more Buffer encodings

docs/Buffer.md

@@ -102,20 +102,46 @@ As with [List], it is possible to use ranges as indexes to slice a Buffer:
 
     >>> void
 
+## Encoding
+
+You can encode `String` to buffer using buffer constructor, as was shown. Also, buffer supports out of the box base64 (
+which is used in `toString`) and hex encoding:
+
+    import lyng.buffer
+    
+    // to UTF8 and back:
+    val b = Buffer("hello")
+    assertEquals( "hello", b.decodeUtf8() )
+    
+    // to base64 and back:
+    assertEquals( b, Buffer.decodeBase64(b.base64) )
+    assertEquals( b, Buffer.decodeHex(b.hex) )
+    >>> void
+
 ## Members
 
 | name                      | meaning                           | type          |
-|---------------|------------------------------------|---------------|
+|---------------------------|-----------------------------------|---------------|
 | `size`                    | size                              | Int           |
-| `decodeUtf8`  | decodee to String using UTF8 rules | Any           |
+| `decodeUtf8`              | decode to String using UTF8 rules | Any           |
 | `+`                       | buffer concatenation              | Any           |
 | `toMutable()`             | create a mutable copy             | MutableBuffer |
+| `hex`                     | encode to hex strign              | String        |
+| `Buffer.decodeHex(hexStr) | decode hex string                 | Buffer        |
+| `base64`                  | encode to base64 (url flavor) (2) | String        |
+| `Buffer.decodeBase64`     | decode base64 to new Buffer (2)   | Buffer        |
 
 (1)
 : optimized implementation that override `Iterable` one
 
+(2)
+: base64url alphabet is used without trailing '=', which allows string to be used in URI without escaping. Note that
+decoding supports both traditional and URL alphabets automatically, and ignores filling `=` characters. Base64URL is
+well known and mentioned in the internet, for example, [here](https://base64.guru/standards/base64url).
+
 Also, it inherits methods from [Iterable] and [Array].
 
 
 [Range]: Range.md
+
 [Iterable]: Iterable.md

lynglib/build.gradle.kts

@@ -21,7 +21,7 @@ import org.jetbrains.kotlin.gradle.ExperimentalWasmDsl
 import org.jetbrains.kotlin.gradle.dsl.JvmTarget
 
 group = "net.sergeych"
-version = "0.8.11-SNAPSHOT"
+version = "0.8.12-SNAPSHOT"
 
 buildscript {
     repositories {

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/Obj.kt

@@ -288,6 +288,9 @@ open class Obj {
             addFn("toString") {
                 thisObj.asStr
             }
+            addFn("inspect", true) {
+                thisObj.inspect().toObj()
+            }
             addFn("contains") {
                 ObjBool(thisObj.contains(this, args.firstAndOnly()))
             }

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjBuffer.kt

@@ -19,6 +19,7 @@ package net.sergeych.lyng.obj
 
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.toList
+import net.sergeych.bintools.decodeHex
 import net.sergeych.bintools.encodeToHex
 import net.sergeych.bintools.toDump
 import net.sergeych.lyng.Scope
@@ -26,12 +27,17 @@ import net.sergeych.lyng.statement
 import net.sergeych.lynon.LynonDecoder
 import net.sergeych.lynon.LynonEncoder
 import net.sergeych.lynon.LynonType
+import net.sergeych.mp_tools.decodeBase64Url
+import net.sergeych.mp_tools.encodeToBase64Url
 import kotlin.math.min
 
 open class ObjBuffer(val byteArray: UByteArray) : Obj() {
 
     override val objClass: ObjClass = type
 
+    val hex by lazy { byteArray.encodeToHex("")}
+    val base64 by lazy { byteArray.toByteArray().encodeToBase64Url()}
+
     fun checkIndex(scope: Scope, index: Obj): Int {
         if (index !is ObjInt)
             scope.raiseIllegalArgument("index must be Int")
@@ -83,9 +89,7 @@ open class ObjBuffer(val byteArray: UByteArray) : Obj() {
         } else scope.raiseIllegalArgument("can't concatenate buffer with ${other.inspect()}")
     }
 
-    override fun toString(): String {
-        return "Buffer(${byteArray.encodeToHex()})"
-    }
+    override fun toString(): String = base64
 
     override fun equals(other: Any?): Boolean {
         if (this === other) return true
@@ -102,6 +106,8 @@ open class ObjBuffer(val byteArray: UByteArray) : Obj() {
         encoder.encodeCachedBytes(byteArray.asByteArray())
     }
 
+    override fun inspect(): String = "Buf($base64)"
+
     companion object {
         private suspend fun createBufferFrom(scope: Scope, obj: Obj): ObjBuffer =
             when (obj) {
@@ -158,11 +164,27 @@ open class ObjBuffer(val byteArray: UByteArray) : Obj() {
                 })
 
         }.apply {
+            addClassFn("decodeBase64") {
+                ObjBuffer(requireOnlyArg<Obj>().toString().decodeBase64Url().asUByteArray())
+            }
+            addClassFn("decodeHex") {
+                ObjBuffer(requireOnlyArg<Obj>().toString().decodeHex().asUByteArray())
+            }
             createField("size",
                 statement {
                     (thisObj as ObjBuffer).byteArray.size.toObj()
                 }
             )
+            createField("hex",
+                statement {
+                    thisAs<ObjBuffer>().hex.toObj()
+                }
+            )
+            createField("base64",
+                statement {
+                    thisAs<ObjBuffer>().base64.toObj()
+                }
+            )
             addFn("decodeUtf8") {
                 ObjString(
                     thisAs<ObjBuffer>().byteArray.toByteArray().decodeToString()

lynglib/src/commonMain/kotlin/net/sergeych/lyng/stdlib_included/root_lyng.kt

@@ -95,10 +95,8 @@ fun Iterable.joinToString(prefix=" ", transformer=null) {
 
 fun Iterable.any(predicate): Bool {
     for( i in this ) {
-        if( predicate(i) ) {
+        if( predicate(i) )
             break true
-        // todo: add cancelIteration() in for loop!
-        }
     } else false
 }
 

lynglib/src/commonTest/kotlin/ScriptTest.kt

@@ -2630,6 +2630,26 @@ class ScriptTest {
         )
     }
 
+    @Test
+    fun testBufferEncodings() = runTest {
+        eval("""
+            import lyng.buffer
+            
+            val b = Buffer("hello")
+            println(b.toDump())
+            assertEquals( "hello", b.decodeUtf8() )
+            
+            println(b.base64)
+            println(b.hex)
+
+            assertEquals( b, Buffer.decodeBase64(b.base64) )
+            assertEquals( b, Buffer.decodeHex(b.hex) )
+            
+            println(b.inspect())
+                        
+        """.trimIndent())
+    }
+
     @Test
     fun testBufferCompare() = runTest {
         eval(