lyng/docs/ai_stdlib_reference.md

Lyng Stdlib Reference for AI Agents (Compact)

Purpose: fast overview of what is available by default and what must be imported.

Sources: lynglib/src/commonMain/kotlin/net/sergeych/lyng/Script.kt, lynglib/stdlib/lyng/root.lyng, lynglib/src/commonMain/kotlin/net/sergeych/lyng/stdlib_included/observable_lyng.kt.

1. Default Availability

• Normal scripts are auto-seeded with lyng.stdlib (default import manager path).
• Root runtime scope also exposes global constants/functions directly.

2. Core Global Functions (Root Scope)

• IO/debug: print, println, traceScope.
• Invocation/util: call, run, dynamic, cached, lazy.
• Assertions/tests: assert, assertEquals/assertEqual, assertNotEquals, assertThrows.
• Preconditions: require, check.
• Async/concurrency: launch, yield, flow, delay.
  • Deferred.cancel() cancels an active task.
  • Deferred.await() throws CancellationException if that task was cancelled.
• Math: floor, ceil, round, sin, cos, tan, asin, acos, atan, sinh, cosh, tanh, asinh, acosh, atanh, exp, ln, log10, log2, pow, sqrt, abs, clamp.
  • These helpers also accept lyng.decimal.Decimal.
  • Exact Decimal path today: abs, floor, ceil, round, and pow with integral exponent.
  • Temporary Decimal path for the rest: convert Decimal -> Real, compute, then convert back to Decimal.
  • Treat that bridge as temporary; prefer native Decimal implementations when they become available.

3. Core Global Constants/Types

• Values: Unset, π.
• Primitive/class symbols: Object, Int, Real, Bool, Char, String, Class, Callable.
• Collections/types: Iterable, Iterator, Collection, Array, List, ImmutableList, Set, ImmutableSet, Map, ImmutableMap, MapEntry, Range, RingBuffer.
• Random: singleton Random and class SeededRandom.
• Async types: Deferred, CompletableDeferred, Mutex, Flow, FlowBuilder.
• Async exception: CancellationException.
• Delegation types: Delegate, DelegateContext.
• Regex types: Regex, RegexMatch.
• Also present: Math.PI namespace constant.

4. lyng.stdlib Module Surface (from root.lyng)

4.1 Extern class declarations

• Exceptions/delegation base: Exception, CancellationException, IllegalArgumentException, NotImplementedException, Delegate.
• Collections and iterables: Iterable<T>, Iterator<T>, Collection<T>, Array<T>, List<T>, ImmutableList<T>, Set<T>, ImmutableSet<T>, Map<K,V>, ImmutableMap<K,V>, MapEntry<K,V>, RingBuffer<T>.
• Host iterator bridge: KotlinIterator<T>.
• Random APIs: extern object Random, extern class SeededRandom.

4.2 High-use extension APIs

• Iteration/filtering: forEach, filter, filterFlow, filterNotNull, filterFlowNotNull, drop, dropLast, takeLast.
• Search/predicates: findFirst, findFirstOrNull, any, all, count, first, last.
• Mapping/aggregation: map, flatMap, flatten, sum, sumOf, minOf, maxOf.
• Ordering and list building: sorted, sortedBy, shuffled, List.sort, List.sortBy, List.fill.
  • List.fill(size) { index -> ... } constructs a new List<T> by evaluating the block once per index from 0 to size - 1.
• String helper: joinToString, String.re.

4.3 Delegation helpers

• enum DelegateAccess { Val, Var, Callable }
• interface Delegate<T,ThisRefType=void> with getValue, setValue, invoke, bind.
• class lazy<T,...> delegate implementation.
• fun with(self, block) helper.

4.4 Other module-level symbols

• $~ (last regex match object).
• TODO(message?) utility.
• StackTraceEntry class.
• Random.nextInt(), Random.nextFloat(), Random.next(range), Random.seeded(seed).
• SeededRandom.nextInt(), SeededRandom.nextFloat(), SeededRandom.next(range).

5. Additional Built-in Modules (import explicitly)

• import lyng.observable
  • Observable, Subscription, ObservableList, ListChange and change subtypes, ChangeRejectionException.
• import lyng.decimal
  • Decimal, DecimalContext, DecimalRounding, withDecimalContext(...).
  • Kotlin host helper: ScopeFacade.newDecimal(BigDecimal) wraps an ionspin host decimal as a Lyng Decimal.
• import lyng.complex
  • Complex, complex(re, im), cis(angle), and numeric embedding extensions such as 2.i / 3.re.
• import lyng.matrix
  • Matrix, Vector, matrix(rows), vector(values), dense linear algebra, inversion, solving, and matrix slicing with m[row, col].
• import lyng.buffer
  • Buffer, MutableBuffer.
• import lyng.legacy_digest
  • LegacyDigest.sha1(data): String — SHA-1 hex digest; data may be String (UTF-8) or Buffer (raw bytes).
  • ⚠️ Cryptographically broken. Use only for legacy protocol / file-format compatibility.
• import lyng.serialization
  • Lynon serialization utilities.
• import lyng.time
  • Instant, DateTime, Duration, and module delay.

6. Optional (lyngio) Modules

Requires installing lyngio into the import manager from host code.

• import lyng.io.fs (filesystem Path API)
• import lyng.io.process (process execution API)
• import lyng.io.console (console capabilities, geometry, ANSI/output, events)
• import lyng.io.http (HTTP/HTTPS client API)
• import lyng.io.ws (WebSocket client API; currently supported on JVM, capability-gated elsewhere)
• import lyng.io.net (TCP/UDP transport API; currently supported on JVM, capability-gated elsewhere)

7. AI Generation Tips

• Assume lyng.stdlib APIs exist in regular script contexts.
• For platform-sensitive code (fs, process, console, http, ws, net), gate assumptions and mention required module install.
• Prefer extension-method style (items.filter { ... }) and standard scope helpers (let/also/apply/run).