError as well
+    assert(e is DerivedError)
+}
+```
+
+## Accessing extra data
+
+You can add your own fields to custom exception classes to carry additional information:
+
+```lyng
+class NetworkException(m, val statusCode) : Exception(m)
+
+try {
+    throw NetworkException("Not Found", 404)
+}
+catch(e: NetworkException) {
+    println("Error " + e.statusCode + ": " + e.message)
+}
+```
 
 # Standard exception classes
 
 | class                      | notes                                                 |
 |----------------------------|-------------------------------------------------------|
-| Exception                  | root of al throwable objects                          |
+| Exception                  | root of all throwable objects                         |
 | NullReferenceException     |                                                       |
 | AssertionFailedException   |                                                       | 
 | ClassCastException         |                                                       |
 | IndexOutOfBoundsException  |                                                       |
 | IllegalArgumentException   |                                                       | 
+| IllegalStateException      |                                                       |
+| NoSuchElementException     |                                                       |
 | IllegalAssignmentException | assigning to val, etc.                                |
 | SymbolNotDefinedException  |                                                       |
 | IterationEndException      | attempt to read iterator past end, `hasNext == false` |
-| AccessException            | attempt to access private members or like             |
-| UnknownException           | unexpected kotlin exception caught                    |
-|                            |                                                       |
+| IllegalAccessException     | attempt to access private members or like             |
+| UnknownException           | unexpected internal exception caught                  |
+| NotFoundException          |                                                       |
+| IllegalOperationException  |                                                       |
+| UnsetException             | access to uninitialized late-init val                 |
+| NotImplementedException    | used by `TODO()`                                      |
+| SyntaxError                |                                                       |
 
 
 ### Symbol resolution errors

docs/generics.md

@@ -0,0 +1,128 @@
+# Generics and type expressions
+
+This document covers generics, bounds, unions/intersections, and the rules for type expressions in Lyng.
+
+# Generic parameters
+
+Declare type parameters with `<...>` on functions and classes:
+
+    fun id<T>(x: T): T = x
+    class Box<T>(val value: T)
+
+Type arguments are usually inferred at call sites:
+
+    val b = Box(10)     // Box<Int>
+    val s = id("ok")    // T is String
+
+# Bounds
+
+Use `:` to set bounds. Bounds may be unions (`|`) or intersections (`&`):
+
+    fun sum<T: Int | Real>(x: T, y: T) = x + y
+    class Named<T: Iterable & Comparable>(val data: T)
+
+Bounds are checked at compile time. For union bounds, the argument must fit at least one option. For intersection bounds, it must fit all options.
+
+# Variance
+
+Generic types are invariant by default. You can specify declaration-site variance:
+
+    class Source<out T>(val value: T)
+    class Sink<in T> { fun accept(x: T) { ... } }
+
+`out` makes the type covariant (produced), `in` makes it contravariant (consumed).
+
+# Type aliases
+
+Type aliases name type expressions (including unions/intersections):
+
+    type Num = Int | Real
+    type AB = A & B
+
+Aliases can be generic and can use bounds and defaults:
+
+    type Maybe<T> = T?
+    type IntList<T: Int> = List<T>
+
+Aliases expand to their underlying type expressions. They can be used anywhere a type expression is expected.
+
+# Inference rules
+
+- Literals set obvious types (`1` is `Int`, `1.0` is `Real`, etc.).
+- Empty list literals default to `List<Object>` unless constrained by context.
+- Non-empty list literals infer element type as a union of element types.
+- Map literals infer key and value types; named keys are `String`.
+
+Examples:
+
+    val a = [1, 2, 3]             // List<Int>
+    val b = [1, "two", true]      // List<Int | String | Bool>
+    val c: List<Int> = []         // List<Int>
+
+    val m1 = { "a": 1, "b": 2 }   // Map<String, Int>
+    val m2 = { "a": 1, "b": "x" } // Map<String, Int | String>
+    val m3 = { ...m1, "c": true } // Map<String, Int | Bool>
+
+Map spreads carry key/value types when possible.
+
+Spreads propagate element type when possible:
+
+    val base = [1, 2]
+    val mix = [...base, 3]        // List<Int>
+
+# Type expressions
+
+Type expressions include simple types, generics, unions, and intersections:
+
+    Int
+    List<String>
+    Int | String
+    Iterable & Comparable
+
+These type expressions can appear in casts and `is` checks.
+
+# `is`, `in`, and `==` with type expressions
+
+There are two categories of `is` checks:
+
+1) Value checks: `x is T`
+   - `x` is a value, `T` is a type expression.
+   - This is a runtime instance check.
+
+2) Type checks: `T1 is T2`
+   - both sides are type expressions (class objects or unions/intersections).
+   - This is a *type-subset* check: every value of `T1` must fit in `T2`.
+
+Exact type expression equality uses `==` and is structural (union/intersection order does not matter).
+
+Includes checks use `in` with type expressions:
+
+    A in T
+
+This means `A` is a subset of `T` (the same relation as `A is T`).
+
+Examples (T = A | B):
+
+    T == A            // false
+    T is A            // false
+    A in T            // true
+    B in T            // true
+    T is A | B        // true
+
+# Practical examples
+
+    fun acceptInts<T: Int>(xs: List<T>) { }
+    acceptInts([1, 2, 3])
+    // acceptInts([1, "a"]) -> compile-time error
+
+    fun f<T>(list: List<T>) {
+        assert( T is Int | String | Bool )
+        assert( !(T is Int) )
+        assert( Int in T )
+    }
+    f([1, "two", true])
+
+# Notes
+
+- `T` is reified as a type expression when needed (e.g., union/intersection). When it is a single class, `T` is that class object.
+- Type expression checks are compile-time where possible; runtime checks only happen for `is` on values and explicit casts.

docs/json_and_kotlin_serialization.md

@@ -20,7 +20,18 @@ Simple classes serialization is supported:
     assertEquals( "{\"foo\":1,\"bar\":2}", Point(1,2).toJsonString() )
     >>> void
 
-Note that mutable members are serialized:
+Note that mutable members are serialized by default. You can exclude any member (including constructor parameters) from JSON serialization using the `@Transient` attribute:
+
+    import lyng.serialization
+    
+    class Point2(@Transient val foo, val bar) {
+        @Transient var reason = 42
+        var visible = 100
+    }
+    assertEquals( "{\"bar\":2,\"visible\":100}", Point2(1,2).toJsonString() )
+    >>> void
+
+Note that if you override json serialization:
 
     import lyng.serialization
     

docs/lyng.io.fs.md

@@ -8,7 +8,7 @@ This module provides a uniform, suspend-first filesystem API to Lyng scripts, ba
 
 It exposes a Lyng class `Path` with methods for file and directory operations, including streaming readers for large files.
 
-It is a separate library because access to teh filesystem is a security risk we compensate with a separate API that user must explicitly include to the dependency and allow. Together with `FsAceessPolicy` that is required to `createFs()` which actually adds the filesystem to the scope, the security risk is isolated.
+It is a separate library because access to the filesystem is a security risk we compensate with a separate API that user must explicitly include to the dependency and allow. Together with `FsAccessPolicy` that is required to `createFs()` which actually adds the filesystem to the scope, the security risk is isolated.
 
 Also, it helps keep Lyng core small and focused.
 
@@ -23,7 +23,7 @@ dependencies {
     implementation("net.sergeych:lyngio:0.0.1-SNAPSHOT")
 }
 ```
-Note on maven repository. Lyngio uses ths same maven as Lyng code (`lynglib`) so it is most likely already in your project. If ont, add it to the proper section of your `build.gradle.kts` or settings.gradle.kts:
+Note on maven repository. Lyngio uses the same maven as Lyng code (`lynglib`) so it is most likely already in your project. If not, add it to the proper section of your `build.gradle.kts` or settings.gradle.kts:
 
 ```kotlin
     repositories {
@@ -43,9 +43,13 @@ This brings in:
 
 The filesystem module is not installed automatically. You must explicitly register it in the scope’s `ImportManager` using the installer. You can customize access control via `FsAccessPolicy`.
 
-Kotlin (host) bootstrap example (imports omitted for brevity):
+Kotlin (host) bootstrap example:
 
 ```kotlin
+import net.sergeych.lyng.Scope
+import net.sergeych.lyng.io.fs.createFs
+import net.sergeych.lyngio.fs.security.PermitAllAccessPolicy
+
 val scope: Scope = Scope.new()
 val installed: Boolean = createFs(PermitAllAccessPolicy, scope)
 // installed == true on first registration in this ImportManager, false on repeats

docs/lyng.io.process.md

@@ -0,0 +1,136 @@
+### lyng.io.process — Process execution and control for Lyng scripts
+
+This module provides a way to run external processes and shell commands from Lyng scripts. It is designed to be multiplatform and uses coroutines for non-blocking execution.
+
+> **Note:** `lyngio` is a separate library module. It must be explicitly added as a dependency to your host application and initialized in your Lyng scopes.
+
+---
+
+#### Add the library to your project (Gradle)
+
+If you use this repository as a multi-module project, add a dependency on `:lyngio`:
+
+```kotlin
+dependencies {
+    implementation("net.sergeych:lyngio:0.0.1-SNAPSHOT")
+}
+```
+
+For external projects, ensure you have the appropriate Maven repository configured (see `lyng.io.fs` documentation).
+
+---
+
+#### Install the module into a Lyng Scope
+
+The process module is not installed automatically. You must explicitly register it in the scope’s `ImportManager` using `createProcessModule`. You can customize access control via `ProcessAccessPolicy`.
+
+Kotlin (host) bootstrap example:
+
+```kotlin
+import net.sergeych.lyng.Scope
+import net.sergeych.lyng.Script
+import net.sergeych.lyng.io.process.createProcessModule
+import net.sergeych.lyngio.process.security.PermitAllProcessAccessPolicy
+
+// ... inside a suspend function or runBlocking
+val scope: Scope = Script.newScope()
+createProcessModule(PermitAllProcessAccessPolicy, scope)
+
+// In scripts (or via scope.eval), import the module:
+scope.eval("import lyng.io.process")
+```
+
+---
+
+#### Using from Lyng scripts
+
+```lyng
+import lyng.io.process
+
+// Execute a process with arguments
+val p = Process.execute("ls", ["-l", "/tmp"])
+for (line in p.stdout) {
+    println("OUT: " + line)
+}
+val exitCode = p.waitFor()
+println("Process exited with: " + exitCode)
+
+// Run a shell command
+val sh = Process.shell("echo 'Hello from shell' | wc -w")
+for (line in sh.stdout) {
+    println("Word count: " + line.trim())
+}
+
+// Platform information
+val details = Platform.details()
+println("OS: " + details.name + " " + details.version + " (" + details.arch + ")")
+if (details.kernelVersion != null) {
+    println("Kernel: " + details.kernelVersion)
+}
+
+if (Platform.isSupported()) {
+    println("Processes are supported!")
+}
+```
+
+---
+
+#### API Reference
+
+##### `Process` (static methods)
+- `execute(executable: String, args: List<String>): RunningProcess` — Start an external process.
+- `shell(command: String): RunningProcess` — Run a command through the system shell (e.g., `/bin/sh` or `cmd.exe`).
+
+##### `RunningProcess` (instance methods)
+- `stdout: Flow` — Standard output stream as a Lyng Flow of lines.
+- `stderr: Flow` — Standard error stream as a Lyng Flow of lines.
+- `waitFor(): Int` — Wait for the process to exit and return the exit code.
+- `signal(name: String)` — Send a signal to the process (e.g., `"SIGINT"`, `"SIGTERM"`, `"SIGKILL"`).
+- `destroy()` — Forcefully terminate the process.
+
+##### `Platform` (static methods)
+- `details(): Map` — Get platform details. Returned map keys: `name`, `version`, `arch`, `kernelVersion`.
+- `isSupported(): Bool` — True if process execution is supported on the current platform.
+
+---
+
+#### Security Policy
+
+Process execution is a sensitive operation. `lyngio` uses `ProcessAccessPolicy` to control access to `execute` and `shell` operations.
+
+- `ProcessAccessPolicy` — Interface for custom policies.
+- `PermitAllProcessAccessPolicy` — Allows all operations.
+- `ProcessAccessOp` (sealed) — Operations to check:
+    - `Execute(executable, args)`
+    - `Shell(command)`
+
+Example of a restricted policy in Kotlin:
+
+```kotlin
+import net.sergeych.lyngio.fs.security.AccessDecision
+import net.sergeych.lyngio.fs.security.Decision
+import net.sergeych.lyngio.process.security.ProcessAccessOp
+import net.sergeych.lyngio.process.security.ProcessAccessPolicy
+
+val restrictedPolicy = object : ProcessAccessPolicy {
+    override suspend fun check(op: ProcessAccessOp, ctx: AccessContext): AccessDecision {
+        return when (op) {
+            is ProcessAccessOp.Execute -> {
+                if (op.executable == "ls") AccessDecision(Decision.Allow)
+                else AccessDecision(Decision.Deny, "Only 'ls' is allowed")
+            }
+            is ProcessAccessOp.Shell -> AccessDecision(Decision.Deny, "Shell is forbidden")
+        }
+    }
+}
+createProcessModule(restrictedPolicy, scope)
+```
+
+---
+
+#### Platform Support
+
+- **JVM:** Full support using `ProcessBuilder`.
+- **Native (Linux/macOS):** Support via POSIX.
+- **Windows:** Support planned.
+- **Android/JS/iOS/Wasm:** Currently not supported; `isSupported()` returns `false` and attempts to run processes will throw `UnsupportedOperationException`.

docs/lyngio.md

@@ -0,0 +1,87 @@
+### lyngio — Extended I/O and System Library for Lyng
+
+`lyngio` is a separate library that extends the Lyng core (`lynglib`) with powerful, multiplatform, and secure I/O capabilities.
+
+#### Why a separate module?
+
+1. **Security:** I/O and process execution are sensitive operations. By keeping them in a separate module, we ensure that the Lyng core remains 100% safe by default. You only enable what you explicitly need.
+2. **Footprint:** Not every script needs filesystem or process access. Keeping these as a separate module helps minimize the dependency footprint for small embedded projects.
+3. **Control:** `lyngio` provides fine-grained security policies (`FsAccessPolicy`, `ProcessAccessPolicy`) that allow you to control exactly what a script can do.
+
+#### Included Modules
+
+- **[lyng.io.fs](lyng.io.fs.md):** Async filesystem access. Provides the `Path` class for file/directory operations, streaming, and globbing.
+- **[lyng.io.process](lyng.io.process.md):** External process execution and shell commands. Provides `Process`, `RunningProcess`, and `Platform` information.
+
+---
+
+#### Quick Start: Embedding lyngio
+
+##### 1. Add Dependencies (Gradle)
+
+```kotlin
+repositories {
+    maven("https://gitea.sergeych.net/api/packages/SergeychWorks/maven")
+}
+
+dependencies {
+    // Both are required for full I/O support
+    implementation("net.sergeych:lynglib:0.0.1-SNAPSHOT")
+    implementation("net.sergeych:lyngio:0.0.1-SNAPSHOT")
+}
+```
+
+##### 2. Initialize in Kotlin (JVM or Native)
+
+To use `lyngio` modules in your scripts, you must install them into your Lyng scope and provide a security policy.
+
+```kotlin
+import net.sergeych.lyng.Script
+import net.sergeych.lyng.io.fs.createFs
+import net.sergeych.lyng.io.process.createProcessModule
+import net.sergeych.lyngio.fs.security.PermitAllAccessPolicy
+import net.sergeych.lyngio.process.security.PermitAllProcessAccessPolicy
+
+suspend fun runMyScript() {
+    val scope = Script.newScope()
+    
+    // Install modules with policies
+    createFs(PermitAllAccessPolicy, scope)
+    createProcessModule(PermitAllProcessAccessPolicy, scope)
+    
+    // Now scripts can import them
+    scope.eval("""
+        import lyng.io.fs
+        import lyng.io.process
+        
+        println("Working dir: " + Path(".").readUtf8())
+        println("OS: " + Platform.details().name)
+    """)
+}
+```
+
+---
+
+#### Security Tools
+
+`lyngio` is built with a "Secure by Default" philosophy. Every I/O or process operation is checked against a policy.
+
+- **Filesystem Security:** Implement `FsAccessPolicy` to restrict access to specific paths or operations (e.g., read-only access to a sandbox directory).
+- **Process Security:** Implement `ProcessAccessPolicy` to restrict which executables can be run or to disable shell execution entirely.
+
+For more details, see the specific module documentation:
+- [Filesystem Security Details](lyng.io.fs.md#access-policy-security)
+- [Process Security Details](lyng.io.process.md#security-policy)
+
+---
+
+#### Platform Support Overview
+
+| Platform | lyng.io.fs | lyng.io.process |
+| :--- | :---: | :---: |
+| **JVM** | ✅ | ✅ |
+| **Native (Linux/macOS)** | ✅ | ✅ |
+| **Native (Windows)** | ✅ | 🚧 (Planned) |
+| **Android** | ✅ | ❌ |
+| **NodeJS** | ✅ | ❌ |
+| **Browser / Wasm** | ✅ (In-memory) | ❌ |

docs/math.md

@@ -92,6 +92,7 @@ or transformed `Real` otherwise.
 | pow(x, y) | ${x^y}$                                              |
 | sqrt(x)   | $ \sqrt {x}$                                         |
 | abs(x)    | absolute value of x. Int if x is Int, Real otherwise |
+| clamp(x, range) | limit x to be inside range boundaries          |
 
 For example:
 
@@ -102,6 +103,11 @@ For example:
     // abs() keeps the argument type:
     assert( abs(-1) is Int)
     assert( abs(-2.21) == 2.21 )
+
+    // clamp() limits value to the range:
+    assert( clamp(15, 0..10) == 10 )
+    assert( clamp(-5, 0..10) == 0 )
+    assert( 5.clamp(0..10) == 5 )
     >>> void
 
 ## Scientific constant

docs/parallelism.md

@@ -226,13 +226,11 @@ Future work: introduce thread‑safe pooling (e.g., per‑thread pools or confin
 
 Closures executed by `launch { ... }` and `flow { ... }` resolve names using the `ClosureScope` rules:
 
-1. Closure frame locals/arguments
-2. Captured receiver instance/class members
-3. Closure ancestry locals + each frame’s `this` members (cycle‑safe)
-4. Caller `this` members
-5. Caller ancestry locals + each frame’s `this` members (cycle‑safe)
-6. Module pseudo‑symbols (e.g., `__PACKAGE__`)
-7. Direct module/global fallback (nearest `ModuleScope` and its parent/root)
+1. **Current frame locals and arguments**: Variables defined within the current closure execution.
+2. **Captured lexical ancestry**: Outer local variables captured at the site where the closure was defined (the "lexical environment").
+3. **Captured receiver members**: If the closure was defined within a class or explicitly bound to an object, it checks members of that object (`this`), following MRO and respecting visibility.
+4. **Caller environment**: Falls back to the calling context (e.g., the caller's `this` or local variables).
+5. **Global/Module fallbacks**: Final check for module-level constants and global functions.
 
 Implications:
 - Outer locals (e.g., `counter`) stay visible across suspension points.

docs/perf_guide.md

@@ -33,7 +33,7 @@ PerfProfiles.restore(snap)  // restore previous flags
 - `ARG_BUILDER` — Efficient argument building: small‑arity no‑alloc and pooled builder on JVM (ON JVM default).
 - `ARG_SMALL_ARITY_12` — Extends small‑arity no‑alloc call paths from 0–8 to 0–12 arguments (JVM‑first exploration; OFF by default). Use for codebases with many 9–12 arg calls; A/B before enabling.
 - `SKIP_ARGS_ON_NULL_RECEIVER` — Early return on optional‑null receivers before building args (semantics‑compatible). A/B only.
-- `SCOPE_POOL` — Scope frame pooling for calls (JVM, per‑thread ThreadLocal pool). ON by default on JVM; togglable at runtime.
+- `SCOPE_POOL` — Scope frame pooling for calls (per‑thread ThreadLocal pool on JVM/Android/Native; global deque on JS/Wasm). ON by default on all platforms; togglable at runtime.
 - `FIELD_PIC` — 2‑entry polymorphic inline cache for field reads/writes keyed by `(classId, layoutVersion)` (ON JVM default).
 - `METHOD_PIC` — 2‑entry PIC for instance method calls keyed by `(classId, layoutVersion)` (ON JVM default).
 - `FIELD_PIC_SIZE_4` — Increases Field PIC size from 2 to 4 entries (JVM-first tuning; OFF by default). Use for sites with >2 receiver shapes.

docs/return_statement.md

@@ -0,0 +1,86 @@
+# The `return` statement
+
+The `return` statement is used to terminate the execution of the innermost enclosing callable (a function or a lambda) and optionally return a value to the caller.
+
+## Basic Usage
+
+By default, Lyng functions and blocks return the value of their last expression. However, `return` allows you to exit early, which is particularly useful for guard clauses.
+
+```lyng
+fun divide(a, b) {
+    if (b == 0) return null // Guard clause: early exit
+    a / b
+}
+```
+
+If no expression is provided, `return` returns `void`:
+
+```lyng
+fun logIfDebug(msg) {
+    if (!DEBUG) return
+    println("[DEBUG] " + msg)
+}
+```
+
+## Scoping Rules
+
+In Lyng, `return` always exits the **innermost enclosing callable**. Callables include:
+*   Named functions (`fun` or `fn`)
+*   Anonymous functions/lambdas (`{ ... }`)
+
+Standard control flow blocks like `if`, `while`, `do`, and `for` are **not** callables; `return` inside these blocks will return from the function or lambda that contains them.
+
+```lyng
+fun findFirstPositive(list) {
+    list.forEach { 
+        if (it > 0) return it // ERROR: This returns from the lambda, not findFirstPositive!
+    }
+    null
+}
+```
+*Note: To return from an outer scope, use [Non-local Returns](#non-local-returns).*
+
+## Non-local Returns
+
+Lyng supports returning from outer scopes using labels. This is a powerful feature for a closure-intensive language.
+
+### Named Functions as Labels
+Every named function automatically provides its name as a label.
+
+```lyng
+fun findFirstPositive(list) {
+    list.forEach { 
+        if (it > 0) return@findFirstPositive it // Returns from findFirstPositive
+    }
+    null
+}
+```
+
+### Labeled Lambdas
+You can explicitly label a lambda using the `@label` syntax to return from it specifically when nested.
+
+```lyng
+val process = @outer { x ->
+    val result = {
+        if (x < 0) return@outer "negative" // Returns from the outer lambda
+        x * 2
+    }()
+    "Result: " + result
+}
+```
+
+## Restriction on Shorthand Functions
+
+To maintain Lyng's clean, expression-oriented style, the `return` keyword is **forbidden** in shorthand function definitions (those using `=`).
+
+```lyng
+fun square(x) = x * x          // Correct
+fun square(x) = return x * x   // Syntax Error: 'return' not allowed here
+```
+
+## Summary
+*   `return [expression]` exits the innermost `fun` or `{}`.
+*   Use `return@label` for non-local returns.
+*   Named functions provide automatic labels.
+*   Cannot be used in `=` shorthand functions.
+*   Consistency: Mirrors the syntax and behavior of `break@label expression`.

docs/samples/fs_sample.lyng

@@ -1,7 +1,6 @@
 #!/bin/env lyng
 
 import lyng.io.fs
-import lyng.stdlib
 
 val files = Path("../..").list().toList()
 // most long is longest?

docs/samples/happy_numbers.lyng.bad

@@ -4,15 +4,21 @@
     test the Lyng way. It is not meant to be effective.
 */
 
-fun naiveCountHappyNumbers() {
+fun naiveCountHappyNumbers(): Int {
     var count = 0
-    for( n1 in 0..9 )
-        for( n2 in 0..9 )
-            for( n3 in 0..9 )
-                for( n4 in 0..9 )
-                    for( n5 in 0..9 )
-                        for( n6 in 0..9 )
+    for( n1 in 0..9 ) {
+        for( n2 in 0..9 ) {
+            for( n3 in 0..9 ) {
+                for( n4 in 0..9 ) {
+                    for( n5 in 0..9 ) {
+                        for( n6 in 0..9 ) {
                             if( n1 + n2 + n3 == n4 + n5 + n6 ) count++
+                        }
+                    }
+                }
+            }
+        }
+    }
     count
 }
 
@@ -28,4 +34,3 @@ for( r in 1..900 ) {
     assert( found == 55252 )
     delay(0.05)
 }
-

docs/samples/operator_overloading.lyng

@@ -0,0 +1,63 @@
+// Sample: Operator Overloading in Lyng
+
+class Vector(val x, val y) {
+    // Overload +
+    fun plus(other) = Vector(x + other.x, y + other.y)
+    
+    // Overload -
+    fun minus(other) = Vector(x - other.x, y - other.y)
+    
+    // Overload unary -
+    fun negate() = Vector(-x, -y)
+    
+    // Overload ==
+    fun equals(other) {
+        if (other is Vector) x == other.x && y == other.y
+        else false
+    }
+    
+    // Overload * (scalar multiplication)
+    fun mul(scalar) = Vector(x * scalar, y * scalar)
+    
+    override fun toString() = "Vector(${x}, ${y})"
+}
+
+val v1 = Vector(10, 20)
+val v2 = Vector(5, 5)
+
+println("v1: " + v1)
+println("v2: " + v2)
+
+// Test binary +
+val v3 = v1 + v2
+println("v1 + v2 = " + v3)
+assertEquals(Vector(15, 25), v3)
+
+// Test unary -
+val v4 = -v1
+println("-v1 = " + v4)
+assertEquals(Vector(-10, -20), v4)
+
+// Test scalar multiplication
+val v5 = v1 * 2
+println("v1 * 2 = " + v5)
+assertEquals(Vector(20, 40), v5)
+
+// Test += (falls back to plus)
+var v6 = Vector(1, 1)
+v6 += Vector(2, 2)
+println("v6 += (2,2) -> " + v6)
+assertEquals(Vector(3, 3), v6)
+
+// Test in-place mutation with plusAssign
+class Counter(var count) {
+    fun plusAssign(n) {
+        count = count + n
+    }
+}
+
+val c = Counter(0)
+c += 10
+c += 5
+println("Counter: " + c.count)
+assertEquals(15, c.count)

docs/scopes_and_closures.md

@@ -1,5 +1,7 @@
 # Scopes and Closures: resolution and safety
 
+Attention to AI: name lookup is ibsolete and must not be used with bytecode compiler
+
 This page documents how name resolution works with `ClosureScope`, how to avoid recursion pitfalls, and how to safely capture and execute callbacks that need access to outer locals.
 
 ## Why this matters
@@ -8,16 +10,13 @@ Name lookup across nested scopes and closures can accidentally form recursive re
 ## Resolution order in ClosureScope
 When evaluating an identifier `name` inside a closure, `ClosureScope.get(name)` resolves in this order:
 
-1. Closure frame locals and arguments
-2. Captured receiver (`closureScope.thisObj`) instance/class members
-3. Closure ancestry locals + each frame’s `thisObj` members (cycle‑safe)
-4. Caller `this` members
-5. Caller ancestry locals + each frame’s `thisObj` members (cycle‑safe)
-6. Module pseudo‑symbols (e.g., `__PACKAGE__`) from the nearest `ModuleScope`
-7. Direct module/global fallback (nearest `ModuleScope` and its parent/root scope)
-8. Final fallback: base local/parent lookup for the current frame
+1. **Current frame locals and arguments**: Variables defined within the current closure execution.
+2. **Captured lexical ancestry**: Outer local variables captured at the site where the closure was defined (the "lexical environment").
+3. **Captured receiver members**: If the closure was defined within a class or explicitly bound to an object, it checks members of that object (`this`). This includes both instance fields/methods and class-level static members, following the MRO (C3) and respecting visibility rules (private members are only visible if the closure was defined in their class).
+4. **Caller environment**: If not found lexically, it falls back to the calling context (e.g., the DSL's `this` or the caller's local variables).
+5. **Global/Module fallbacks**: Final check for module-level constants and global functions.
 
-This preserves intuitive visibility (locals → captured receiver → closure chain → caller members → caller chain → module/root) while preventing infinite recursion between scope types.
+This ensures that closures primarily interact with their defining environment (lexical capture) while still being able to participate in DSL-style calling contexts.
 
 ## Use raw‑chain helpers for ancestry walks
 When authoring new scope types or advanced lookups, avoid calling virtual `get` while walking parents. Instead, use the non‑dispatch helpers on `Scope`:
@@ -72,7 +71,7 @@ Tip: If a closure unexpectedly cannot see an outer local, check whether an inter
 
 The `cached` function (defined in `lyng.stdlib`) is a classic example of using closures to maintain state. It wraps a builder into a zero-argument function that computes once and remembers the result:
 
-```kotlin
+```lyng
 fun cached(builder) {
     var calculated = false
     var value = null

docs/serialization.md

@@ -20,20 +20,37 @@ It is as simple as:
     assert( text.length > encodedBits.toBuffer().size )
     >>> void
 
-Any class you create is serializable by default; lynon serializes first constructor fields, then any `var` member fields:
+Any class you create is serializable by default; lynon serializes first constructor fields, then any `var` member fields.
 
-    import lyng.serialization
+## Transient Fields
 
-    class Point(x,y)
+Sometimes you have fields that should not be serialized, for example, temporary caches, secret data, or derived values that are recomputed in `init` blocks. You can mark such fields with the `@Transient` attribute:
 
-    val p = Lynon.decode( Lynon.encode( Point(5,6) ) )
+```lyng
+class MyData(@Transient val tempSecret, val publicData) {
+    @Transient var cachedValue = 0
+    var persistentValue = 42
     
-    assertEquals( 5, p.x )
-    assertEquals( 6, p.y )
-    >>> void
+    init {
+        // cachedValue can be recomputed here upon deserialization
+        cachedValue = computeCache(publicData)
+    }
+}
+```
 
+Transient fields:
+- Are **omitted** from Lynon binary streams.
+- Are **omitted** from JSON output (via `toJson`).
+- Are **ignored** during structural equality checks (`==`).
+- If a transient constructor parameter has a **default value**, it will be restored to that default value during deserialization. Otherwise, it will be `null`.
+- Class body fields marked as `@Transient` will keep their initial values (or values assigned in `init`) after deserialization.
 
-just as expected.
+## Serialization of Objects and Classes
+
+- **Singleton Objects**: `object` declarations are serializable by name. Their state (mutable fields) is also serialized and restored, respecting `@Transient`.
+- **Classes**: Class objects themselves can be serialized. They are serialized by their full qualified name. When converted to JSON, a class object includes its public static fields (excluding those marked `@Transient`).
+
+## Custom Serialization
 
 Important is to understand that normally `Lynon.decode` wants [BitBuffer], as `Lynon.encode` produces. If you have the regular [Buffer], be sure to convert it:
 

docs/time.md

@@ -2,166 +2,105 @@
 
 Lyng date and time support requires importing `lyng.time` packages. Lyng uses simple yet modern time object models:
 
-- `Instant` class for time stamps with platform-dependent resolution
-- `Duration` to represent amount of time not depending on the calendar, e.g. in absolute units (milliseconds, seconds,
-  hours, days)
+- `Instant` class for absolute time stamps with platform-dependent resolution.
+- `DateTime` class for calendar-aware points in time within a specific time zone.
+- `Duration` to represent amount of time not depending on the calendar (e.g., milliseconds, seconds).
 
 ## Time instant: `Instant`
 
-Represent some moment of time not depending on the calendar (calendar for example may b e changed, daylight saving time
-can be for example introduced or dropped). It is similar to `TIMESTAMP` in SQL or `Instant` in Kotlin. Some moment of
-time; not the calendar date.
+Represent some moment of time not depending on the calendar. It is similar to `TIMESTAMP` in SQL or `Instant` in Kotlin.
 
-Instant is comparable to other Instant. Subtracting instants produce `Duration`, period in time that is not dependent on
-the calendar, e.g. absolute time period.
-
-It is possible to add or subtract `Duration` to and from `Instant`, that gives another `Instant`.
-
-Instants are converted to and from `Real` number of seconds before or after Unix Epoch, 01.01.1970. Constructor with
-single number parameter constructs from such number of seconds,
-and any instance provide `.epochSeconds` member:
+### Constructing and converting
 
     import lyng.time
 
     // default constructor returns time now:
     val t1 = Instant()
-    val t2 = Instant()
-    assert( t2 - t1 < 1.millisecond )
-    assert( t2.epochSeconds - t1.epochSeconds < 0.001 )
-    >>> void
     
-## Constructing
+    // constructing from a number is treated as seconds since unix epoch:
+    val t2 = Instant(1704110400) // 2024-01-01T12:00:00Z
     
-    import lyng.time
+    // from RFC3339 string:
+    val t3 = Instant("2024-01-01T12:00:00.123456Z")
     
-    // empty constructor gives current time instant using system clock:
-    val now = Instant()
+    // truncation:
+    val t4 = t3.truncateToMinute
+    assertEquals(t4.toRFC3339(), "2024-01-01T12:00:00Z")
     
-    // constructor with Instant instance makes a copy:
-    assertEquals( now, Instant(now) )
+    // to localized DateTime (uses system default TZ if not specified):
+    val dt = t3.toDateTime("+02:00")
+    assertEquals(dt.hour, 14)
 
-    // constructing from a number is trated as seconds since unix epoch:
-    val copyOfNow = Instant( now.epochSeconds )
-
-    // note that instant resolution is higher that Real can hold
-    // so reconstructed from real slightly differs:
-    assert( abs( (copyOfNow - now).milliseconds ) < 0.01 )
-    >>> void
-
-The resolution of system clock could be more precise and double precision real number of `Real`, keep it in mind.
-
-## Comparing and calculating periods
-
-    import lyng.time
-    
-    val now = Instant()
-    
-    // you cam add or subtract periods, and compare
-    assert( now - 5.minutes < now )
-    val oneHourAgo = now - 1.hour
-    assertEquals( now, oneHourAgo + 1.hour)
-
-    >>> void
-
-## Getting the max precision
-
-Normally, subtracting instants gives precision to microseconds, which is well inside the jitter
-the language VM adds. Still `Instant()` or `Instant.now()` capture most precise system timer at hand and provide inner
-value of 12 bytes, up to nanoseconds (hopefully). To access it use:
-
-    import lyng.time
-
-    // capture time
-    val now = Instant.now()
-
-    // this is Int value, number of whole epoch 
-    // milliseconds to the moment, it fits 8 bytes Int well
-    val seconds = now.epochWholeSeconds
-    assert(seconds is Int)
-
-    // and this is Int value of nanoseconds _since_ the epochMillis,
-    // it effectively add 4 more mytes int:
-    val nanos = now.nanosecondsOfSecond
-    assert(nanos is Int)
-    assert( nanos in 0..999_999_999 )
-
-    // we can construct epochSeconds from these parts:
-    assertEquals( now.epochSeconds, nanos * 1e-9 + seconds )
-    >>> void
-
-## Truncating to more realistic precision
-
-Full precision Instant is way too long and impractical to store, especially when serializing,
-so it is possible to truncate it to milliseconds, microseconds or seconds:
-
-    import lyng.time
-    import lyng.serialization
-
-    // max supported size (now microseconds for serialized value):
-    // note that encoding return _bit array_ and this is a _bit size_:
-    val s0 = Lynon.encode(Instant.now()).size
-
-    // shorter: milliseconds only
-    val s1 = Lynon.encode(Instant.now().truncateToMillisecond()).size
-
-    // truncated to seconds, good for file mtime, etc:
-    val s2 = Lynon.encode(Instant.now().truncateToSecond()).size 
-    assert( s1 < s0 )
-    assert( s2 < s1 )
-    >>> void
-
-## Formatting instants
-
-You can freely use `Instant` in string formatting. It supports usual sprintf-style formats:
-
-        import lyng.time
-        val now = Instant()
-
-        // will be something like "now: 12:10:05"
-        val currentTimeOnly24 =  "now: %tT"(now)
-
-        // we can extract epoch second with formatting too,
-        // this was since early C time
-
-        // get epoch while seconds from formatting
-        val unixEpoch = "Now is %ts since unix epoch"(now)
-        
-        // and it is the same as now.epochSeconds, int part:
-        assertEquals( unixEpoch, "Now is %d since unix epoch"(now.epochSeconds.toInt()) )
-        >>> void
-
-See
-the [complete list of available formats](https://github.com/sergeych/mp_stools?tab=readme-ov-file#datetime-formatting)
-and the [formatting reference](https://github.com/sergeych/mp_stools?tab=readme-ov-file#printf--sprintf): it all works
-in Lyng as `"format"(args...)`!
-
-## Instant members
+### Instant members
 
 | member                         | description                                             |
 |--------------------------------|---------------------------------------------------------|
 | epochSeconds: Real             | positive or negative offset in seconds since Unix epoch |
 | epochWholeSeconds: Int         | same, but in _whole seconds_. Slightly faster           |
-| nanosecondsOfSecond: Int       | offset from epochWholeSeconds in nanos (1)              |
+| nanosecondsOfSecond: Int       | offset from epochWholeSeconds in nanos                  |
 | isDistantFuture: Bool          | true if it `Instant.distantFuture`                      |
 | isDistantPast: Bool            | true if it `Instant.distantPast`                        |
-| truncateToSecond: Intant       | create new instnce truncated to second                  |  
-| truncateToMillisecond: Instant | truncate new instance with to millisecond               |
+| truncateToMinute: Instant      | create new instance truncated to minute                 |
+| truncateToSecond: Instant      | create new instance truncated to second                 |  
+| truncateToMillisecond: Instant | truncate new instance to millisecond                    |
 | truncateToMicrosecond: Instant | truncate new instance to microsecond                    |
+| toRFC3339(): String            | format as RFC3339 string (UTC)                          |
+| toDateTime(tz?): DateTime      | localize to a TimeZone (ID string or offset seconds)    |
 
-(1)
-: The value of nanoseconds is to be added to `epochWholeSeconds` to get exact time point. It is in 0..999_999_999 range.
-The precise time instant value therefore needs as for now 12 bytes integer; we might use bigint later (it is planned to
-be added)
+## Calendar time: `DateTime`
 
-## Class members
+`DateTime` represents a point in time in a specific timezone. It provides access to calendar components like year,
+month, and day.
+
+### Constructing
+
+    import lyng.time
+
+    // Current time in system default timezone
+    val now = DateTime.now()
+    
+    // Specific timezone
+    val offsetTime = DateTime.now("+02:00")
+    
+    // From Instant
+    val dt = Instant().toDateTime("Z")
+
+    // By components (year, month, day, hour=0, minute=0, second=0, timeZone="UTC")
+    val dt2 = DateTime(2024, 1, 1, 12, 0, 0, "Z")
+
+    // From RFC3339 string
+    val dt3 = DateTime.parseRFC3339("2024-01-01T12:00:00+02:00")
+
+### DateTime members
 
 | member                           | description                                   |
-|--------------------------------|----------------------------------------------|
-| Instant.now()                  | create new instance with current system time |
-| Instant.distantPast: Instant   | most distant instant in past                 |
-| Instant.distantFuture: Instant | most distant instant in future               |
+|----------------------------------|-----------------------------------------------|
+| year: Int                        | year component                                |
+| month: Int                       | month component (1..12)                       |
+| day: Int                         | day of month (alias `dayOfMonth`)             |
+| hour: Int                        | hour component (0..23)                        |
+| minute: Int                      | minute component (0..59)                      |
+| second: Int                      | second component (0..59)                      |
+| dayOfWeek: Int                   | day of week (1=Monday, 7=Sunday)              |
+| timeZone: String                 | timezone ID string                            |
+| toInstant(): Instant             | convert back to absolute Instant              |
+| toUTC(): DateTime                | shortcut to convert to UTC                    |
+| toTimeZone(tz): DateTime         | convert to another timezone                   |
+| addMonths(n): DateTime           | add/subtract months (normalizes end of month) |
+| addYears(n): DateTime            | add/subtract years                            |
+| toRFC3339(): String              | format with timezone offset                   |
+| static now(tz?): DateTime        | create DateTime with current time             |
+| static parseRFC3339(s): DateTime | parse RFC3339 string                          |
 
-# `Duraion` class
+### Arithmetic and normalization
+
+`DateTime` handles calendar arithmetic correctly:
+
+    val leapDay = Instant("2024-02-29T12:00:00Z").toDateTime("Z")
+    val nextYear = leapDay.addYears(1)
+    assertEquals(nextYear.day, 28) // Feb 29, 2024 -> Feb 28, 2025
+
+# `Duration` class
 
 Represent absolute time distance between two `Instant`.
 

docs/tutorial.md

@@ -8,8 +8,9 @@ __Other documents to read__ maybe after this one:
 
 - [Advanced topics](advanced_topics.md), [declaring arguments](declaring_arguments.md), [Scopes and Closures](scopes_and_closures.md)
 - [OOP notes](OOP.md), [exception handling](exceptions_handling.md)
-- [math in Lyng](math.md), [the `when` statement](when.md)
+- [math in Lyng](math.md), [the `when` statement](when.md), [return statement](return_statement.md)
 - [Testing and Assertions](Testing.md)
+- [Generics and type expressions](generics.md)
 - [time](time.md) and [parallelism](parallelism.md)
 - [parallelism] - multithreaded code, coroutines, etc.
 - Some class
@@ -32,6 +33,15 @@ any block also returns it's last expression:
     }
     >>> 6
 
+If you want to exit a function or lambda earlier, use the `return` statement:
+
+    fn divide(a, b) {
+        if( b == 0 ) return null
+        a / b
+    }
+
+See [return statement](return_statement.md) for more details on scoping and non-local returns.
+
 If you don't want block to return anything, use `void`:
 
     fn voidFunction() {
@@ -87,6 +97,44 @@ Lyng supports simple enums for a fixed set of named constants. Declare with `enu
 
 For more details (usage patterns, `when` switching, serialization), see OOP notes: [Enums in detail](OOP.md#enums).
 
+## Singleton Objects
+
+Singleton objects are declared using the `object` keyword. They define a class and create its single instance immediately.
+
+    object Logger {
+        fun log(msg) { println("[LOG] " + msg) }
+    }
+    
+    Logger.log("Hello singleton!")
+
+## Nested Declarations (short)
+
+Classes, objects, and enums can be declared inside another class. They live in the class namespace (no outer instance capture), so you access them with a qualifier:
+
+    class A {
+        class B(x?)
+        object Inner { val foo = "bar" }
+        enum E* { One, Two }
+    }
+
+    val ab = A.B()
+    assertEquals(ab.x, null)
+    assertEquals(A.Inner.foo, "bar")
+    assertEquals(A.One, A.E.One)
+
+See [OOP notes](OOP.md#nested-declarations) for rules, visibility, and enum lifting details.
+
+## Delegation (briefly)
+
+You can delegate properties and functions to other objects using the `by` keyword. This is perfect for patterns like `lazy` initialization.
+
+    val expensiveData by lazy {
+        // computed only once on demand
+        "computed"
+    }
+
+For more details on these features, see [Delegation in Lyng](delegation.md) and [OOP notes](OOP.md).
+
 When putting multiple statments in the same line it is convenient and recommended to use `;`:
 
     var from; var to
@@ -158,14 +206,13 @@ Note that assignment operator returns rvalue, it can't be assigned.
 ## Modifying arithmetics
 
 There is a set of assigning operations: `+=`, `-=`, `*=`, `/=` and even `%=`.
+There is also a special null-aware assignment operator `?=`: it performs the assignment only if the lvalue is `null`.
 
-    var x = 5
-    assert( 25 == (x*=5) )
-    assert( 25 == x)
-    assert( 24 == (x-=1) )
-    assert( 12 == (x/=2) )
-    x
-    >>> 12
+    var x = null
+    x ?= 10
+    assertEquals(10, x)
+    x ?= 20
+    assertEquals(10, x)
 
 Notice the parentheses here: the assignment has low priority!
 
@@ -195,6 +242,9 @@ This also prevents chain assignments so use parentheses:
 
 ## Nullability
 
+Nullability is part of the type. `String` is non-null, `String?` is nullable. Use `!!` to assert non-null and throw
+`NullReferenceException` if the value is `null`.
+
 When the value is `null`, it might throws `NullReferenceException`, the name is somewhat a tradition. To avoid it
 one can check it against null or use _null coalescing_. The null coalescing means, if the operand (left) is null,
 the operation won't be performed and the result will be null. Here is the difference:
@@ -213,11 +263,21 @@ the operation won't be performed and the result will be null. Here is the differ
     assert( ref?() == null )
     >>> void
 
+Note: `?.` is still a typed operation. The receiver must have a compile-time type that declares the member; if the
+receiver is `Object`, cast it first or declare a more specific type.
+
 There is also "elvis operator", null-coalesce infix operator '?:' that returns rvalue if lvalue is `null`:
 
     null ?: "nothing"
     >>> "nothing"
 
+There is also a null-aware assignment operator `?=`, which assigns a value only if the target is `null`:
+
+    var config = null
+    config ?= { port: 8080 }
+    config ?= { port: 9000 } // no-op, config is already not null
+    assertEquals(8080, config.port)
+
 ## Utility functions
 
 The following functions simplify nullable values processing and
@@ -277,6 +337,16 @@ It works much like `also`, but is executed in the context of the source object:
     assertEquals(p, Point(2,3))
     >>> void
 
+## with
+
+Sets `this` to the first argument and executes the block. Returns the value returned by the block:
+
+    class Point(x,y)
+    val p = Point(1,2)
+    val sum = with(p) { x + y }
+    assertEquals(3, sum)
+    >>> void
+
 ## run
 
 Executes a block after it returning the value passed by the block. for example, can be used with elvis operator:
@@ -379,8 +449,6 @@ Almost the same, using `val`:
     val foo = 1
     foo += 1 // this will throw exception
 
-# Constants
-
 Same as in kotlin:
 
     val HalfPi = π / 2
@@ -388,6 +456,144 @@ Same as in kotlin:
 Note using greek characters in identifiers! All letters allowed, but remember who might try to read your script, most
 likely will know some English, the rest is the pure uncertainty.
 
+# Types and inference
+
+Lyng uses Kotlin-style static types with inference. You can always write explicit types, but in most places the compiler
+can infer them from literals, defaults, and flow analysis.
+
+## Type annotations
+
+Use `:` to specify a type:
+
+    var x: Int = 10
+    val label: String = "count"
+    fun clamp(x: Int, min: Int, max: Int): Int { ... }
+
+`Object` is the top type. If you omit a type and there is no default value, the parameter is `Object` by default:
+
+    fun show(x) { println(x) }   // x is Object
+
+For nullable types, add `?`:
+
+    fun showMaybe(x: Object?) { ... }
+    fun parseInt(s: String?): Int? { ... }
+
+There is also a nullable shorthand for untyped parameters and constructor args: `x?` means `x: Object?`.
+It cannot be combined with an explicit type annotation.
+
+    class A(x?) { ... }     // x: Object?
+    fun f(x?) { x == null } // x: Object?
+
+Type aliases name type expressions and can be generic:
+
+    type Num = Int | Real
+    type Maybe<T> = T?
+
+Aliases expand to their underlying type expressions. See `docs/generics.md` for details.
+
+`void` is a singleton value of the class `Void`. `Void` can be used as an explicit return type:
+
+    fun log(msg): Void { println(msg); void }
+
+`Null` is the class of `null`. It is a singleton type and mostly useful for type inference results.
+
+## Type inference
+
+The compiler infers types from:
+
+- literals: `1` is `Int`, `1.0` is `Real`, `"s"` is `String`, `'c'` is `Char`
+- defaults: `fun f(x=1, name="n")` infers `x: Int`, `name: String`
+- assignments: `val x = call()` uses the return type of `call`
+- returns and branches: the result type of a block is the last expression, and if any branch is nullable,
+  the inferred type becomes nullable
+- numeric ops: `Int` and `Real` stay `Int` when both sides are `Int`, and promote to `Real` on mixed arithmetic
+
+Examples:
+
+    fun inc(x=0) = x + 1        // (Int)->Int
+    fun maybe(flag) { if(flag) 1 else null } // ()->Int?
+
+Untyped locals are allowed, but their type is fixed on the first assignment:
+
+    var x
+    x = 1       // x becomes Int
+    x = "one"   // compile-time error
+
+    var y = null  // y is Object?
+    val z = null  // z is Null
+
+Empty list/map literals default to `List<Object>` and `Map<Object,Object>` until a more specific type is known:
+
+    val xs = []             // List<Object>
+    val ys: List<Int> = []  // List<Int>
+
+Map literals infer key/value types from entries; named keys are `String`. See `docs/generics.md` for details.
+
+## Flow analysis
+
+Lyng uses flow analysis to narrow types inside branches:
+
+    fun len(x: String?): Int {
+        if( x == null ) return 0
+        // x is String (non-null) in this branch
+        return x.length
+    }
+
+`is` checks and `when` branches also narrow types:
+
+    fun kind(x: Object) {
+        if( x is Int ) return "int"
+        if( x is String ) return "string"
+        return "other"
+    }
+
+Narrowing is local to the branch; after the branch, the original type is restored.
+
+## Casts and unknown types
+
+Use `as` for explicit casts. The compiler inserts casts only when it can be valid and necessary. If a cast fails at
+runtime, it throws `ClassCastException`. If the value is nullable, `as T` implies a non-null assertion.
+
+Member access is resolved at compile time. Only members of `Object` are available on unknown types; non-Object members
+require an explicit cast:
+
+    fun f(x) {             // x is Object
+        x.toString()       // ok (Object member)
+        x.size()           // compile-time error
+        (x as List).size() // ok
+    }
+
+This avoids runtime name-resolution fallbacks; all symbols must be known at compile time.
+
+## Generics and bounds
+
+Generic parameters are declared with `<...>`:
+
+    fun id<T>(x: T): T = x
+    class Box<T>(val value: T)
+
+Bounds use `:` and can combine with `&` (intersection) and `|` (union):
+
+    fun sum<T: Int | Real>(x: T, y: T) = x + y
+    class Named<T: Iterable & Comparable>(val data: T)
+
+Type arguments are usually inferred from call sites:
+
+    val b = Box(10)     // Box<Int>
+    val s = id("ok")    // T is String
+
+See [Generics and type expressions](generics.md) for bounds, unions/intersections, and type-checking rules.
+
+## Variance
+
+Generic types are invariant by default, so `List<Int>` is not a `List<Object>`.
+Use declaration-site variance when you need it:
+
+    class Source<out T>(val value: T)
+    class Sink<in T> { fun accept(x: T) { ... } }
+
+`out` makes the type covariant (only produced), `in` makes it contravariant (only consumed).
+
 # Defining functions
 
     fun check(amount) {
@@ -533,6 +739,7 @@ See also: [Testing and Assertions](Testing.md)
         var result = []
         for( x in iterable ) result += transform(x)
     }
+    // loop variables are read-only inside the loop body
     assert( [11, 21, 31] == mapValues( [1,2,3], { it*10+1 }))
     >>> void
 
@@ -1206,7 +1413,7 @@ The same with `--`:
     sum
     >>> 5050
 
-There are self-assigning version for operators too:
+There is a self-assigning version for operators too:
 
     var count = 100
     var sum = 0
@@ -1284,7 +1491,7 @@ than enum arrays, until `Lynon.encodeTyped` will be implemented.
     var result = null // here we will store the result
     >>> null
 
-# Integral data types
+# Built-in types
 
 | type   | description                     | literal samples     |
 |--------|---------------------------------|---------------------|
@@ -1294,6 +1501,7 @@ than enum arrays, until `Lynon.encodeTyped` will be implemented.
 | Char   | single unicode character        | `'S'`, `'\n'`       |
 | String | unicode string, no limits       | "hello" (see below) |
 | List   | mutable list                    | [1, "two", 3]       |
+| Object | top type for all values         |                     |
 | Void   | no value could exist, singleton | void                |
 | Null   | missing value, singleton        | null                |
 | Fn     | callable type                   |                     |
@@ -1425,13 +1633,22 @@ Part match:
     assert( "foo" == $~.value )
     >>> void
 
-Typical set of String functions includes:
+Repeating the fragment:
+
+    assertEquals("hellohello", "hello"*2)
+    assertEquals("", "hello"*0)
+    >>> void
+
+A typical set of String functions includes:
 
 | fun/prop             | description / notes                                        |
 |----------------------|------------------------------------------------------------|
 | lower(), lowercase() | change case to unicode upper                               |
 | upper(), uppercase() | change case to unicode lower                               |
 | trim()               | trim space chars from both ends                            |
+| isEmpty()            | true if string is empty                                    |
+| isNotEmpty()         | true if string is not empty                                |
+| isBlank()            | true if empty or contains only whitespace                  |
 | startsWith(prefix)   | true if starts with a prefix                               |
 | endsWith(prefix)     | true if ends with a prefix                                 |
 | last()               | get last character of a string or throw                    |
@@ -1448,7 +1665,7 @@ Typical set of String functions includes:
 | s1 += s2             | self-modifying concatenation                               |
 | toReal()             | attempts to parse string as a Real value                   |
 | toInt()              | parse string to Int value                                  |
-| characters()         | create [List] of characters (1)                            |
+| characters           | create [List] of characters (1)                            |
 | encodeUtf8()         | returns [Buffer] with characters encoded to utf8           |
 | matches(re)          | matches the regular expression (2)                         |
 |                      |                                                            |
@@ -1498,7 +1715,7 @@ See [math functions](math.md). Other general purpose functions are:
 | flow {}                               | create flow sequence, see [parallelism]                    |
 | delay, launch, yield                  | see [parallelism]                                          |
 | cached(builder)                       | [Lazy evaluation with `cached`](#lazy-evaluation-with-cached) |
-| let, also, apply, run                 | see above, flow controls                                   |
+| let, also, apply, run, with       | see above, flow controls                                   |
 
 (1)
 : `fn` is optional lambda returning string message to add to exception string. 
@@ -1525,7 +1742,7 @@ Lambda avoid unnecessary execution if assertion is not failed. for example:
 
 [Range]: Range.md
 
-[String]: development/String.md
+[String]: ../archived/development/String.md
 
 [string formatting]: https://github.com/sergeych/mp_stools?tab=readme-ov-file#sprintf-syntax-summary
 
@@ -1553,13 +1770,13 @@ It is extremely simple to use: you pass it a block (lambda) that performs the co
 
 ### Basic Example
 
-```kotlin
+```lyng
 val expensive = cached {
     println("Performing expensive calculation...")
     2 + 2
 }
 
-println(expensive()) // Prints "Performing expensive calculation..." then "4"
+println(expensive()) // Prints "Performing expensive calculation...") then "4"
 println(expensive()) // Prints only "4" (result is cached)
 ```
 
@@ -1573,7 +1790,7 @@ println(expensive()) // Prints only "4" (result is cached)
 
 This is the most common use case for `cached`. It allows you to define expensive "fields" that are only computed if someone actually uses them:
 
-```kotlin
+```lyng
 class User(val id: Int) {
     // The details will be fetched only once, on demand
     val details = cached {
@@ -1649,7 +1866,7 @@ assertEquals(null, (buzz as? Foo)?.runA())
 
 Notes:
 - Resolution order uses C3 MRO (active): deterministic, monotonic order suitable for diamonds and complex hierarchies. Example: for `class D() : B(), C()` where both `B()` and `C()` derive from `A()`, the C3 order is `D → B → C → A`. The first visible match wins.
-- `private` is visible only inside the declaring class; `protected` is visible from the declaring class and any of its transitive subclasses. Qualialsofication (`this@Type`) or casts do not bypass visibility.
+- `private` is visible only inside the declaring class; `protected` is visible from the declaring class and its subclasses. Additionally, ancestors can access protected members of descendants if they override a member known to the ancestor. Qualification (`this@Type`) or casts do not bypass visibility.
 - Safe‑call `?.` works with `as?` for optional dispatch.
 
 ## Extension members

docs/wasm_generation_bug.md

@@ -0,0 +1,27 @@
+# Wasm generation hang in wasmJs browser tests
+
+## Summary
+The wasmJs browser test runner hung after commit 5f819dc. The root cause was invalid WebAssembly generated by the Kotlin/Wasm backend when certain compiler paths emitted suspend lambdas for `Statement` execution. The invalid module failed to instantiate in the browser, and Karma kept the browser connected but never ran tests.
+
+## Symptoms
+- `:lynglib:wasmJsBrowserTest` hangs indefinitely in ChromeHeadless.
+- `:lynglib:wasmJsNodeTest` fails with a WebAssembly compile error similar to:
+  - `struct.set expected type (ref null XXXX), found global.get of type (ref null YYYY)`
+- The failing function name in the wasm name section looks like:
+  - `net.sergeych.lyng.$invokeCOROUTINE$.doResume`
+
+## Root cause
+The delegation/var-declaration changes introduced compiler-generated suspend lambdas inside `Statement` construction (e.g., `statement { ... }` wrappers). Kotlin/Wasm generates extra coroutine state for those suspend lambdas, which in this case produced invalid wasm IR (mismatched GC reference types). The browser loader then waits forever because the module fails to instantiate.
+
+## Fix
+Avoid suspend-lambda `Statement` construction in compiler code paths. Replace `statement { ... }` and other anonymous suspend lambdas with explicit `object : Statement()` implementations and move logic into `override suspend fun execute(...)`. This keeps the resulting wasm IR valid while preserving behavior.
+
+## Where it was fixed
+- `lynglib/src/commonMain/kotlin/net/sergeych/lyng/Compiler.kt`
+- `lynglib/src/commonMain/kotlin/net/sergeych/lyng/Scope.kt`
+
+## Verification
+- `./gradlew :lynglib:wasmJsNodeTest --info`
+- `./gradlew :lynglib:wasmJsBrowserTest --info`
+
+Both tests finish quickly after the change.

docs/whats_new.md

@@ -1,6 +1,7 @@
 # What's New in Lyng
 
 This document highlights the latest additions and improvements to the Lyng language and its ecosystem.
+For a programmer-focused migration summary, see `docs/whats_new_1_5.md`.
 
 ## Language Features
 
@@ -24,6 +25,9 @@ class Person(private var _age: Int) {
 ### Private and Protected Setters
 You can now restrict the visibility of a property's or field's setter using `private set` or `protected set`. This allows members to be publicly readable but only writable from within the declaring class or its subclasses.
 
+### Refined Protected Visibility
+Ancestor classes can now access `protected` members of their descendants if it is an override of a member known to the ancestor. This enables base classes to call protected methods that are implemented or overridden in subclasses.
+
 ```lyng
 class Counter {
     var count = 0
@@ -93,6 +97,134 @@ let d = Derived()
 println((d as B).foo())             // Disambiguation via cast
 ```
 
+### Singleton Objects
+Singleton objects are declared using the `object` keyword. They provide a convenient way to define a class and its single instance in one go.
+
+```lyng
+object Config {
+    val version = "1.5.0-SNAPSHOT"
+    fun show() = println("Config version: " + version)
+}
+
+Config.show()
+```
+
+### Nested Declarations and Lifted Enums
+You can now declare classes, objects, enums, and type aliases inside another class. These nested declarations live in the class namespace (no outer instance capture) and are accessed with a qualifier.
+
+```lyng
+class A {
+    class B(x?)
+    object Inner { val foo = "bar" }
+    enum E* { One, Two }
+}
+
+val ab = A.B()
+assertEquals(ab.x, null)
+assertEquals(A.Inner.foo, "bar")
+assertEquals(A.One, A.E.One)
+```
+
+The `*` on `enum E*` lifts entries into the enclosing class namespace (compile-time error on ambiguity).
+
+### Object Expressions
+You can now create anonymous objects that inherit from classes or interfaces using the `object : Base { ... }` syntax. These expressions capture their lexical scope and support multiple inheritance.
+
+```lyng
+val worker = object : Runnable {
+    override fun run() = println("Working...")
+}
+
+val x = object : Base(arg1), Interface1 {
+    val property = 42
+    override fun method() = this@object.property * 2
+}
+```
+
+Use `this@object` to refer to the innermost anonymous object instance when `this` is rebound.
+
+### Unified Delegation Model
+A powerful new delegation system allows `val`, `var`, and `fun` members to delegate their logic to other objects using the `by` keyword.
+
+```lyng
+// Property delegation
+val lazyValue by lazy { "expensive" }
+
+// Function delegation
+fun remoteAction by myProxy
+
+// Observable properties
+var name by Observable("initial") { n, old, new -> 
+    println("Changed!") 
+}
+```
+
+The system features a unified interface (`getValue`, `setValue`, `invoke`) and a `bind` hook for initialization-time validation and configuration. See the [Delegation Guide](delegation.md) for more.
+
+### User-Defined Exception Classes
+You can now create custom exception types by inheriting from the built-in `Exception` class. Custom exceptions are real classes that can have their own fields and methods, and they work seamlessly with `throw` and `try-catch` blocks.
+
+```lyng
+class ValidationException(val field, m) : Exception(m)
+
+try {
+    throw ValidationException("email", "Invalid format")
+}
+catch(e: ValidationException) {
+    println("Error in " + e.field + ": " + e.message)
+}
+```
+
+### Assign-if-null Operator (`?=`)
+The new `?=` operator provides a concise way to assign a value only if the target is `null`. It is especially useful for setting default values or lazy initialization.
+
+```lyng
+var x = null
+x ?= 42          // x is now 42
+x ?= 100         // x remains 42 (not null)
+
+// Works with properties and index access
+config.port ?= 8080
+settings["theme"] ?= "dark"
+```
+
+The operator returns the final value of the receiver (the original value if it was not `null`, or the new value if the assignment occurred).
+
+### Transient Attribute (`@Transient`)
+The `@Transient` attribute can now be applied to class fields, constructor parameters, and static fields to exclude them from serialization.
+
+```lyng
+class MyData(@Transient val tempSecret, val publicData) {
+    @Transient var cachedValue = 0
+    var persistentValue = 42
+}
+```
+
+Key features:
+- **Serialization**: Transient members are omitted from both Lynon binary streams and JSON output.
+- **Structural Equality**: Transient fields are automatically ignored during `==` equality checks.
+- **Deserialization**: Transient constructor parameters with default values are correctly restored to those defaults upon restoration.
+
+### Value Clamping (`clamp`)
+A new `clamp()` function has been added to the standard library to limit a value within a specified range. It is available as both a global function and an extension method on all objects.
+
+```lyng
+// Global function
+clamp(15, 0..10)    // returns 10
+clamp(-5, 0..10)   // returns 0
+
+// Extension method
+val x = 15
+x.clamp(0..10)      // returns 10
+
+// Exclusive and open-ended ranges
+15.clamp(0..<10)    // returns 9
+15.clamp(..10)      // returns 10
+-5.clamp(0..)       // returns 0
+```
+
+`clamp()` correctly handles inclusive (`..`) and exclusive (`..<`) ranges. For discrete types like `Int` and `Char`, clamping to an exclusive upper bound returns the previous value.
+
 ## Tooling and Infrastructure
 
 ### CLI: Formatting Command
@@ -108,3 +240,14 @@ lyng fmt --check MyFile.lyng     # Check if file needs formatting
 Experimental lightweight autocompletion is now available in the IntelliJ plugin. It features type-aware member suggestions and inheritance-aware completion.
 
 You can enable it in **Settings | Lyng Formatter | Enable Lyng autocompletion**.
+
+### Kotlin API: Exception Handling
+The `Obj.getLyngExceptionMessageWithStackTrace()` extension method has been added to simplify retrieving detailed error information from Lyng exception objects in Kotlin. Additionally, `getLyngExceptionMessage()` and `raiseAsExecutionError()` now accept an optional `Scope`, making it easier to use them when a scope is not immediately available.
+
+### Kotlin API: Bridge Reflection and Class Binding (Preferred Extensions)
+Lyng now provides a public Kotlin reflection bridge and a Lyng‑first class binding workflow. This is the **preferred** way to write Kotlin extensions and library integrations:
+
+- **Bridge resolver**: explicit handles for values, vars, and callables with predictable lookup rules.
+- **Class bridge binding**: declare classes/members in Lyng (marked `extern`) and bind the implementations in Kotlin before the first instance is created.
+
+See **Embedding Lyng** for full samples and usage details.

docs/whats_new_1_3.md

@@ -0,0 +1,133 @@
+# What's New in Lyng 1.3 (vs 1.2.* / master)
+
+This is a programmer-focused summary of what changed since the 1.2.* line on `master`. It highlights new language and type-system features, runtime/IDE improvements, and how to migrate code safely.
+
+## Highlights
+
+- Generics are now a first-class part of the type system, with bounds, variance, unions, and intersections.
+- Type aliases and type-expression checks (`T1 is T2`, `A in T`) enable richer static modeling.
+- Nested declarations inside classes, plus lifted enum entries via `enum E*`.
+- Stepped ranges (`step`) including iterable open-ended and real ranges.
+- Runtime and compiler speedups: more bytecode coverage, direct slot access, call-site caching.
+
+## Language and type system
+
+### Generics, bounds, and variance
+
+You can declare generic functions/classes with `<...>`, restrict them with bounds, and control variance.
+
+```lyng
+fun id<T>(x: T): T = x
+class Box<out T>(val value: T)
+
+fun sum<T: Int | Real>(x: T, y: T) = x + y
+class Named<T: Iterable & Comparable>(val data: T)
+```
+
+### Type aliases and type expressions
+
+Type aliases can name any type expression, including unions and intersections.
+
+```lyng
+type Num = Int | Real
+type Maybe<T> = T?
+```
+
+Type expressions can be checked directly:
+
+```lyng
+fun f<T>(xs: List<T>) {
+    assert( T is Int | String | Bool ) // type-subset check
+    assert( Int in T )                 // same relation as `Int is T`
+}
+```
+
+Value checks remain `x is T`. Type expression equality uses `==` and is structural.
+
+### Nullable shorthand for parameters
+
+Untyped parameters and constructor args can use `x?` as shorthand for `x: Object?`:
+
+```lyng
+class A(x?) { ... }
+fun f(x?) { x == null }
+```
+
+### List/map literal inference
+
+The compiler now infers element and key/value types from literals and spreads. Mixed element types produce unions.
+
+```lyng
+val a = [1, 2, 3]             // List<Int>
+val b = [1, "two", true]      // List<Int | String | Bool>
+val m = { "a": 1, "b": "x" } // Map<String, Int | String>
+```
+
+### Compile-time member access only
+
+Member access is resolved at compile time. On unknown types, only `Object` members are visible; other members require an explicit cast.
+
+```lyng
+fun f(x) {          // x: Object
+    x.toString()    // ok
+    x.size()        // compile-time error
+    (x as List).size()
+}
+```
+
+This removes runtime name-resolution fallbacks and makes errors deterministic.
+
+### Nested declarations and lifted enums
+
+Classes, objects, enums, and type aliases can be declared inside another class and accessed by qualifier. Enums can lift entries into the outer namespace with `*`.
+
+```lyng
+class A {
+    class B(x?)
+    object Inner { val foo = "bar" }
+    type Alias = B
+    enum E* { One, Two }
+}
+
+val b = A.B()
+assertEquals(A.One, A.E.One)
+```
+
+### Stepped ranges
+
+Ranges now support `step`, and open-ended/real ranges are iterable only with an explicit step.
+
+```lyng
+(1..5 step 2).toList()      // [1,3,5]
+(0.0..1.0 step 0.25).toList() // [0,0.25,0.5,0.75,1.0]
+(0.. step 1).take(3).toList() // [0,1,2]
+```
+
+## Tooling and performance
+
+- Bytecode compiler/VM coverage expanded (loops, expressions, calls), improving execution speed and consistency.
+- Direct frame-slot access and scoped slot addressing reduce lookup overhead, including in closures.
+- Call-site caching and numeric fast paths reduce hot-loop overhead.
+- IDE tooling updated for the new type system and nested declarations; MiniAst-based completion work continues.
+
+## Migration guide (from 1.2.*)
+
+1) Replace dynamic member access on unknown types
+- If you relied on runtime name resolution, add explicit casts or annotate types so the compiler can resolve members.
+
+2) Adopt new type-system constructs where helpful
+- Consider `type` aliases for complex unions/intersections.
+- Prefer generic signatures over `Object` when the API is parametric.
+
+3) Update range iteration where needed
+- Use `step` for open-ended or real ranges you want to iterate.
+
+4) Nullable shorthand is optional
+- If you used untyped nullable params, you can keep `x` (Object) or switch to `x?` (Object?) for clarity.
+
+## References
+
+- `docs/generics.md`
+- `docs/Range.md`
+- `docs/OOP.md`
+- `docs/BytecodeSpec.md`

docs/whats_new_1_5.md

@@ -0,0 +1,140 @@
+# What's New in Lyng 1.5 (vs 1.3.* / master)
+
+This document summarizes the significant changes and new features introduced in the 1.5 development cycle.
+
+## Principal changes
+
+### JIT compiler and compile-time types and symbols.
+
+This major improvement gives the following big advantages:
+
+- **Blazing Fast execution**: several times faster! (three to six times speedup in different scenarios).
+- **Better IDE support**: autocompletion, early error detection, types check.
+- **Error safety**: all symbols and types are checked at bound at compile-time. Many errors are detected earlier. Also, no risk that external or caller code would shadow some internally used symbols (especially in closures and inheritance).
+
+In particular, it means no slow and flaky runtime lookups. Once compiled, code guarantees that it will always call the symbol known at compile-time; runtime name lookup though does not guarantee it and can be source of hard to trace bugs. 
+
+### New stable API to create Kotlin extensions
+
+The API is fixed and will be kept with further Lyng core changes. It is now the recommended way to write Lyng extensions in Kotlin. It is much simpler and more elegant than the internal one. See [Kotlin Bridge Binding](../notes/kotlin_bridge_binding.md).
+
+### Smart types system
+
+- **Deep inference**: The compiler analyzes types of symbols along the execution path and in many cases eliminates unnecessary casts or type specifications.
+- **Union and intersection types**: `A & B`, `A | B`.
+- **Generics**: Generic types are first-class citizens with support for [bounds and variance](generics.md). No type erasure: in a generic function you can, for example, check `A in T`, where T is the generic type.
+- **Inner classes and enums**: Full support for nested declarations, including [Enums with lifting](OOP.md#lifted-enum-entries).
+
+## Other highlights
+
+- **The `return` Statement**: Added support for local and non-local returns using labels.
+- **Abstract Classes and Interfaces**: Full support for `abstract` members and the `interface` keyword.
+- **Singleton Objects**: Define singletons using the `object` keyword or use anonymous object expressions.
+- **Multiple Inheritance**: Enhanced multi-inheritance with predictable [C3 MRO resolution](OOP.md#multiple-inheritance-and-mro).
+- **Unified Delegation**: Powerful delegation model for `val`, `var`, and `fun` members. See [Delegation](delegation.md).
+- **Class Properties with Accessors**: Define `val` and `var` properties with custom `get()` and `set()`.
+- **Restricted Setter Visibility**: Use `private set` and `protected set` on fields and properties.
+- **Late-initialized `val`**: Support for `val` fields that are initialized in `init` blocks or class bodies.
+- **Transient Members**: Use `@Transient` to exclude members from serialization and equality checks.
+- **Named Arguments and Splats**: Improved call-site readability with `name: value` and map-based splats.
+- **Refined Visibility**: Improved `protected` access and `closed` modifier for better encapsulation.
+
+## Language Features
+
+### The `return` Statement
+You can now exit from the innermost enclosing callable (function or lambda) using `return`. Lyng also supports non-local returns to outer scopes using labels. See [Return Statement](return_statement.md).
+
+```lyng
+fun findFirst<T>(list: Iterable<T>, predicate: (T)->Bool): T? {
+    list.forEach {
+        if (predicate(it)) return@findFirst it
+    }
+    null
+}
+```
+
+### Abstract Classes and Interfaces
+Lyng now supports the `abstract` modifier for classes and their members. `interface` is introduced as a synonym for `abstract class`, allowing for rich multi-inheritance patterns.
+
+```lyng
+interface Shape {
+    abstract val area: Real
+    fun describe() = "Area: %g"(area)
+}
+
+class Circle(val radius: Real) : Shape {
+    override val area get = Math.PI * radius * radius
+}
+```
+
+### Class Properties with Accessors
+Properties can now have custom getters and setters. They do not have automatic backing fields, making them perfect for computed values or delegation.
+
+```lyng
+class Rectangle(var width: Real, var height: Real) {
+    val area: Real get() = width * height
+    
+    var squareSize: Real
+        get() = area
+        set(v) {
+            width = sqrt(v)
+            height = width
+        }
+}
+```
+
+### Singleton Objects
+Declare singletons or anonymous objects easily.
+
+```lyng
+object Database {
+    val connection = "connected"
+}
+
+val runner = object : Runnable {
+    override fun run() = println("Running!")
+}
+```
+
+### Named Arguments and Named Splats
+Improve call-site clarity by specifying argument names. You can also expand a Map into named arguments using the splat operator.
+
+```lyng
+fun configure(timeout: Int, retry: Int = 3) { ... }
+
+configure(timeout: 5000, retry: 5)
+val options = Map("timeout": 1000, "retry": 1)
+configure(...options)
+```
+
+### Modern Operators
+The `?=` operator allows for concise "assign if null" logic.
+
+```lyng
+var cache: Map? = null
+cache ?= Map("status": "ok") // Only assigns if cache is null
+```
+
+## Tooling and IDE
+
+- **IDEA Plugin**: Significant improvements to autocompletion, documentation tooltips, and natural language support (Grazie integration).
+- **CLI**: The `lyng fmt` command is now a first-class tool for formatting code with various options like `--check` and `--in-place`.
+- **Performance**: Ongoing optimizations in the bytecode VM and compiler for faster execution and smaller footprint.
+
+## Standard Library
+- **`with(self, block)`**: Scoped execution with a dedicated `self`.
+- **`clamp(value, min, max)`**: Easily restrict values to a range.
+
+## Migration Guide (from 1.3.*)
+
+1. **Check Visibility**: Refined `protected` and `private` rules may catch previously undetected invalid accesses.
+2. **Override Keyword**: Ensure all members that override ancestor declarations are marked with the `override` keyword (now mandatory).
+3. **Return in Shorthand**: Remember that `return` is forbidden in `=` shorthand functions; use block syntax if you need early exit.
+4. **Empty Map Literals**: Use `Map()` or `{:}` for empty maps, as `{}` is now strictly a block/lambda.
+
+## References
+- [Object Oriented Programming](OOP.md)
+- [Generics](generics.md)
+- [Return Statement](return_statement.md)
+- [Delegation](delegation.md)
+- [Tutorial](tutorial.md)

editors/lyng-textmate/README.md

@@ -20,7 +20,7 @@ Files
   - Constants: `true`, `false`, `null`, `this`
   - Annotations: `@name` (Unicode identifiers supported)
   - Labels: `name:` (Unicode identifiers supported)
-  - Declarations: highlights declared names in `fun|fn name`, `class|enum Name`, `val|var name`
+  - Declarations: highlights declared names in `fun|fn name`, `class|enum|interface Name`, `val|var name`
   - Types: built-ins (`Int|Real|String|Bool|Char|Regex`) and Capitalized identifiers (heuristic)
   - Operators including ranges (`..`, `..<`, `...`), null-safe (`?.`, `?[`, `?(`, `?{`, `?:`, `??`), arrows (`->`, `=>`, `::`), match operators (`=~`, `!~`), bitwise, arithmetic, etc.
   - Shuttle operator `<=>`

editors/lyng-textmate/package.json

@@ -2,7 +2,7 @@
   "name": "lyng-textmate",
   "displayName": "Lyng",
   "description": "TextMate grammar for the Lyng language (for JetBrains IDEs via TextMate Bundles and VS Code).",
-  "version": "0.0.3",
+  "version": "0.1.0",
   "publisher": "lyng",
   "license": "Apache-2.0",
   "engines": { "vscode": "^1.0.0" },

editors/lyng-textmate/syntaxes/lyng.tmLanguage.json

@@ -42,7 +42,7 @@
         { "name": "constant.numeric.decimal.lyng", "match": "(?<![A-Za-z_])(?:[0-9][0-9_]*)\\.(?:[0-9_]+)(?:[eE][+-]?[0-9_]+)?|(?<![A-Za-z_])(?:[0-9][0-9_]*)(?:[eE][+-]?[0-9_]+)?" }
       ]
     },
-    "annotations": { "patterns": [ { "name": "entity.name.label.at.lyng", "match": "@[\\p{L}_][\\p{L}\\p{N}_]*:" }, { "name": "storage.modifier.annotation.lyng", "match": "@[\\p{L}_][\\p{L}\\p{N}_]*" } ] },
+    "annotations": { "patterns": [ { "name": "entity.name.label.at.lyng", "match": "@[\\p{L}_][\\p{L}\\p{N}_]*" } ] },
     "mapLiterals": {
       "patterns": [
         {
@@ -74,11 +74,11 @@
         }
       ]
     },
-    "labels": { "patterns": [ { "name": "entity.name.label.lyng", "match": "[\\p{L}_][\\p{L}\\p{N}_]*:" } ] },
+    "labels": { "patterns": [ { "name": "entity.name.label.lyng", "match": "[\\p{L}_][\\p{L}\\p{N}_]*@" } ] },
     "directives": { "patterns": [ { "name": "meta.directive.lyng", "match": "^\\s*#[_A-Za-z][_A-Za-z0-9]*" } ] },
-    "declarations": { "patterns": [ { "name": "meta.function.declaration.lyng", "match": "\\b(fun|fn)\\s+(?:([\\p{L}_][\\p{L}\\p{N}_]*)\\.)?([\\p{L}_][\\p{L}\\p{N}_]*)", "captures": { "1": { "name": "keyword.declaration.lyng" }, "2": { "name": "entity.name.type.lyng" }, "3": { "name": "entity.name.function.lyng" } } }, { "name": "meta.type.declaration.lyng", "match": "\\b(?:class|enum)\\s+([\\p{L}_][\\p{L}\\p{N}_]*)", "captures": { "1": { "name": "entity.name.type.lyng" } } }, { "name": "meta.variable.declaration.lyng", "match": "\\b(val|var)\\s+(?:([\\p{L}_][\\p{L}\\p{N}_]*)\\.)?([\\p{L}_][\\p{L}\\p{N}_]*)", "captures": { "1": { "name": "keyword.declaration.lyng" }, "2": { "name": "entity.name.type.lyng" }, "3": { "name": "variable.other.declaration.lyng" } } } ] },
-    "keywords": { "patterns": [ { "name": "keyword.control.lyng", "match": "\\b(?:if|else|when|while|do|for|try|catch|finally|throw|return|break|continue)\\b" }, { "name": "keyword.declaration.lyng", "match": "\\b(?:fun|fn|class|enum|val|var|import|package|constructor|property|open|extern|private|protected|static|get|set)\\b" }, { "name": "keyword.operator.word.lyng", "match": "\\bnot\\s+(?:in|is)\\b" }, { "name": "keyword.operator.word.lyng", "match": "\\b(?:and|or|not|in|is|as|as\\?)\\b" } ] },
-    "constants": { "patterns": [ { "name": "constant.language.lyng", "match": "(?:\\b(?:true|false|null|this)\\b|π)" } ] },
+    "declarations": { "patterns": [ { "name": "meta.function.declaration.lyng", "match": "\\b(fun|fn)\\s+(?:([\\p{L}_][\\p{L}\\p{N}_]*)\\.)?([\\p{L}_][\\p{L}\\p{N}_]*)", "captures": { "1": { "name": "keyword.declaration.lyng" }, "2": { "name": "entity.name.type.lyng" }, "3": { "name": "entity.name.function.lyng" } } }, { "name": "meta.type.declaration.lyng", "match": "\\b(?:class|enum|interface|object)(?:\\s+([\\p{L}_][\\p{L}\\p{N}_]*))?", "captures": { "1": { "name": "entity.name.type.lyng" } } }, { "name": "meta.variable.declaration.lyng", "match": "\\b(val|var)\\s+(?:([\\p{L}_][\\p{L}\\p{N}_]*)\\.)?([\\p{L}_][\\p{L}\\p{N}_]*)", "captures": { "1": { "name": "keyword.declaration.lyng" }, "2": { "name": "entity.name.type.lyng" }, "3": { "name": "variable.other.declaration.lyng" } } } ] },
+    "keywords": { "patterns": [ { "name": "keyword.control.lyng", "match": "\\b(?:if|else|when|while|do|for|try|catch|finally|throw|return|break|continue)\\b" }, { "name": "keyword.declaration.lyng", "match": "\\b(?:fun|fn|class|enum|interface|val|var|import|package|constructor|property|abstract|override|open|closed|extern|private|protected|static|get|set|object|init|by)\\b" }, { "name": "keyword.operator.word.lyng", "match": "\\bnot\\s+(?:in|is)\\b" }, { "name": "keyword.operator.word.lyng", "match": "\\b(?:and|or|not|in|is|as|as\\?)\\b" } ] },
+    "constants": { "patterns": [ { "name": "constant.language.lyng", "match": "(?:\\b(?:true|false|null|this(?:@[\\p{L}_][\\p{L}\\p{N}_]*)?)\\b|π)" } ] },
     "types": { "patterns": [ { "name": "storage.type.lyng", "match": "\\b(?:Int|Real|String|Bool|Char|Regex)\\b" }, { "name": "entity.name.type.lyng", "match": "\\b[A-Z][A-Za-z0-9_]*\\b(?!\\s*\\()" } ] },
     "operators": { "patterns": [ { "name": "keyword.operator.comparison.lyng", "match": "===|!==|==|!=|<=|>=|<|>" }, { "name": "keyword.operator.shuttle.lyng", "match": "<=>" }, { "name": "keyword.operator.arrow.lyng", "match": "=>|->|::" }, { "name": "keyword.operator.range.lyng", "match": "\\.\\.\\.|\\.\\.<|\\.\\." }, { "name": "keyword.operator.nullsafe.lyng", "match": "\\?\\.|\\?\\[|\\?\\(|\\?\\{|\\?:|\\?\\?" }, { "name": "keyword.operator.assignment.lyng", "match": "(?:\\+=|-=|\\*=|/=|%=|=)" }, { "name": "keyword.operator.logical.lyng", "match": "&&|\\|\\|" }, { "name": "keyword.operator.bitwise.lyng", "match": "<<|>>|&|\\||\\^|~" }, { "name": "keyword.operator.match.lyng", "match": "=~|!~" }, { "name": "keyword.operator.arithmetic.lyng", "match": "\\+\\+|--|[+\\-*/%]" }, { "name": "keyword.operator.other.lyng", "match": "[!?]" } ] },
     "punctuation": { "patterns": [ { "name": "punctuation.separator.comma.lyng", "match": "," }, { "name": "punctuation.terminator.statement.lyng", "match": ";" }, { "name": "punctuation.section.block.begin.lyng", "match": "[(]{1}|[{]{1}|\\[" }, { "name": "punctuation.section.block.end.lyng", "match": "[)]{1}|[}]{1}|\\]" }, { "name": "punctuation.accessor.dot.lyng", "match": "\\." }, { "name": "punctuation.separator.colon.lyng", "match": ":" } ] }

gradle.properties

@@ -1,5 +1,5 @@
 #
-# Copyright 2025 Sergey S. Chernov real.sergeych@gmail.com
+# Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -16,7 +16,7 @@
 #
 
 #Gradle
-org.gradle.jvmargs=-Xmx2048M -Dfile.encoding=UTF-8 -Dkotlin.daemon.jvm.options\="-Xmx2048M"
+org.gradle.jvmargs=-Xmx4096M -Dfile.encoding=UTF-8 -Dkotlin.daemon.jvm.options\="-Xmx2048M"
 org.gradle.caching=true
 org.gradle.configuration-cache=true
 #Kotlin

gradle/libs.versions.toml

@@ -5,6 +5,7 @@ kotlin = "2.3.0"
 android-minSdk = "24"
 android-compileSdk = "34"
 kotlinx-coroutines = "1.10.2"
+kotlinx-datetime = "0.6.1"
 mp_bintools = "0.3.2"
 firebaseCrashlyticsBuildtools = "3.0.3"
 okioVersion = "3.10.2"
@@ -16,6 +17,7 @@ clikt-markdown = { module = "com.github.ajalt.clikt:clikt-markdown", version.ref
 kotlin-test = { module = "org.jetbrains.kotlin:kotlin-test", version.ref = "kotlin" }
 kotlinx-coroutines-test = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-test", version.ref = "kotlinx-coroutines" }
 kotlinx-coroutines-core = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-core", version.ref = "kotlinx-coroutines" }
+kotlinx-datetime = { module = "org.jetbrains.kotlinx:kotlinx-datetime", version.ref = "kotlinx-datetime" }
 mp_bintools = { module = "net.sergeych:mp_bintools", version.ref = "mp_bintools" }
 firebase-crashlytics-buildtools = { group = "com.google.firebase", name = "firebase-crashlytics-buildtools", version.ref = "firebaseCrashlyticsBuildtools" }
 okio = { module = "com.squareup.okio:okio", version.ref = "okioVersion" }

lyng-idea/build.gradle.kts

@@ -17,7 +17,7 @@
 
 plugins {
     kotlin("jvm")
-    id("org.jetbrains.intellij") version "1.17.3"
+    id("org.jetbrains.intellij") version "1.17.4"
 }
 
 group = "net.sergeych.lyng"
@@ -45,12 +45,14 @@ dependencies {
     // Tests for IntelliJ Platform fixtures rely on JUnit 3/4 API (junit.framework.TestCase)
     // Add JUnit 4 which contains the JUnit 3 compatibility classes used by BasePlatformTestCase/UsefulTestCase
     testImplementation("junit:junit:4.13.2")
+    testRuntimeOnly("org.junit.vintage:junit-vintage-engine:5.10.2")
+    testImplementation("org.opentest4j:opentest4j:1.3.0")
 }
 
 intellij {
     type.set("IC")
     // Build against a modern baseline. Install range is controlled by since/until below.
-    version.set("2024.3.1")
+    version.set("2024.1.6")
     // We manage <idea-version> ourselves in plugin.xml to keep it open-ended (no upper cap)
     updateSinceUntilBuild.set(false)
     // Include only available bundled plugins for this IDE build

lyng-idea/src/main/kotlin/net/sergeych/lyng/idea/LyngFileTypeFactory.kt

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+package net.sergeych.lyng.idea
+
+import com.intellij.openapi.fileTypes.FileTypeConsumer
+import com.intellij.openapi.fileTypes.FileTypeFactory
+import com.intellij.openapi.fileTypes.WildcardFileNameMatcher
+
+/**
+ * Legacy way to register file type matchers, used here to robustly match *.lyng.d
+ * without conflicting with standard .d extensions from other plugins.
+ */
+@Suppress("DEPRECATION")
+class LyngFileTypeFactory : FileTypeFactory() {
+    override fun createFileTypes(consumer: FileTypeConsumer) {
+        // Register the multi-dot pattern explicitly
+        consumer.consume(LyngFileType, WildcardFileNameMatcher("*.lyng.d"))
+    }
+}

lyng-idea/src/main/kotlin/net/sergeych/lyng/idea/actions/RunLyngScriptAction.kt

@@ -0,0 +1,145 @@
+/*
+ * Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package net.sergeych.lyng.idea.actions
+
+import com.intellij.execution.filters.TextConsoleBuilderFactory
+import com.intellij.execution.ui.ConsoleView
+import com.intellij.execution.ui.ConsoleViewContentType
+import com.intellij.openapi.actionSystem.AnAction
+import com.intellij.openapi.actionSystem.AnActionEvent
+import com.intellij.openapi.actionSystem.CommonDataKeys
+import com.intellij.openapi.project.Project
+import com.intellij.openapi.wm.ToolWindow
+import com.intellij.openapi.wm.ToolWindowAnchor
+import com.intellij.openapi.wm.ToolWindowId
+import com.intellij.openapi.wm.ToolWindowManager
+import com.intellij.psi.PsiFile
+import com.intellij.psi.PsiManager
+import com.intellij.ui.content.ContentFactory
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.launch
+import net.sergeych.lyng.ExecutionError
+import net.sergeych.lyng.Script
+import net.sergeych.lyng.Source
+import net.sergeych.lyng.requireScope
+import net.sergeych.lyng.idea.LyngIcons
+import net.sergeych.lyng.obj.ObjVoid
+import net.sergeych.lyng.obj.getLyngExceptionMessageWithStackTrace
+
+class RunLyngScriptAction : AnAction(LyngIcons.FILE) {
+    private val scope = CoroutineScope(Dispatchers.Default + SupervisorJob())
+
+    private fun getPsiFile(e: AnActionEvent): PsiFile? {
+        val project = e.project ?: return null
+        return e.getData(CommonDataKeys.PSI_FILE) ?: run {
+            val vf = e.getData(CommonDataKeys.VIRTUAL_FILE)
+            if (vf != null) PsiManager.getInstance(project).findFile(vf) else null
+        }
+    }
+
+    override fun update(e: AnActionEvent) {
+        val psiFile = getPsiFile(e)
+        val isLyng = psiFile?.name?.endsWith(".lyng") == true
+        e.presentation.isEnabledAndVisible = isLyng
+        if (isLyng) {
+            e.presentation.text = "Run '${psiFile.name}'"
+        } else {
+            e.presentation.text = "Run Lyng Script"
+        }
+    }
+
+    override fun actionPerformed(e: AnActionEvent) {
+        val project = e.project ?: return
+        val psiFile = getPsiFile(e) ?: return
+        val text = psiFile.text
+        val fileName = psiFile.name
+
+        val (console, toolWindow) = getConsoleAndToolWindow(project)
+        console.clear()
+
+        toolWindow.show {
+            scope.launch {
+                try {
+                    val lyngScope = Script.newScope()
+                    lyngScope.addFn("print") {
+                        val sb = StringBuilder()
+                        for ((i, arg) in args.list.withIndex()) {
+                            if (i > 0) sb.append(" ")
+                            sb.append(arg.toString(requireScope()).value)
+                        }
+                        console.print(sb.toString(), ConsoleViewContentType.NORMAL_OUTPUT)
+                        ObjVoid
+                    }
+                    lyngScope.addFn("println") {
+                        val sb = StringBuilder()
+                        for ((i, arg) in args.list.withIndex()) {
+                            if (i > 0) sb.append(" ")
+                            sb.append(arg.toString(requireScope()).value)
+                        }
+                        console.print(sb.toString() + "\n", ConsoleViewContentType.NORMAL_OUTPUT)
+                        ObjVoid
+                    }
+
+                    console.print("--- Running $fileName ---\n", ConsoleViewContentType.SYSTEM_OUTPUT)
+                    val result = lyngScope.eval(Source(fileName, text))
+                    console.print("\n--- Finished with result: ${result.inspect(lyngScope)} ---\n", ConsoleViewContentType.SYSTEM_OUTPUT)
+                } catch (t: Throwable) {
+                    console.print("\n--- Error ---\n", ConsoleViewContentType.ERROR_OUTPUT)
+                    if( t is ExecutionError ) {
+                        val m = t.errorObject.getLyngExceptionMessageWithStackTrace()
+                        console.print(m, ConsoleViewContentType.ERROR_OUTPUT)
+                    }
+                    else
+                        console.print(t.message ?: t.toString(), ConsoleViewContentType.ERROR_OUTPUT)
+                    console.print("\n", ConsoleViewContentType.ERROR_OUTPUT)
+                }
+            }
+        }
+    }
+
+    private fun getConsoleAndToolWindow(project: Project): Pair<ConsoleView, ToolWindow> {
+        val toolWindowManager = ToolWindowManager.getInstance(project)
+        var toolWindow = toolWindowManager.getToolWindow(ToolWindowId.RUN)
+        if (toolWindow == null) {
+            toolWindow = toolWindowManager.getToolWindow(ToolWindowId.MESSAGES_WINDOW)
+        }
+        if (toolWindow == null) {
+            toolWindow = toolWindowManager.getToolWindow("Lyng")
+        }
+        val actualToolWindow = toolWindow ?: run {
+            @Suppress("DEPRECATION")
+            toolWindowManager.registerToolWindow("Lyng", true, ToolWindowAnchor.BOTTOM)
+        }
+
+        val contentManager = actualToolWindow.contentManager
+        val existingContent = contentManager.findContent("Lyng Run")
+        if (existingContent != null) {
+            val console = existingContent.component as ConsoleView
+            contentManager.setSelectedContent(existingContent)
+            return console to actualToolWindow
+        }
+
+        val console = TextConsoleBuilderFactory.getInstance().createBuilder(project).console
+        val content = ContentFactory.getInstance().createContent(console.component, "Lyng Run", false)
+        contentManager.addContent(content)
+        contentManager.setSelectedContent(content)
+        return console to actualToolWindow
+    }
+}

lyng-idea/src/main/kotlin/net/sergeych/lyng/idea/annotators/LyngExternalAnnotator.kt

@@ -25,320 +25,135 @@ import com.intellij.openapi.progress.ProgressManager
 import com.intellij.openapi.util.Key
 import com.intellij.openapi.util.TextRange
 import com.intellij.psi.PsiFile
-import kotlinx.coroutines.runBlocking
-import net.sergeych.lyng.Compiler
-import net.sergeych.lyng.ScriptError
-import net.sergeych.lyng.Source
-import net.sergeych.lyng.binding.Binder
-import net.sergeych.lyng.binding.SymbolKind
 import net.sergeych.lyng.highlight.HighlightKind
-import net.sergeych.lyng.highlight.SimpleLyngHighlighter
 import net.sergeych.lyng.highlight.offsetOf
 import net.sergeych.lyng.idea.highlight.LyngHighlighterColors
-import net.sergeych.lyng.idea.util.IdeLenientImportProvider
-import net.sergeych.lyng.miniast.*
+import net.sergeych.lyng.idea.util.LyngAstManager
+import net.sergeych.lyng.tools.LyngDiagnosticSeverity
+import net.sergeych.lyng.tools.LyngLanguageTools
+import net.sergeych.lyng.tools.LyngSemanticKind
 
 /**
  * ExternalAnnotator that runs Lyng MiniAst on the document text in background
  * and applies semantic highlighting comparable with the web highlighter.
  */
 class LyngExternalAnnotator : ExternalAnnotator<LyngExternalAnnotator.Input, LyngExternalAnnotator.Result>() {
-    data class Input(val text: String, val modStamp: Long, val previousSpans: List<Span>?)
+    data class Input(val text: String, val modStamp: Long, val previousSpans: List<Span>?, val file: PsiFile)
 
     data class Span(val start: Int, val end: Int, val key: com.intellij.openapi.editor.colors.TextAttributesKey)
-    data class Error(val start: Int, val end: Int, val message: String)
-    data class Result(val modStamp: Long, val spans: List<Span>, val error: Error? = null,
-                      val spellIdentifiers: List<IntRange> = emptyList(),
-                      val spellComments: List<IntRange> = emptyList(),
-                      val spellStrings: List<IntRange> = emptyList())
+    data class Diag(val start: Int, val end: Int, val message: String, val severity: HighlightSeverity)
+    data class Result(val modStamp: Long, val spans: List<Span>, val diagnostics: List<Diag> = emptyList())
 
     override fun collectInformation(file: PsiFile): Input? {
         val doc: Document = file.viewProvider.document ?: return null
         val cached = file.getUserData(CACHE_KEY)
-        // Fast fix (1): reuse cached spans only if they were computed for the same modification stamp
-        val prev = if (cached != null && cached.modStamp == doc.modificationStamp) cached.spans else null
-        return Input(doc.text, doc.modificationStamp, prev)
+        val combinedStamp = LyngAstManager.getCombinedStamp(file)
+
+        val prev = if (cached != null && cached.modStamp == combinedStamp) cached.spans else null
+        return Input(doc.text, combinedStamp, prev, file)
     }
 
     override fun doAnnotate(collectedInfo: Input?): Result? {
         if (collectedInfo == null) return null
         ProgressManager.checkCanceled()
         val text = collectedInfo.text
-        // Build Mini-AST using the same mechanism as web highlighter
-        val sink = MiniAstBuilder()
-        val source = Source("<ide>", text)
-        try {
-            // Call suspend API from blocking context
-            val provider = IdeLenientImportProvider.create()
-            runBlocking { Compiler.compileWithMini(source, provider, sink) }
-        } catch (e: Throwable) {
-            if (e is com.intellij.openapi.progress.ProcessCanceledException) throw e
-            // On script parse error: keep previous spans and report the error location
-            if (e is ScriptError) {
-                val off = try { source.offsetOf(e.pos) } catch (_: Throwable) { -1 }
-                val start0 = off.coerceIn(0, text.length.coerceAtLeast(0))
-                val (start, end) = expandErrorRange(text, start0)
-                // Fast fix (5): clear cached highlighting after the error start position
-                val trimmed = collectedInfo.previousSpans?.filter { it.end <= start } ?: emptyList()
-                return Result(
-                    collectedInfo.modStamp,
-                    trimmed,
-                    Error(start, end, e.errorMessage)
-                )
-            }
-            // Other failures: keep previous spans without error
-            return Result(collectedInfo.modStamp, collectedInfo.previousSpans ?: emptyList(), null)
-        }
+        val analysis = LyngAstManager.getAnalysis(collectedInfo.file)
+            ?: return Result(collectedInfo.modStamp, collectedInfo.previousSpans ?: emptyList())
+        val mini = analysis.mini
+
         ProgressManager.checkCanceled()
-        val mini = sink.build() ?: return Result(collectedInfo.modStamp, collectedInfo.previousSpans ?: emptyList())
 
         val out = ArrayList<Span>(256)
+        val diags = ArrayList<Diag>()
 
         fun putRange(start: Int, end: Int, key: com.intellij.openapi.editor.colors.TextAttributesKey) {
             if (start in 0..end && end <= text.length && start < end) out += Span(start, end, key)
         }
-        fun putName(startPos: net.sergeych.lyng.Pos, name: String, key: com.intellij.openapi.editor.colors.TextAttributesKey) {
-            val s = source.offsetOf(startPos)
-            putRange(s, (s + name.length).coerceAtMost(text.length), key)
-        }
-        fun putMiniRange(r: MiniRange, key: com.intellij.openapi.editor.colors.TextAttributesKey) {
-            val s = source.offsetOf(r.start)
-            val e = source.offsetOf(r.end)
-            putRange(s, e, key)
+
+        fun keyForKind(kind: LyngSemanticKind): com.intellij.openapi.editor.colors.TextAttributesKey? = when (kind) {
+            LyngSemanticKind.Function -> LyngHighlighterColors.FUNCTION
+            LyngSemanticKind.Class, LyngSemanticKind.Enum, LyngSemanticKind.TypeAlias -> LyngHighlighterColors.TYPE
+            LyngSemanticKind.Value -> LyngHighlighterColors.VALUE
+            LyngSemanticKind.Variable -> LyngHighlighterColors.VARIABLE
+            LyngSemanticKind.Parameter -> LyngHighlighterColors.PARAMETER
+            LyngSemanticKind.TypeRef -> LyngHighlighterColors.TYPE
+            LyngSemanticKind.EnumConstant -> LyngHighlighterColors.ENUM_CONSTANT
         }
 
-        // Declarations
-        for (d in mini.declarations) {
-            when (d) {
-                is MiniFunDecl -> putName(d.nameStart, d.name, LyngHighlighterColors.FUNCTION_DECLARATION)
-                is MiniClassDecl -> putName(d.nameStart, d.name, LyngHighlighterColors.TYPE)
-                is MiniValDecl -> putName(
-                    d.nameStart,
-                    d.name,
-                    if (d.mutable) LyngHighlighterColors.VARIABLE else LyngHighlighterColors.VALUE
-                )
-                is MiniEnumDecl -> putName(d.nameStart, d.name, LyngHighlighterColors.TYPE)
-            }
+        // Semantic highlights from shared tooling
+        LyngLanguageTools.semanticHighlights(analysis).forEach { span ->
+            keyForKind(span.kind)?.let { putRange(span.range.start, span.range.endExclusive, it) }
         }
 
         // Imports: each segment as namespace/path
-        for (imp in mini.imports) {
-            for (seg in imp.segments) putMiniRange(seg.range, LyngHighlighterColors.NAMESPACE)
-        }
-
-        // Parameters
-        for (fn in mini.declarations.filterIsInstance<MiniFunDecl>()) {
-            for (p in fn.params) putName(p.nameStart, p.name, LyngHighlighterColors.PARAMETER)
-        }
-
-        // Type name segments (including generics base & args)
-        fun addTypeSegments(t: MiniTypeRef?) {
-            when (t) {
-                is MiniTypeName -> t.segments.forEach { seg ->
-                    val s = source.offsetOf(seg.range.start)
-                    putRange(s, (s + seg.name.length).coerceAtMost(text.length), LyngHighlighterColors.TYPE)
-                }
-                is MiniGenericType -> {
-                    addTypeSegments(t.base)
-                    t.args.forEach { addTypeSegments(it) }
-                }
-                is MiniFunctionType -> {
-                    t.receiver?.let { addTypeSegments(it) }
-                    t.params.forEach { addTypeSegments(it) }
-                    addTypeSegments(t.returnType)
-                }
-                is MiniTypeVar -> { /* name is in range; could be highlighted as TYPE as well */
-                    putMiniRange(t.range, LyngHighlighterColors.TYPE)
-                }
-                null -> {}
-            }
-        }
-        for (d in mini.declarations) {
-            when (d) {
-                is MiniFunDecl -> {
-                    addTypeSegments(d.returnType)
-                    d.params.forEach { addTypeSegments(it.type) }
-                    addTypeSegments(d.receiver)
-                }
-                is MiniValDecl -> {
-                    addTypeSegments(d.type)
-                    addTypeSegments(d.receiver)
-                }
-                is MiniClassDecl -> {
-                    d.ctorFields.forEach { addTypeSegments(it.type) }
-                    d.classFields.forEach { addTypeSegments(it.type) }
-                }
-                is MiniEnumDecl -> {}
+        mini?.imports?.forEach { imp ->
+            imp.segments.forEach { seg ->
+                val start = analysis.source.offsetOf(seg.range.start)
+                val end = analysis.source.offsetOf(seg.range.end)
+                putRange(start, end, LyngHighlighterColors.NAMESPACE)
             }
         }
 
-        ProgressManager.checkCanceled()
-
-        // Semantic usages via Binder (best-effort)
-        try {
-            val binding = Binder.bind(text, mini)
-
-            // Map declaration ranges to avoid duplicating them as usages
-            val declKeys = HashSet<Pair<Int, Int>>(binding.symbols.size * 2)
-            for (sym in binding.symbols) declKeys += (sym.declStart to sym.declEnd)
-
-            fun keyForKind(k: SymbolKind) = when (k) {
-                SymbolKind.Function -> LyngHighlighterColors.FUNCTION
-                SymbolKind.Class, SymbolKind.Enum -> LyngHighlighterColors.TYPE
-                SymbolKind.Parameter -> LyngHighlighterColors.PARAMETER
-                SymbolKind.Value -> LyngHighlighterColors.VALUE
-                SymbolKind.Variable -> LyngHighlighterColors.VARIABLE
-            }
-
-            // Track covered ranges to not override later heuristics
-            val covered = HashSet<Pair<Int, Int>>()
-
-            for (ref in binding.references) {
-                val key = ref.start to ref.end
-                if (declKeys.contains(key)) continue
-                val sym = binding.symbols.firstOrNull { it.id == ref.symbolId } ?: continue
-                val color = keyForKind(sym.kind)
-                putRange(ref.start, ref.end, color)
-                covered += key
-            }
-
-            // Heuristics on top of binder: function call-sites and simple name-based roles
-            ProgressManager.checkCanceled()
-
-            val tokens = try { SimpleLyngHighlighter().highlight(text) } catch (_: Throwable) { emptyList() }
-
-            fun isFollowedByParenOrBlock(rangeEnd: Int): Boolean {
-                var i = rangeEnd
-                while (i < text.length) {
-                    val ch = text[i]
-                    if (ch == ' ' || ch == '\t' || ch == '\r' || ch == '\n') { i++; continue }
-                    return ch == '(' || ch == '{'
-                }
-                return false
-            }
-
-            // Build simple name -> role map for top-level vals/vars and parameters
-            val nameRole = HashMap<String, com.intellij.openapi.editor.colors.TextAttributesKey>(8)
-            for (d in mini.declarations) when (d) {
-                is MiniValDecl -> nameRole[d.name] = if (d.mutable) LyngHighlighterColors.VARIABLE else LyngHighlighterColors.VALUE
-                is MiniFunDecl -> d.params.forEach { p -> nameRole[p.name] = LyngHighlighterColors.PARAMETER }
-                else -> {}
-            }
-
-            for (s in tokens) if (s.kind == HighlightKind.Identifier) {
-                val start = s.range.start
-                val end = s.range.endExclusive
-                val key = start to end
-                if (key in covered || key in declKeys) continue
-
-                // Call-site detection first so it wins over var/param role
-                if (isFollowedByParenOrBlock(end)) {
-                    putRange(start, end, LyngHighlighterColors.FUNCTION)
-                    covered += key
-                    continue
-                }
-
-                // Simple role by known names
-                val ident = try { text.substring(start, end) } catch (_: Throwable) { null }
-                if (ident != null) {
-                    val roleKey = nameRole[ident]
-                    if (roleKey != null) {
-                        putRange(start, end, roleKey)
-                        covered += key
-                    }
-                }
-            }
-        } catch (e: Throwable) {
-            // Must rethrow cancellation; otherwise ignore binder failures (best-effort)
-            if (e is com.intellij.openapi.progress.ProcessCanceledException) throw e
-        }
-
-        // Add annotation coloring using token highlighter (treat @Label as annotation)
+        // Add annotation/label coloring using token highlighter
         run {
-            val tokens = try { SimpleLyngHighlighter().highlight(text) } catch (_: Throwable) { emptyList() }
-            for (s in tokens) if (s.kind == HighlightKind.Label) {
+            analysis.lexicalHighlights.forEach { s ->
+                if (s.kind == HighlightKind.Label) {
                     val start = s.range.start
                     val end = s.range.endExclusive
                     if (start in 0..end && end <= text.length && start < end) {
-                    val lexeme = try { text.substring(start, end) } catch (_: Throwable) { null }
-                    if (lexeme != null && lexeme.startsWith("@")) {
+                        val lexeme = try {
+                            text.substring(start, end)
+                        } catch (_: Throwable) {
+                            null
+                        }
+                        if (lexeme != null) {
+                            // Heuristic: if it starts with @ and follows a control keyword, it's likely a label
+                            // Otherwise if it starts with @ it's an annotation.
+                            // If it ends with @ it's a loop label.
+                            when {
+                                lexeme.endsWith("@") -> putRange(start, end, LyngHighlighterColors.LABEL)
+                                lexeme.startsWith("@") -> {
+                                    // Try to see if it's an exit label
+                                    val prevNonWs = prevNonWs(text, start)
+                                    val prevWord = if (prevNonWs >= 0) {
+                                        var wEnd = prevNonWs + 1
+                                        var wStart = prevNonWs
+                                        while (wStart > 0 && text[wStart - 1].isLetter()) wStart--
+                                        text.substring(wStart, wEnd)
+                                    } else null
+
+                                    if (prevWord in setOf("return", "break", "continue")) {
+                                        putRange(start, end, LyngHighlighterColors.LABEL)
+                                    } else {
                                         putRange(start, end, LyngHighlighterColors.ANNOTATION)
                                     }
                                 }
                             }
                         }
-
-        // Map Enum constants from token highlighter to IDEA enum constant color
-        run {
-            val tokens = try { SimpleLyngHighlighter().highlight(text) } catch (_: Throwable) { emptyList() }
-            for (s in tokens) if (s.kind == HighlightKind.EnumConstant) {
-                val start = s.range.start
-                val end = s.range.endExclusive
-                if (start in 0..end && end <= text.length && start < end) {
-                    putRange(start, end, LyngHighlighterColors.ENUM_CONSTANT)
+                    }
                 }
             }
         }
 
-        // Build spell index payload: identifiers from symbols + references; comments/strings from simple highlighter
-        val idRanges = mutableSetOf<IntRange>()
-        try {
-            val binding = Binder.bind(text, mini)
-            for (sym in binding.symbols) {
-                val s = sym.declStart; val e = sym.declEnd
-                if (s in 0..e && e <= text.length && s < e) idRanges += (s until e)
+        analysis.diagnostics.forEach { d ->
+            val range = d.range ?: return@forEach
+            val severity = if (d.severity == LyngDiagnosticSeverity.Warning) HighlightSeverity.WARNING else HighlightSeverity.ERROR
+            diags += Diag(range.start, range.endExclusive, d.message, severity)
         }
-            for (ref in binding.references) {
-                val s = ref.start; val e = ref.end
-                if (s in 0..e && e <= text.length && s < e) idRanges += (s until e)
-            }
-        } catch (_: Throwable) {
-            // Best-effort; no identifiers if binder fails
-        }
-        val tokens = try { SimpleLyngHighlighter().highlight(text) } catch (_: Throwable) { emptyList() }
-        val commentRanges = tokens.filter { it.kind == HighlightKind.Comment }.map { it.range.start until it.range.endExclusive }
-        val stringRanges = tokens.filter { it.kind == HighlightKind.String }.map { it.range.start until it.range.endExclusive }
 
-        return Result(collectedInfo.modStamp, out, null,
-            spellIdentifiers = idRanges.toList(),
-            spellComments = commentRanges,
-            spellStrings = stringRanges)
+        return Result(collectedInfo.modStamp, out, diags)
     }
 
+
     override fun apply(file: PsiFile, annotationResult: Result?, holder: AnnotationHolder) {
         if (annotationResult == null) return
         // Skip if cache is up-to-date
-        val doc = file.viewProvider.document
-        val currentStamp = doc?.modificationStamp
+        val combinedStamp = LyngAstManager.getCombinedStamp(file)
         val cached = file.getUserData(CACHE_KEY)
-        val result = if (cached != null && currentStamp != null && cached.modStamp == currentStamp) cached else annotationResult
+        val result = if (cached != null && cached.modStamp == combinedStamp) cached else annotationResult
         file.putUserData(CACHE_KEY, result)
 
-        // Store spell index for spell/grammar engines to consume (suspend until ready)
-        val ids = result.spellIdentifiers.map { TextRange(it.first, it.last + 1) }
-        val coms = result.spellComments.map { TextRange(it.first, it.last + 1) }
-        val strs = result.spellStrings.map { TextRange(it.first, it.last + 1) }
-        net.sergeych.lyng.idea.spell.LyngSpellIndex.store(file,
-            net.sergeych.lyng.idea.spell.LyngSpellIndex.Data(
-                modStamp = result.modStamp,
-                identifiers = ids,
-                comments = coms,
-                strings = strs
-            )
-        )
-
-        // Optional diagnostic overlay: visualize the ranges we will feed to spellcheckers
-        val settings = net.sergeych.lyng.idea.settings.LyngFormatterSettings.getInstance(file.project)
-        if (settings.debugShowSpellFeed) {
-            fun paint(r: TextRange, label: String) {
-                holder.newAnnotation(HighlightSeverity.WEAK_WARNING, "spell-feed: $label")
-                    .range(r)
-                    .create()
-            }
-            ids.forEach { paint(it, "id") }
-            coms.forEach { paint(it, "comment") }
-            if (settings.spellCheckStringLiterals) strs.forEach { paint(it, "string") }
-        }
+        val doc = file.viewProvider.document
 
         for (s in result.spans) {
             holder.newSilentAnnotation(HighlightSeverity.INFORMATION)
@@ -347,13 +162,12 @@ class LyngExternalAnnotator : ExternalAnnotator<LyngExternalAnnotator.Input, Lyn
                 .create()
         }
 
-        // Show syntax error if present
-        val err = result.error
-        if (err != null) {
-            val start = err.start.coerceIn(0, (doc?.textLength ?: 0))
-            val end = err.end.coerceIn(start, (doc?.textLength ?: start))
+        // Show errors and warnings
+        result.diagnostics.forEach { d ->
+            val start = d.start.coerceIn(0, (doc?.textLength ?: 0))
+            val end = d.end.coerceIn(start, (doc?.textLength ?: start))
             if (end > start) {
-                holder.newAnnotation(HighlightSeverity.ERROR, err.message)
+                holder.newAnnotation(d.severity, d.message)
                     .range(TextRange(start, end))
                     .create()
             }
@@ -364,30 +178,15 @@ class LyngExternalAnnotator : ExternalAnnotator<LyngExternalAnnotator.Input, Lyn
         private val CACHE_KEY: Key<Result> = Key.create("LYNG_SEMANTIC_CACHE")
     }
 
-    /**
-     * Make the error highlight a bit wider than a single character so it is easier to see and click.
-     * Strategy:
-     *  - If the offset points inside an identifier-like token (letters/digits/underscore), expand to the full token.
-     *  - Otherwise select a small range starting at the offset with a minimum width, but not crossing the line end.
-     */
-    private fun expandErrorRange(text: String, rawStart: Int): Pair<Int, Int> {
-        if (text.isEmpty()) return 0 to 0
-        val len = text.length
-        val start = rawStart.coerceIn(0, len)
-        fun isWord(ch: Char) = ch == '_' || ch.isLetterOrDigit()
-
-        if (start < len && isWord(text[start])) {
-            var s = start
-            var e = start
-            while (s > 0 && isWord(text[s - 1])) s--
-            while (e < len && isWord(text[e])) e++
-            return s to e
+    private fun prevNonWs(text: String, idxExclusive: Int): Int {
+        var i = idxExclusive - 1
+        while (i >= 0) {
+            val ch = text[i]
+            if (ch != ' ' && ch != '\t' && ch != '\n' && ch != '\r') return i
+            i--
+        }
+        return -1
     }
 
-        // Not inside a word: select a short, visible range up to EOL
-        val lineEnd = text.indexOf('\n', start).let { if (it == -1) len else it }
-        val minWidth = 4
-        val end = (start + minWidth).coerceAtMost(lineEnd).coerceAtLeast((start + 1).coerceAtMost(lineEnd))
-        return start to end
-    }
+    
 }

lyng-idea/src/main/kotlin/net/sergeych/lyng/idea/completion/LyngCompletionContributor.kt

@@ -30,7 +30,6 @@ import com.intellij.patterns.PlatformPatterns
 import com.intellij.psi.PsiFile
 import com.intellij.util.ProcessingContext
 import kotlinx.coroutines.runBlocking
-import net.sergeych.lyng.highlight.offsetOf
 import net.sergeych.lyng.idea.LyngLanguage
 import net.sergeych.lyng.idea.highlight.LyngTokenTypes
 import net.sergeych.lyng.idea.settings.LyngFormatterSettings
@@ -97,13 +96,14 @@ class LyngCompletionContributor : CompletionContributor() {
                 log.info("[LYNG_DEBUG] Completion: caret=$caret prefix='${prefix}' memberDotPos=${memberDotPos} file='${file.name}'")
             }
 
-            // Build MiniAst (cached) for both global and member contexts to enable local class/val inference
-            val mini = LyngAstManager.getMiniAst(file)
-            val binding = LyngAstManager.getBinding(file)
+            // Build analysis (cached) for both global and member contexts to enable local class/val inference
+            val analysis = LyngAstManager.getAnalysis(file)
+            val mini = analysis?.mini
+            val binding = analysis?.binding
 
             // Delegate computation to the shared engine to keep behavior in sync with tests
             val engineItems = try {
-                runBlocking { CompletionEngineLight.completeSuspend(text, caret) }
+                runBlocking { CompletionEngineLight.completeSuspend(text, caret, mini, binding) }
             } catch (t: Throwable) {
                 if (DEBUG_COMPLETION) log.warn("[LYNG_DEBUG] Engine completion failed: ${t.message}")
                 emptyList()
@@ -117,11 +117,12 @@ class LyngCompletionContributor : CompletionContributor() {
             if (memberDotPos != null && engineItems.isEmpty()) {
                 if (DEBUG_COMPLETION) log.info("[LYNG_DEBUG] Fallback: engine returned 0 in member context; trying local inference")
                 // Build imported modules from text (lenient) + stdlib; avoid heavy MiniAst here
-                val fromText = extractImportsFromText(text)
+                val fromText = DocLookupUtils.extractImportsFromText(text)
                 val imported = LinkedHashSet<String>().apply {
                     fromText.forEach { add(it) }
                     add("lyng.stdlib")
                 }.toList()
+                val staticOnly = DocLookupUtils.isStaticReceiver(mini, text, memberDotPos, imported, binding)
 
                 // Try inferring return/receiver class around the dot
                 val inferred =
@@ -136,7 +137,7 @@ class LyngCompletionContributor : CompletionContributor() {
 
                 if (inferred != null) {
                     if (DEBUG_COMPLETION) log.info("[LYNG_DEBUG] Fallback inferred receiver/return class='$inferred' — offering its members")
-                    offerMembers(emit, imported, inferred, sourceText = text, mini = mini)
+                    offerMembers(emit, imported, inferred, staticOnly = staticOnly, sourceText = text, mini = mini)
                     return
                 } else {
                     if (DEBUG_COMPLETION) log.info("[LYNG_DEBUG] Fallback could not infer class; keeping list empty (no globals after dot)")
@@ -144,11 +145,6 @@ class LyngCompletionContributor : CompletionContributor() {
                 }
             }
 
-            // In global context, add params in scope first (engine does not include them)
-            if (memberDotPos == null && mini != null) {
-                offerParamsInScope(emit, mini, text, caret)
-            }
-
             // Render engine items
             for (ci in engineItems) {
                 val builder = when (ci.kind) {
@@ -166,19 +162,25 @@ class LyngCompletionContributor : CompletionContributor() {
                         .withIcon(AllIcons.Nodes.Class)
                     Kind.Enum -> LookupElementBuilder.create(ci.name)
                         .withIcon(AllIcons.Nodes.Enum)
+                    Kind.TypeAlias -> LookupElementBuilder.create(ci.name)
+                        .withIcon(AllIcons.Nodes.Class)
                     Kind.Value -> LookupElementBuilder.create(ci.name)
-                        .withIcon(AllIcons.Nodes.Field)
+                        .withIcon(AllIcons.Nodes.Variable)
                         .let { b -> if (!ci.typeText.isNullOrBlank()) b.withTypeText(ci.typeText, true) else b }
                     Kind.Field -> LookupElementBuilder.create(ci.name)
                         .withIcon(AllIcons.Nodes.Field)
                         .let { b -> if (!ci.typeText.isNullOrBlank()) b.withTypeText(ci.typeText, true) else b }
                 }
+                if (ci.priority != 0.0) {
+                    emit(PrioritizedLookupElement.withPriority(builder, ci.priority))
+                } else {
                     emit(builder)
                 }
+            }
             // In member context, ensure stdlib extension-like methods (e.g., String.re) are present
             if (memberDotPos != null) {
                 val existing = engineItems.map { it.name }.toMutableSet()
-                val fromText = extractImportsFromText(text)
+                val fromText = DocLookupUtils.extractImportsFromText(text)
                 val imported = LinkedHashSet<String>().apply {
                     fromText.forEach { add(it) }
                     add("lyng.stdlib")
@@ -191,33 +193,51 @@ class LyngCompletionContributor : CompletionContributor() {
                         ?: DocLookupUtils.guessReturnClassAcrossKnownCallees(text, memberDotPos, imported, mini)
                         ?: DocLookupUtils.guessReceiverClass(text, memberDotPos, imported, mini)
                 if (!inferredClass.isNullOrBlank()) {
-                    val ext = BuiltinDocRegistry.extensionMemberNamesFor(inferredClass)
-                    if (DEBUG_COMPLETION) log.info("[LYNG_DEBUG] Post-engine extension check for $inferredClass: ${'$'}{ext}")
+                    val ext = DocLookupUtils.collectExtensionMemberNames(imported, inferredClass, mini)
+                    if (DEBUG_COMPLETION) log.info("[LYNG_DEBUG] Post-engine extension check for $inferredClass: ${ext}")
                     for (name in ext) {
                         if (existing.contains(name)) continue
                         val resolved = DocLookupUtils.resolveMemberWithInheritance(imported, inferredClass, name, mini)
                         if (resolved != null) {
-                            when (val member = resolved.second) {
+                            val m = resolved.second
+                            val builder = when (m) {
                                 is MiniMemberFunDecl -> {
-                                    val params = member.params.joinToString(", ") { it.name }
-                                    val ret = typeOf(member.returnType)
-                                    val builder = LookupElementBuilder.create(name)
+                                    val params = m.params.joinToString(", ") { it.name }
+                                    val ret = typeOf(m.returnType)
+                                    LookupElementBuilder.create(name)
                                         .withIcon(AllIcons.Nodes.Method)
-                                        .withTailText("(${ '$' }params)", true)
+                                        .withTailText("($params)", true)
+                                        .withTypeText(ret, true)
+                                        .withInsertHandler(ParenInsertHandler)
+                                }
+                                is MiniFunDecl -> {
+                                    val params = m.params.joinToString(", ") { it.name }
+                                    val ret = typeOf(m.returnType)
+                                    LookupElementBuilder.create(name)
+                                        .withIcon(AllIcons.Nodes.Method)
+                                        .withTailText("($params)", true)
                                         .withTypeText(ret, true)
                                         .withInsertHandler(ParenInsertHandler)
-                                    emit(builder)
-                                    existing.add(name)
                                 }
                                 is MiniMemberValDecl -> {
-                                    val builder = LookupElementBuilder.create(name)
-                                        .withIcon(if (member.mutable) AllIcons.Nodes.Variable else AllIcons.Nodes.Field)
-                                        .withTypeText(typeOf(member.type), true)
+                                    LookupElementBuilder.create(name)
+                                        .withIcon(if (m.mutable) AllIcons.Nodes.Variable else AllIcons.Nodes.Field)
+                                        .withTypeText(typeOf(m.type), true)
+                                }
+                                is MiniValDecl -> {
+                                    LookupElementBuilder.create(name)
+                                        .withIcon(if (m.mutable) AllIcons.Nodes.Variable else AllIcons.Nodes.Field)
+                                        .withTypeText(typeOf(m.type), true)
+                                }
+                                else -> {
+                                    LookupElementBuilder.create(name)
+                                        .withIcon(AllIcons.Nodes.Method)
+                                        .withTailText("()", true)
+                                        .withInsertHandler(ParenInsertHandler)
+                                }
+                            }
                             emit(builder)
                             existing.add(name)
-                                }
-                                is MiniInitDecl -> {}
-                            }
                         } else {
                             // Fallback: emit simple method name without detailed types
                             val builder = LookupElementBuilder.create(name)
@@ -233,7 +253,7 @@ class LyngCompletionContributor : CompletionContributor() {
             // If in member context and engine items are suspiciously sparse, try to enrich via local inference + offerMembers
             if (memberDotPos != null && engineItems.size < 3) {
                 if (DEBUG_COMPLETION) log.info("[LYNG_DEBUG] Engine produced only ${engineItems.size} items in member context — trying enrichment")
-                val fromText = extractImportsFromText(text)
+                val fromText = DocLookupUtils.extractImportsFromText(text)
                 val imported = LinkedHashSet<String>().apply {
                     fromText.forEach { add(it) }
                     add("lyng.stdlib")
@@ -276,6 +296,9 @@ class LyngCompletionContributor : CompletionContributor() {
                 }
                 is MiniEnumDecl -> LookupElementBuilder.create(name)
                     .withIcon(AllIcons.Nodes.Enum)
+                is MiniTypeAliasDecl -> LookupElementBuilder.create(name)
+                    .withIcon(AllIcons.Nodes.Class)
+                    .withTypeText(typeOf(d.target), true)
             }
             emit(builder)
         }
@@ -353,6 +376,7 @@ class LyngCompletionContributor : CompletionContributor() {
                         when (m) {
                             is MiniMemberFunDecl -> if (!m.isStatic) continue
                             is MiniMemberValDecl -> if (!m.isStatic) continue
+                            is MiniMemberTypeAliasDecl -> if (!m.isStatic) continue
                             is MiniInitDecl -> continue
                         }
                     }
@@ -389,17 +413,22 @@ class LyngCompletionContributor : CompletionContributor() {
             }
             supplementPreferredBases(className)
 
-            fun emitGroup(map: LinkedHashMap<String, MutableList<MiniMemberDecl>>) {
+            fun emitGroup(map: LinkedHashMap<String, MutableList<MiniMemberDecl>>, groupPriority: Double) {
                 val keys = map.keys.sortedBy { it.lowercase() }
                 for (name in keys) {
                     val list = map[name] ?: continue
                     // Choose a representative for display:
-                    // 1) Prefer a method with a known return type
-                    // 2) Else any method
-                    // 3) Else the first variant
+                    // 1) Prefer a method with return type AND parameters
+                    // 2) Prefer a method with parameters
+                    // 3) Prefer a method with return type
+                    // 4) Else any method
+                    // 5) Else the first variant
                     val rep =
-                        list.asSequence()
-                            .filterIsInstance<MiniMemberFunDecl>()
+                        list.asSequence().filterIsInstance<MiniMemberFunDecl>()
+                            .firstOrNull { it.returnType != null && it.params.isNotEmpty() }
+                            ?: list.asSequence().filterIsInstance<MiniMemberFunDecl>()
+                                .firstOrNull { it.params.isNotEmpty() }
+                            ?: list.asSequence().filterIsInstance<MiniMemberFunDecl>()
                                 .firstOrNull { it.returnType != null }
                             ?: list.firstOrNull { it is MiniMemberFunDecl }
                             ?: list.first()
@@ -416,8 +445,12 @@ class LyngCompletionContributor : CompletionContributor() {
                                 .withTailText(tail, true)
                                 .withTypeText(ret, true)
                                 .withInsertHandler(ParenInsertHandler)
+                            if (groupPriority != 0.0) {
+                                emit(PrioritizedLookupElement.withPriority(builder, groupPriority))
+                            } else {
                                 emit(builder)
                             }
+                        }
                         is MiniMemberValDecl -> {
                             val icon = if (rep.mutable) AllIcons.Nodes.Variable else AllIcons.Nodes.Field
                             // Prefer a field variant with known type if available
@@ -427,16 +460,30 @@ class LyngCompletionContributor : CompletionContributor() {
                             val builder = LookupElementBuilder.create(name)
                                 .withIcon(icon)
                                 .withTypeText(typeOf(chosen.type), true)
+                            if (groupPriority != 0.0) {
+                                emit(PrioritizedLookupElement.withPriority(builder, groupPriority))
+                            } else {
                                 emit(builder)
                             }
+                        }
+                        is MiniMemberTypeAliasDecl -> {
+                            val builder = LookupElementBuilder.create(name)
+                                .withIcon(AllIcons.Nodes.Class)
+                                .withTypeText(typeOf(rep.target), true)
+                            if (groupPriority != 0.0) {
+                                emit(PrioritizedLookupElement.withPriority(builder, groupPriority))
+                            } else {
+                                emit(builder)
+                            }
+                        }
                         is MiniInitDecl -> {}
                     }
                 }
             }
 
             // Emit what we have first
-            emitGroup(directMap)
-            emitGroup(inheritedMap)
+            emitGroup(directMap, 100.0)
+            emitGroup(inheritedMap, 0.0)
 
             // If suggestions are suspiciously sparse for known container classes,
             // try to conservatively supplement using a curated list resolved via docs registry.
@@ -458,30 +505,47 @@ class LyngCompletionContributor : CompletionContributor() {
                 for (name in common) {
                     if (name in already) continue
                     // Try resolve across classes first to get types/params; if it fails, emit a synthetic safe suggestion.
-                    val resolved = DocLookupUtils.findMemberAcrossClasses(imported, name)
+                    val resolved = DocLookupUtils.findMemberAcrossClasses(imported, name, mini)
                     if (resolved != null) {
                         val member = resolved.second
-                        when (member) {
+                        val builder = when (member) {
                             is MiniMemberFunDecl -> {
                                 val params = member.params.joinToString(", ") { it.name }
                                 val ret = typeOf(member.returnType)
-                                val builder = LookupElementBuilder.create(name)
+                                LookupElementBuilder.create(name)
                                     .withIcon(AllIcons.Nodes.Method)
-                                    .withTailText("(${params})", true)
+                                    .withTailText("($params)", true)
+                                    .withTypeText(ret, true)
+                                    .withInsertHandler(ParenInsertHandler)
+                            }
+                            is MiniFunDecl -> {
+                                val params = member.params.joinToString(", ") { it.name }
+                                val ret = typeOf(member.returnType)
+                                LookupElementBuilder.create(name)
+                                    .withIcon(AllIcons.Nodes.Method)
+                                    .withTailText("($params)", true)
                                     .withTypeText(ret, true)
                                     .withInsertHandler(ParenInsertHandler)
-                                emit(builder)
-                                already.add(name)
                             }
                             is MiniMemberValDecl -> {
-                                val builder = LookupElementBuilder.create(name)
-                                    .withIcon(AllIcons.Nodes.Field)
+                                LookupElementBuilder.create(name)
+                                    .withIcon(if (member.mutable) AllIcons.Nodes.Variable else AllIcons.Nodes.Field)
                                     .withTypeText(typeOf(member.type), true)
-                                emit(builder)
+                            }
+                            is MiniValDecl -> {
+                                LookupElementBuilder.create(name)
+                                    .withIcon(if (member.mutable) AllIcons.Nodes.Variable else AllIcons.Nodes.Field)
+                                    .withTypeText(typeOf(member.type), true)
+                            }
+                            else -> {
+                                LookupElementBuilder.create(name)
+                                    .withIcon(AllIcons.Nodes.Method)
+                                    .withTailText("()", true)
+                                    .withInsertHandler(ParenInsertHandler)
+                            }
+                        }
+                        emit(PrioritizedLookupElement.withPriority(builder, 50.0))
                         already.add(name)
-                            }
-                            is MiniInitDecl -> {}
-                        }
                     } else {
                         // Synthetic fallback: method without detailed params/types to improve UX in absence of docs
                         val isProperty = name in setOf("size", "length")
@@ -494,7 +558,7 @@ class LyngCompletionContributor : CompletionContributor() {
                                 .withTailText("()", true)
                                 .withInsertHandler(ParenInsertHandler)
                         }
-                        emit(builder)
+                        emit(PrioritizedLookupElement.withPriority(builder, 50.0))
                         already.add(name)
                     }
                 }
@@ -508,90 +572,64 @@ class LyngCompletionContributor : CompletionContributor() {
                 for (name in ext) {
                     if (already.contains(name)) continue
                     // Try to resolve full signature via registry first to get params and return type
-                    val resolved = DocLookupUtils.resolveMemberWithInheritance(imported, className, name)
+                    val resolved = DocLookupUtils.resolveMemberWithInheritance(imported, className, name, mini)
                     if (resolved != null) {
-                        when (val member = resolved.second) {
+                        val m = resolved.second
+                        val builder = when (m) {
                             is MiniMemberFunDecl -> {
-                                val params = member.params.joinToString(", ") { it.name }
-                                val ret = typeOf(member.returnType)
-                                val builder = LookupElementBuilder.create(name)
+                                val params = m.params.joinToString(", ") { it.name }
+                                val ret = typeOf(m.returnType)
+                                LookupElementBuilder.create(name)
                                     .withIcon(AllIcons.Nodes.Method)
-                                    .withTailText("(${params})", true)
+                                    .withTailText("($params)", true)
+                                    .withTypeText(ret, true)
+                                    .withInsertHandler(ParenInsertHandler)
+                            }
+                            is MiniFunDecl -> {
+                                val params = m.params.joinToString(", ") { it.name }
+                                val ret = typeOf(m.returnType)
+                                LookupElementBuilder.create(name)
+                                    .withIcon(AllIcons.Nodes.Method)
+                                    .withTailText("($params)", true)
                                     .withTypeText(ret, true)
                                     .withInsertHandler(ParenInsertHandler)
-                                emit(builder)
-                                already.add(name)
-                                continue
                             }
                             is MiniMemberValDecl -> {
-                                val builder = LookupElementBuilder.create(name)
-                                    .withIcon(if (member.mutable) AllIcons.Nodes.Variable else AllIcons.Nodes.Field)
-                                    .withTypeText(typeOf(member.type), true)
-                                emit(builder)
+                                LookupElementBuilder.create(name)
+                                    .withIcon(if (m.mutable) AllIcons.Nodes.Variable else AllIcons.Nodes.Field)
+                                    .withTypeText(typeOf(m.type), true)
+                            }
+                            is MiniValDecl -> {
+                                LookupElementBuilder.create(name)
+                                    .withIcon(if (m.mutable) AllIcons.Nodes.Variable else AllIcons.Nodes.Field)
+                                    .withTypeText(typeOf(m.type), true)
+                            }
+                            else -> {
+                                LookupElementBuilder.create(name)
+                                    .withIcon(AllIcons.Nodes.Method)
+                                    .withTailText("()", true)
+                                    .withInsertHandler(ParenInsertHandler)
+                            }
+                        }
+                        emit(PrioritizedLookupElement.withPriority(builder, 50.0))
                         already.add(name)
                         continue
                     }
-                            is MiniInitDecl -> {}
-                        }
-                    }
                     // Fallback: emit without detailed types if we couldn't resolve
                     val builder = LookupElementBuilder.create(name)
                         .withIcon(AllIcons.Nodes.Method)
                         .withTailText("()", true)
                         .withInsertHandler(ParenInsertHandler)
-                    emit(builder)
+                    emit(PrioritizedLookupElement.withPriority(builder, 50.0))
                     already.add(name)
                 }
             }
         }
 
-        // --- MiniAst-based inference helpers ---
-
-        private fun offerParamsInScope(emit: (com.intellij.codeInsight.lookup.LookupElement) -> Unit, mini: MiniScript, text: String, caret: Int) {
-            val src = mini.range.start.source
-            // Find function whose body contains caret or whose whole range contains caret
-            val fns = mini.declarations.filterIsInstance<MiniFunDecl>()
-            for (fn in fns) {
-                val start = src.offsetOf(fn.range.start)
-                val end = src.offsetOf(fn.range.end).coerceAtMost(text.length)
-                if (caret in start..end) {
-                    for (p in fn.params) {
-                        val builder = LookupElementBuilder.create(p.name)
-                            .withIcon(AllIcons.Nodes.Variable)
-                            .withTypeText(typeOf(p.type), true)
-                        emit(builder)
-                    }
-                    return
-                }
-            }
-        }
-
-        // Lenient textual import extractor (duplicated from QuickDoc privately)
-        private fun extractImportsFromText(text: String): List<String> {
-            val result = LinkedHashSet<String>()
-            val re = Regex("^\\s*import\\s+([a-zA-Z_][a-zA-Z0-9_]*(?:\\.[a-zA-Z_][a-zA-Z0-9_]*)*)", RegexOption.MULTILINE)
-            re.findAll(text).forEach { m ->
-                val raw = m.groupValues.getOrNull(1)?.trim().orEmpty()
-                if (raw.isNotEmpty()) {
-                    val canon = if (raw.startsWith("lyng.")) raw else "lyng.$raw"
-                    result.add(canon)
-                }
-            }
-            return result.toList()
-        }
 
         private fun typeOf(t: MiniTypeRef?): String {
-            return when (t) {
-                null -> ""
-                is MiniTypeName -> t.segments.lastOrNull()?.name?.let { ": $it" } ?: ""
-                is MiniGenericType -> {
-                    val base = typeOf(t.base).removePrefix(": ")
-                    val args = t.args.joinToString(",") { typeOf(it).removePrefix(": ") }
-                    ": ${base}<${args}>"
-                }
-                is MiniFunctionType -> ": (fn)"
-                is MiniTypeVar -> ": ${t.name}"
-            }
+            val s = DocLookupUtils.typeOf(t)
+            return if (s.isEmpty()) "" else ": $s"
         }
     }
 }

lyng-idea/src/main/kotlin/net/sergeych/lyng/idea/docs/LyngDocumentationProvider.kt

@@ -24,15 +24,13 @@ import com.intellij.openapi.editor.Editor
 import com.intellij.openapi.util.TextRange
 import com.intellij.psi.PsiElement
 import com.intellij.psi.PsiFile
-import kotlinx.coroutines.runBlocking
-import net.sergeych.lyng.Compiler
-import net.sergeych.lyng.Pos
-import net.sergeych.lyng.Source
 import net.sergeych.lyng.highlight.offsetOf
 import net.sergeych.lyng.idea.LyngLanguage
-import net.sergeych.lyng.idea.util.IdeLenientImportProvider
+import net.sergeych.lyng.idea.util.LyngAstManager
 import net.sergeych.lyng.idea.util.TextCtx
 import net.sergeych.lyng.miniast.*
+import net.sergeych.lyng.tools.LyngLanguageTools
+import net.sergeych.lyng.tools.LyngSymbolInfo
 
 /**
  * Quick Docs backed by MiniAst: when caret is on an identifier that corresponds
@@ -69,61 +67,73 @@ class LyngDocumentationProvider : AbstractDocumentationProvider() {
         val ident = text.substring(idRange.startOffset, idRange.endOffset)
         if (DEBUG_LOG) log.info("[LYNG_DEBUG] QuickDoc: ident='$ident' at ${idRange.startOffset}..${idRange.endOffset} in ${file.name}")
 
-        // Build MiniAst for this file (fast and resilient). Best-effort; on failure continue with partial AST.
-        val sink = MiniAstBuilder()
-        val provider = IdeLenientImportProvider.create()
-        val src = Source("<ide>", text)
-        val mini = try {
-            runBlocking { Compiler.compileWithMini(src, provider, sink) }
-            sink.build()
-        } catch (t: Throwable) {
-            if (DEBUG_LOG) log.warn("[LYNG_DEBUG] QuickDoc: compileWithMini produced partial AST: ${t.message}")
-            sink.build()
-        } ?: MiniScript(MiniRange(Pos(src, 1, 1), Pos(src, 1, 1)))
-        val source = src
+        // 1. Get merged mini-AST from Manager (handles local + .lyng.d merged declarations)
+        val analysis = LyngAstManager.getAnalysis(file) ?: return null
+        val mini = analysis.mini ?: return null
+        val miniSource = mini.range.start.source
+        val imported = analysis.importedModules.ifEmpty { DocLookupUtils.canonicalImportedModules(mini, text) }
+
+        // Single-source quick doc lookup
+        LyngLanguageTools.docAt(analysis, offset)?.let { info ->
+            renderDocFromInfo(info)?.let { return it }
+        }
 
         // Try resolve to: function param at position, function/class/val declaration at position
         // 1) Use unified declaration detection
         DocLookupUtils.findDeclarationAt(mini, offset, ident)?.let { (name, kind) ->
             if (DEBUG_LOG) log.info("[LYNG_DEBUG] QuickDoc: matched declaration '$name' kind=$kind")
             // Find the actual declaration object to render
-            for (d in mini.declarations) {
-                if (d.name == name && source.offsetOf(d.nameStart) <= offset && source.offsetOf(d.nameStart) + d.name.length > offset) {
-                    return renderDeclDoc(d)
+            mini.declarations.forEach { d ->
+                if (d.name == name) {
+                    val s: Int = miniSource.offsetOf(d.nameStart)
+                    if (s <= offset && s + d.name.length > offset) {
+                        return renderDeclDoc(d, text, mini, imported)
+                    }
                 }
                 // Handle members if it was a member
                 if (d is MiniClassDecl) {
-                    for (m in d.members) {
-                        if (m.name == name && source.offsetOf(m.nameStart) <= offset && source.offsetOf(m.nameStart) + m.name.length > offset) {
+                    d.members.forEach { m ->
+                        if (m.name == name) {
+                            val s: Int = miniSource.offsetOf(m.nameStart)
+                            if (s <= offset && s + m.name.length > offset) {
                                 return when (m) {
                                     is MiniMemberFunDecl -> renderMemberFunDoc(d.name, m)
                                     is MiniMemberValDecl -> renderMemberValDoc(d.name, m)
-                                is MiniInitDecl -> null
+                                    is MiniMemberTypeAliasDecl -> renderMemberTypeAliasDoc(d.name, m)
+                                    else -> null
                                 }
                             }
                         }
-                    for (cf in d.ctorFields) {
-                        if (cf.name == name && source.offsetOf(cf.nameStart) <= offset && source.offsetOf(cf.nameStart) + cf.name.length > offset) {
+                    }
+                    d.ctorFields.forEach { cf ->
+                        if (cf.name == name) {
+                            val s: Int = miniSource.offsetOf(cf.nameStart)
+                            if (s <= offset && s + cf.name.length > offset) {
                                 // Render as a member val
                                 val mv = MiniMemberValDecl(
                                     range = MiniRange(cf.nameStart, cf.nameStart), // dummy
                                     name = cf.name,
                                     mutable = cf.mutable,
                                     type = cf.type,
+                                    initRange = null,
                                     doc = null,
                                     nameStart = cf.nameStart
                                 )
                                 return renderMemberValDoc(d.name, mv)
                             }
                         }
-                    for (cf in d.classFields) {
-                        if (cf.name == name && source.offsetOf(cf.nameStart) <= offset && source.offsetOf(cf.nameStart) + cf.name.length > offset) {
+                    }
+                    d.classFields.forEach { cf ->
+                        if (cf.name == name) {
+                            val s: Int = miniSource.offsetOf(cf.nameStart)
+                            if (s <= offset && s + cf.name.length > offset) {
                                 // Render as a member val
                                 val mv = MiniMemberValDecl(
                                     range = MiniRange(cf.nameStart, cf.nameStart), // dummy
                                     name = cf.name,
                                     mutable = cf.mutable,
                                     type = cf.type,
+                                    initRange = null,
                                     doc = null,
                                     nameStart = cf.nameStart
                                 )
@@ -131,22 +141,30 @@ class LyngDocumentationProvider : AbstractDocumentationProvider() {
                             }
                         }
                     }
+                }
                 if (d is MiniEnumDecl) {
-                    if (d.entries.contains(name) && offset >= source.offsetOf(d.range.start) && offset <= source.offsetOf(d.range.end)) {
+                    if (d.entries.contains(name)) {
+                        val s: Int = miniSource.offsetOf(d.range.start)
+                        val e: Int = miniSource.offsetOf(d.range.end)
+                        if (offset >= s && offset <= e) {
                             // For enum constant, we don't have detailed docs in MiniAst yet, but we can render a title
-                        return "<div class='doc-title'>enum constant ${d.name}.${name}</div>"
+                            return renderTitle("enum constant ${d.name}.${name}")
+                        }
                     }
                 }
             }
             // Check parameters
-            for (fn in mini.declarations.filterIsInstance<MiniFunDecl>()) {
-                for (p in fn.params) {
-                    if (p.name == name && source.offsetOf(p.nameStart) <= offset && source.offsetOf(p.nameStart) + p.name.length > offset) {
+            mini.declarations.filterIsInstance<MiniFunDecl>().forEach { fn ->
+                fn.params.forEach { p ->
+                    if (p.name == name) {
+                        val s: Int = miniSource.offsetOf(p.nameStart)
+                        if (s <= offset && s + p.name.length > offset) {
                             return renderParamDoc(fn, p)
                         }
                     }
                 }
             }
+        }
 
         // 3) usages in current file via Binder (resolves local variables, parameters, and classes)
         try {
@@ -156,58 +174,73 @@ class LyngDocumentationProvider : AbstractDocumentationProvider() {
                 val sym = binding.symbols.firstOrNull { it.id == ref.symbolId }
                 if (sym != null) {
                     // Find local declaration that matches this symbol
-                    val ds = mini.declarations.firstOrNull { decl ->
-                        val s = source.offsetOf(decl.nameStart)
-                        decl.name == sym.name && s == sym.declStart
+                    var dsFound: MiniDecl? = null
+                    mini.declarations.forEach { decl ->
+                        if (decl.name == sym.name) {
+                            val sOffset: Int = miniSource.offsetOf(decl.nameStart)
+                            if (sOffset == sym.declStart) {
+                                dsFound = decl
                             }
-                    if (ds != null) return renderDeclDoc(ds)
+                        }
+                    }
+                    if (dsFound != null) return renderDeclDoc(dsFound, text, mini, imported)
 
                     // Check parameters
-                    for (fn in mini.declarations.filterIsInstance<MiniFunDecl>()) {
-                        for (p in fn.params) {
-                            val s = source.offsetOf(p.nameStart)
-                            if (p.name == sym.name && s == sym.declStart) {
+                    mini.declarations.filterIsInstance<MiniFunDecl>().forEach { fn ->
+                        fn.params.forEach { p ->
+                            if (p.name == sym.name) {
+                                val sOffset: Int = miniSource.offsetOf(p.nameStart)
+                                if (sOffset == sym.declStart) {
                                     return renderParamDoc(fn, p)
                                 }
                             }
                         }
+                    }
 
                     // Check class members (fields/functions)
-                    for (cls in mini.declarations.filterIsInstance<MiniClassDecl>()) {
-                        for (m in cls.members) {
-                            val s = source.offsetOf(m.nameStart)
-                            if (m.name == sym.name && s == sym.declStart) {
+                    mini.declarations.filterIsInstance<MiniClassDecl>().forEach { cls ->
+                        cls.members.forEach { m ->
+                            if (m.name == sym.name) {
+                                val sOffset: Int = miniSource.offsetOf(m.nameStart)
+                                if (sOffset == sym.declStart) {
                                     return when (m) {
                                         is MiniMemberFunDecl -> renderMemberFunDoc(cls.name, m)
                                         is MiniMemberValDecl -> renderMemberValDoc(cls.name, m)
-                                    is MiniInitDecl -> null
+                                        is MiniMemberTypeAliasDecl -> renderMemberTypeAliasDoc(cls.name, m)
+                                        else -> null
                                     }
                                 }
                             }
-                        for (cf in cls.ctorFields) {
-                            val s = source.offsetOf(cf.nameStart)
-                            if (cf.name == sym.name && s == sym.declStart) {
+                        }
+                        cls.ctorFields.forEach { cf ->
+                            if (cf.name == sym.name) {
+                                val sOffset: Int = miniSource.offsetOf(cf.nameStart)
+                                if (sOffset == sym.declStart) {
                                     // Render as a member val
                                     val mv = MiniMemberValDecl(
                                         range = MiniRange(cf.nameStart, cf.nameStart), // dummy
                                         name = cf.name,
                                         mutable = cf.mutable,
                                         type = cf.type,
+                                        initRange = null,
                                         doc = null,
                                         nameStart = cf.nameStart
                                     )
                                     return renderMemberValDoc(cls.name, mv)
                                 }
                             }
-                        for (cf in cls.classFields) {
-                            val s = source.offsetOf(cf.nameStart)
-                            if (cf.name == sym.name && s == sym.declStart) {
+                        }
+                        cls.classFields.forEach { cf ->
+                            if (cf.name == sym.name) {
+                                val sOffset: Int = miniSource.offsetOf(cf.nameStart)
+                                if (sOffset == sym.declStart) {
                                     // Render as a member val
                                     val mv = MiniMemberValDecl(
                                         range = MiniRange(cf.nameStart, cf.nameStart), // dummy
                                         name = cf.name,
                                         mutable = cf.mutable,
                                         type = cf.type,
+                                        initRange = null,
                                         doc = null,
                                         nameStart = cf.nameStart
                                     )
@@ -217,6 +250,7 @@ class LyngDocumentationProvider : AbstractDocumentationProvider() {
                         }
                     }
                 }
+            }
         } catch (e: Throwable) {
             if (DEBUG_LOG) log.warn("[LYNG_DEBUG] QuickDoc: local binder resolution failed: ${e.message}")
         }
@@ -260,9 +294,9 @@ class LyngDocumentationProvider : AbstractDocumentationProvider() {
                         } else null
                     }
                     else -> {
-                        val guessed = DocLookupUtils.guessClassFromCallBefore(text, dotPos, importedModules)
-                        if (guessed != null) guessed
-                        else {
+                        DocLookupUtils.guessReceiverClassViaMini(mini, text, dotPos, importedModules)
+                            ?: DocLookupUtils.guessClassFromCallBefore(text, dotPos, importedModules, mini)
+                            ?: run {
                                 // handle this@Type or as Type
                                 val i2 = TextCtx.prevNonWs(text, dotPos - 1)
                                 if (i2 >= 0) {
@@ -270,7 +304,7 @@ class LyngDocumentationProvider : AbstractDocumentationProvider() {
                                     if (identRange != null) {
                                         val id = text.substring(identRange.startOffset, identRange.endOffset)
                                         val k = TextCtx.prevNonWs(text, identRange.startOffset - 1)
-                                    if (k >= 1 && text[k] == 's' && text[k-1] == 'a' && (k-1 == 0 || !text[k-2].isLetterOrDigit())) {
+                                        if (k >= 1 && text[k] == 's' && text[k - 1] == 'a' && (k - 1 == 0 || !text[k - 2].isLetterOrDigit())) {
                                             id
                                         } else if (k >= 0 && text[k] == '@') {
                                             val k2 = TextCtx.prevNonWs(text, k - 1)
@@ -281,14 +315,21 @@ class LyngDocumentationProvider : AbstractDocumentationProvider() {
                             }
                     }
                 }
-                if (DEBUG_LOG) log.info("[LYNG_DEBUG] QuickDoc: memberCtx dotPos=${dotPos} chBeforeDot='${if (dotPos>0) text[dotPos-1] else ' '}' classGuess=${className} imports=${importedModules}")
+                if (DEBUG_LOG) log.info("[LYNG_DEBUG] QuickDoc: memberCtx dotPos=${dotPos} chBeforeDot='${if (dotPos > 0) text[dotPos - 1] else ' '}' classGuess=${className} imports=${importedModules}")
                 if (className != null) {
-                    DocLookupUtils.resolveMemberWithInheritance(importedModules, className, ident)?.let { (owner, member) ->
+                    val staticOnly = DocLookupUtils.isStaticReceiver(mini, text, dotPos, importedModules, analysis.binding)
+                    DocLookupUtils.resolveMemberWithInheritance(importedModules, className, ident, mini, staticOnly = staticOnly)?.let { (owner, member) ->
                         if (DEBUG_INHERITANCE) log.info("[LYNG_DEBUG] QuickDoc: literal/call '$ident' resolved to $owner.${member.name}")
                         return when (member) {
                             is MiniMemberFunDecl -> renderMemberFunDoc(owner, member)
                             is MiniMemberValDecl -> renderMemberValDoc(owner, member)
+                            is MiniMemberTypeAliasDecl -> renderMemberTypeAliasDoc(owner, member)
                             is MiniInitDecl -> null
+                            is MiniFunDecl -> renderDeclDoc(member, text, mini, importedModules)
+                            is MiniValDecl -> renderDeclDoc(member, text, mini, importedModules)
+                            is MiniClassDecl -> renderDeclDoc(member, text, mini, importedModules)
+                            is MiniEnumDecl -> renderDeclDoc(member, text, mini, importedModules)
+                            is MiniTypeAliasDecl -> renderDeclDoc(member, text, mini, importedModules)
                         }
                     }
                     log.info("[LYNG_DEBUG] QuickDoc: resolve failed for ${className}.${ident}")
@@ -299,7 +340,7 @@ class LyngDocumentationProvider : AbstractDocumentationProvider() {
         // 4) As a fallback, if the caret is on an identifier text that matches any declaration name, show that
         mini.declarations.firstOrNull { it.name == ident }?.let {
             log.info("[LYNG_DEBUG] QuickDoc: fallback by name '${it.name}' kind=${it::class.simpleName}")
-            return renderDeclDoc(it)
+            return renderDeclDoc(it, text, mini, imported)
         }
 
         // 4) Consult BuiltinDocRegistry for imported modules (top-level and class members)
@@ -319,13 +360,14 @@ class LyngDocumentationProvider : AbstractDocumentationProvider() {
                 if (arity != null && chosen.params.size != arity && matches.size > 1) {
                     return renderOverloads(ident, matches)
                 }
-                return renderDeclDoc(chosen)
+                return renderDeclDoc(chosen, text, mini, imported)
             }
             // Also allow values/consts
-            docs.filterIsInstance<MiniValDecl>().firstOrNull { it.name == ident }?.let { return renderDeclDoc(it) }
+            docs.filterIsInstance<MiniValDecl>().firstOrNull { it.name == ident }?.let { return renderDeclDoc(it, text, mini, imported) }
             // And classes/enums
-            docs.filterIsInstance<MiniClassDecl>().firstOrNull { it.name == ident }?.let { return renderDeclDoc(it) }
-            docs.filterIsInstance<MiniEnumDecl>().firstOrNull { it.name == ident }?.let { return renderDeclDoc(it) }
+            docs.filterIsInstance<MiniClassDecl>().firstOrNull { it.name == ident }?.let { return renderDeclDoc(it, text, mini, imported) }
+            docs.filterIsInstance<MiniEnumDecl>().firstOrNull { it.name == ident }?.let { return renderDeclDoc(it, text, mini, imported) }
+            docs.filterIsInstance<MiniTypeAliasDecl>().firstOrNull { it.name == ident }?.let { return renderDeclDoc(it, text, mini, imported) }
         }
         // Defensive fallback: if nothing found and it's a well-known stdlib function, render minimal inline docs
         if (ident == "println" || ident == "print") {
@@ -333,18 +375,26 @@ class LyngDocumentationProvider : AbstractDocumentationProvider() {
                 "Print values to the standard output and append a newline. Accepts any number of arguments." else
                 "Print values to the standard output without a trailing newline. Accepts any number of arguments."
             val title = "function $ident(values)"
-            return "<div class='doc-title'>${htmlEscape(title)}</div>" + styledMarkdown(htmlEscape(fallback))
+            return renderTitle(title) + styledMarkdown(htmlEscape(fallback))
         }
         // 4b) try class members like ClassName.member with inheritance fallback
         val lhs = previousWordBefore(text, idRange.startOffset)
         if (lhs != null && hasDotBetween(text, lhs.endOffset, idRange.startOffset)) {
             val className = text.substring(lhs.startOffset, lhs.endOffset)
-            DocLookupUtils.resolveMemberWithInheritance(importedModules, className, ident)?.let { (owner, member) ->
+            val dotPos = findDotLeft(text, idRange.startOffset)
+            val staticOnly = dotPos?.let { DocLookupUtils.isStaticReceiver(mini, text, it, importedModules, analysis.binding) } ?: false
+            DocLookupUtils.resolveMemberWithInheritance(importedModules, className, ident, mini, staticOnly = staticOnly)?.let { (owner, member) ->
                 if (DEBUG_INHERITANCE) log.info("[LYNG_DEBUG] Inheritance resolved $className.$ident to $owner.${member.name}")
                 return when (member) {
                     is MiniMemberFunDecl -> renderMemberFunDoc(owner, member)
                     is MiniMemberValDecl -> renderMemberValDoc(owner, member)
+                    is MiniMemberTypeAliasDecl -> renderMemberTypeAliasDoc(owner, member)
                     is MiniInitDecl -> null
+                    is MiniFunDecl -> renderDeclDoc(member, text, mini, importedModules)
+                    is MiniValDecl -> renderDeclDoc(member, text, mini, importedModules)
+                    is MiniClassDecl -> renderDeclDoc(member, text, mini, importedModules)
+                    is MiniEnumDecl -> renderDeclDoc(member, text, mini, importedModules)
+                    is MiniTypeAliasDecl -> renderDeclDoc(member, text, mini, importedModules)
                 }
             }
         } else {
@@ -355,15 +405,22 @@ class LyngDocumentationProvider : AbstractDocumentationProvider() {
             if (dotPos != null) {
                 val guessed = when {
                     looksLikeListLiteralBefore(text, dotPos) -> "List"
-                    else -> DocLookupUtils.guessClassFromCallBefore(text, dotPos, importedModules)
+                    else -> DocLookupUtils.guessClassFromCallBefore(text, dotPos, importedModules, mini)
                 }
                 if (guessed != null) {
-                    DocLookupUtils.resolveMemberWithInheritance(importedModules, guessed, ident)?.let { (owner, member) ->
+                    val staticOnly = DocLookupUtils.isStaticReceiver(mini, text, dotPos, importedModules, analysis.binding)
+                    DocLookupUtils.resolveMemberWithInheritance(importedModules, guessed, ident, mini, staticOnly = staticOnly)?.let { (owner, member) ->
                         if (DEBUG_INHERITANCE) log.info("[LYNG_DEBUG] Heuristic '$guessed.$ident' resolved via inheritance to $owner.${member.name}")
                         return when (member) {
                             is MiniMemberFunDecl -> renderMemberFunDoc(owner, member)
                             is MiniMemberValDecl -> renderMemberValDoc(owner, member)
+                            is MiniMemberTypeAliasDecl -> renderMemberTypeAliasDoc(owner, member)
                             is MiniInitDecl -> null
+                            is MiniFunDecl -> renderDeclDoc(member, text, mini, importedModules)
+                            is MiniValDecl -> renderDeclDoc(member, text, mini, importedModules)
+                            is MiniClassDecl -> renderDeclDoc(member, text, mini, importedModules)
+                            is MiniEnumDecl -> renderDeclDoc(member, text, mini, importedModules)
+                            is MiniTypeAliasDecl -> renderDeclDoc(member, text, mini, importedModules)
                         }
                     }
                 } else {
@@ -371,19 +428,26 @@ class LyngDocumentationProvider : AbstractDocumentationProvider() {
                     run {
                         val candidates = listOf("String", "Iterable", "Iterator", "List", "Collection", "Array", "Dict", "Regex")
                         for (c in candidates) {
-                            DocLookupUtils.resolveMemberWithInheritance(importedModules, c, ident)?.let { (owner, member) ->
+                            val staticOnly = DocLookupUtils.isStaticReceiver(mini, text, dotPos, importedModules, analysis.binding)
+                            DocLookupUtils.resolveMemberWithInheritance(importedModules, c, ident, mini, staticOnly = staticOnly)?.let { (owner, member) ->
                                 if (DEBUG_INHERITANCE) log.info("[LYNG_DEBUG] Candidate '$c.$ident' resolved via inheritance to $owner.${member.name}")
                                 return when (member) {
                                     is MiniMemberFunDecl -> renderMemberFunDoc(owner, member)
                                     is MiniMemberValDecl -> renderMemberValDoc(owner, member)
+                                    is MiniMemberTypeAliasDecl -> renderMemberTypeAliasDoc(owner, member)
                                     is MiniInitDecl -> null
+                                    is MiniFunDecl -> renderDeclDoc(member, text, mini, importedModules)
+                                    is MiniValDecl -> renderDeclDoc(member, text, mini, importedModules)
+                                    is MiniClassDecl -> renderDeclDoc(member, text, mini, importedModules)
+                                    is MiniEnumDecl -> renderDeclDoc(member, text, mini, importedModules)
+                                    is MiniTypeAliasDecl -> renderDeclDoc(member, text, mini, importedModules)
                                 }
                             }
                         }
                     }
                     // As a last resort try aggregated String members (extensions from stdlib text)
                     run {
-                        val classes = DocLookupUtils.aggregateClasses(importedModules)
+                        val classes = DocLookupUtils.aggregateClasses(importedModules, mini)
                         val stringCls = classes["String"]
                         val m = stringCls?.members?.firstOrNull { it.name == ident }
                         if (m != null) {
@@ -391,17 +455,24 @@ class LyngDocumentationProvider : AbstractDocumentationProvider() {
                             return when (m) {
                                 is MiniMemberFunDecl -> renderMemberFunDoc("String", m)
                                 is MiniMemberValDecl -> renderMemberValDoc("String", m)
+                                is MiniMemberTypeAliasDecl -> renderMemberTypeAliasDoc("String", m)
                                 is MiniInitDecl -> null
                             }
                         }
                     }
                     // Search across classes; prefer Iterable, then Iterator, then List for common ops
-                    DocLookupUtils.findMemberAcrossClasses(importedModules, ident)?.let { (owner, member) ->
+                    DocLookupUtils.findMemberAcrossClasses(importedModules, ident, mini)?.let { (owner, member) ->
                         if (DEBUG_INHERITANCE) log.info("[LYNG_DEBUG] Cross-class '$ident' resolved to $owner.${member.name}")
                         return when (member) {
                             is MiniMemberFunDecl -> renderMemberFunDoc(owner, member)
                             is MiniMemberValDecl -> renderMemberValDoc(owner, member)
+                            is MiniMemberTypeAliasDecl -> renderMemberTypeAliasDoc(owner, member)
                             is MiniInitDecl -> null
+                            is MiniFunDecl -> renderDeclDoc(member, text, mini, importedModules)
+                            is MiniValDecl -> renderDeclDoc(member, text, mini, importedModules)
+                            is MiniClassDecl -> renderDeclDoc(member, text, mini, importedModules)
+                            is MiniEnumDecl -> renderDeclDoc(member, text, mini, importedModules)
+                            is MiniTypeAliasDecl -> renderDeclDoc(member, text, mini, importedModules)
                         }
                     }
                 }
@@ -417,25 +488,39 @@ class LyngDocumentationProvider : AbstractDocumentationProvider() {
     private fun ensureExternalDocsRegistered() { @Suppress("UNUSED_EXPRESSION") externalDocsLoaded }
 
     private fun tryLoadExternalDocs(): Boolean {
-        return try {
+        var anyLoaded = false
+        try {
             // Try known registrars; ignore failures if module is absent
             val cls = Class.forName("net.sergeych.lyngio.docs.FsBuiltinDocs")
             val m = cls.getMethod("ensure")
             m.invoke(null)
             log.info("[LYNG_DEBUG] QuickDoc: external docs loaded: net.sergeych.lyngio.docs.FsBuiltinDocs.ensure() OK")
-            true
-        } catch (_: Throwable) {
+            anyLoaded = true
+        } catch (_: Throwable) {}
+
+        try {
+            val cls = Class.forName("net.sergeych.lyngio.docs.ProcessBuiltinDocs")
+            val m = cls.getMethod("ensure")
+            m.invoke(null)
+            log.info("[LYNG_DEBUG] QuickDoc: external docs loaded: net.sergeych.lyngio.docs.ProcessBuiltinDocs.ensure() OK")
+            anyLoaded = true
+        } catch (_: Throwable) {}
+
+        if (!anyLoaded) {
             // Seed a minimal plugin-local fallback so Path docs still work without lyngio
             val seeded = try {
                 FsDocsFallback.ensureOnce()
+                ProcessDocsFallback.ensureOnce()
+                true
             } catch (_: Throwable) { false }
             if (seeded) {
-                log.info("[LYNG_DEBUG] QuickDoc: external docs NOT found; seeded plugin fallback for lyng.io.fs")
+                log.info("[LYNG_DEBUG] QuickDoc: external docs NOT found; seeded plugin fallbacks")
             } else {
                 log.info("[LYNG_DEBUG] QuickDoc: external docs NOT found (lyngio absent on classpath)")
             }
-            seeded
+            return seeded
         }
+        return true
     }
 
     override fun getCustomDocumentationElement(
@@ -449,25 +534,56 @@ class LyngDocumentationProvider : AbstractDocumentationProvider() {
         return contextElement ?: file.findElementAt(targetOffset)
     }
 
-    private fun renderDeclDoc(d: MiniDecl): String {
+    private fun renderDeclDoc(d: MiniDecl, text: String, mini: MiniScript, imported: List<String>): String {
         val title = when (d) {
             is MiniFunDecl -> "function ${d.name}${signatureOf(d)}"
             is MiniClassDecl -> "class ${d.name}"
             is MiniEnumDecl -> "enum ${d.name} { ${d.entries.joinToString(", ")} }"
-            is MiniValDecl -> if (d.mutable) "var ${d.name}${typeOf(d.type)}" else "val ${d.name}${typeOf(d.type)}"
+            is MiniTypeAliasDecl -> "type ${d.name}${typeAliasSuffix(d)}"
+            is MiniValDecl -> {
+                val t = d.type ?: DocLookupUtils.inferTypeRefForVal(d, text, imported, mini)
+                val typeStr = if (t == null) ": Object?" else typeOf(t)
+                if (d.mutable) "var ${d.name}${typeStr}" else "val ${d.name}${typeStr}"
+            }
         }
-        // Show full detailed documentation, not just the summary
-        val raw = d.doc?.raw
-        val doc: String? = if (raw.isNullOrBlank()) null else MarkdownRenderer.render(raw)
         val sb = StringBuilder()
-        sb.append("<div class='doc-title'>").append(htmlEscape(title)).append("</div>")
-        if (!doc.isNullOrBlank()) sb.append(styledMarkdown(doc))
+        sb.append(renderTitle(title))
+        sb.append(renderDocBody(d.doc))
+        return sb.toString()
+    }
+
+    private fun renderDocFromInfo(info: LyngSymbolInfo): String? {
+        val kind = when (info.target.kind) {
+            net.sergeych.lyng.binding.SymbolKind.Function -> "function"
+            net.sergeych.lyng.binding.SymbolKind.Class -> "class"
+            net.sergeych.lyng.binding.SymbolKind.Enum -> "enum"
+            net.sergeych.lyng.binding.SymbolKind.TypeAlias -> "type"
+            net.sergeych.lyng.binding.SymbolKind.Value -> "val"
+            net.sergeych.lyng.binding.SymbolKind.Variable -> "var"
+            net.sergeych.lyng.binding.SymbolKind.Parameter -> "parameter"
+        }
+        val title = info.signature ?: "$kind ${info.target.name}"
+        if (title.isBlank() && info.doc == null) return null
+        val sb = StringBuilder()
+        sb.append(renderTitle(title))
+        sb.append(renderDocBody(info.doc))
         return sb.toString()
     }
 
     private fun renderParamDoc(fn: MiniFunDecl, p: MiniParam): String {
         val title = "parameter ${p.name}${typeOf(p.type)} in ${fn.name}${signatureOf(fn)}"
-        return "<div class='doc-title'>${htmlEscape(title)}</div>"
+        val sb = StringBuilder()
+        sb.append(renderTitle(title))
+
+        // Find matching @param tag
+        fn.doc?.tags?.get("param")?.forEach { tag ->
+            val parts = tag.split(Regex("\\s+"), 2)
+            if (parts.getOrNull(0) == p.name && parts.size > 1) {
+                sb.append(styledMarkdown(MarkdownRenderer.render(parts[1])))
+            }
+        }
+
+        return sb.toString()
     }
 
     private fun renderMemberFunDoc(className: String, m: MiniMemberFunDecl): String {
@@ -478,37 +594,45 @@ class LyngDocumentationProvider : AbstractDocumentationProvider() {
         val ret = typeOf(m.returnType)
         val staticStr = if (m.isStatic) "static " else ""
         val title = "${staticStr}method $className.${m.name}(${params})${ret}"
-        val raw = m.doc?.raw
-        val doc: String? = if (raw.isNullOrBlank()) null else MarkdownRenderer.render(raw)
         val sb = StringBuilder()
-        sb.append("<div class='doc-title'>").append(htmlEscape(title)).append("</div>")
-        if (!doc.isNullOrBlank()) sb.append(styledMarkdown(doc))
+        sb.append(renderTitle(title))
+        sb.append(renderDocBody(m.doc))
         return sb.toString()
     }
 
     private fun renderMemberValDoc(className: String, m: MiniMemberValDecl): String {
-        val ts = typeOf(m.type)
+        val ts = if (m.type == null) ": Object?" else typeOf(m.type)
         val kind = if (m.mutable) "var" else "val"
         val staticStr = if (m.isStatic) "static " else ""
         val title = "${staticStr}${kind} $className.${m.name}${ts}"
-        val raw = m.doc?.raw
-        val doc: String? = if (raw.isNullOrBlank()) null else MarkdownRenderer.render(raw)
         val sb = StringBuilder()
-        sb.append("<div class='doc-title'>").append(htmlEscape(title)).append("</div>")
-        if (!doc.isNullOrBlank()) sb.append(styledMarkdown(doc))
+        sb.append(renderTitle(title))
+        sb.append(renderDocBody(m.doc))
         return sb.toString()
     }
 
-    private fun typeOf(t: MiniTypeRef?): String = when (t) {
-        is MiniTypeName -> ": ${t.segments.joinToString(".") { it.name }}${if (t.nullable) "?" else ""}"
-        is MiniGenericType -> {
-            val base = typeOf(t.base).removePrefix(": ")
-            val args = t.args.joinToString(", ") { typeOf(it).removePrefix(": ") }
-            ": ${base}<${args}>${if (t.nullable) "?" else ""}"
+    private fun renderMemberTypeAliasDoc(className: String, m: MiniMemberTypeAliasDecl): String {
+        val tp = if (m.typeParams.isEmpty()) "" else "<" + m.typeParams.joinToString(", ") + ">"
+        val body = typeOf(m.target)
+        val rhs = if (body.isBlank()) "" else " = ${body.removePrefix(": ")}"
+        val staticStr = if (m.isStatic) "static " else ""
+        val title = "${staticStr}type $className.${m.name}$tp$rhs"
+        val sb = StringBuilder()
+        sb.append(renderTitle(title))
+        sb.append(renderDocBody(m.doc))
+        return sb.toString()
     }
-        is MiniFunctionType -> ": (..) -> ..${if (t.nullable) "?" else ""}"
-        is MiniTypeVar -> ": ${t.name}${if (t.nullable) "?" else ""}"
-        null -> ""
+
+    private fun typeAliasSuffix(d: MiniTypeAliasDecl): String {
+        val tp = if (d.typeParams.isEmpty()) "" else "<" + d.typeParams.joinToString(", ") + ">"
+        val body = typeOf(d.target)
+        val rhs = if (body.isBlank()) "" else " = ${body.removePrefix(": ")}"
+        return "$tp$rhs"
+    }
+
+    private fun typeOf(t: MiniTypeRef?): String {
+        val s = DocLookupUtils.typeOf(t)
+        return if (s.isEmpty()) (if (t == null) ": Object?" else "") else ": $s"
     }
 
     private fun signatureOf(fn: MiniFunDecl): String {
@@ -520,6 +644,10 @@ class LyngDocumentationProvider : AbstractDocumentationProvider() {
         return "(${params})${ret}"
     }
 
+    private fun renderTitle(title: String): String {
+        return "<div class='doc-title' style='margin-bottom: 0.8em;'>${htmlEscape(title)}</div>"
+    }
+
     private fun htmlEscape(s: String): String = buildString(s.length) {
         for (ch in s) append(
             when (ch) {
@@ -586,7 +714,7 @@ class LyngDocumentationProvider : AbstractDocumentationProvider() {
 
     private fun renderOverloads(name: String, overloads: List<MiniFunDecl>): String {
         val sb = StringBuilder()
-        sb.append("<div class='doc-title'>Overloads for ").append(htmlEscape(name)).append("</div>")
+        sb.append(renderTitle("Overloads for $name"))
         sb.append("<ul>")
         overloads.forEach { fn ->
             sb.append("<li><code>")
@@ -608,11 +736,64 @@ class LyngDocumentationProvider : AbstractDocumentationProvider() {
         return if (e > s) TextRange(s, e) else null
     }
 
+    private fun renderDocBody(doc: MiniDoc?): String {
+        if (doc == null) return ""
+        val sb = StringBuilder()
+        if (doc.raw.isNotBlank()) {
+            sb.append(styledMarkdown(MarkdownRenderer.render(doc.raw)))
+        }
+        if (doc.tags.isNotEmpty()) {
+            sb.append(renderTags(doc.tags))
+        }
+        return sb.toString()
+    }
+
+    private fun renderTags(tags: Map<String, List<String>>): String {
+        if (tags.isEmpty()) return ""
+        val sb = StringBuilder()
+        sb.append("<table class='sections'>")
+
+        fun section(title: String, list: List<String>, isKeyValue: Boolean = false) {
+            if (list.isEmpty()) return
+            sb.append("<tr><td valign='top' class='section'><p>").append(htmlEscape(title)).append(":</p></td><td valign='top'>")
+            list.forEachIndexed { index, item ->
+                if (index > 0) sb.append("<p>")
+                if (isKeyValue) {
+                    val parts = item.split(Regex("\\s+"), 2)
+                    sb.append("<code>").append(htmlEscape(parts[0])).append("</code>")
+                    if (parts.size > 1) {
+                        sb.append(" — ").append(MarkdownRenderer.render(parts[1]).removePrefix("<p>").removeSuffix("</p>"))
+                    }
+                } else {
+                    sb.append(MarkdownRenderer.render(item).removePrefix("<p>").removeSuffix("</p>"))
+                }
+            }
+            sb.append("</td></tr>")
+        }
+
+        section("Parameters", tags["param"] ?: emptyList(), isKeyValue = true)
+        section("Returns", tags["return"] ?: emptyList())
+        section("Throws", tags["throws"] ?: emptyList(), isKeyValue = true)
+
+        tags.forEach { (name, list) ->
+            if (name !in listOf("param", "return", "throws")) {
+                section(name.replaceFirstChar { if (it.isLowerCase()) it.titlecase() else it.toString() }, list)
+            }
+        }
+
+        sb.append("</table>")
+        return sb.toString()
+    }
+
     private fun previousWordBefore(text: String, offset: Int): TextRange? {
-        // skip spaces and dots to the left, but stop after hitting a non-identifier or dot boundary
+        // skip spaces and the dot to the left, but stop after hitting a non-identifier boundary
         var i = (offset - 1).coerceAtLeast(0)
-        // first, move left past spaces
-        while (i > 0 && text[i].isWhitespace()) i--
+        // skip trailing spaces
+        while (i >= 0 && text[i].isWhitespace()) i--
+        // skip the dot if present
+        if (i >= 0 && text[i] == '.') i--
+        // skip spaces before the dot
+        while (i >= 0 && text[i].isWhitespace()) i--
         // remember position to check for dot between words
         val end = i + 1
         // now find the start of the identifier

lyng-idea/src/main/kotlin/net/sergeych/lyng/idea/docs/ProcessDocsFallback.kt

@@ -0,0 +1,69 @@
+/*
+ * Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+/*
+ * Minimal fallback docs seeding for `lyng.io.process` used only inside the IDEA plugin
+ * when external docs module (lyngio) is not present on the classpath.
+ */
+package net.sergeych.lyng.idea.docs
+
+import net.sergeych.lyng.miniast.BuiltinDocRegistry
+import net.sergeych.lyng.miniast.ParamDoc
+import net.sergeych.lyng.miniast.type
+
+internal object ProcessDocsFallback {
+    @Volatile
+    private var seeded = false
+
+    fun ensureOnce(): Boolean {
+        if (seeded) return true
+        synchronized(this) {
+            if (seeded) return true
+            BuiltinDocRegistry.module("lyng.io.process") {
+                classDoc(name = "Process", doc = "Process execution and control.") {
+                    method(
+                        name = "execute",
+                        doc = "Execute a process with arguments.",
+                        params = listOf(ParamDoc("executable", type("lyng.String")), ParamDoc("args", type("lyng.List"))),
+                        returns = type("RunningProcess"),
+                        isStatic = true
+                    )
+                    method(
+                        name = "shell",
+                        doc = "Execute a command via system shell.",
+                        params = listOf(ParamDoc("command", type("lyng.String"))),
+                        returns = type("RunningProcess"),
+                        isStatic = true
+                    )
+                }
+
+                classDoc(name = "RunningProcess", doc = "Handle to a running process.") {
+                    method(name = "stdout", doc = "Get standard output stream as a Flow of lines.", returns = type("lyng.Flow"))
+                    method(name = "stderr", doc = "Get standard error stream as a Flow of lines.", returns = type("lyng.Flow"))
+                    method(name = "waitFor", doc = "Wait for the process to exit.", returns = type("lyng.Int"))
+                    method(name = "signal", doc = "Send a signal to the process.", params = listOf(ParamDoc("signal", type("lyng.String"))))
+                    method(name = "destroy", doc = "Forcefully terminate the process.")
+                }
+
+                valDoc(name = "Process", doc = "Process execution and control.", type = type("Process"))
+                valDoc(name = "RunningProcess", doc = "Handle to a running process.", type = type("RunningProcess"))
+            }
+            seeded = true
+            return true
+        }
+    }
+}

lyng-idea/src/main/kotlin/net/sergeych/lyng/idea/format/LyngFormattingModelBuilder.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2025 Sergey S. Chernov real.sergeych@gmail.com
+ * Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -42,7 +42,7 @@ private class LineBlocksRootBlock(
     private val file: PsiFile,
     private val settings: CodeStyleSettings
 ) : Block {
-    override fun getTextRange(): TextRange = file.textRange
+    override fun getTextRange(): TextRange = TextRange(0, file.textLength)
 
     override fun getSubBlocks(): List<Block> = emptyList()
 
@@ -52,7 +52,7 @@ private class LineBlocksRootBlock(
     override fun getSpacing(child1: Block?, child2: Block): Spacing? = null
     override fun getChildAttributes(newChildIndex: Int): ChildAttributes = ChildAttributes(Indent.getNoneIndent(), null)
     override fun isIncomplete(): Boolean = false
-    override fun isLeaf(): Boolean = false
+    override fun isLeaf(): Boolean = true
 }
 
 // Intentionally no sub-blocks/spacing: indentation is handled by PreFormatProcessor + LineIndentProvider

lyng-idea/src/main/kotlin/net/sergeych/lyng/idea/format/LyngPreFormatProcessor.kt

@@ -44,25 +44,67 @@ class LyngPreFormatProcessor : PreFormatProcessor {
         // When both spacing and wrapping are OFF, still fix indentation for the whole file to
         // guarantee visible changes on Reformat Code.
         val runFullFileIndent = !settings.enableSpacing && !settings.enableWrapping
-        // Maintain a working range and a modification flag to avoid stale offsets after replacements
         var modified = false
-        fun fullRange(): TextRange = TextRange(0, doc.textLength)
-        var workingRange: TextRange = range.intersection(fullRange()) ?: fullRange()
 
-        val startLine = if (runFullFileIndent) 0 else doc.getLineNumber(workingRange.startOffset)
-        val endLine = if (runFullFileIndent) (doc.lineCount - 1).coerceAtLeast(0)
-        else doc.getLineNumber(workingRange.endOffset.coerceAtMost(doc.textLength))
+        val docW = doc as? com.intellij.injected.editor.DocumentWindow
+        // The host range of the entire injected fragment (or the whole file if not injected).
+        fun currentHostRange(): TextRange = if (docW != null) {
+            TextRange(docW.injectedToHost(0), docW.injectedToHost(doc.textLength))
+        } else {
+            file.textRange
+        }
+
+        // The range in 'doc' coordinate system (local 0..len for injections, host offsets for normal files).
+        fun currentLocalRange(): TextRange = if (docW != null) {
+            TextRange(0, doc.textLength)
+        } else {
+            file.textRange
+        }
+
+        val clr = currentLocalRange()
+        val chr = currentHostRange()
+
+        // Convert the input range to the coordinate system of 'doc'
+        var workingRangeLocal: TextRange = if (docW != null) {
+            val hostIntersection = range.intersection(chr)
+            if (hostIntersection != null) {
+                try {
+                    val start = docW.hostToInjected(hostIntersection.startOffset)
+                    val end = docW.hostToInjected(hostIntersection.endOffset)
+                    TextRange(start.coerceAtMost(end), end.coerceAtLeast(start))
+                } catch (e: Exception) {
+                    clr
+                }
+            } else {
+                range.intersection(clr) ?: clr
+            }
+        } else {
+            range.intersection(clr) ?: clr
+        }
+
+        val startLine = if (runFullFileIndent) {
+            doc.getLineNumber(currentLocalRange().startOffset)
+        } else {
+            doc.getLineNumber(workingRangeLocal.startOffset)
+        }
+        val endLine = if (runFullFileIndent) {
+            if (clr.endOffset <= clr.startOffset) doc.getLineNumber(clr.startOffset)
+            else doc.getLineNumber(clr.endOffset)
+        } else {
+            doc.getLineNumber(workingRangeLocal.endOffset.coerceAtMost(doc.textLength))
+        }
 
         fun codePart(s: String): String {
             val idx = s.indexOf("//")
             return if (idx >= 0) s.substring(0, idx) else s
         }
 
-        // Pre-scan to compute balances up to startLine
+        // Pre-scan to compute balances up to startLine.
+        val fragmentStartLine = doc.getLineNumber(currentLocalRange().startOffset)
         var blockLevel = 0
         var parenBalance = 0
         var bracketBalance = 0
-        for (ln in 0 until startLine) {
+        for (ln in fragmentStartLine until startLine) {
             val text = doc.getText(TextRange(doc.getLineStartOffset(ln), doc.getLineEndOffset(ln)))
             for (ch in codePart(text)) when (ch) {
                 '{' -> blockLevel++
@@ -85,7 +127,6 @@ class LyngPreFormatProcessor : PreFormatProcessor {
                     CodeStyleManager.getInstance(project).adjustLineIndent(file, lineStart)
                 } catch (e: Exception) {
                     // Log as debug because this can be called many times during reformat
-                    // and we don't want to spam warnings if it's a known platform issue with injections
                 }
             }
 
@@ -110,15 +151,14 @@ class LyngPreFormatProcessor : PreFormatProcessor {
                 useTabs = options.USE_TAB_CHARACTER,
                 continuationIndentSize = options.CONTINUATION_INDENT_SIZE.coerceAtLeast(options.INDENT_SIZE.coerceAtLeast(1)),
             )
-            val full = fullRange()
-            val r = if (runFullFileIndent) full else workingRange.intersection(full) ?: full
+            val r = if (runFullFileIndent) currentLocalRange() else workingRangeLocal.intersection(currentLocalRange()) ?: currentLocalRange()
             val text = doc.getText(r)
             val formatted = LyngFormatter.reindent(text, cfg)
             if (formatted != text) {
                 doc.replaceString(r.startOffset, r.endOffset, formatted)
                 modified = true
                 psiDoc.commitDocument(doc)
-                workingRange = fullRange()
+                workingRangeLocal = currentLocalRange()
             }
         }
 
@@ -131,14 +171,14 @@ class LyngPreFormatProcessor : PreFormatProcessor {
                 applySpacing = true,
                 applyWrapping = false,
             )
-            val safe = workingRange.intersection(fullRange()) ?: fullRange()
-            val text = doc.getText(safe)
+            val r = if (runFullFileIndent) currentLocalRange() else workingRangeLocal.intersection(currentLocalRange()) ?: currentLocalRange()
+            val text = doc.getText(r)
             val formatted = LyngFormatter.format(text, cfg)
             if (formatted != text) {
-                doc.replaceString(safe.startOffset, safe.endOffset, formatted)
+                doc.replaceString(r.startOffset, r.endOffset, formatted)
                 modified = true
                 psiDoc.commitDocument(doc)
-                workingRange = fullRange()
+                workingRangeLocal = currentLocalRange()
             }
         }
         // Optionally apply wrapping (after spacing) when enabled
@@ -150,17 +190,19 @@ class LyngPreFormatProcessor : PreFormatProcessor {
                 applySpacing = settings.enableSpacing,
                 applyWrapping = true,
             )
-            val safe2 = workingRange.intersection(fullRange()) ?: fullRange()
-            val text2 = doc.getText(safe2)
-            val wrapped = LyngFormatter.format(text2, cfg)
-            if (wrapped != text2) {
-                doc.replaceString(safe2.startOffset, safe2.endOffset, wrapped)
+            val r = if (runFullFileIndent) currentLocalRange() else workingRangeLocal.intersection(currentLocalRange()) ?: currentLocalRange()
+            val text = doc.getText(r)
+            val wrapped = LyngFormatter.format(text, cfg)
+            if (wrapped != text) {
+                doc.replaceString(r.startOffset, r.endOffset, wrapped)
                 modified = true
                 psiDoc.commitDocument(doc)
-                workingRange = fullRange()
+                workingRangeLocal = currentLocalRange()
             }
         }
-        // Return a safe range for the formatter to continue with, preventing stale offsets
-        return if (modified) fullRange() else (range.intersection(fullRange()) ?: fullRange())
+        // Return a safe range for the formatter to continue with, preventing stale offsets.
+        // For injected files, ALWAYS return a range in local coordinates.
+        val finalRange = currentLocalRange()
+        return if (modified) finalRange else (range.intersection(finalRange) ?: finalRange)
     }
 }

lyng-idea/src/main/kotlin/net/sergeych/lyng/idea/grazie/AddToLyngDictionaryFix.kt

@@ -1,43 +0,0 @@
-/*
- * Copyright 2025 Sergey S. Chernov real.sergeych@gmail.com
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- */
-package net.sergeych.lyng.idea.grazie
-
-import com.intellij.codeInsight.daemon.DaemonCodeAnalyzer
-import com.intellij.codeInsight.intention.IntentionAction
-import com.intellij.openapi.editor.Editor
-import com.intellij.openapi.project.Project
-import com.intellij.psi.PsiFile
-import net.sergeych.lyng.idea.settings.LyngFormatterSettings
-
-/**
- * Lightweight quick-fix that adds a word to the per-project Lyng dictionary.
- */
-class AddToLyngDictionaryFix(private val word: String) : IntentionAction {
-    override fun getText(): String = "Add '$word' to Lyng dictionary"
-    override fun getFamilyName(): String = "Lyng Spelling"
-    override fun isAvailable(project: Project, editor: Editor?, file: PsiFile?): Boolean = word.isNotBlank()
-    override fun startInWriteAction(): Boolean = true
-
-    override fun invoke(project: Project, editor: Editor?, file: PsiFile?) {
-        val settings = LyngFormatterSettings.getInstance(project)
-        val learned = settings.learnedWords
-        learned.add(word.lowercase())
-        settings.learnedWords = learned
-        // Restart daemon to refresh highlights
-        if (file != null) DaemonCodeAnalyzer.getInstance(project).restart(file)
-    }
-}

lyng-idea/src/main/kotlin/net/sergeych/lyng/idea/grazie/EnglishDictionary.kt

@@ -1,83 +0,0 @@
-/*
- * Copyright 2025 Sergey S. Chernov real.sergeych@gmail.com
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- */
-package net.sergeych.lyng.idea.grazie
-
-import com.intellij.openapi.diagnostic.Logger
-import java.io.BufferedReader
-import java.io.InputStreamReader
-import java.util.zip.GZIPInputStream
-
-/**
- * Very simple English dictionary loader for offline suggestions on IC-243.
- * It loads a word list from classpath resources. Supports plain text (one word per line)
- * and gzipped text if the resource ends with .gz.
- */
-object EnglishDictionary {
-    private val log = Logger.getInstance(EnglishDictionary::class.java)
-
-    @Volatile private var loaded = false
-    @Volatile private var words: Set<String> = emptySet()
-
-    /**
-     * Load dictionary from bundled resources (once).
-     * If multiple candidates exist, the first found is used.
-     */
-    private fun ensureLoaded() {
-        if (loaded) return
-        synchronized(this) {
-            if (loaded) return
-            val candidates = listOf(
-                // preferred large bundles first (add en-basic.txt.gz ~3–5MB here)
-                "/dictionaries/en-basic.txt.gz",
-                "/dictionaries/en-large.txt.gz",
-                // plain text fallbacks
-                "/dictionaries/en-basic.txt",
-                "/dictionaries/en-large.txt",
-            )
-            val merged = HashSet<String>(128_000)
-            for (res in candidates) {
-                try {
-                    val stream = javaClass.getResourceAsStream(res) ?: continue
-                    val reader = if (res.endsWith(".gz"))
-                        BufferedReader(InputStreamReader(GZIPInputStream(stream)))
-                    else
-                        BufferedReader(InputStreamReader(stream))
-                    var loadedCount = 0
-                    reader.useLines { seq -> seq.forEach { line ->
-                        val w = line.trim()
-                        if (w.isNotEmpty() && !w.startsWith("#")) { merged += w.lowercase(); loadedCount++ }
-                    } }
-                    log.info("EnglishDictionary: loaded $loadedCount words from $res (total=${merged.size})")
-                } catch (t: Throwable) {
-                    log.info("EnglishDictionary: failed to load $res: ${t.javaClass.simpleName}: ${t.message}")
-                }
-            }
-            if (merged.isEmpty()) {
-                // Fallback minimal set
-                merged += setOf("comment","comments","error","errors","found","file","not","word","words","count","value","name","class","function","string")
-                log.info("EnglishDictionary: using minimal built-in set (${merged.size})")
-            }
-            words = merged
-            loaded = true
-        }
-    }
-
-    fun allWords(): Set<String> {
-        ensureLoaded()
-        return words
-    }
-}

lyng-idea/src/main/kotlin/net/sergeych/lyng/idea/grazie/LyngGrazieAnnotator.kt

@@ -1,608 +0,0 @@
-/*
- * Copyright 2025 Sergey S. Chernov real.sergeych@gmail.com
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- */
-
-/*
- * Grazie-backed annotator for Lyng files.
- *
- * It consumes the MiniAst-driven LyngSpellIndex and, when Grazie is present,
- * tries to run Grazie checks on the extracted TextContent. Results are painted
- * as warnings in the editor. If the Grazie API changes, we use reflection and
- * fail softly with INFO logs (no errors shown to users).
- */
-package net.sergeych.lyng.idea.grazie
-
-import com.intellij.codeInsight.daemon.DaemonCodeAnalyzer
-import com.intellij.grazie.text.TextContent
-import com.intellij.grazie.text.TextContent.TextDomain
-import com.intellij.ide.plugins.PluginManagerCore
-import com.intellij.lang.annotation.AnnotationHolder
-import com.intellij.lang.annotation.ExternalAnnotator
-import com.intellij.lang.annotation.HighlightSeverity
-import com.intellij.openapi.application.ApplicationManager
-import com.intellij.openapi.diagnostic.Logger
-import com.intellij.openapi.editor.Document
-import com.intellij.openapi.editor.colors.TextAttributesKey
-import com.intellij.openapi.project.DumbAware
-import com.intellij.openapi.util.Key
-import com.intellij.openapi.util.TextRange
-import com.intellij.psi.PsiFile
-import net.sergeych.lyng.idea.settings.LyngFormatterSettings
-import net.sergeych.lyng.idea.spell.LyngSpellIndex
-
-class LyngGrazieAnnotator : ExternalAnnotator<LyngGrazieAnnotator.Input, LyngGrazieAnnotator.Result>(), DumbAware {
-    private val log = Logger.getInstance(LyngGrazieAnnotator::class.java)
-
-    companion object {
-        // Cache GrammarChecker availability to avoid repeated reflection + noisy logs
-        @Volatile
-        private var grammarCheckerAvailable: Boolean? = null
-
-        @Volatile
-        private var grammarCheckerMissingLogged: Boolean = false
-
-        private fun isGrammarCheckerKnownMissing(): Boolean = (grammarCheckerAvailable == false)
-
-        private fun markGrammarCheckerMissingOnce(log: Logger, message: String) {
-            if (!grammarCheckerMissingLogged) {
-                // Downgrade to debug to reduce log noise across projects/sessions
-                log.debug(message)
-                grammarCheckerMissingLogged = true
-            }
-        }
-
-        private val RETRY_KEY: Key<Long> = Key.create("LYNG_GRAZIE_ANN_RETRY_STAMP")
-    }
-
-    data class Input(val modStamp: Long)
-    data class Finding(val range: TextRange, val message: String)
-    data class Result(val modStamp: Long, val findings: List<Finding>)
-
-    override fun collectInformation(file: PsiFile): Input? {
-        val doc: Document = file.viewProvider.document ?: return null
-        // Only require Grazie presence; index readiness is checked in apply with a retry.
-        val grazie = isGrazieInstalled()
-        if (!grazie) {
-            log.info("LyngGrazieAnnotator.collectInformation: skip (grazie=false) file='${file.name}'")
-            return null
-        }
-        log.info("LyngGrazieAnnotator.collectInformation: file='${file.name}', modStamp=${doc.modificationStamp}")
-        return Input(doc.modificationStamp)
-    }
-
-    override fun doAnnotate(collectedInfo: Input?): Result? {
-        // All heavy lifting is done in apply where we have the file context
-        return collectedInfo?.let { Result(it.modStamp, emptyList()) }
-    }
-
-    override fun apply(file: PsiFile, annotationResult: Result?, holder: AnnotationHolder) {
-        if (annotationResult == null || !isGrazieInstalled()) return
-        val doc = file.viewProvider.document ?: return
-        val idx = LyngSpellIndex.getUpToDate(file) ?: run {
-            log.info("LyngGrazieAnnotator.apply: index not ready for '${file.name}', scheduling one-shot restart")
-            scheduleOneShotRestart(file, annotationResult.modStamp)
-            return
-        }
-
-        val settings = LyngFormatterSettings.getInstance(file.project)
-
-        // Build TextContent fragments for comments/strings/identifiers according to settings
-        val fragments = mutableListOf<Pair<TextContent, TextRange>>()
-        try {
-            fun addFragments(ranges: List<TextRange>, domain: TextDomain) {
-                for (r in ranges) {
-                    val local = rangeToTextContent(file, domain, r) ?: continue
-                    fragments += local to r
-                }
-            }
-            // Comments always via COMMENTS
-            addFragments(idx.comments, TextDomain.COMMENTS)
-            // Strings: LITERALS if requested, else COMMENTS if fallback enabled
-            if (settings.spellCheckStringLiterals) {
-                val domain = if (settings.grazieTreatLiteralsAsComments) TextDomain.COMMENTS else TextDomain.LITERALS
-                addFragments(idx.strings, domain)
-            }
-            // Identifiers via COMMENTS to force painting in 243 unless user disables fallback
-            val idsDomain = if (settings.grazieTreatIdentifiersAsComments) TextDomain.COMMENTS else TextDomain.DOCUMENTATION
-            addFragments(idx.identifiers, idsDomain)
-            log.info(
-                "LyngGrazieAnnotator.apply: file='${file.name}', idxCounts ids=${idx.identifiers.size}, comments=${idx.comments.size}, strings=${idx.strings.size}, builtFragments=${fragments.size}"
-            )
-        } catch (e: Throwable) {
-            log.info("LyngGrazieAnnotator: failed to build TextContent fragments: ${e.javaClass.simpleName}: ${e.message}")
-            return
-        }
-
-        if (fragments.isEmpty()) return
-
-        val findings = mutableListOf<Finding>()
-        var totalReturned = 0
-        var chosenEntry: String? = null
-        for ((content, hostRange) in fragments) {
-            try {
-                val (typos, entryNote) = runGrazieChecksWithTracing(file, content)
-                if (chosenEntry == null) chosenEntry = entryNote
-                if (typos != null) {
-                    totalReturned += typos.size
-                    for (t in typos) {
-                        val rel = extractRangeFromTypo(t) ?: continue
-                        // Map relative range inside fragment to host file range
-                        val abs = TextRange(hostRange.startOffset + rel.startOffset, hostRange.startOffset + rel.endOffset)
-                        findings += Finding(abs, extractMessageFromTypo(t) ?: "Spelling/Grammar")
-                    }
-                }
-            } catch (e: Throwable) {
-                log.info("LyngGrazieAnnotator: Grazie check failed: ${e.javaClass.simpleName}: ${e.message}")
-            }
-        }
-        log.info("LyngGrazieAnnotator.apply: used=${chosenEntry ?: "<none>"}, totalFindings=$totalReturned, painting=${findings.size}")
-
-        // IMPORTANT: Do NOT fallback to the tiny bundled vocabulary on modern IDEs.
-        // If Grazie/Natural Languages processing returned nothing, we simply exit here
-        // to avoid low‑quality results from the legacy dictionary.
-        if (findings.isEmpty()) return
-
-        for (f in findings) {
-            val ab = holder.newAnnotation(HighlightSeverity.INFORMATION, f.message).range(f.range)
-            applyTypoStyleIfRequested(file, ab)
-            ab.create()
-        }
-    }
-
-    private fun scheduleOneShotRestart(file: PsiFile, modStamp: Long) {
-        try {
-            val last = file.getUserData(RETRY_KEY)
-            if (last == modStamp) {
-                log.info("LyngGrazieAnnotator.restart: already retried for modStamp=$modStamp, skip")
-                return
-            }
-            file.putUserData(RETRY_KEY, modStamp)
-            ApplicationManager.getApplication().invokeLater({
-                try {
-                    DaemonCodeAnalyzer.getInstance(file.project).restart(file)
-                    log.info("LyngGrazieAnnotator.restart: daemon restarted for '${file.name}'")
-                } catch (e: Throwable) {
-                    log.info("LyngGrazieAnnotator.restart failed: ${e.javaClass.simpleName}: ${e.message}")
-                }
-            })
-        } catch (e: Throwable) {
-            log.info("LyngGrazieAnnotator.scheduleOneShotRestart failed: ${e.javaClass.simpleName}: ${e.message}")
-        }
-    }
-
-    private fun isGrazieInstalled(): Boolean {
-        return PluginManagerCore.isPluginInstalled(com.intellij.openapi.extensions.PluginId.getId("com.intellij.grazie")) ||
-                PluginManagerCore.isPluginInstalled(com.intellij.openapi.extensions.PluginId.getId("tanvd.grazi"))
-    }
-
-    private fun rangeToTextContent(file: PsiFile, domain: TextDomain, range: TextRange): TextContent? {
-        // Build TextContent via reflection: prefer psiFragment(domain, element)
-        return try {
-            // Try to find an element that fully covers the target range
-            var element = file.findElementAt(range.startOffset) ?: return null
-            val start = range.startOffset
-            val end = range.endOffset
-            while (element.parent != null && (element.textRange.startOffset > start || element.textRange.endOffset < end)) {
-                element = element.parent
-            }
-            if (element.textRange.startOffset > start || element.textRange.endOffset < end) return null
-            // In many cases, the element may not span the whole range; use file + range via suitable factory
-            val methods = TextContent::class.java.methods.filter { it.name == "psiFragment" }
-            val byElementDomain = methods.firstOrNull { it.parameterCount == 2 && it.parameterTypes[0].name.endsWith("PsiElement") }
-            if (byElementDomain != null) {
-                @Suppress("UNCHECKED_CAST")
-                return (byElementDomain.invoke(null, element, domain) as? TextContent)?.let { tc ->
-                    val relStart = start - element.textRange.startOffset
-                    val relEnd = end - element.textRange.startOffset
-                    if (relStart < 0 || relEnd > tc.length || relStart >= relEnd) return null
-                    tc.subText(TextRange(relStart, relEnd))
-                }
-            }
-            val byDomainElement = methods.firstOrNull { it.parameterCount == 2 && it.parameterTypes[0].name.endsWith("TextDomain") }
-            if (byDomainElement != null) {
-                @Suppress("UNCHECKED_CAST")
-                return (byDomainElement.invoke(null, domain, element) as? TextContent)?.let { tc ->
-                    val relStart = start - element.textRange.startOffset
-                    val relEnd = end - element.textRange.startOffset
-                    if (relStart < 0 || relEnd > tc.length || relStart >= relEnd) return null
-                    tc.subText(TextRange(relStart, relEnd))
-                }
-            }
-            null
-        } catch (e: Throwable) {
-            log.info("LyngGrazieAnnotator: rangeToTextContent failed: ${e.javaClass.simpleName}: ${e.message}")
-            null
-        }
-    }
-
-    private fun runGrazieChecksWithTracing(file: PsiFile, content: TextContent): Pair<Collection<Any>?, String?> {
-        // Try known entry points via reflection to avoid hard dependencies on Grazie internals
-        if (isGrammarCheckerKnownMissing()) return null to null
-        try {
-            // 1) Static GrammarChecker.check(TextContent)
-            val checkerCls = try {
-                Class.forName("com.intellij.grazie.grammar.GrammarChecker").also { grammarCheckerAvailable = true }
-            } catch (t: Throwable) {
-                grammarCheckerAvailable = false
-                markGrammarCheckerMissingOnce(log, "LyngGrazieAnnotator: GrammarChecker class not found: ${t.javaClass.simpleName}: ${t.message}")
-                null
-            }
-            if (checkerCls != null) {
-                // Diagnostic: list available 'check' methods once
-                runCatching {
-                    val checks = checkerCls.methods.filter { it.name == "check" }
-                    val sig = checks.joinToString { m ->
-                        val params = m.parameterTypes.joinToString(prefix = "(", postfix = ")") { it.simpleName }
-                        "${m.name}$params static=${java.lang.reflect.Modifier.isStatic(m.modifiers)}"
-                    }
-                    log.info("LyngGrazieAnnotator: GrammarChecker.check candidates: ${if (sig.isEmpty()) "<none>" else sig}")
-                }
-                checkerCls.methods.firstOrNull { it.name == "check" && it.parameterCount == 1 && it.parameterTypes[0].name.endsWith("TextContent") }?.let { m ->
-                    @Suppress("UNCHECKED_CAST")
-                    val res = m.invoke(null, content) as? Collection<Any>
-                    return res to "GrammarChecker.check(TextContent) static"
-                }
-                // 2) GrammarChecker.getInstance().check(TextContent)
-                val getInstance = checkerCls.methods.firstOrNull { it.name == "getInstance" && it.parameterCount == 0 }
-                val inst = getInstance?.invoke(null)
-                if (inst != null) {
-                    val m = checkerCls.methods.firstOrNull { it.name == "check" && it.parameterCount == 1 && it.parameterTypes[0].name.endsWith("TextContent") }
-                    if (m != null) {
-                        @Suppress("UNCHECKED_CAST")
-                        val res = m.invoke(inst, content) as? Collection<Any>
-                        return res to "GrammarChecker.getInstance().check(TextContent)"
-                    }
-                }
-                // 3) GrammarChecker.getDefault().check(TextContent)
-                val getDefault = checkerCls.methods.firstOrNull { it.name == "getDefault" && it.parameterCount == 0 }
-                val def = getDefault?.invoke(null)
-                if (def != null) {
-                    val m = checkerCls.methods.firstOrNull { it.name == "check" && it.parameterCount == 1 && it.parameterTypes[0].name.endsWith("TextContent") }
-                    if (m != null) {
-                        @Suppress("UNCHECKED_CAST")
-                        val res = m.invoke(def, content) as? Collection<Any>
-                        return res to "GrammarChecker.getDefault().check(TextContent)"
-                    }
-                }
-                // 4) Service from project/application: GrammarChecker as a service
-                runCatching {
-                    val app = com.intellij.openapi.application.ApplicationManager.getApplication()
-                    val getService = app::class.java.methods.firstOrNull { it.name == "getService" && it.parameterCount == 1 }
-                    val svc = getService?.invoke(app, checkerCls)
-                    if (svc != null) {
-                        val m = checkerCls.methods.firstOrNull { it.name == "check" && it.parameterCount == 1 && it.parameterTypes[0].name.endsWith("TextContent") }
-                        if (m != null) {
-                            @Suppress("UNCHECKED_CAST")
-                            val res = m.invoke(svc, content) as? Collection<Any>
-                            if (res != null) return res to "Application.getService(GrammarChecker).check(TextContent)"
-                        }
-                    }
-                }
-                runCatching {
-                    val getService = file.project::class.java.methods.firstOrNull { it.name == "getService" && it.parameterCount == 1 }
-                    val svc = getService?.invoke(file.project, checkerCls)
-                    if (svc != null) {
-                        val m = checkerCls.methods.firstOrNull { it.name == "check" && it.parameterCount == 1 && it.parameterTypes[0].name.endsWith("TextContent") }
-                        if (m != null) {
-                            @Suppress("UNCHECKED_CAST")
-                            val res = m.invoke(svc, content) as? Collection<Any>
-                            if (res != null) return res to "Project.getService(GrammarChecker).check(TextContent)"
-                        }
-                    }
-                }
-            }
-            // 5) Fallback: search any public method named check that accepts TextContent in any Grazie class (static)
-            val candidateClasses = listOf(
-                "com.intellij.grazie.grammar.GrammarChecker",
-                "com.intellij.grazie.grammar.GrammarRunner",
-                "com.intellij.grazie.grammar.Grammar" // historical names
-            )
-            for (cn in candidateClasses) {
-                val cls = try { Class.forName(cn) } catch (_: Throwable) { continue }
-                val m = cls.methods.firstOrNull { it.name == "check" && it.parameterTypes.any { p -> p.name.endsWith("TextContent") } }
-                if (m != null) {
-                    val args = arrayOfNulls<Any>(m.parameterCount)
-                    // place content to the first TextContent parameter; others left null (common defaults)
-                    for (i in 0 until m.parameterCount) if (m.parameterTypes[i].name.endsWith("TextContent")) { args[i] = content; break }
-                    @Suppress("UNCHECKED_CAST")
-                    val res = m.invoke(null, *args) as? Collection<Any>
-                    if (res != null) return res to "$cn.${m.name}(TextContent)"
-                }
-            }
-            // 6) Kotlin top-level function: GrammarCheckerKt.check(TextContent)
-            runCatching {
-                val kt = Class.forName("com.intellij.grazie.grammar.GrammarCheckerKt")
-                val m = kt.methods.firstOrNull { it.name == "check" && it.parameterTypes.any { p -> p.name.endsWith("TextContent") } }
-                if (m != null) {
-                    val args = arrayOfNulls<Any>(m.parameterCount)
-                    for (i in 0 until m.parameterCount) if (m.parameterTypes[i].name.endsWith("TextContent")) { args[i] = content; break }
-                    @Suppress("UNCHECKED_CAST")
-                    val res = m.invoke(null, *args) as? Collection<Any>
-                    if (res != null) return res to "GrammarCheckerKt.check(TextContent)"
-                }
-            }
-        } catch (e: Throwable) {
-            log.info("LyngGrazieAnnotator: runGrazieChecks reflection failed: ${e.javaClass.simpleName}: ${e.message}")
-        }
-        return null to null
-    }
-
-    private fun extractRangeFromTypo(typo: Any): TextRange? {
-        // Try to get a relative range from returned Grazie issue/typo via common accessors
-        return try {
-            // Common getters
-            val m1 = typo.javaClass.methods.firstOrNull { it.name == "getRange" && it.parameterCount == 0 }
-            val r1 = if (m1 != null) m1.invoke(typo) else null
-            when (r1) {
-                is TextRange -> return r1
-                is IntRange -> return TextRange(r1.first, r1.last + 1)
-            }
-            val m2 = typo.javaClass.methods.firstOrNull { it.name == "getHighlightRange" && it.parameterCount == 0 }
-            val r2 = if (m2 != null) m2.invoke(typo) else null
-            when (r2) {
-                is TextRange -> return r2
-                is IntRange -> return TextRange(r2.first, r2.last + 1)
-            }
-            // Separate from/to ints
-            val fromM = typo.javaClass.methods.firstOrNull { it.name == "getFrom" && it.parameterCount == 0 && it.returnType == Int::class.javaPrimitiveType }
-            val toM = typo.javaClass.methods.firstOrNull { it.name == "getTo" && it.parameterCount == 0 && it.returnType == Int::class.javaPrimitiveType }
-            if (fromM != null && toM != null) {
-                val s = (fromM.invoke(typo) as? Int) ?: return null
-                val e = (toM.invoke(typo) as? Int) ?: return null
-                if (e > s) return TextRange(s, e)
-            }
-            null
-        } catch (_: Throwable) { null }
-    }
-
-    private fun extractMessageFromTypo(typo: Any): String? {
-        return try {
-            val m = typo.javaClass.methods.firstOrNull { it.name == "getMessage" && it.parameterCount == 0 }
-            (m?.invoke(typo) as? String)
-        } catch (_: Throwable) { null }
-    }
-
-
-    // Fallback that uses legacy SpellCheckerManager (if present) via reflection to validate words in fragments.
-    // Returns number of warnings painted.
-    private fun fallbackWithLegacySpellcheckerIfAvailable(
-        file: PsiFile,
-        fragments: List<Pair<TextContent, TextRange>>,
-        holder: AnnotationHolder
-    ): Int {
-        return try {
-            val mgrCls = Class.forName("com.intellij.spellchecker.SpellCheckerManager")
-            val getInstance = mgrCls.methods.firstOrNull { it.name == "getInstance" && it.parameterCount == 1 }
-            val isCorrect = mgrCls.methods.firstOrNull { it.name == "isCorrect" && it.parameterCount == 1 && it.parameterTypes[0] == String::class.java }
-            if (getInstance == null || isCorrect == null) {
-                // No legacy spellchecker API available — fall back to naive painter
-                return naiveFallbackPaint(file, fragments, holder)
-            }
-            val mgr = getInstance.invoke(null, file.project)
-            if (mgr == null) {
-                // Legacy manager not present for this project — use naive fallback
-                return naiveFallbackPaint(file, fragments, holder)
-            }
-            var painted = 0
-            val docText = file.viewProvider.document?.text ?: return 0
-            val tokenRegex = Regex("[A-Za-z][A-Za-z0-9_']{2,}")
-            for ((content, hostRange) in fragments) {
-                val text = try { docText.substring(hostRange.startOffset, hostRange.endOffset) } catch (_: Throwable) { null } ?: continue
-                var seen = 0
-                var flagged = 0
-                for (m in tokenRegex.findAll(text)) {
-                    val token = m.value
-                    if ('%' in token) continue // skip printf fragments defensively
-                    // Split snake_case and camelCase within the token
-                    val parts = splitIdentifier(token)
-                    for (part in parts) {
-                        if (part.length <= 2) continue
-                        if (isAllowedWord(part)) continue
-                        // Quick allowlist for very common words to reduce noise if dictionaries differ
-                        val ok = try { isCorrect.invoke(mgr, part) as? Boolean } catch (_: Throwable) { null }
-                        if (ok == false) {
-                            // Map part back to original token occurrence within this hostRange
-                            val localStart = m.range.first + token.indexOf(part)
-                            val localEnd = localStart + part.length
-                            val abs = TextRange(hostRange.startOffset + localStart, hostRange.startOffset + localEnd)
-                            paintTypoAnnotation(file, holder, abs, part)
-                            painted++
-                            flagged++
-                        }
-                        seen++
-                    }
-                }
-                log.info("LyngGrazieAnnotator.fallback: fragment words=$seen, flagged=$flagged")
-            }
-            painted
-        } catch (_: Throwable) {
-            // If legacy manager is not available, fall back to a very naive heuristic (no external deps)
-            return naiveFallbackPaint(file, fragments, holder)
-        }
-    }
-
-    private fun naiveFallbackPaint(
-        file: PsiFile,
-        fragments: List<Pair<TextContent, TextRange>>,
-        holder: AnnotationHolder
-    ): Int {
-        var painted = 0
-        val docText = file.viewProvider.document?.text
-        val tokenRegex = Regex("[A-Za-z][A-Za-z0-9_']{2,}")
-        val baseWords = setOf(
-            // small, common vocabulary to catch near-miss typos in typical code/comments
-            "comment","comments","error","errors","found","file","not","word","words","count","value","name","class","function","string"
-        )
-        for ((content, hostRange) in fragments) {
-            val text: String? = docText?.let { dt ->
-                try { dt.substring(hostRange.startOffset, hostRange.endOffset) } catch (_: Throwable) { null }
-            }
-            if (text.isNullOrBlank()) continue
-            var seen = 0
-            var flagged = 0
-            for (m in tokenRegex.findAll(text)) {
-                val token = m.value
-                if ('%' in token) continue
-                val parts = splitIdentifier(token)
-                for (part in parts) {
-                    seen++
-                    val lower = part.lowercase()
-                    if (lower.length <= 2 || isAllowedWord(part)) continue
-                    // Heuristic: no vowels OR 3 repeated chars OR ends with unlikely double consonants
-                    val noVowel = lower.none { it in "aeiouy" }
-                    val triple = Regex("(.)\\1\\1").containsMatchIn(lower)
-                    val dblCons = Regex("[bcdfghjklmnpqrstvwxyz]{2}$").containsMatchIn(lower)
-                    var looksWrong = noVowel || triple || dblCons
-                    // Additional: low vowel ratio for length>=4
-                    if (!looksWrong && lower.length >= 4) {
-                        val vowels = lower.count { it in "aeiouy" }
-                        val ratio = if (lower.isNotEmpty()) vowels.toDouble() / lower.length else 1.0
-                        if (ratio < 0.25) looksWrong = true
-                    }
-                    // Additional: near-miss to a small base vocabulary (edit distance 1, or 2 for words >=6)
-                    if (!looksWrong) {
-                        for (bw in baseWords) {
-                            val d = editDistance(lower, bw)
-                            if (d == 1 || (d == 2 && lower.length >= 6)) { looksWrong = true; break }
-                        }
-                    }
-                    if (looksWrong) {
-                        val localStart = m.range.first + token.indexOf(part)
-                        val localEnd = localStart + part.length
-                        val abs = TextRange(hostRange.startOffset + localStart, hostRange.startOffset + localEnd)
-                        paintTypoAnnotation(file, holder, abs, part)
-                        painted++
-                        flagged++
-                    }
-                }
-            }
-            log.info("LyngGrazieAnnotator.fallback(naive): fragment words=$seen, flagged=$flagged")
-        }
-        return painted
-    }
-
-    private fun paintTypoAnnotation(file: PsiFile, holder: AnnotationHolder, range: TextRange, word: String) {
-        val settings = LyngFormatterSettings.getInstance(file.project)
-        val ab = holder.newAnnotation(HighlightSeverity.INFORMATION, "Possible typo")
-            .range(range)
-        applyTypoStyleIfRequested(file, ab)
-        if (settings.offerLyngTypoQuickFixes) {
-            // Offer lightweight fixes; for 243 provide Add-to-dictionary always
-            ab.withFix(net.sergeych.lyng.idea.grazie.AddToLyngDictionaryFix(word))
-            // Offer "Replace with…" candidates (top 7)
-            val cands = suggestReplacements(file, word).take(7)
-            for (c in cands) {
-                ab.withFix(net.sergeych.lyng.idea.grazie.ReplaceWordFix(range, word, c))
-            }
-        }
-        ab.create()
-    }
-
-    private fun applyTypoStyleIfRequested(file: PsiFile, ab: com.intellij.lang.annotation.AnnotationBuilder) {
-        val settings = LyngFormatterSettings.getInstance(file.project)
-        if (!settings.showTyposWithGreenUnderline) return
-        // Use the standard TYPO text attributes key used by the platform
-        val TYPO: TextAttributesKey = TextAttributesKey.createTextAttributesKey("TYPO")
-        try {
-            ab.textAttributes(TYPO)
-        } catch (_: Throwable) {
-            // some IDEs may not allow setting attributes on INFORMATION; ignore gracefully
-        }
-    }
-
-    private fun suggestReplacements(file: PsiFile, word: String): List<String> {
-        val lower = word.lowercase()
-        val fromProject = collectProjectWords(file)
-        val fromTech = TechDictionary.allWords()
-        val fromEnglish = EnglishDictionary.allWords()
-        // Merge with priority: project (p=0), tech (p=1), english (p=2)
-        val all = LinkedHashSet<String>()
-        all.addAll(fromProject)
-        all.addAll(fromTech)
-        all.addAll(fromEnglish)
-        data class Cand(val w: String, val d: Int, val p: Int)
-        val cands = ArrayList<Cand>(32)
-        for (w in all) {
-            if (w == lower) continue
-            if (kotlin.math.abs(w.length - lower.length) > 2) continue
-            val d = editDistance(lower, w)
-            val p = when {
-                w in fromProject -> 0
-                w in fromTech -> 1
-                else -> 2
-            }
-            cands += Cand(w, d, p)
-        }
-        cands.sortWith(compareBy<Cand> { it.d }.thenBy { it.p }.thenBy { it.w })
-        // Return a larger pool so callers can choose desired display count
-        return cands.take(16).map { it.w }
-    }
-
-    private fun collectProjectWords(file: PsiFile): Set<String> {
-        // Simple approach: use current file text; can be extended to project scanning later
-        val text = file.viewProvider.document?.text ?: return emptySet()
-        val out = LinkedHashSet<String>()
-        val tokenRegex = Regex("[A-Za-z][A-Za-z0-9_']{2,}")
-        for (m in tokenRegex.findAll(text)) {
-            val parts = splitIdentifier(m.value)
-            parts.forEach { out += it.lowercase() }
-        }
-        // Include learned words
-        val settings = LyngFormatterSettings.getInstance(file.project)
-        out.addAll(settings.learnedWords.map { it.lowercase() })
-        return out
-    }
-
-    private fun splitIdentifier(token: String): List<String> {
-        // Split on underscores and camelCase boundaries
-        val unders = token.split('_').filter { it.isNotBlank() }
-        val out = mutableListOf<String>()
-        val camelBoundary = Regex("(?<=[a-z])(?=[A-Z])")
-        for (u in unders) out += u.split(camelBoundary).filter { it.isNotBlank() }
-        return out
-    }
-
-    private fun isAllowedWord(w: String): Boolean {
-        val s = w.lowercase()
-        return s in setOf(
-            // common code words / language keywords to avoid noise
-            "val","var","fun","class","enum","type","import","package","return","if","else","when","while","for","try","catch","finally","true","false","null",
-            // very common English words
-            "the","and","or","not","with","from","into","this","that","file","found","count","name","value","object"
-        )
-    }
-
-    private fun editDistance(a: String, b: String): Int {
-        if (a == b) return 0
-        if (a.isEmpty()) return b.length
-        if (b.isEmpty()) return a.length
-        val dp = IntArray(b.length + 1) { it }
-        for (i in 1..a.length) {
-            var prev = dp[0]
-            dp[0] = i
-            for (j in 1..b.length) {
-                val temp = dp[j]
-                dp[j] = minOf(
-                    dp[j] + 1,                // deletion
-                    dp[j - 1] + 1,            // insertion
-                    prev + if (a[i - 1] == b[j - 1]) 0 else 1 // substitution
-                )
-                prev = temp
-            }
-        }
-        return dp[b.length]
-    }
-}

lyng-idea/src/main/kotlin/net/sergeych/lyng/idea/grazie/LyngGrazieStrategy.kt

@@ -1,139 +0,0 @@
-/*
- * Copyright 2025 Sergey S. Chernov real.sergeych@gmail.com
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- */
-package net.sergeych.lyng.idea.grazie
-
-import com.intellij.grazie.grammar.strategy.GrammarCheckingStrategy
-import com.intellij.grazie.grammar.strategy.GrammarCheckingStrategy.TextDomain
-import com.intellij.ide.plugins.PluginManagerCore
-import com.intellij.openapi.diagnostic.Logger
-import com.intellij.openapi.extensions.PluginId
-import com.intellij.openapi.util.TextRange
-import com.intellij.psi.PsiElement
-import net.sergeych.lyng.idea.highlight.LyngTokenTypes
-import net.sergeych.lyng.idea.settings.LyngFormatterSettings
-import net.sergeych.lyng.idea.spell.LyngSpellIndex
-
-/**
- * Grazie/Natural Languages strategy for Lyng.
- *
- * - Comments: checked as natural language (TextDomain.COMMENTS)
- * - String literals: optionally checked (setting), skipping printf-like specifiers via stealth ranges (TextDomain.LITERALS)
- * - Identifiers (non-keywords): checked under TextDomain.CODE so "Process code" controls apply
- * - Keywords: skipped
- */
-class LyngGrazieStrategy : GrammarCheckingStrategy {
-
-    private val log = Logger.getInstance(LyngGrazieStrategy::class.java)
-    @Volatile private var loggedOnce = false
-    @Volatile private var loggedFirstMatch = false
-    private val seenTypes: MutableSet<String> = java.util.Collections.synchronizedSet(mutableSetOf())
-
-    private fun legacySpellcheckerInstalled(): Boolean =
-        PluginManagerCore.isPluginInstalled(PluginId.getId("com.intellij.spellchecker"))
-
-    // Regex for printf-style specifiers: %[flags][width][.precision][length]type
-    private val spec = Regex("%(?:[-+ #0]*(?:\\d+)?(?:\\.\\d+)?[a-zA-Z%])")
-
-    override fun isMyContextRoot(element: PsiElement): Boolean {
-        val type = element.node?.elementType
-        val settings = LyngFormatterSettings.getInstance(element.project)
-        val legacyPresent = legacySpellcheckerInstalled()
-        if (type != null && seenTypes.size < 10) {
-            val name = type.toString()
-            if (seenTypes.add(name)) {
-                log.info("LyngGrazieStrategy: saw PSI type=$name")
-            }
-        }
-        if (!loggedOnce) {
-            loggedOnce = true
-            log.info("LyngGrazieStrategy activated: legacyPresent=$legacyPresent, preferGrazieForCommentsAndLiterals=${settings.preferGrazieForCommentsAndLiterals}, spellCheckStringLiterals=${settings.spellCheckStringLiterals}, grazieChecksIdentifiers=${settings.grazieChecksIdentifiers}")
-        }
-
-        val file = element.containingFile ?: return false
-        val index = LyngSpellIndex.getUpToDate(file) ?: return false // Suspend until ready
-        // To ensure Grazie asks TextExtractor for all leafs, accept any Lyng element once index is ready.
-        // The extractor will decide per-range/domain what to actually provide.
-        if (!loggedFirstMatch) {
-            loggedFirstMatch = true
-            log.info("LyngGrazieStrategy: enabling Grazie on all Lyng elements (index ready)")
-        }
-        return true
-    }
-
-    override fun getContextRootTextDomain(root: PsiElement): TextDomain {
-        val type = root.node?.elementType
-        val settings = LyngFormatterSettings.getInstance(root.project)
-        val file = root.containingFile
-        val index = if (file != null) LyngSpellIndex.getUpToDate(file) else null
-        val r = root.textRange
-
-        fun overlaps(list: List<TextRange>): Boolean = r != null && list.any { it.intersects(r) }
-
-        return when (type) {
-            LyngTokenTypes.LINE_COMMENT, LyngTokenTypes.BLOCK_COMMENT -> TextDomain.COMMENTS
-            LyngTokenTypes.STRING -> if (settings.grazieTreatLiteralsAsComments) TextDomain.COMMENTS else TextDomain.LITERALS
-            LyngTokenTypes.IDENTIFIER -> {
-                // For Grazie-only reliability in 243, route identifiers via COMMENTS when configured
-                if (settings.grazieTreatIdentifiersAsComments && index != null && r != null && overlaps(index.identifiers))
-                    TextDomain.COMMENTS
-                else TextDomain.PLAIN_TEXT
-            }
-            else -> TextDomain.PLAIN_TEXT
-        }
-    }
-
-    // Note: do not override getLanguageSupport to keep compatibility with 243 API
-
-    override fun getStealthyRanges(root: PsiElement, text: CharSequence): java.util.LinkedHashSet<IntRange> {
-        val result = LinkedHashSet<IntRange>()
-        val type = root.node?.elementType
-        if (type == LyngTokenTypes.STRING) {
-            if (!shouldCheckLiterals(root)) {
-                // Hide the entire string when literals checking is disabled by settings
-                result += (0 until text.length)
-                return result
-            }
-            // Hide printf-like specifiers in strings
-            val (start, end) = stripQuotesBounds(text)
-            if (end > start) {
-                val content = text.subSequence(start, end)
-                for (m in spec.findAll(content)) {
-                    val ms = start + m.range.first
-                    val me = start + m.range.last
-                    result += (ms..me)
-                }
-                if (result.isNotEmpty()) {
-                    log.debug("LyngGrazieStrategy: hidden ${result.size} printf specifier ranges in string literal")
-                }
-            }
-        }
-        return result
-    }
-
-    override fun isEnabledByDefault(): Boolean = true
-
-    private fun shouldCheckLiterals(root: PsiElement): Boolean =
-        LyngFormatterSettings.getInstance(root.project).spellCheckStringLiterals
-
-    private fun stripQuotesBounds(text: CharSequence): Pair<Int, Int> {
-        if (text.length < 2) return 0 to text.length
-        val first = text.first()
-        val last = text.last()
-        return if ((first == '"' && last == '"') || (first == '\'' && last == '\''))
-            1 to (text.length - 1) else (0 to text.length)
-    }
-}

lyng-idea/src/main/kotlin/net/sergeych/lyng/idea/grazie/LyngTextExtractor.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2025 Sergey S. Chernov real.sergeych@gmail.com
+ * Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,86 +19,29 @@ package net.sergeych.lyng.idea.grazie
 import com.intellij.grazie.text.TextContent
 import com.intellij.grazie.text.TextContent.TextDomain
 import com.intellij.grazie.text.TextExtractor
-import com.intellij.openapi.diagnostic.Logger
 import com.intellij.psi.PsiElement
 import net.sergeych.lyng.idea.highlight.LyngTokenTypes
-import net.sergeych.lyng.idea.settings.LyngFormatterSettings
-import net.sergeych.lyng.idea.spell.LyngSpellIndex
+import net.sergeych.lyng.idea.psi.LyngElementTypes
 
 /**
- * Provides Grazie with extractable text for Lyng PSI elements.
- * We return text for identifiers, comments, and (optionally) string literals.
- * printf-like specifiers are filtered by the Grammar strategy via stealth ranges.
+ * Simplified TextExtractor for Lyng.
+ * Designates areas for Natural Languages (Grazie) to check.
  */
 class LyngTextExtractor : TextExtractor() {
-    private val log = Logger.getInstance(LyngTextExtractor::class.java)
-    @Volatile private var loggedOnce = false
-    private val seen: MutableSet<String> = java.util.Collections.synchronizedSet(mutableSetOf())
-
     override fun buildTextContent(element: PsiElement, allowedDomains: Set<TextDomain>): TextContent? {
         val type = element.node?.elementType ?: return null
-        if (!loggedOnce) {
-            loggedOnce = true
-            log.info("LyngTextExtractor active; allowedDomains=${allowedDomains.joinToString()}")
-        }
-        val settings = LyngFormatterSettings.getInstance(element.project)
-        val file = element.containingFile
-        val index = if (file != null) LyngSpellIndex.getUpToDate(file) else null
-        val r = element.textRange
         
-        fun overlaps(list: List<com.intellij.openapi.util.TextRange>): Boolean = r != null && list.any { it.intersects(r) }
-
-        // Decide target domain by intersection with our MiniAst-driven index; prefer comments > strings > identifiers
-        var domain: TextDomain? = null
-        if (index != null && r != null) {
-            if (overlaps(index.comments)) domain = TextDomain.COMMENTS
-            else if (overlaps(index.strings) && settings.spellCheckStringLiterals) domain = TextDomain.LITERALS
-            else if (overlaps(index.identifiers)) domain = if (settings.grazieTreatIdentifiersAsComments) TextDomain.COMMENTS else TextDomain.DOCUMENTATION
-        } else {
-            // Fallback to token type if index is not ready (rare timing), mostly for comments
-            domain = when (type) {
+        val domain = when (type) {
             LyngTokenTypes.LINE_COMMENT, LyngTokenTypes.BLOCK_COMMENT -> TextDomain.COMMENTS
-                else -> null
+            LyngTokenTypes.STRING -> TextDomain.LITERALS
+            LyngElementTypes.NAME_IDENTIFIER,
+            LyngElementTypes.PARAMETER_NAME,
+            LyngElementTypes.ENUM_CONSTANT_NAME -> TextDomain.COMMENTS
+            else -> return null
         }
-        }
-        if (domain == null) return null
         
-        // If literals aren't requested but fallback is enabled, route strings as COMMENTS
-        if (domain == TextDomain.LITERALS && !allowedDomains.contains(TextDomain.LITERALS) && settings.grazieTreatLiteralsAsComments) {
-            domain = TextDomain.COMMENTS
-        }
-        if (!allowedDomains.contains(domain)) {
-            if (seen.add("deny-${domain.name}")) {
-                log.info("LyngTextExtractor: domain ${domain.name} not in allowedDomains; skipping")
-            }
-            return null
-        }
-        return try {
-            // Try common factory names across versions
-            val methods = TextContent::class.java.methods.filter { it.name == "psiFragment" }
-            val built: TextContent? = when {
-                // Try psiFragment(PsiElement, TextDomain)
-                methods.any { it.parameterCount == 2 && it.parameterTypes[0].name.contains("PsiElement") } -> {
-                    val m = methods.first { it.parameterCount == 2 && it.parameterTypes[0].name.contains("PsiElement") }
-                    @Suppress("UNCHECKED_CAST")
-                    (m.invoke(null, element, domain) as? TextContent)?.also {
-                        if (seen.add("ok-${domain.name}")) log.info("LyngTextExtractor: provided ${domain.name} for ${type} via psiFragment(element, domain)")
-                    }
-                }
-                // Try psiFragment(TextDomain, PsiElement)
-                methods.any { it.parameterCount == 2 && it.parameterTypes[0].name.endsWith("TextDomain") } -> {
-                    val m = methods.first { it.parameterCount == 2 && it.parameterTypes[0].name.endsWith("TextDomain") }
-                    @Suppress("UNCHECKED_CAST")
-                    (m.invoke(null, domain, element) as? TextContent)?.also {
-                        if (seen.add("ok-${domain.name}")) log.info("LyngTextExtractor: provided ${domain.name} for ${type} via psiFragment(domain, element)")
-                    }
-                }
-                else -> null
-            }
-            built
-        } catch (e: Throwable) {
-            log.info("LyngTextExtractor: failed to build TextContent: ${e.javaClass.simpleName}: ${e.message}")
-            null
-        }
+        if (!allowedDomains.contains(domain)) return null
+        
+        return TextContent.psiFragment(domain, element)
     }
 }

lyng-idea/src/main/kotlin/net/sergeych/lyng/idea/grazie/ReplaceWordFix.kt

@@ -1,86 +0,0 @@
-/*
- * Copyright 2025 Sergey S. Chernov real.sergeych@gmail.com
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- */
-package net.sergeych.lyng.idea.grazie
-
-import com.intellij.codeInsight.daemon.DaemonCodeAnalyzer
-import com.intellij.codeInsight.intention.IntentionAction
-import com.intellij.openapi.command.WriteCommandAction
-import com.intellij.openapi.editor.CaretModel
-import com.intellij.openapi.editor.Document
-import com.intellij.openapi.editor.Editor
-import com.intellij.openapi.project.Project
-import com.intellij.openapi.util.TextRange
-import com.intellij.psi.PsiFile
-
-/**
- * Lightweight quick-fix to replace a misspelled word (subrange) with a suggested alternative.
- * Works without the legacy Spell Checker. The replacement is applied directly to the file text.
- */
-class ReplaceWordFix(
-    private val range: TextRange,
-    private val original: String,
-    private val replacementRaw: String
-) : IntentionAction {
-
-    override fun getText(): String = "Replace '$original' with '$replacementRaw'"
-    override fun getFamilyName(): String = "Lyng Spelling"
-    override fun isAvailable(project: Project, editor: Editor?, file: PsiFile?): Boolean =
-        editor != null && file != null && range.startOffset in 0..range.endOffset
-
-    override fun startInWriteAction(): Boolean = true
-
-    override fun invoke(project: Project, editor: Editor?, file: PsiFile?) {
-        if (editor == null) return
-        val doc: Document = editor.document
-        val safeRange = range.constrainTo(doc)
-        val current = doc.getText(safeRange)
-        // Preserve basic case style based on the original token
-        val replacement = adaptCaseStyle(current, replacementRaw)
-        WriteCommandAction.runWriteCommandAction(project, "Replace word", null, Runnable {
-            doc.replaceString(safeRange.startOffset, safeRange.endOffset, replacement)
-        }, file)
-        // Move caret to end of replacement for convenience
-        try {
-            val caret: CaretModel = editor.caretModel
-            caret.moveToOffset(safeRange.startOffset + replacement.length)
-        } catch (_: Throwable) {}
-        // Restart daemon to refresh highlights
-        if (file != null) DaemonCodeAnalyzer.getInstance(project).restart(file)
-    }
-
-    private fun TextRange.constrainTo(doc: Document): TextRange {
-        val start = startOffset.coerceIn(0, doc.textLength)
-        val end = endOffset.coerceIn(start, doc.textLength)
-        return TextRange(start, end)
-    }
-
-    private fun adaptCaseStyle(sample: String, suggestion: String): String {
-        if (suggestion.isEmpty()) return suggestion
-        return when {
-            sample.all { it.isUpperCase() } -> suggestion.uppercase()
-            // PascalCase / Capitalized single word
-            sample.firstOrNull()?.isUpperCase() == true && sample.drop(1).any { it.isLowerCase() } ->
-                suggestion.replaceFirstChar { if (it.isLowerCase()) it.titlecase() else it.toString() }
-            // snake_case -> lower
-            sample.contains('_') -> suggestion.lowercase()
-            // camelCase -> lower first
-            sample.firstOrNull()?.isLowerCase() == true && sample.any { it.isUpperCase() } ->
-                suggestion.replaceFirstChar { it.lowercase() }
-            else -> suggestion
-        }
-    }
-}

lyng-idea/src/main/kotlin/net/sergeych/lyng/idea/grazie/TechDictionary.kt

@@ -1,77 +0,0 @@
-/*
- * Copyright 2025 Sergey S. Chernov real.sergeych@gmail.com
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- */
-package net.sergeych.lyng.idea.grazie
-
-import com.intellij.openapi.diagnostic.Logger
-import java.io.BufferedReader
-import java.io.InputStreamReader
-import java.util.zip.GZIPInputStream
-
-/**
- * Lightweight technical/Lyng vocabulary dictionary.
- * Loaded from classpath resources; supports .txt and .txt.gz. Merged with EnglishDictionary.
- */
-object TechDictionary {
-    private val log = Logger.getInstance(TechDictionary::class.java)
-    @Volatile private var loaded = false
-    @Volatile private var words: Set<String> = emptySet()
-
-    private fun ensureLoaded() {
-        if (loaded) return
-        synchronized(this) {
-            if (loaded) return
-            val candidates = listOf(
-                "/dictionaries/tech-lyng.txt.gz",
-                "/dictionaries/tech-lyng.txt"
-            )
-            val merged = HashSet<String>(8_000)
-            for (res in candidates) {
-                try {
-                    val stream = javaClass.getResourceAsStream(res) ?: continue
-                    val reader = if (res.endsWith(".gz"))
-                        BufferedReader(InputStreamReader(GZIPInputStream(stream)))
-                    else
-                        BufferedReader(InputStreamReader(stream))
-                    var n = 0
-                    reader.useLines { seq -> seq.forEach { line ->
-                        val w = line.trim()
-                        if (w.isNotEmpty() && !w.startsWith("#")) { merged += w.lowercase(); n++ }
-                    } }
-                    log.info("TechDictionary: loaded $n words from $res (total=${merged.size})")
-                } catch (t: Throwable) {
-                    log.info("TechDictionary: failed to load $res: ${t.javaClass.simpleName}: ${t.message}")
-                }
-            }
-            if (merged.isEmpty()) {
-                merged += setOf(
-                    // minimal Lyng/tech seeding to avoid empty dictionary
-                    "lyng","miniast","binder","printf","specifier","specifiers","regex","token","tokens",
-                    "identifier","identifiers","keyword","keywords","comment","comments","string","strings",
-                    "literal","literals","formatting","formatter","grazie","typo","typos","dictionary","dictionaries"
-                )
-                log.info("TechDictionary: using minimal built-in set (${merged.size})")
-            }
-            words = merged
-            loaded = true
-        }
-    }
-
-    fun allWords(): Set<String> {
-        ensureLoaded()
-        return words
-    }
-}

lyng-idea/src/main/kotlin/net/sergeych/lyng/idea/highlight/LyngColorSettingsPage.kt

@@ -43,10 +43,15 @@ class LyngColorSettingsPage : ColorSettingsPage {
         }
         
         var counter = 0
+        outer@ while (counter < 10) {
+          if (counter == 5) return@outer
           counter = counter + 1
+        }
     """.trimIndent()
 
-    override fun getAdditionalHighlightingTagToDescriptorMap(): MutableMap<String, TextAttributesKey>? = null
+    override fun getAdditionalHighlightingTagToDescriptorMap(): MutableMap<String, TextAttributesKey> = mutableMapOf(
+        "label" to LyngHighlighterColors.LABEL
+    )
 
     override fun getAttributeDescriptors(): Array<AttributesDescriptor> = arrayOf(
         AttributesDescriptor("Keyword", LyngHighlighterColors.KEYWORD),
@@ -58,6 +63,7 @@ class LyngColorSettingsPage : ColorSettingsPage {
         AttributesDescriptor("Punctuation", LyngHighlighterColors.PUNCT),
         // Semantic
         AttributesDescriptor("Annotation (semantic)", LyngHighlighterColors.ANNOTATION),
+        AttributesDescriptor("Label (semantic)", LyngHighlighterColors.LABEL),
         AttributesDescriptor("Variable (semantic)", LyngHighlighterColors.VARIABLE),
         AttributesDescriptor("Value (semantic)", LyngHighlighterColors.VALUE),
         AttributesDescriptor("Function (semantic)", LyngHighlighterColors.FUNCTION),

lyng-idea/src/main/kotlin/net/sergeych/lyng/idea/highlight/LyngHighlighterColors.kt

@@ -82,4 +82,9 @@ object LyngHighlighterColors {
     val ENUM_CONSTANT: TextAttributesKey = TextAttributesKey.createTextAttributesKey(
         "LYNG_ENUM_CONSTANT", DefaultLanguageHighlighterColors.STATIC_FIELD
     )
+
+    // Labels (label@ or @label used as exit target)
+    val LABEL: TextAttributesKey = TextAttributesKey.createTextAttributesKey(
+        "LYNG_LABEL", DefaultLanguageHighlighterColors.LABEL
+    )
 }

lyng-idea/src/main/kotlin/net/sergeych/lyng/idea/highlight/LyngLexer.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2025 Sergey S. Chernov real.sergeych@gmail.com
+ * Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -32,10 +32,11 @@ class LyngLexer : LexerBase() {
     private var myTokenType: IElementType? = null
 
     private val keywords = setOf(
-        "fun", "val", "var", "class", "type", "import", "as",
+        "fun", "val", "var", "class", "interface", "type", "import", "as",
+        "abstract", "closed", "override", "static", "extern", "open", "private", "protected",
         "if", "else", "for", "while", "return", "true", "false", "null",
         "when", "in", "is", "break", "continue", "try", "catch", "finally",
-        "get", "set"
+        "get", "set", "object", "enum", "init", "by", "step", "property", "constructor"
     )
 
     override fun start(buffer: CharSequence, startOffset: Int, endOffset: Int, initialState: Int) {
@@ -100,8 +101,9 @@ class LyngLexer : LexerBase() {
             return
         }
 
-        // String "..." with simple escape handling
-        if (ch == '"') {
+        // String "..." or '...' with simple escape handling
+        if (ch == '"' || ch == '\'') {
+            val quote = ch
             i++
             while (i < endOffset) {
                 val c = buffer[i]
@@ -109,7 +111,7 @@ class LyngLexer : LexerBase() {
                     i += 2
                     continue
                 }
-                if (c == '"') { i++; break }
+                if (c == quote) { i++; break }
                 i++
             }
             myTokenEnd = i
@@ -119,12 +121,39 @@ class LyngLexer : LexerBase() {
 
         // Number
         if (ch.isDigit()) {
+            // Check for hex: 0x...
+            if (ch == '0' && i + 1 < endOffset && buffer[i + 1] == 'x') {
+                i += 2
+                while (i < endOffset && (buffer[i].isDigit() || buffer[i] in 'a'..'f' || buffer[i] in 'A'..'F')) i++
+                myTokenEnd = i
+                myTokenType = LyngTokenTypes.NUMBER
+                return
+            }
+
+            // Decimal or integer
             i++
             var hasDot = false
+            var hasE = false
             while (i < endOffset) {
                 val c = buffer[i]
-                if (c.isDigit()) { i++; continue }
-                if (c == '.' && !hasDot) { hasDot = true; i++; continue }
+                if (c.isDigit() || c == '_') {
+                    i++
+                    continue
+                }
+                if (c == '.' && !hasDot && !hasE) {
+                    // Check if it's a fractional part (must be followed by a digit)
+                    if (i + 1 < endOffset && buffer[i + 1].isDigit()) {
+                        hasDot = true
+                        i++
+                        continue
+                    }
+                }
+                if ((c == 'e' || c == 'E') && !hasE) {
+                    hasE = true
+                    i++
+                    if (i < endOffset && (buffer[i] == '+' || buffer[i] == '-')) i++
+                    continue
+                }
                 break
             }
             myTokenEnd = i
@@ -132,10 +161,24 @@ class LyngLexer : LexerBase() {
             return
         }
 
-        // Identifier / keyword
+        // Labels / Annotations: @label or label@
+        if (ch == '@') {
+            i++
+            while (i < endOffset && (buffer[i].isIdentifierPart())) i++
+            myTokenEnd = i
+            myTokenType = LyngTokenTypes.LABEL
+            return
+        }
+
         if (ch.isIdentifierStart()) {
             i++
             while (i < endOffset && buffer[i].isIdentifierPart()) i++
+            if (i < endOffset && buffer[i] == '@') {
+                i++
+                myTokenEnd = i
+                myTokenType = LyngTokenTypes.LABEL
+                return
+            }
             myTokenEnd = i
             val text = buffer.subSequence(myTokenStart, myTokenEnd).toString()
             myTokenType = if (text in keywords) LyngTokenTypes.KEYWORD else LyngTokenTypes.IDENTIFIER
@@ -145,6 +188,35 @@ class LyngLexer : LexerBase() {
         // Punctuation
         if (isPunct(ch)) {
             i++
+            // Handle common multi-char operators for better highlighting
+            when (ch) {
+                '.' -> {
+                    if (i < endOffset && buffer[i] == '.') {
+                        i++
+                        if (i < endOffset && (buffer[i] == '.' || buffer[i] == '<')) i++
+                    }
+                }
+                '=' -> {
+                    if (i < endOffset && (buffer[i] == '=' || buffer[i] == '>' || buffer[i] == '~')) {
+                        i++
+                        if (buffer[i - 1] == '=' && i < endOffset && buffer[i] == '=') i++
+                    }
+                }
+                '+', '-', '*', '/', '%', '!', '<', '>', '&', '|', '?', ':', '^' -> {
+                    if (i < endOffset) {
+                        val next = buffer[i]
+                        if (next == '=' || next == ch) {
+                            i++
+                            if (ch == '<' && next == '=' && i < endOffset && buffer[i] == '>') i++
+                            if (ch == '!' && next == '=' && i < endOffset && buffer[i] == '=') i++
+                        } else if (ch == '?' && (next == '.' || next == '[' || next == '(' || next == '{' || next == ':' || next == '?')) {
+                            i++
+                        } else if (ch == '-' && next == '>') {
+                            i++
+                        }
+                    }
+                }
+            }
             myTokenEnd = i
             myTokenType = LyngTokenTypes.PUNCT
             return
@@ -159,5 +231,5 @@ class LyngLexer : LexerBase() {
     private fun Char.isDigit(): Boolean = this in '0'..'9'
     private fun Char.isIdentifierStart(): Boolean = this == '_' || this.isLetter()
     private fun Char.isIdentifierPart(): Boolean = this.isIdentifierStart() || this.isDigit()
-    private fun isPunct(c: Char): Boolean = c in setOf('(', ')', '{', '}', '[', ']', '.', ',', ';', ':', '+', '-', '*', '/', '%', '=', '<', '>', '!', '?', '&', '|', '^', '~')
+    private fun isPunct(c: Char): Boolean = c in setOf('(', ')', '{', '}', '[', ']', '.', ',', ';', ':', '+', '-', '*', '/', '%', '=', '<', '>', '!', '?', '&', '|', '^', '~', '@')
 }

lyng-idea/src/main/kotlin/net/sergeych/lyng/idea/highlight/LyngSyntaxHighlighter.kt

@@ -33,6 +33,7 @@ class LyngSyntaxHighlighter : SyntaxHighlighter {
         LyngTokenTypes.BLOCK_COMMENT -> pack(LyngHighlighterColors.BLOCK_COMMENT)
         LyngTokenTypes.PUNCT -> pack(LyngHighlighterColors.PUNCT)
         LyngTokenTypes.IDENTIFIER -> pack(LyngHighlighterColors.IDENTIFIER)
+        LyngTokenTypes.LABEL -> pack(LyngHighlighterColors.LABEL)
         else -> emptyArray()
     }
 

lyng-idea/src/main/kotlin/net/sergeych/lyng/idea/highlight/LyngTokenTypes.kt

@@ -29,6 +29,7 @@ object LyngTokenTypes {
     val NUMBER = LyngTokenType("NUMBER")
     val KEYWORD = LyngTokenType("KEYWORD")
     val IDENTIFIER = LyngTokenType("IDENTIFIER")
+    val LABEL = LyngTokenType("LABEL")
     val PUNCT = LyngTokenType("PUNCT")
     val BAD_CHAR = LyngTokenType("BAD_CHAR")
 }

lyng-idea/src/main/kotlin/net/sergeych/lyng/idea/navigation/LyngGotoDeclarationHandler.kt

@@ -20,13 +20,14 @@ package net.sergeych.lyng.idea.navigation
 import com.intellij.codeInsight.navigation.actions.GotoDeclarationHandler
 import com.intellij.openapi.editor.Editor
 import com.intellij.psi.PsiElement
+import net.sergeych.lyng.idea.LyngLanguage
 
 /**
  * Ensures Ctrl+B (Go to Definition) works on Lyng identifiers by resolving through LyngPsiReference.
  */
 class LyngGotoDeclarationHandler : GotoDeclarationHandler {
     override fun getGotoDeclarationTargets(sourceElement: PsiElement?, offset: Int, editor: Editor?): Array<PsiElement>? {
-        if (sourceElement == null) return null
+        if (sourceElement == null || sourceElement.language != LyngLanguage) return null
         
         val allTargets = mutableListOf<PsiElement>()
 

lyng-idea/src/main/kotlin/net/sergeych/lyng/idea/navigation/LyngPsiReference.kt

@@ -36,18 +36,22 @@ class LyngPsiReference(element: PsiElement) : PsiPolyVariantReferenceBase<PsiEle
         val name = element.text ?: ""
         val results = mutableListOf<ResolveResult>()
 
-        val mini = LyngAstManager.getMiniAst(file) ?: return emptyArray()
-        val binding = LyngAstManager.getBinding(file)
+        val analysis = LyngAstManager.getAnalysis(file) ?: return emptyArray()
+        val mini = analysis.mini ?: return emptyArray()
+        val binding = analysis.binding
+        val imported = analysis.importedModules.toSet()
+        val currentPackage = getPackageName(file)
+        val allowedPackages = if (currentPackage != null) imported + currentPackage else imported
 
         // 1. Member resolution (obj.member)
         val dotPos = TextCtx.findDotLeft(text, offset)
         if (dotPos != null) {
-            val imported = DocLookupUtils.canonicalImportedModules(mini, text)
-            val receiverClass = DocLookupUtils.guessReceiverClassViaMini(mini, text, dotPos, imported, binding)
-                ?: DocLookupUtils.guessReceiverClass(text, dotPos, imported, mini)
+            val receiverClass = DocLookupUtils.guessReceiverClassViaMini(mini, text, dotPos, imported.toList(), binding)
+                ?: DocLookupUtils.guessReceiverClass(text, dotPos, imported.toList(), mini)
+            val staticOnly = DocLookupUtils.isStaticReceiver(mini, text, dotPos, imported.toList(), binding)
             
             if (receiverClass != null) {
-                val resolved = DocLookupUtils.resolveMemberWithInheritance(imported, receiverClass, name, mini)
+                val resolved = DocLookupUtils.resolveMemberWithInheritance(imported.toList(), receiverClass, name, mini, staticOnly = staticOnly)
                 if (resolved != null) {
                     val owner = resolved.first
                     val member = resolved.second
@@ -62,7 +66,13 @@ class LyngPsiReference(element: PsiElement) : PsiPolyVariantReferenceBase<PsiEle
                             val kind = when(member) {
                                 is MiniMemberFunDecl -> "Function"
                                 is MiniMemberValDecl -> if (member.mutable) "Variable" else "Value"
+                                is MiniMemberTypeAliasDecl -> "TypeAlias"
                                 is MiniInitDecl -> "Initializer"
+                                is MiniFunDecl -> "Function"
+                                is MiniValDecl -> if (member.mutable) "Variable" else "Value"
+                                is MiniClassDecl -> "Class"
+                                is MiniEnumDecl -> "Enum"
+                                is MiniTypeAliasDecl -> "TypeAlias"
                             }
                             results.add(PsiElementResolveResult(LyngDeclarationElement(it, member.name, kind)))
                         }
@@ -71,7 +81,7 @@ class LyngPsiReference(element: PsiElement) : PsiPolyVariantReferenceBase<PsiEle
             }
             // If we couldn't resolve exactly, we might still want to search globally but ONLY for members
             if (results.isEmpty()) {
-                results.addAll(resolveGlobally(file.project, name, membersOnly = true))
+                results.addAll(resolveGlobally(file.project, name, membersOnly = true, allowedPackages = allowedPackages))
             }
         } else {
             // 2. Local resolution via Binder
@@ -90,7 +100,7 @@ class LyngPsiReference(element: PsiElement) : PsiPolyVariantReferenceBase<PsiEle
             // 3. Global project scan
             // Only search globally if we haven't found a strong local match
             if (results.isEmpty()) {
-                results.addAll(resolveGlobally(file.project, name))
+                results.addAll(resolveGlobally(file.project, name, allowedPackages = allowedPackages))
             }
         }
 
@@ -137,6 +147,16 @@ class LyngPsiReference(element: PsiElement) : PsiPolyVariantReferenceBase<PsiEle
         return null
     }
 
+    private fun getPackageName(file: PsiFile): String? {
+        val mini = LyngAstManager.getMiniAst(file) ?: return null
+        return try {
+            val pkg = mini.range.start.source.extractPackageName()
+            if (pkg.startsWith("lyng.")) pkg else "lyng.$pkg"
+        } catch (e: Exception) {
+            null
+        }
+    }
+
     override fun resolve(): PsiElement? {
         val results = multiResolve(false)
         if (results.isEmpty()) return null
@@ -150,13 +170,20 @@ class LyngPsiReference(element: PsiElement) : PsiPolyVariantReferenceBase<PsiEle
         return target
     }
 
-    private fun resolveGlobally(project: Project, name: String, membersOnly: Boolean = false): List<ResolveResult> {
+    private fun resolveGlobally(project: Project, name: String, membersOnly: Boolean = false, allowedPackages: Set<String>? = null): List<ResolveResult> {
         val results = mutableListOf<ResolveResult>()
         val files = FilenameIndex.getAllFilesByExt(project, "lyng", GlobalSearchScope.projectScope(project))
         val psiManager = PsiManager.getInstance(project)
 
         for (vFile in files) {
             val file = psiManager.findFile(vFile) ?: continue
+            
+            // Filter by package if requested
+            if (allowedPackages != null) {
+                val pkg = getPackageName(file)
+                if (pkg == null || pkg !in allowedPackages) continue
+            }
+
             val mini = LyngAstManager.getMiniAst(file) ?: continue
             val src = mini.range.start.source
 
@@ -176,6 +203,7 @@ class LyngPsiReference(element: PsiElement) : PsiPolyVariantReferenceBase<PsiEle
                         is net.sergeych.lyng.miniast.MiniClassDecl -> "Class"
                         is net.sergeych.lyng.miniast.MiniEnumDecl -> "Enum"
                         is net.sergeych.lyng.miniast.MiniValDecl -> if (d.mutable) "Variable" else "Value"
+                        is net.sergeych.lyng.miniast.MiniTypeAliasDecl -> "TypeAlias"
                     }
                     addIfMatch(d.name, d.nameStart, dKind)
                 }
@@ -191,6 +219,7 @@ class LyngPsiReference(element: PsiElement) : PsiPolyVariantReferenceBase<PsiEle
                     val mKind = when(m) {
                         is net.sergeych.lyng.miniast.MiniMemberFunDecl -> "Function"
                         is net.sergeych.lyng.miniast.MiniMemberValDecl -> if (m.mutable) "Variable" else "Value"
+                        is net.sergeych.lyng.miniast.MiniMemberTypeAliasDecl -> "TypeAlias"
                         is net.sergeych.lyng.miniast.MiniInitDecl -> "Initializer"
                     }
                     addIfMatch(m.name, m.nameStart, mKind)

lyng-idea/src/main/kotlin/net/sergeych/lyng/idea/psi/LyngElementTypes.kt

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package net.sergeych.lyng.idea.psi
+
+import com.intellij.psi.tree.IElementType
+import net.sergeych.lyng.idea.LyngLanguage
+
+object LyngElementTypes {
+    val NAME_IDENTIFIER = IElementType("NAME_IDENTIFIER", LyngLanguage)
+    val PARAMETER_NAME = IElementType("PARAMETER_NAME", LyngLanguage)
+    val ENUM_CONSTANT_NAME = IElementType("ENUM_CONSTANT_NAME", LyngLanguage)
+}

lyng-idea/src/main/kotlin/net/sergeych/lyng/idea/psi/LyngParserDefinition.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2025 Sergey S. Chernov real.sergeych@gmail.com
+ * Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -45,7 +45,68 @@ class LyngParserDefinition : ParserDefinition {
 
     override fun createParser(project: Project?): PsiParser = PsiParser { root, builder ->
         val mark: PsiBuilder.Marker = builder.mark()
-        while (!builder.eof()) builder.advanceLexer()
+        var lastKeyword: String? = null
+        var inEnum = false
+        var inParams = false
+        var parenDepth = 0
+        var braceDepth = 0
+
+        while (!builder.eof()) {
+            val type = builder.tokenType
+            val text = builder.tokenText
+
+            when (type) {
+                LyngTokenTypes.KEYWORD -> {
+                    lastKeyword = text
+                    if (text == "enum") inEnum = true
+                }
+                LyngTokenTypes.PUNCT -> {
+                    if (text == "(") {
+                        parenDepth++
+                        if (lastKeyword == "fun" || lastKeyword == "constructor" || lastKeyword == "init") inParams = true
+                    } else if (text == ")") {
+                        parenDepth--
+                        if (parenDepth == 0) inParams = false
+                    } else if (text == "{") {
+                        braceDepth++
+                    } else if (text == "}") {
+                        braceDepth--
+                        if (braceDepth == 0) inEnum = false
+                    }
+                    if (text != ".") lastKeyword = null
+                }
+                LyngTokenTypes.IDENTIFIER -> {
+                    val m = builder.mark()
+                    builder.advanceLexer()
+                    val nextType = builder.tokenType
+                    val isQualified = nextType == LyngTokenTypes.PUNCT && builder.tokenText == "."
+                    
+                    if (!isQualified) {
+                        when {
+                            lastKeyword in setOf("fun", "val", "var", "class", "enum", "object", "interface", "type", "property") -> {
+                                m.done(LyngElementTypes.NAME_IDENTIFIER)
+                            }
+                            inParams && parenDepth > 0 -> {
+                                m.done(LyngElementTypes.PARAMETER_NAME)
+                            }
+                            inEnum && braceDepth > 0 && parenDepth == 0 -> {
+                                m.done(LyngElementTypes.ENUM_CONSTANT_NAME)
+                            }
+                            else -> m.drop()
+                        }
+                    } else {
+                        m.drop()
+                    }
+                    lastKeyword = null
+                    continue
+                }
+                LyngTokenTypes.WHITESPACE, LyngTokenTypes.LINE_COMMENT, LyngTokenTypes.BLOCK_COMMENT -> {
+                    // keep lastKeyword
+                }
+                else -> lastKeyword = null
+            }
+            builder.advanceLexer()
+        }
         mark.done(root)
         builder.treeBuilt
     }

lyng-idea/src/main/kotlin/net/sergeych/lyng/idea/settings/LyngFormatterSettings.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2025 Sergey S. Chernov real.sergeych@gmail.com
+ * Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -32,24 +32,6 @@ class LyngFormatterSettings(private val project: Project) : PersistentStateCompo
         var reindentClosedBlockOnEnter: Boolean = true,
         var reindentPastedBlocks: Boolean = true,
         var normalizeBlockCommentIndent: Boolean = false,
-        var spellCheckStringLiterals: Boolean = true,
-        // When Grazie/Natural Languages is present, prefer it for comments and literals (avoid legacy duplicates)
-        var preferGrazieForCommentsAndLiterals: Boolean = true,
-        // When Grazie is available, also check identifiers via Grazie.
-        // Default OFF because Grazie typically doesn't flag code identifiers; legacy Spellchecker is better for code.
-        var grazieChecksIdentifiers: Boolean = false,
-        // Grazie-only fallback: treat identifiers as comments domain so Grazie applies spelling rules
-        var grazieTreatIdentifiersAsComments: Boolean = true,
-        // Grazie-only fallback: treat string literals as comments domain when LITERALS domain is not requested
-        var grazieTreatLiteralsAsComments: Boolean = true,
-        // Debug helper: show the exact ranges we feed to Grazie/legacy as weak warnings
-        var debugShowSpellFeed: Boolean = false,
-        // Visuals: render Lyng typos using the standard Typo green underline styling
-        var showTyposWithGreenUnderline: Boolean = true,
-        // Enable lightweight quick-fixes (Replace..., Add to dictionary) without legacy Spell Checker
-        var offerLyngTypoQuickFixes: Boolean = true,
-        // Per-project learned words (do not flag again)
-        var learnedWords: MutableSet<String> = mutableSetOf(),
         // Experimental: enable Lyng autocompletion (can be disabled if needed)
         var enableLyngCompletionExperimental: Boolean = true,
     )
@@ -82,42 +64,6 @@ class LyngFormatterSettings(private val project: Project) : PersistentStateCompo
         get() = myState.normalizeBlockCommentIndent
         set(value) { myState.normalizeBlockCommentIndent = value }
 
-    var spellCheckStringLiterals: Boolean
-        get() = myState.spellCheckStringLiterals
-        set(value) { myState.spellCheckStringLiterals = value }
-
-    var preferGrazieForCommentsAndLiterals: Boolean
-        get() = myState.preferGrazieForCommentsAndLiterals
-        set(value) { myState.preferGrazieForCommentsAndLiterals = value }
-
-    var grazieChecksIdentifiers: Boolean
-        get() = myState.grazieChecksIdentifiers
-        set(value) { myState.grazieChecksIdentifiers = value }
-
-    var grazieTreatIdentifiersAsComments: Boolean
-        get() = myState.grazieTreatIdentifiersAsComments
-        set(value) { myState.grazieTreatIdentifiersAsComments = value }
-
-    var grazieTreatLiteralsAsComments: Boolean
-        get() = myState.grazieTreatLiteralsAsComments
-        set(value) { myState.grazieTreatLiteralsAsComments = value }
-
-    var debugShowSpellFeed: Boolean
-        get() = myState.debugShowSpellFeed
-        set(value) { myState.debugShowSpellFeed = value }
-
-    var showTyposWithGreenUnderline: Boolean
-        get() = myState.showTyposWithGreenUnderline
-        set(value) { myState.showTyposWithGreenUnderline = value }
-
-    var offerLyngTypoQuickFixes: Boolean
-        get() = myState.offerLyngTypoQuickFixes
-        set(value) { myState.offerLyngTypoQuickFixes = value }
-
-    var learnedWords: MutableSet<String>
-        get() = myState.learnedWords
-        set(value) { myState.learnedWords = value }
-
     var enableLyngCompletionExperimental: Boolean
         get() = myState.enableLyngCompletionExperimental
         set(value) { myState.enableLyngCompletionExperimental = value }

lyng-idea/src/main/kotlin/net/sergeych/lyng/idea/settings/LyngFormatterSettingsConfigurable.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2025 Sergey S. Chernov real.sergeych@gmail.com
+ * Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -30,14 +30,6 @@ class LyngFormatterSettingsConfigurable(private val project: Project) : Configur
     private var reindentClosedBlockCb: JCheckBox? = null
     private var reindentPasteCb: JCheckBox? = null
     private var normalizeBlockCommentIndentCb: JCheckBox? = null
-    private var spellCheckLiteralsCb: JCheckBox? = null
-    private var preferGrazieCommentsLiteralsCb: JCheckBox? = null
-    private var grazieChecksIdentifiersCb: JCheckBox? = null
-    private var grazieIdsAsCommentsCb: JCheckBox? = null
-    private var grazieLiteralsAsCommentsCb: JCheckBox? = null
-    private var debugShowSpellFeedCb: JCheckBox? = null
-    private var showTyposGreenCb: JCheckBox? = null
-    private var offerQuickFixesCb: JCheckBox? = null
     private var enableCompletionCb: JCheckBox? = null
 
     override fun getDisplayName(): String = "Lyng Formatter"
@@ -50,14 +42,6 @@ class LyngFormatterSettingsConfigurable(private val project: Project) : Configur
         reindentClosedBlockCb = JCheckBox("Reindent enclosed block on Enter after '}'")
         reindentPasteCb = JCheckBox("Reindent pasted blocks (align pasted code to current indent)")
         normalizeBlockCommentIndentCb = JCheckBox("Normalize block comment indentation [experimental]")
-        spellCheckLiteralsCb = JCheckBox("Spell check string literals (skip % specifiers like %s, %d, %-12s)")
-        preferGrazieCommentsLiteralsCb = JCheckBox("Prefer Natural Languages/Grazie for comments and string literals (avoid duplicates)")
-        grazieChecksIdentifiersCb = JCheckBox("Check identifiers via Natural Languages/Grazie when available")
-        grazieIdsAsCommentsCb = JCheckBox("Natural Languages/Grazie: treat identifiers as comments (forces spelling checks in 2024.3)")
-        grazieLiteralsAsCommentsCb = JCheckBox("Natural Languages/Grazie: treat string literals as comments when literals are not processed")
-        debugShowSpellFeedCb = JCheckBox("Debug: show spell-feed ranges (weak warnings)")
-        showTyposGreenCb = JCheckBox("Show Lyng typos with green underline (TYPO styling)")
-        offerQuickFixesCb = JCheckBox("Offer Lyng typo quick fixes (Replace…, Add to dictionary) without Spell Checker")
         enableCompletionCb = JCheckBox("Enable Lyng autocompletion (experimental)")
 
         // Tooltips / short help
@@ -66,27 +50,12 @@ class LyngFormatterSettingsConfigurable(private val project: Project) : Configur
         reindentClosedBlockCb?.toolTipText = "On Enter after a closing '}', reindent the just-closed {…} block using formatter rules."
         reindentPasteCb?.toolTipText = "When caret is in leading whitespace, reindent the pasted text and align it to the caret's indent."
         normalizeBlockCommentIndentCb?.toolTipText = "Experimental: normalize indentation inside /* … */ comments (code is not modified)."
-        preferGrazieCommentsLiteralsCb?.toolTipText = "When ON and Natural Languages/Grazie is installed, comments and string literals are checked by Grazie. Turn OFF to force legacy Spellchecker to check them."
-        grazieChecksIdentifiersCb?.toolTipText = "When ON and Natural Languages/Grazie is installed, identifiers (non-keywords) are checked by Grazie too."
-        grazieIdsAsCommentsCb?.toolTipText = "Grazie-only fallback: route identifiers as COMMENTS domain so Grazie applies spelling in 2024.3."
-        grazieLiteralsAsCommentsCb?.toolTipText = "Grazie-only fallback: when Grammar doesn't process literals, route strings as COMMENTS so they are checked."
-        debugShowSpellFeedCb?.toolTipText = "Show the exact ranges we feed to spellcheckers (ids/comments/strings) as weak warnings."
-        showTyposGreenCb?.toolTipText = "Render Lyng typos using the platform's green TYPO underline instead of generic warnings."
-        offerQuickFixesCb?.toolTipText = "Provide lightweight Replace… and Add to dictionary quick-fixes without requiring the legacy Spell Checker."
         enableCompletionCb?.toolTipText = "Turn on/off the lightweight Lyng code completion (BASIC)."
         p.add(spacingCb)
         p.add(wrappingCb)
         p.add(reindentClosedBlockCb)
         p.add(reindentPasteCb)
         p.add(normalizeBlockCommentIndentCb)
-        p.add(spellCheckLiteralsCb)
-        p.add(preferGrazieCommentsLiteralsCb)
-        p.add(grazieChecksIdentifiersCb)
-        p.add(grazieIdsAsCommentsCb)
-        p.add(grazieLiteralsAsCommentsCb)
-        p.add(debugShowSpellFeedCb)
-        p.add(showTyposGreenCb)
-        p.add(offerQuickFixesCb)
         p.add(enableCompletionCb)
         panel = p
         reset()
@@ -100,14 +69,6 @@ class LyngFormatterSettingsConfigurable(private val project: Project) : Configur
                 reindentClosedBlockCb?.isSelected != s.reindentClosedBlockOnEnter ||
                 reindentPasteCb?.isSelected != s.reindentPastedBlocks ||
                 normalizeBlockCommentIndentCb?.isSelected != s.normalizeBlockCommentIndent ||
-                spellCheckLiteralsCb?.isSelected != s.spellCheckStringLiterals ||
-                preferGrazieCommentsLiteralsCb?.isSelected != s.preferGrazieForCommentsAndLiterals ||
-                grazieChecksIdentifiersCb?.isSelected != s.grazieChecksIdentifiers ||
-                grazieIdsAsCommentsCb?.isSelected != s.grazieTreatIdentifiersAsComments ||
-                grazieLiteralsAsCommentsCb?.isSelected != s.grazieTreatLiteralsAsComments ||
-                debugShowSpellFeedCb?.isSelected != s.debugShowSpellFeed ||
-                showTyposGreenCb?.isSelected != s.showTyposWithGreenUnderline ||
-                offerQuickFixesCb?.isSelected != s.offerLyngTypoQuickFixes ||
                 enableCompletionCb?.isSelected != s.enableLyngCompletionExperimental
     }
 
@@ -118,14 +79,6 @@ class LyngFormatterSettingsConfigurable(private val project: Project) : Configur
         s.reindentClosedBlockOnEnter = reindentClosedBlockCb?.isSelected == true
         s.reindentPastedBlocks = reindentPasteCb?.isSelected == true
         s.normalizeBlockCommentIndent = normalizeBlockCommentIndentCb?.isSelected == true
-        s.spellCheckStringLiterals = spellCheckLiteralsCb?.isSelected == true
-        s.preferGrazieForCommentsAndLiterals = preferGrazieCommentsLiteralsCb?.isSelected == true
-        s.grazieChecksIdentifiers = grazieChecksIdentifiersCb?.isSelected == true
-        s.grazieTreatIdentifiersAsComments = grazieIdsAsCommentsCb?.isSelected == true
-        s.grazieTreatLiteralsAsComments = grazieLiteralsAsCommentsCb?.isSelected == true
-        s.debugShowSpellFeed = debugShowSpellFeedCb?.isSelected == true
-        s.showTyposWithGreenUnderline = showTyposGreenCb?.isSelected == true
-        s.offerLyngTypoQuickFixes = offerQuickFixesCb?.isSelected == true
         s.enableLyngCompletionExperimental = enableCompletionCb?.isSelected == true
     }
 
@@ -136,14 +89,6 @@ class LyngFormatterSettingsConfigurable(private val project: Project) : Configur
         reindentClosedBlockCb?.isSelected = s.reindentClosedBlockOnEnter
         reindentPasteCb?.isSelected = s.reindentPastedBlocks
         normalizeBlockCommentIndentCb?.isSelected = s.normalizeBlockCommentIndent
-        spellCheckLiteralsCb?.isSelected = s.spellCheckStringLiterals
-        preferGrazieCommentsLiteralsCb?.isSelected = s.preferGrazieForCommentsAndLiterals
-        grazieChecksIdentifiersCb?.isSelected = s.grazieChecksIdentifiers
-        grazieIdsAsCommentsCb?.isSelected = s.grazieTreatIdentifiersAsComments
-        grazieLiteralsAsCommentsCb?.isSelected = s.grazieTreatLiteralsAsComments
-        debugShowSpellFeedCb?.isSelected = s.debugShowSpellFeed
-        showTyposGreenCb?.isSelected = s.showTyposWithGreenUnderline
-        offerQuickFixesCb?.isSelected = s.offerLyngTypoQuickFixes
         enableCompletionCb?.isSelected = s.enableLyngCompletionExperimental
     }
 }

lyng-idea/src/main/kotlin/net/sergeych/lyng/idea/spell/LyngSpellIndex.kt

@@ -1,50 +0,0 @@
-/*
- * Copyright 2025 Sergey S. Chernov real.sergeych@gmail.com
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- */
-package net.sergeych.lyng.idea.spell
-
-import com.intellij.openapi.diagnostic.Logger
-import com.intellij.openapi.util.Key
-import com.intellij.openapi.util.TextRange
-import com.intellij.psi.PsiFile
-
-/**
- * Per-file cached spellcheck index built from MiniAst-based highlighting and the lynglib highlighter.
- * It exposes identifier, comment, and string literal ranges. Strategies should suspend until data is ready.
- */
-object LyngSpellIndex {
-    private val LOG = Logger.getInstance(LyngSpellIndex::class.java)
-
-    data class Data(
-        val modStamp: Long,
-        val identifiers: List<TextRange>,
-        val comments: List<TextRange>,
-        val strings: List<TextRange>,
-    )
-
-    private val KEY: Key<Data> = Key.create("LYNG_SPELL_INDEX")
-
-    fun getUpToDate(file: PsiFile): Data? {
-        val doc = file.viewProvider.document ?: return null
-        val d = file.getUserData(KEY) ?: return null
-        return if (d.modStamp == doc.modificationStamp) d else null
-    }
-
-    fun store(file: PsiFile, data: Data) {
-        file.putUserData(KEY, data)
-        LOG.info("LyngSpellIndex built: ids=${data.identifiers.size}, comments=${data.comments.size}, strings=${data.strings.size}")
-    }
-}

lyng-idea/src/main/kotlin/net/sergeych/lyng/idea/spell/LyngSpellcheckingStrategy.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2025 Sergey S. Chernov real.sergeych@gmail.com
+ * Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,140 +16,26 @@
  */
 package net.sergeych.lyng.idea.spell
 
-// Avoid Tokenizers helper to keep compatibility; implement our own tokenizers
-import com.intellij.ide.plugins.PluginManagerCore
-import com.intellij.openapi.diagnostic.Logger
-import com.intellij.openapi.extensions.PluginId
-import com.intellij.openapi.util.TextRange
 import com.intellij.psi.PsiElement
-import com.intellij.spellchecker.inspections.PlainTextSplitter
 import com.intellij.spellchecker.tokenizer.SpellcheckingStrategy
-import com.intellij.spellchecker.tokenizer.TokenConsumer
 import com.intellij.spellchecker.tokenizer.Tokenizer
-import net.sergeych.lyng.idea.settings.LyngFormatterSettings
+import net.sergeych.lyng.idea.highlight.LyngTokenTypes
+import net.sergeych.lyng.idea.psi.LyngElementTypes
 
 /**
- * Spellchecking strategy for Lyng:
- * - Identifiers: checked as identifiers
- * - Comments: checked as plain text
- * - Keywords: skipped
- * - String literals: optional (controlled by settings), and we exclude printf-style format specifiers like
- *   %s, %d, %-12s, %0.2f, etc.
+ * Standard IntelliJ spellchecking strategy for Lyng.
+ * Uses the simplified PSI structure to identify declarations.
  */
 class LyngSpellcheckingStrategy : SpellcheckingStrategy() {
-
-    private val log = Logger.getInstance(LyngSpellcheckingStrategy::class.java)
-    @Volatile private var loggedOnce = false
-
-    private fun grazieInstalled(): Boolean {
-        // Support both historical and bundled IDs
-        return PluginManagerCore.isPluginInstalled(PluginId.getId("com.intellij.grazie")) ||
-                PluginManagerCore.isPluginInstalled(PluginId.getId("tanvd.grazi"))
-    }
-
-    private fun grazieApiAvailable(): Boolean = try {
-        // If this class is absent (as in IC-243), third-party plugins can't run Grazie programmatically
-        Class.forName("com.intellij.grazie.grammar.GrammarChecker")
-        true
-    } catch (_: Throwable) { false }
-
-    override fun getTokenizer(element: PsiElement): Tokenizer<*> {
-        val hasGrazie = grazieInstalled()
-        val hasGrazieApi = grazieApiAvailable()
-        val settings = LyngFormatterSettings.getInstance(element.project)
-        if (!loggedOnce) {
-            loggedOnce = true
-            log.info("LyngSpellcheckingStrategy activated: hasGrazie=$hasGrazie, grazieApi=$hasGrazieApi, preferGrazieForCommentsAndLiterals=${settings.preferGrazieForCommentsAndLiterals}, spellCheckStringLiterals=${settings.spellCheckStringLiterals}, grazieChecksIdentifiers=${settings.grazieChecksIdentifiers}")
-        }
-
-        val file = element.containingFile ?: return EMPTY_TOKENIZER
-        val index = LyngSpellIndex.getUpToDate(file) ?: run {
-            // Suspend legacy spellcheck until MiniAst-based index is ready
-            return EMPTY_TOKENIZER
-        }
-        val elRange = element.textRange ?: return EMPTY_TOKENIZER
-
-        fun overlaps(list: List<TextRange>) = list.any { it.intersects(elRange) }
-
-        // Decide responsibility per settings
-        // If Grazie is present but its public API is not available (IC-243), do NOT delegate to it.
-        val preferGrazie = hasGrazie && hasGrazieApi && settings.preferGrazieForCommentsAndLiterals
-        val grazieIds = hasGrazie && hasGrazieApi && settings.grazieChecksIdentifiers
-
-        // Identifiers: only if range is within identifiers index and not delegated to Grazie
-        if (overlaps(index.identifiers) && !grazieIds) return IDENTIFIER_TOKENIZER
-
-        // Comments: only if not delegated to Grazie and overlapping indexed comments
-        if (!preferGrazie && overlaps(index.comments)) return COMMENT_TEXT_TOKENIZER
-
-        // Strings: only if not delegated to Grazie, literals checking enabled, and overlapping indexed strings
-        if (!preferGrazie && settings.spellCheckStringLiterals && overlaps(index.strings)) return STRING_WITH_PRINTF_EXCLUDES
-
-        return EMPTY_TOKENIZER
-    }
-
-    private object EMPTY_TOKENIZER : Tokenizer<PsiElement>() {
-        override fun tokenize(element: PsiElement, consumer: TokenConsumer) {}
-    }
-
-    private object IDENTIFIER_TOKENIZER : Tokenizer<PsiElement>() {
-        private val splitter = PlainTextSplitter.getInstance()
-        override fun tokenize(element: PsiElement, consumer: TokenConsumer) {
-            val text = element.text
-            if (text.isNullOrEmpty()) return
-            consumer.consumeToken(element, text, false, 0, TextRange(0, text.length), splitter)
-        }
-    }
-
-    private object COMMENT_TEXT_TOKENIZER : Tokenizer<PsiElement>() {
-        private val splitter = PlainTextSplitter.getInstance()
-        override fun tokenize(element: PsiElement, consumer: TokenConsumer) {
-            val text = element.text
-            if (text.isNullOrEmpty()) return
-            consumer.consumeToken(element, text, false, 0, TextRange(0, text.length), splitter)
-        }
-    }
-
-    private object STRING_WITH_PRINTF_EXCLUDES : Tokenizer<PsiElement>() {
-        private val splitter = PlainTextSplitter.getInstance()
-
-        // Regex for printf-style specifiers: %[flags][width][.precision][length]type
-        // This is intentionally permissive to skip common cases like %s, %d, %-12s, %08x, %.2f, %%
-        private val SPEC = Regex("%(?:[-+ #0]*(?:\\d+)?(?:\\.\\d+)?[a-zA-Z%])")
-
-        override fun tokenize(element: PsiElement, consumer: TokenConsumer) {
-            // Check project settings whether literals should be spell-checked
-            val settings = LyngFormatterSettings.getInstance(element.project)
-            if (!settings.spellCheckStringLiterals) return
-
-            val text = element.text
-            if (text.isEmpty()) return
-
-            // Try to strip surrounding quotes (simple lexer token for Lyng strings)
-            var startOffsetInElement = 0
-            var endOffsetInElement = text.length
-            if (text.length >= 2 && (text.first() == '"' && text.last() == '"' || text.first() == '\'' && text.last() == '\'')) {
-                startOffsetInElement = 1
-                endOffsetInElement = text.length - 1
-            }
-            if (endOffsetInElement <= startOffsetInElement) return
-
-            val content = text.substring(startOffsetInElement, endOffsetInElement)
-
-            var last = 0
-            for (m in SPEC.findAll(content)) {
-                val ms = m.range.first
-                val me = m.range.last + 1
-                if (ms > last) {
-                    val range = TextRange(startOffsetInElement + last, startOffsetInElement + ms)
-                    consumer.consumeToken(element, text, false, 0, range, splitter)
-                }
-                last = me
-            }
-            if (last < content.length) {
-                val range = TextRange(startOffsetInElement + last, startOffsetInElement + content.length)
-                consumer.consumeToken(element, text, false, 0, range, splitter)
-            }
+    override fun getTokenizer(element: PsiElement?): Tokenizer<*> {
+        val type = element?.node?.elementType
+        return when (type) {
+            LyngTokenTypes.LINE_COMMENT, LyngTokenTypes.BLOCK_COMMENT -> TEXT_TOKENIZER
+            LyngTokenTypes.STRING -> TEXT_TOKENIZER
+            LyngElementTypes.NAME_IDENTIFIER,
+            LyngElementTypes.PARAMETER_NAME,
+            LyngElementTypes.ENUM_CONSTANT_NAME -> TEXT_TOKENIZER
+            else -> super.getTokenizer(element)
         }
     }
 }

lyng-idea/src/main/kotlin/net/sergeych/lyng/idea/util/DocsBootstrap.kt

@@ -1,3 +1,20 @@
+/*
+ * Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
 /*
  * Ensure external/bundled docs are registered in BuiltinDocRegistry
  * so completion/quickdoc can resolve things like lyng.io.fs.Path.
@@ -6,6 +23,7 @@ package net.sergeych.lyng.idea.util
 
 import com.intellij.openapi.diagnostic.Logger
 import net.sergeych.lyng.idea.docs.FsDocsFallback
+import net.sergeych.lyng.idea.docs.ProcessDocsFallback
 
 object DocsBootstrap {
     private val log = Logger.getInstance(DocsBootstrap::class.java)
@@ -20,20 +38,32 @@ object DocsBootstrap {
         }
     }
 
-    private fun tryLoadExternal(): Boolean = try {
+    private fun tryLoadExternal(): Boolean {
+        var anyLoaded = false
+        try {
             val cls = Class.forName("net.sergeych.lyngio.docs.FsBuiltinDocs")
             val m = cls.getMethod("ensure")
             m.invoke(null)
             log.info("[LYNG_DEBUG] DocsBootstrap: external docs loaded: net.sergeych.lyngio.docs.FsBuiltinDocs.ensure() OK")
-        true
-    } catch (_: Throwable) {
-        false
+            anyLoaded = true
+        } catch (_: Throwable) {}
+
+        try {
+            val cls = Class.forName("net.sergeych.lyngio.docs.ProcessBuiltinDocs")
+            val m = cls.getMethod("ensure")
+            m.invoke(null)
+            log.info("[LYNG_DEBUG] DocsBootstrap: external docs loaded: net.sergeych.lyngio.docs.ProcessBuiltinDocs.ensure() OK")
+            anyLoaded = true
+        } catch (_: Throwable) {}
+        return anyLoaded
     }
 
     private fun trySeedFallback(): Boolean = try {
-        val seeded = FsDocsFallback.ensureOnce()
+        val seededFs = FsDocsFallback.ensureOnce()
+        val seededProcess = ProcessDocsFallback.ensureOnce()
+        val seeded = seededFs || seededProcess
         if (seeded) {
-            log.info("[LYNG_DEBUG] DocsBootstrap: external docs not found; seeded plugin fallback for lyng.io.fs")
+            log.info("[LYNG_DEBUG] DocsBootstrap: external docs not found; seeded plugin fallback for lyng.io.fs/process")
         } else {
             log.info("[LYNG_DEBUG] DocsBootstrap: external docs not found; no fallback seeded")
         }

lyng-idea/src/main/kotlin/net/sergeych/lyng/idea/util/LyngAstManager.kt

@@ -17,68 +17,105 @@
 
 package net.sergeych.lyng.idea.util
 
+import com.intellij.openapi.application.runReadAction
 import com.intellij.openapi.util.Key
 import com.intellij.psi.PsiFile
+import com.intellij.psi.PsiManager
 import kotlinx.coroutines.runBlocking
-import net.sergeych.lyng.Compiler
-import net.sergeych.lyng.Source
-import net.sergeych.lyng.binding.Binder
 import net.sergeych.lyng.binding.BindingSnapshot
-import net.sergeych.lyng.miniast.MiniAstBuilder
+import net.sergeych.lyng.miniast.DocLookupUtils
 import net.sergeych.lyng.miniast.MiniScript
+import net.sergeych.lyng.tools.IdeLenientImportProvider
+import net.sergeych.lyng.tools.LyngAnalysisRequest
+import net.sergeych.lyng.tools.LyngAnalysisResult
+import net.sergeych.lyng.tools.LyngLanguageTools
 
 object LyngAstManager {
     private val MINI_KEY = Key.create<MiniScript>("lyng.mini.cache")
     private val BINDING_KEY = Key.create<BindingSnapshot>("lyng.binding.cache")
     private val STAMP_KEY = Key.create<Long>("lyng.mini.cache.stamp")
+    private val ANALYSIS_KEY = Key.create<LyngAnalysisResult>("lyng.analysis.cache")
 
-    fun getMiniAst(file: PsiFile): MiniScript? {
-        val doc = file.viewProvider.document ?: return null
-        val stamp = doc.modificationStamp
+    fun getMiniAst(file: PsiFile): MiniScript? = runReadAction {
+        getAnalysis(file)?.mini
+    }
+
+    fun getCombinedStamp(file: PsiFile): Long = runReadAction {
+        var combinedStamp = file.viewProvider.modificationStamp
+        if (!file.name.endsWith(".lyng.d")) {
+            collectDeclarationFiles(file).forEach { df ->
+                combinedStamp += df.viewProvider.modificationStamp
+            }
+        }
+        combinedStamp
+    }
+
+    private fun collectDeclarationFiles(file: PsiFile): List<PsiFile> = runReadAction {
+        val psiManager = PsiManager.getInstance(file.project)
+        var current = file.virtualFile?.parent
+        val seen = mutableSetOf<String>()
+        val result = mutableListOf<PsiFile>()
+
+        while (current != null) {
+            for (child in current.children) {
+                if (child.name.endsWith(".lyng.d") && child != file.virtualFile && seen.add(child.path)) {
+                    val psiD = psiManager.findFile(child) ?: continue
+                    result.add(psiD)
+                }
+            }
+            current = current.parent
+        }
+        result
+    }
+
+    fun getBinding(file: PsiFile): BindingSnapshot? = runReadAction {
+        getAnalysis(file)?.binding
+    }
+
+    fun getAnalysis(file: PsiFile): LyngAnalysisResult? = runReadAction {
+        val vFile = file.virtualFile ?: return@runReadAction null
+        val combinedStamp = getCombinedStamp(file)
         val prevStamp = file.getUserData(STAMP_KEY)
-        val cached = file.getUserData(MINI_KEY)
-        if (cached != null && prevStamp != null && prevStamp == stamp) return cached
+        val cached = file.getUserData(ANALYSIS_KEY)
+        if (cached != null && prevStamp != null && prevStamp == combinedStamp) return@runReadAction cached
 
-        val text = doc.text
-        val sink = MiniAstBuilder()
+        val text = file.viewProvider.contents.toString()
         val built = try {
             val provider = IdeLenientImportProvider.create()
-            val src = Source(file.name, text)
-            runBlocking { Compiler.compileWithMini(src, provider, sink) }
-            sink.build()
-        } catch (_: Throwable) {
-            sink.build()
+            runBlocking {
+                LyngLanguageTools.analyze(
+                    LyngAnalysisRequest(text = text, fileName = file.name, importProvider = provider)
+                )
             }
-
-        if (built != null) {
-            file.putUserData(MINI_KEY, built)
-            file.putUserData(STAMP_KEY, stamp)
-            // Invalidate binding too
-            file.putUserData(BINDING_KEY, null)
-        }
-        return built
-    }
-
-    fun getBinding(file: PsiFile): BindingSnapshot? {
-        val doc = file.viewProvider.document ?: return null
-        val stamp = doc.modificationStamp
-        val prevStamp = file.getUserData(STAMP_KEY)
-        val cached = file.getUserData(BINDING_KEY)
-        
-        if (cached != null && prevStamp != null && prevStamp == stamp) return cached
-        
-        val mini = getMiniAst(file) ?: return null
-        val text = doc.text
-        val binding = try {
-            Binder.bind(text, mini)
         } catch (_: Throwable) {
             null
         }
 
-        if (binding != null) {
-            file.putUserData(BINDING_KEY, binding)
-            // stamp is already set by getMiniAst
+        if (built != null) {
+            val merged = built.mini
+            if (merged != null && !file.name.endsWith(".lyng.d")) {
+                val dFiles = collectDeclarationFiles(file)
+                for (df in dFiles) {
+                    val dAnalysis = getAnalysis(df)
+                    val dMini = dAnalysis?.mini ?: continue
+                    merged.declarations.addAll(dMini.declarations)
+                    merged.imports.addAll(dMini.imports)
                 }
-        return binding
+            }
+            val finalAnalysis = if (merged != null) {
+                built.copy(
+                    mini = merged,
+                    importedModules = DocLookupUtils.canonicalImportedModules(merged, text)
+                )
+            } else {
+                built
+            }
+            file.putUserData(ANALYSIS_KEY, finalAnalysis)
+            file.putUserData(MINI_KEY, finalAnalysis.mini)
+            file.putUserData(BINDING_KEY, finalAnalysis.binding)
+            file.putUserData(STAMP_KEY, combinedStamp)
+            return@runReadAction finalAnalysis
+        }
+        null
     }
 }

lyng-idea/src/main/resources/META-INF/grazie-bundled.xml

@@ -1,5 +1,5 @@
 <!--
-  ~ Copyright 2025 Sergey S. Chernov real.sergeych@gmail.com
+  ~ Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
   ~
   ~ Licensed under the Apache License, Version 2.0 (the "License");
   ~ you may not use this file except in compliance with the License.
@@ -20,8 +20,6 @@
 -->
 <idea-plugin>
     <extensions defaultExtensionNs="com.intellij">
-        <grazie.grammar.strategy language="Lyng"
-                                  implementationClass="net.sergeych.lyng.idea.grazie.LyngGrazieStrategy"/>
         <!-- Provide text extraction for Lyng PSI so Grazie (bundled Natural Languages) can check content -->
         <grazie.textExtractor language="Lyng"
                               implementationClass="net.sergeych.lyng.idea.grazie.LyngTextExtractor"/>

lyng-idea/src/main/resources/META-INF/grazie-lite.xml

@@ -1,5 +1,5 @@
 <!--
-  ~ Copyright 2025 Sergey S. Chernov real.sergeych@gmail.com
+  ~ Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
   ~
   ~ Licensed under the Apache License, Version 2.0 (the "License");
   ~ you may not use this file except in compliance with the License.
@@ -21,8 +21,6 @@
 -->
 <idea-plugin>
     <extensions defaultExtensionNs="com.intellij">
-        <grazie.grammar.strategy language="Lyng"
-                                  implementationClass="net.sergeych.lyng.idea.grazie.LyngGrazieStrategy"/>
         <!-- Provide text extraction for Lyng PSI so Grazie can actually check content -->
         <grazie.textExtractor language="Lyng"
                               implementationClass="net.sergeych.lyng.idea.grazie.LyngTextExtractor"/>

lyng-idea/src/main/resources/META-INF/plugin.xml

@@ -16,10 +16,10 @@
   -->
 
 <idea-plugin>
-    <!-- Open-ended compatibility: 2024.3+ (build 243 and newer) -->
-    <idea-version since-build="243"/>
+    <!-- Open-ended compatibility: 2024.1+ (build 241 and newer) -->
+    <idea-version since-build="241"/>
     <id>net.sergeych.lyng.idea</id>
-    <name>Lyng Language Support</name>
+    <name>Lyng</name>
     <vendor email="real.sergeych@gmail.com">Sergey Chernov</vendor>
 
     <description>
@@ -43,6 +43,7 @@
     <extensions defaultExtensionNs="com.intellij">
         <!-- Language and file type -->
         <fileType implementationClass="net.sergeych.lyng.idea.LyngFileType" name="Lyng" extensions="lyng" fieldName="INSTANCE" language="Lyng"/>
+        <fileTypeFactory implementation="net.sergeych.lyng.idea.LyngFileTypeFactory"/>
 
         <!-- Minimal parser/PSI to fully wire editor services for the language -->
         <lang.parserDefinition language="Lyng" implementationClass="net.sergeych.lyng.idea.psi.LyngParserDefinition"/>
@@ -56,9 +57,6 @@
         <!-- External annotator for semantic highlighting -->
         <externalAnnotator language="Lyng" implementationClass="net.sergeych.lyng.idea.annotators.LyngExternalAnnotator"/>
 
-        <!-- Grazie-backed spell/grammar annotator (runs only when Grazie is installed) -->
-        <externalAnnotator language="Lyng" implementationClass="net.sergeych.lyng.idea.grazie.LyngGrazieAnnotator"/>
-
         <!-- Quick documentation provider bound to Lyng language -->
         <lang.documentationProvider language="Lyng" implementationClass="net.sergeych.lyng.idea.docs.LyngDocumentationProvider"/>
 
@@ -104,5 +102,15 @@
 
     </extensions>
 
-    <actions/>
+    <actions>
+        <action id="net.sergeych.lyng.idea.actions.RunLyngScriptAction"
+                class="net.sergeych.lyng.idea.actions.RunLyngScriptAction"
+                text="Run Lyng Script"
+                description="Run the current Lyng script and show output in console">
+            <add-to-group group-id="EditorPopupMenu" anchor="last"/>
+            <add-to-group group-id="ProjectViewPopupMenu" anchor="last"/>
+            <add-to-group group-id="RunMenu" anchor="last"/>
+            <keyboard-shortcut keymap="$default" first-keystroke="control shift F10"/>
+        </action>
+    </actions>
 </idea-plugin>

lyng-idea/src/main/resources/META-INF/spellchecker.xml

@@ -1,5 +1,5 @@
 <!--
-  ~ Copyright 2025 Sergey S. Chernov real.sergeych@gmail.com
+  ~ Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
   ~
   ~ Licensed under the Apache License, Version 2.0 (the "License");
   ~ you may not use this file except in compliance with the License.
@@ -22,7 +22,6 @@
 -->
 <idea-plugin>
     <extensions defaultExtensionNs="com.intellij">
-        <!-- Spellchecker strategy: identifiers + comments; literals configurable, skipping printf-like specs -->
         <spellchecker.support language="Lyng"
                                implementationClass="net.sergeych.lyng.idea.spell.LyngSpellcheckingStrategy"/>
     </extensions>

lyng-idea/src/main/resources/dictionaries/en-basic.txt

@@ -1,466 +0,0 @@
-the
-be
-to
-of
-and
-a
-in
-that
-have
-I
-it
-for
-not
-on
-with
-he
-as
-you
-do
-at
-this
-but
-his
-by
-from
-they
-we
-say
-her
-she
-or
-an
-will
-my
-one
-all
-would
-there
-their
-what
-so
-up
-out
-if
-about
-who
-get
-which
-go
-me
-when
-make
-can
-like
-time
-no
-just
-him
-know
-take
-people
-into
-year
-your
-good
-some
-could
-them
-see
-other
-than
-then
-now
-look
-only
-come
-its
-over
-think
-also
-back
-after
-use
-two
-how
-our
-work
-first
-well
-way
-even
-new
-want
-because
-any
-these
-give
-day
-most
-us
-is
-are
-was
-were
-been
-being
-does
-did
-done
-has
-had
-having
-may
-might
-must
-shall
-should
-ought
-need
-used
-here
-therefore
-where
-why
-while
-until
-since
-before
-afterward
-between
-among
-without
-within
-through
-across
-against
-toward
-upon
-above
-below
-under
-around
-near
-far
-early
-late
-often
-always
-never
-seldom
-sometimes
-usually
-really
-very
-quite
-rather
-almost
-already
-again
-still
-yet
-soon
-today
-tomorrow
-yesterday
-number
-string
-boolean
-true
-false
-null
-none
-file
-files
-path
-paths
-line
-lines
-word
-words
-count
-value
-values
-name
-names
-title
-text
-message
-error
-errors
-warning
-warnings
-info
-information
-debug
-trace
-format
-printf
-specifier
-specifiers
-pattern
-patterns
-match
-matches
-regex
-version
-versions
-module
-modules
-package
-packages
-import
-imports
-export
-exports
-class
-classes
-object
-objects
-function
-functions
-method
-methods
-parameter
-parameters
-argument
-arguments
-variable
-variables
-constant
-constants
-type
-types
-generic
-generics
-map
-maps
-list
-lists
-array
-arrays
-set
-sets
-queue
-stack
-graph
-tree
-node
-nodes
-edge
-edges
-pair
-pairs
-key
-keys
-value
-values
-index
-indices
-length
-size
-empty
-contains
-equals
-compare
-greater
-less
-minimum
-maximum
-average
-sum
-total
-random
-round
-floor
-ceil
-sin
-cos
-tan
-sqrt
-abs
-min
-max
-read
-write
-open
-close
-append
-create
-delete
-remove
-update
-save
-load
-start
-stop
-run
-execute
-return
-break
-continue
-try
-catch
-finally
-throw
-throws
-if
-else
-when
-while
-for
-loop
-range
-case
-switch
-default
-optional
-required
-enable
-disable
-enabled
-disabled
-visible
-hidden
-public
-private
-protected
-internal
-external
-inline
-override
-abstract
-sealed
-open
-final
-static
-const
-lazy
-late
-init
-initialize
-configuration
-settings
-option
-options
-preference
-preferences
-project
-projects
-module
-modules
-build
-builds
-compile
-compiles
-compiler
-test
-tests
-testing
-assert
-assertion
-result
-results
-success
-failure
-status
-state
-context
-scope
-scopes
-token
-tokens
-identifier
-identifiers
-keyword
-keywords
-comment
-comments
-string
-strings
-literal
-literals
-formatting
-formatter
-spell
-spelling
-dictionary
-dictionaries
-language
-languages
-natural
-grazie
-typo
-typos
-suggest
-suggestion
-suggestions
-replace
-replacement
-replacements
-learn
-learned
-learns
-filter
-filters
-exclude
-excludes
-include
-includes
-bundle
-bundled
-resource
-resources
-gzipped
-plain
-text
-editor
-editors
-inspection
-inspections
-highlight
-highlighting
-underline
-underlines
-style
-styles
-range
-ranges
-offset
-offsets
-position
-positions
-apply
-applies
-provides
-present
-absent
-available
-unavailable
-version
-build
-platform
-ide
-intellij
-plugin
-plugins
-sandbox
-gradle
-kotlin
-java
-linux
-macos
-windows
-unix
-system
-systems
-support
-supports
-compatible
-compatibility
-fallback
-native
-automatic
-autoswitch
-switch
-switches

lyng-idea/src/main/resources/dictionaries/tech-lyng.txt

@@ -1,282 +0,0 @@
-# Lyng/tech vocabulary – one word per line, lowercase
-lyng
-miniast
-binder
-printf
-specifier
-specifiers
-regex
-regexp
-token
-tokens
-lexer
-parser
-syntax
-semantic
-highlight
-highlighting
-underline
-typo
-typos
-dictionary
-dictionaries
-grazie
-natural
-languages
-inspection
-inspections
-annotation
-annotator
-annotations
-quickfix
-quickfixes
-intention
-intentions
-replacement
-replacements
-identifier
-identifiers
-keyword
-keywords
-comment
-comments
-string
-strings
-literal
-literals
-formatting
-formatter
-splitter
-camelcase
-snakecase
-pascalcase
-uppercase
-lowercase
-titlecase
-case
-cases
-project
-module
-modules
-resource
-resources
-bundle
-bundled
-gzipped
-plaintext
-text
-range
-ranges
-offset
-offsets
-position
-positions
-apply
-applies
-runtime
-compile
-build
-artifact
-artifacts
-plugin
-plugins
-intellij
-idea
-sandbox
-gradle
-kotlin
-java
-jvm
-coroutines
-suspend
-scope
-scopes
-context
-contexts
-tokenizer
-tokenizers
-spell
-spelling
-spellcheck
-spellchecker
-fallback
-native
-autoswitch
-switch
-switching
-enable
-disable
-enabled
-disabled
-setting
-settings
-preference
-preferences
-editor
-filetype
-filetypes
-language
-languages
-psi
-psielement
-psifile
-textcontent
-textdomain
-stealth
-stealthy
-printfspec
-format
-formats
-pattern
-patterns
-match
-matches
-group
-groups
-node
-nodes
-tree
-graph
-edge
-edges
-pair
-pairs
-map
-maps
-list
-lists
-array
-arrays
-set
-sets
-queue
-stack
-index
-indices
-length
-size
-empty
-contains
-equals
-compare
-greater
-less
-minimum
-maximum
-average
-sum
-total
-random
-round
-floor
-ceil
-sin
-cos
-tan
-sqrt
-abs
-min
-max
-read
-write
-open
-close
-append
-create
-delete
-remove
-update
-save
-load
-start
-stop
-run
-execute
-return
-break
-continue
-try
-catch
-finally
-throw
-throws
-if
-else
-when
-while
-for
-loop
-rangeop
-caseop
-switchop
-default
-optional
-required
-public
-private
-protected
-internal
-external
-inline
-override
-abstract
-sealed
-open
-final
-static
-const
-lazy
-late
-init
-initialize
-configuration
-option
-options
-projectwide
-workspace
-crossplatform
-multiplatform
-commonmain
-jsmain
-native
-platform
-api
-implementation
-dependency
-dependencies
-classpath
-source
-sources
-document
-documents
-logging
-logger
-info
-debug
-trace
-warning
-error
-severity
-severitylevel
-intentionaction
-daemon
-daemoncodeanalyzer
-restart
-textattributes
-textattributeskey
-typostyle
-learned
-learn
-tech
-vocabulary
-domain
-term
-terms
-us
-uk
-american
-british
-colour
-color
-organisation
-organization

lyng-idea/src/test/kotlin/net/sergeych/lyng/idea/completion/LyngCompletionMemberTest.kt

@@ -1,3 +1,20 @@
+/*
+ * Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
 package net.sergeych.lyng.idea.completion
 
 import com.intellij.testFramework.fixtures.BasePlatformTestCase
@@ -118,4 +135,41 @@ class LyngCompletionMemberTest : BasePlatformTestCase() {
         // Heuristic: we expect more than a couple of items (not just size/toList)
         assertTrue("Too few member suggestions after list literal: $items", items.size >= 3)
     }
+
+    fun test_ProcessModule_Completion() {
+        val code = """
+            import lyng.io.process
+            Process.<caret>
+        """.trimIndent()
+        val imported = listOf("lyng.io.process")
+        ensureDocs(imported)
+
+        val items = complete(code)
+        assertTrue("Should contain 'execute'", items.contains("execute"))
+        assertTrue("Should contain 'shell'", items.contains("shell"))
+    }
+
+    fun test_RunningProcess_Completion() {
+        val code = """
+            import lyng.io.process
+            val p = Process.shell("ls")
+            p.<caret>
+        """.trimIndent()
+        val imported = listOf("lyng.io.process")
+        ensureDocs(imported)
+
+        val items = complete(code)
+        assertTrue("Should contain 'stdout'", items.contains("stdout"))
+        assertTrue("Should contain 'waitFor'", items.contains("waitFor"))
+        assertTrue("Should contain 'signal'", items.contains("signal"))
+    }
+
+    fun test_RegistryDirect() {
+        DocsBootstrap.ensure()
+        val docs = BuiltinDocRegistry.docsForModule("lyng.io.process")
+        assertTrue("Docs for lyng.io.process should not be empty", docs.isNotEmpty())
+        val processClass = docs.filterIsInstance<MiniClassDecl>().firstOrNull { it.name == "Process" }
+        assertNotNull("Should contain Process class", processClass)
+        assertTrue("Process should have members", processClass!!.members.isNotEmpty())
+    }
 }

lyng/src/commonMain/kotlin/Common.kt

@@ -27,6 +27,7 @@ import com.github.ajalt.clikt.parameters.arguments.optional
 import com.github.ajalt.clikt.parameters.options.flag
 import com.github.ajalt.clikt.parameters.options.option
 import kotlinx.coroutines.runBlocking
+import net.sergeych.lyng.Compiler
 import net.sergeych.lyng.LyngVersion
 import net.sergeych.lyng.Script
 import net.sergeych.lyng.ScriptError
@@ -167,7 +168,7 @@ private class Lyng(val launcher: (suspend () -> Unit) -> Unit) : CliktCommand()
 
     override fun help(context: Context): String =
         """
-            The Lyng script language interpreter, language version is $LyngVersion.
+            The Lyng script language runtime, language version is $LyngVersion.
             
             Please refer form more information to the project site:
             https://gitea.sergeych.net/SergeychWorks/lyng
@@ -198,7 +199,12 @@ private class Lyng(val launcher: (suspend () -> Unit) -> Unit) : CliktCommand()
                     launcher {
                         // there is no script name, it is a first argument instead:
                         processErrors {
-                            baseScope.eval(execute!!)
+                            val script = Compiler.compileWithResolution(
+                                Source("<eval>", execute!!),
+                                baseScope.currentImportProvider,
+                                seedScope = baseScope
+                            )
+                            script.execute(baseScope)
                         }
                     }
                 }
@@ -236,7 +242,13 @@ suspend fun executeFile(fileName: String) {
         text = text.substring(pos + 1)
     }
     processErrors {
-        baseScopeDefer.await().eval(Source(fileName, text))
+        val scope = baseScopeDefer.await()
+        val script = Compiler.compileWithResolution(
+            Source(fileName, text),
+            scope.currentImportProvider,
+            seedScope = scope
+        )
+        script.execute(scope)
     }
 }
 

lyng/src/jvmTest/kotlin/net/sergeych/lyng_cli/FsIntegrationJvmTest.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2025 Sergey S. Chernov real.sergeych@gmail.com
+ * Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -56,7 +56,7 @@ class FsIntegrationJvmTest {
                 """
                     import lyng.io.fs
                     // list current folder files
-                    println( Path(".").list().toList() )
+                    println( Path(".").list() )
                     """.trimIndent()
             )
         }

lyngio/build.gradle.kts

@@ -1,5 +1,5 @@
 /*
- * Copyright 2025 Sergey S. Chernov real.sergeych@gmail.com
+ * Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -20,7 +20,6 @@
  */
 
 import org.jetbrains.kotlin.gradle.ExperimentalKotlinGradlePluginApi
-import org.jetbrains.kotlin.gradle.ExperimentalWasmDsl
 import org.jetbrains.kotlin.gradle.dsl.JvmTarget
 
 plugins {
@@ -33,6 +32,7 @@ group = "net.sergeych"
 version = "0.0.1-SNAPSHOT"
 
 kotlin {
+    jvmToolchain(17)
     jvm()
     androidTarget {
         publishLibraryVariants("release")
@@ -53,11 +53,11 @@ kotlin {
         browser()
         nodejs()
     }
-    @OptIn(ExperimentalWasmDsl::class)
-    wasmJs() {
-        browser()
-        nodejs()
-    }
+//    @OptIn(ExperimentalWasmDsl::class)
+//    wasmJs() {
+//        browser()
+//        nodejs()
+//    }
 
     // Keep expect/actual warning suppressed consistently with other modules
     targets.configureEach {
@@ -94,13 +94,13 @@ kotlin {
                 implementation("com.squareup.okio:okio-nodefilesystem:${libs.versions.okioVersion.get()}")
             }
         }
-        // For Wasm we use in-memory VFS for now
-        val wasmJsMain by getting {
-            dependencies {
-                api(libs.okio)
-                implementation(libs.okio.fakefilesystem)
-            }
-        }
+//        // For Wasm we use in-memory VFS for now
+//        val wasmJsMain by getting {
+//            dependencies {
+//                api(libs.okio)
+//                implementation(libs.okio.fakefilesystem)
+//            }
+//        }
     }
 }
 

lyngio/src/androidMain/kotlin/net/sergeych/lyngio/process/PlatformAndroid.kt

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package net.sergeych.lyngio.process
+
+actual fun getPlatformDetails(): PlatformDetails {
+    return PlatformDetails(
+        name = "Android",
+        version = android.os.Build.VERSION.RELEASE,
+        arch = android.os.Build.SUPPORTED_ABIS.firstOrNull() ?: "unknown",
+        kernelVersion = System.getProperty("os.version")
+    )
+}
+
+actual fun isProcessSupported(): Boolean = false
+
+actual fun getSystemProcessRunner(): LyngProcessRunner {
+    throw UnsupportedOperationException("Processes are not supported on Android yet")
+}

lyngio/src/commonMain/kotlin/net/sergeych/lyng/io/fs/LyngFsModule.kt

@@ -23,6 +23,8 @@ package net.sergeych.lyng.io.fs
 
 import net.sergeych.lyng.ModuleScope
 import net.sergeych.lyng.Scope
+import net.sergeych.lyng.ScopeFacade
+import net.sergeych.lyng.requireScope
 import net.sergeych.lyng.miniast.*
 import net.sergeych.lyng.obj.*
 import net.sergeych.lyng.pacman.ImportManager
@@ -437,7 +439,7 @@ private suspend fun buildFsModule(module: ModuleScope, policy: FsAccessPolicy) {
             moduleName = module.packageName
         ) {
             fsGuard {
-                val chunkIt = thisObj.invokeInstanceMethod(this, "readUtf8Chunks")
+                val chunkIt = thisObj.invokeInstanceMethod(requireScope(), "readUtf8Chunks")
                 ObjFsLinesIterator(chunkIt)
             }
         }
@@ -463,7 +465,7 @@ private suspend fun buildFsModule(module: ModuleScope, policy: FsAccessPolicy) {
 
 // --- Helper classes and utilities ---
 
-private fun parsePathArg(scope: Scope, self: ObjPath, arg: Obj): LyngPath {
+private fun parsePathArg(scope: ScopeFacade, self: ObjPath, arg: Obj): LyngPath {
     return when (arg) {
         is ObjString -> arg.value.toPath()
         is ObjPath -> arg.path
@@ -472,11 +474,11 @@ private fun parsePathArg(scope: Scope, self: ObjPath, arg: Obj): LyngPath {
 }
 
 // Map Fs access denials to Lyng runtime exceptions for script-friendly errors
-private suspend inline fun Scope.fsGuard(crossinline block: suspend () -> Obj): Obj {
+private suspend inline fun ScopeFacade.fsGuard(crossinline block: suspend () -> Obj): Obj {
     return try {
         block()
     } catch (e: AccessDeniedException) {
-        raiseError(ObjIllegalOperationException(this, e.reasonDetail ?: "access denied"))
+        raiseError(ObjIllegalOperationException(requireScope(), e.reasonDetail ?: "access denied"))
     }
 }
 
@@ -668,16 +670,17 @@ class ObjFsLinesIterator(
         }
     }
 
-    private suspend fun ensureBufferFilled(scope: Scope) {
+    private suspend fun ensureBufferFilled(scope: ScopeFacade) {
         if (buffer.contains('\n') || exhausted) return
+        val actualScope = scope.requireScope()
         // Pull next chunk from the underlying iterator
-        val it = chunksIterator.invokeInstanceMethod(scope, "iterator")
-        val hasNext = it.invokeInstanceMethod(scope, "hasNext").toBool()
+        val it = chunksIterator.invokeInstanceMethod(actualScope, "iterator")
+        val hasNext = it.invokeInstanceMethod(actualScope, "hasNext").toBool()
         if (!hasNext) {
             exhausted = true
             return
         }
-        val next = it.invokeInstanceMethod(scope, "next")
+        val next = it.invokeInstanceMethod(actualScope, "next")
         buffer += next.toString()
     }
 }

lyngio/src/commonMain/kotlin/net/sergeych/lyng/io/process/LyngProcessModule.kt

@@ -0,0 +1,236 @@
+/*
+ * Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package net.sergeych.lyng.io.process
+
+import kotlinx.coroutines.flow.Flow
+import net.sergeych.lyng.ModuleScope
+import net.sergeych.lyng.Scope
+import net.sergeych.lyng.ScopeFacade
+import net.sergeych.lyng.requireScope
+import net.sergeych.lyng.miniast.*
+import net.sergeych.lyng.obj.*
+import net.sergeych.lyng.pacman.ImportManager
+import net.sergeych.lyngio.process.*
+import net.sergeych.lyngio.process.security.ProcessAccessDeniedException
+import net.sergeych.lyngio.process.security.ProcessAccessPolicy
+
+/**
+ * Install Lyng module `lyng.io.process` into the given scope's ImportManager.
+ */
+fun createProcessModule(policy: ProcessAccessPolicy, scope: Scope): Boolean =
+    createProcessModule(policy, scope.importManager)
+
+/** Same as [createProcessModule] but with explicit [ImportManager]. */
+fun createProcessModule(policy: ProcessAccessPolicy, manager: ImportManager): Boolean {
+    val name = "lyng.io.process"
+    if (manager.packageNames.contains(name)) return false
+
+    manager.addPackage(name) { module ->
+        buildProcessModule(module, policy)
+    }
+    return true
+}
+
+private suspend fun buildProcessModule(module: ModuleScope, policy: ProcessAccessPolicy) {
+    val runner = try {
+        SecuredLyngProcessRunner(getSystemProcessRunner(), policy)
+    } catch (e: Exception) {
+        null
+    }
+
+    val runningProcessType = object : ObjClass("RunningProcess") {}
+    
+    runningProcessType.apply {
+        addFnDoc(
+            name = "stdout",
+            doc = "Get standard output stream as a Flow of lines.",
+            returns = type("lyng.Flow"),
+            moduleName = module.packageName
+        ) {
+            val self = thisAs<ObjRunningProcess>()
+            self.process.stdout.toLyngFlow(this)
+        }
+        addFnDoc(
+            name = "stderr",
+            doc = "Get standard error stream as a Flow of lines.",
+            returns = type("lyng.Flow"),
+            moduleName = module.packageName
+        ) {
+            val self = thisAs<ObjRunningProcess>()
+            self.process.stderr.toLyngFlow(this)
+        }
+        addFnDoc(
+            name = "signal",
+            doc = "Send a signal to the process (e.g. 'SIGINT', 'SIGTERM', 'SIGKILL').",
+            params = listOf(ParamDoc("signal", type("lyng.String"))),
+            moduleName = module.packageName
+        ) {
+            processGuard {
+                val sigStr = requireOnlyArg<ObjString>().value.uppercase()
+                val sig = try {
+                    ProcessSignal.valueOf(sigStr)
+                } catch (e: Exception) {
+                    try {
+                        ProcessSignal.valueOf("SIG$sigStr")
+                    } catch (e2: Exception) {
+                        raiseIllegalArgument("Unknown signal: $sigStr")
+                    }
+                }
+                thisAs<ObjRunningProcess>().process.sendSignal(sig)
+                ObjVoid
+            }
+        }
+        addFnDoc(
+            name = "waitFor",
+            doc = "Wait for the process to exit and return its exit code.",
+            returns = type("lyng.Int"),
+            moduleName = module.packageName
+        ) {
+            processGuard {
+                thisAs<ObjRunningProcess>().process.waitFor().toObj()
+            }
+        }
+        addFnDoc(
+            name = "destroy",
+            doc = "Forcefully terminate the process.",
+            moduleName = module.packageName
+        ) {
+            thisAs<ObjRunningProcess>().process.destroy()
+            ObjVoid
+        }
+    }
+
+    val processType = object : ObjClass("Process") {}
+    
+    processType.apply {
+        addClassFnDoc(
+            name = "execute",
+            doc = "Execute a process with arguments.",
+            params = listOf(ParamDoc("executable", type("lyng.String")), ParamDoc("args", type("lyng.List"))),
+            returns = type("RunningProcess"),
+            moduleName = module.packageName
+        ) {
+            if (runner == null) raiseError("Processes are not supported on this platform")
+            processGuard {
+                val executable = requiredArg<ObjString>(0).value
+                val args = requiredArg<ObjList>(1).list.map { it.toString() }
+                val lp = runner.execute(executable, args)
+                ObjRunningProcess(runningProcessType, lp)
+            }
+        }
+        addClassFnDoc(
+            name = "shell",
+            doc = "Execute a command via system shell.",
+            params = listOf(ParamDoc("command", type("lyng.String"))),
+            returns = type("RunningProcess"),
+            moduleName = module.packageName
+        ) {
+            if (runner == null) raiseError("Processes are not supported on this platform")
+            processGuard {
+                val command = requireOnlyArg<ObjString>().value
+                val lp = runner.shell(command)
+                ObjRunningProcess(runningProcessType, lp)
+            }
+        }
+    }
+
+    val platformType = object : ObjClass("Platform") {}
+    
+    platformType.apply {
+        addClassFnDoc(
+            name = "details",
+            doc = "Get platform core details.",
+            returns = type("lyng.Map"),
+            moduleName = module.packageName
+        ) {
+            val d = getPlatformDetails()
+            ObjMap(mutableMapOf(
+                ObjString("name") to ObjString(d.name),
+                ObjString("version") to ObjString(d.version),
+                ObjString("arch") to ObjString(d.arch),
+                ObjString("kernelVersion") to (d.kernelVersion?.toObj() ?: ObjNull)
+            ))
+        }
+        addClassFnDoc(
+            name = "isSupported",
+            doc = "Check if processes are supported on this platform.",
+            returns = type("lyng.Bool"),
+            moduleName = module.packageName
+        ) {
+            isProcessSupported().toObj()
+        }
+    }
+
+    module.addConstDoc(
+        name = "Process",
+        value = processType,
+        doc = "Process execution and control.",
+        type = type("Process"),
+        moduleName = module.packageName
+    )
+    module.addConstDoc(
+        name = "Platform",
+        value = platformType,
+        doc = "Platform information.",
+        type = type("Platform"),
+        moduleName = module.packageName
+    )
+    module.addConstDoc(
+        name = "RunningProcess",
+        value = runningProcessType,
+        doc = "Handle to a running process.",
+        type = type("RunningProcess"),
+        moduleName = module.packageName
+    )
+}
+
+class ObjRunningProcess(
+    override val objClass: ObjClass,
+    val process: LyngProcess
+) : Obj() {
+    override fun toString(): String = "RunningProcess($process)"
+}
+
+private suspend inline fun ScopeFacade.processGuard(crossinline block: suspend () -> Obj): Obj {
+    return try {
+        block()
+    } catch (e: ProcessAccessDeniedException) {
+        raiseError(ObjIllegalOperationException(requireScope(), e.reasonDetail ?: "process access denied"))
+    } catch (e: Exception) {
+        raiseError(ObjIllegalOperationException(requireScope(), e.message ?: "process error"))
+    }
+}
+
+private fun Flow<String>.toLyngFlow(flowScope: ScopeFacade): ObjFlow {
+    val producer = net.sergeych.lyng.obj.ObjExternCallable.fromBridge {
+        val scope = requireScope()
+        val builder = (scope as? net.sergeych.lyng.BytecodeClosureScope)?.callScope?.thisObj as? ObjFlowBuilder
+            ?: scope.thisObj as? ObjFlowBuilder
+
+        this@toLyngFlow.collect {
+            try {
+                builder?.output?.send(ObjString(it))
+            } catch (e: Exception) {
+                // Channel closed or other error, stop collecting
+                return@collect
+            }
+        }
+        ObjVoid
+    }
+    return ObjFlow(producer, flowScope.requireScope())
+}

lyngio/src/commonMain/kotlin/net/sergeych/lyngio/docs/FsBuiltinDocs.kt

@@ -1,3 +1,20 @@
+/*
+ * Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
 /*
  * Filesystem module builtin docs registration, located in lyngio so core library
  * does not depend on external packages. The IDEA plugin (and any other tooling)
@@ -22,43 +39,174 @@ object FsBuiltinDocs {
                 name = "Path",
                 doc = "Filesystem path class. Construct with a string: `Path(\"/tmp\")`."
             ) {
-                // Common instance methods (subset sufficient for Quick Docs)
+                method(
+                    name = "name",
+                    doc = "Base name of the path (last segment).",
+                    returns = type("lyng.String")
+                )
+                method(
+                    name = "parent",
+                    doc = "Parent directory as a Path or null if none.",
+                    returns = type("Path", nullable = true)
+                )
+                method(
+                    name = "segments",
+                    doc = "List of path segments.",
+                    returns = TypeGenericDoc(type("lyng.List"), listOf(type("lyng.String")))
+                )
                 method(
                     name = "exists",
-                    doc = "Whether the path exists on the filesystem.",
+                    doc = "Check whether this path exists on the filesystem.",
                     returns = type("lyng.Bool")
                 )
                 method(
                     name = "isFile",
-                    doc = "Whether the path exists and is a file.",
+                    doc = "True if this path is a regular file (based on cached metadata).",
                     returns = type("lyng.Bool")
                 )
                 method(
-                    name = "isDir",
-                    doc = "Whether the path exists and is a directory.",
+                    name = "isDirectory",
+                    doc = "True if this path is a directory (based on cached metadata).",
                     returns = type("lyng.Bool")
                 )
+                method(
+                    name = "size",
+                    doc = "File size in bytes, or null when unavailable.",
+                    returns = type("lyng.Int", nullable = true)
+                )
+                method(
+                    name = "createdAt",
+                    doc = "Creation time as `Instant`, or null when unavailable.",
+                    returns = type("lyng.Instant", nullable = true)
+                )
+                method(
+                    name = "createdAtMillis",
+                    doc = "Creation time in milliseconds since epoch, or null when unavailable.",
+                    returns = type("lyng.Int", nullable = true)
+                )
+                method(
+                    name = "modifiedAt",
+                    doc = "Last modification time as `Instant`, or null when unavailable.",
+                    returns = type("lyng.Instant", nullable = true)
+                )
+                method(
+                    name = "modifiedAtMillis",
+                    doc = "Last modification time in milliseconds since epoch, or null when unavailable.",
+                    returns = type("lyng.Int", nullable = true)
+                )
+                method(
+                    name = "list",
+                    doc = "List directory entries as `Path` objects.",
+                    returns = TypeGenericDoc(type("lyng.List"), listOf(type("Path")))
+                )
+                method(
+                    name = "readBytes",
+                    doc = "Read the entire file into a binary buffer.",
+                    returns = type("lyng.Buffer")
+                )
+                method(
+                    name = "writeBytes",
+                    doc = "Write a binary buffer to the file, replacing content.",
+                    params = listOf(ParamDoc("bytes", type("lyng.Buffer")))
+                )
+                method(
+                    name = "appendBytes",
+                    doc = "Append a binary buffer to the end of the file.",
+                    params = listOf(ParamDoc("bytes", type("lyng.Buffer")))
+                )
                 method(
                     name = "readUtf8",
-                    doc = "Read the entire file as UTF-8 string.",
+                    doc = "Read the entire file as a UTF-8 string.",
                     returns = type("lyng.String")
                 )
                 method(
                     name = "writeUtf8",
-                    doc = "Write UTF-8 string to the file (overwrite).",
+                    doc = "Write a UTF-8 string to the file, replacing content.",
                     params = listOf(ParamDoc("text", type("lyng.String")))
                 )
                 method(
-                    name = "bytes",
-                    doc = "Iterate file content as `Buffer` chunks.",
+                    name = "appendUtf8",
+                    doc = "Append UTF-8 text to the end of the file.",
+                    params = listOf(ParamDoc("text", type("lyng.String")))
+                )
+                method(
+                    name = "metadata",
+                    doc = "Fetch cached metadata as a map of fields: `isFile`, `isDirectory`, `size`, `createdAtMillis`, `modifiedAtMillis`, `isSymlink`.",
+                    returns = TypeGenericDoc(type("lyng.Map"), listOf(type("lyng.String"), type("lyng.Any")))
+                )
+                method(
+                    name = "mkdirs",
+                    doc = "Create directories (like `mkdir -p`). If `mustCreate` is true and the path already exists, the call fails.",
+                    params = listOf(ParamDoc("mustCreate", type("lyng.Bool")))
+                )
+                method(
+                    name = "move",
+                    doc = "Move this path to a new location. `to` may be a `Path` or `String`.",
+                    params = listOf(ParamDoc("to"), ParamDoc("overwrite", type("lyng.Bool")))
+                )
+                method(
+                    name = "delete",
+                    doc = "Delete this path. `recursively=true` removes directories with their contents.",
+                    params = listOf(ParamDoc("mustExist", type("lyng.Bool")), ParamDoc("recursively", type("lyng.Bool")))
+                )
+                method(
+                    name = "copy",
+                    doc = "Copy this path to a new location. `to` may be a `Path` or `String`.",
+                    params = listOf(ParamDoc("to"), ParamDoc("overwrite", type("lyng.Bool")))
+                )
+                method(
+                    name = "glob",
+                    doc = "List entries matching a glob pattern (no recursion).",
+                    params = listOf(ParamDoc("pattern", type("lyng.String"))),
+                    returns = TypeGenericDoc(type("lyng.List"), listOf(type("Path")))
+                )
+                method(
+                    name = "readChunks",
+                    doc = "Read file in fixed-size chunks as an iterator of `Buffer`.",
                     params = listOf(ParamDoc("size", type("lyng.Int"))),
                     returns = TypeGenericDoc(type("lyng.Iterator"), listOf(type("lyng.Buffer")))
                 )
                 method(
-                    name = "lines",
-                    doc = "Iterate file as lines of text.",
+                    name = "readUtf8Chunks",
+                    doc = "Read UTF-8 text in fixed-size chunks as an iterator of `String`.",
+                    params = listOf(ParamDoc("size", type("lyng.Int"))),
                     returns = TypeGenericDoc(type("lyng.Iterator"), listOf(type("lyng.String")))
                 )
+                method(
+                    name = "lines",
+                    doc = "Iterate lines of the file as `String` values.",
+                    returns = TypeGenericDoc(type("lyng.Iterator"), listOf(type("lyng.String")))
+                )
+            }
+
+            classDoc(
+                name = "BytesIterator",
+                doc = "Iterator over binary chunks."
+            ) {
+                method("iterator", "Return this iterator instance.", returns = type("BytesIterator"))
+                method("hasNext", "Whether there is another chunk available.", returns = type("lyng.Bool"))
+                method("next", "Return the next chunk as a `Buffer`.", returns = type("lyng.Buffer"))
+                method("cancelIteration", "Stop the iteration early.")
+            }
+
+            classDoc(
+                name = "StringChunksIterator",
+                doc = "Iterator over UTF-8 text chunks."
+            ) {
+                method("iterator", "Return this iterator instance.", returns = type("StringChunksIterator"))
+                method("hasNext", "Whether there is another chunk available.", returns = type("lyng.Bool"))
+                method("next", "Return the next UTF-8 chunk as a `String`.", returns = type("lyng.String"))
+                method("cancelIteration", "Stop the iteration early.")
+            }
+
+            classDoc(
+                name = "LinesIterator",
+                doc = "Iterator that yields lines of text."
+            ) {
+                method("iterator", "Return this iterator instance.", returns = type("LinesIterator"))
+                method("hasNext", "Whether another line is available.", returns = type("lyng.Bool"))
+                method("next", "Return the next line as `String`.", returns = type("lyng.String"))
+                method("cancelIteration", "Stop the iteration early.")
             }
 
             // Top-level exported constants

lyngio/src/commonMain/kotlin/net/sergeych/lyngio/docs/ProcessBuiltinDocs.kt

@@ -0,0 +1,117 @@
+/*
+ * Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package net.sergeych.lyngio.docs
+
+import net.sergeych.lyng.miniast.BuiltinDocRegistry
+import net.sergeych.lyng.miniast.ParamDoc
+import net.sergeych.lyng.miniast.type
+
+object ProcessBuiltinDocs {
+    private var registered = false
+
+    fun ensure() {
+        if (registered) return
+        BuiltinDocRegistry.module("lyng.io.process") {
+            classDoc(
+                name = "Process",
+                doc = "Process execution and control."
+            ) {
+                method(
+                    name = "execute",
+                    doc = "Execute a process with arguments.",
+                    params = listOf(ParamDoc("executable", type("lyng.String")), ParamDoc("args", type("lyng.List"))),
+                    returns = type("RunningProcess"),
+                    isStatic = true
+                )
+                method(
+                    name = "shell",
+                    doc = "Execute a command via system shell.",
+                    params = listOf(ParamDoc("command", type("lyng.String"))),
+                    returns = type("RunningProcess"),
+                    isStatic = true
+                )
+            }
+
+            classDoc(
+                name = "Platform",
+                doc = "Platform information."
+            ) {
+                method(
+                    name = "details",
+                    doc = "Get platform core details.",
+                    returns = type("lyng.Map"),
+                    isStatic = true
+                )
+                method(
+                    name = "isSupported",
+                    doc = "Check if processes are supported on this platform.",
+                    returns = type("lyng.Bool"),
+                    isStatic = true
+                )
+            }
+
+            classDoc(
+                name = "RunningProcess",
+                doc = "Handle to a running process."
+            ) {
+                method(
+                    name = "stdout",
+                    doc = "Get standard output stream as a Flow of lines.",
+                    returns = type("lyng.Flow")
+                )
+                method(
+                    name = "stderr",
+                    doc = "Get standard error stream as a Flow of lines.",
+                    returns = type("lyng.Flow")
+                )
+                method(
+                    name = "signal",
+                    doc = "Send a signal to the process (e.g. 'SIGINT', 'SIGTERM', 'SIGKILL').",
+                    params = listOf(ParamDoc("signal", type("lyng.String")))
+                )
+                method(
+                    name = "waitFor",
+                    doc = "Wait for the process to exit and return its exit code.",
+                    returns = type("lyng.Int")
+                )
+                method(
+                    name = "destroy",
+                    doc = "Forcefully terminate the process."
+                )
+            }
+
+            // Top-level exported constants
+            valDoc(
+                name = "Process",
+                doc = "Process execution and control.",
+                type = type("Process")
+            )
+            valDoc(
+                name = "Platform",
+                doc = "Platform information.",
+                type = type("Platform")
+            )
+            valDoc(
+                name = "RunningProcess",
+                doc = "Handle to a running process.",
+                type = type("RunningProcess")
+            )
+        }
+        registered = true
+    }
+}

lyngio/src/commonMain/kotlin/net/sergeych/lyngio/process/LyngProcess.kt

@@ -0,0 +1,93 @@
+/*
+ * Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package net.sergeych.lyngio.process
+
+import kotlinx.coroutines.flow.Flow
+import net.sergeych.lyngio.process.security.ProcessAccessOp
+import net.sergeych.lyngio.process.security.ProcessAccessPolicy
+
+/**
+ * Common signals for process control.
+ */
+enum class ProcessSignal {
+    SIGINT, SIGTERM, SIGKILL
+}
+
+/**
+ * Multiplatform process representation.
+ */
+interface LyngProcess {
+    /**
+     * Standard output stream as a flow of strings (lines).
+     */
+    val stdout: Flow<String>
+
+    /**
+     * Standard error stream as a flow of strings (lines).
+     */
+    val stderr: Flow<String>
+
+    /**
+     * Send a signal to the process.
+     * Throws exception if signals are not supported on the platform or for this process.
+     */
+    suspend fun sendSignal(signal: ProcessSignal)
+
+    /**
+     * Wait for the process to exit and return the exit code.
+     */
+    suspend fun waitFor(): Int
+
+    /**
+     * Forcefully terminate the process.
+     */
+    fun destroy()
+}
+
+/**
+ * Interface for running processes.
+ */
+interface LyngProcessRunner {
+    /**
+     * Execute a process with the given executable and arguments.
+     */
+    suspend fun execute(executable: String, args: List<String>): LyngProcess
+
+    /**
+     * Execute a command via the platform's default shell.
+     */
+    suspend fun shell(command: String): LyngProcess
+}
+
+/**
+ * Secured implementation of [LyngProcessRunner] that checks against a [ProcessAccessPolicy].
+ */
+class SecuredLyngProcessRunner(
+    private val runner: LyngProcessRunner,
+    private val policy: ProcessAccessPolicy
+) : LyngProcessRunner {
+    override suspend fun execute(executable: String, args: List<String>): LyngProcess {
+        policy.require(ProcessAccessOp.Execute(executable, args))
+        return runner.execute(executable, args)
+    }
+
+    override suspend fun shell(command: String): LyngProcess {
+        policy.require(ProcessAccessOp.Shell(command))
+        return runner.shell(command)
+    }
+}