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refs #35 started user class serialization; started MP compression

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Sergey Chernov 2025-07-12 22:14:11 +03:00
parent 77f9191387
commit 23dafff453
10 changed files with 2426 additions and 25 deletions
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1
lynglib/src/commonMain/kotlin/net/sergeych/lyng/Compiler.kt
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@ -1112,6 +1112,7 @@ class Compiler(
// inheritance must alter this code:
val newClass = ObjClass(className).apply {
instanceConstructor = constructorCode
constructorMeta = constructorArgsDeclaration
}
return statement {

1
lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjClass.kt
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@ -10,6 +10,7 @@ open class ObjClass(
vararg parents: ObjClass,
) : Obj() {
var constructorMeta: ArgsDeclaration? = null
var instanceConstructor: Statement? = null
val allParentsSet: Set<ObjClass> =

13
lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjInstance.kt
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@ -2,6 +2,7 @@ package net.sergeych.lyng.obj
import net.sergeych.lyng.Arguments
import net.sergeych.lyng.Scope
import net.sergeych.lynon.LynonEncoder
class ObjInstance(override val objClass: ObjClass) : Obj() {
@ -44,6 +45,18 @@ class ObjInstance(override val objClass: ObjClass) : Obj() {
return "${objClass.className}($fields)"
}
override suspend fun serialize(scope: Scope, encoder: LynonEncoder) {
val meta = objClass.constructorMeta
?: scope.raiseError("can't serialize non-serializable object (no constructor meta)")
for( p in meta.params) {
val r = readField(scope, p.name)
println("serialize ${p.name}=${r.value}")
TODO()
// encoder.encodeObj(scope, r.value)
}
// todo: possible vars?
}
override suspend fun compareTo(scope: Scope, other: Obj): Int {
if (other !is ObjInstance) return -1
if (other.objClass != objClass) return -1

5
lynglib/src/commonMain/kotlin/net/sergeych/lynon/LynonDecoder.kt
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@ -4,16 +4,15 @@ import net.sergeych.lyng.Scope
import net.sergeych.lyng.obj.Obj
import net.sergeych.lyng.obj.ObjClass
open class LynonDecoder(val bin: BitInput) {
open class LynonDecoder(val bin: BitInput,val settings: LynonSettings = LynonSettings.default) {
val cache = mutableListOf<Obj>()
inline fun decodeCached(f: LynonDecoder.() -> Obj): Obj {
return if( bin.getBit() == 0 ) {
// unpack and cache
val cached = bin.getBool()
f().also {
if( cached ) cache.add(it)
if( settings.shouldCache(it) ) cache.add(it)
}
}
else {

25
lynglib/src/commonMain/kotlin/net/sergeych/lynon/LynonEncoder.kt
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@ -2,28 +2,12 @@ package net.sergeych.lynon
import net.sergeych.lyng.Scope
import net.sergeych.lyng.obj.Obj
import net.sergeych.lyng.obj.ObjBool
import net.sergeych.lyng.obj.ObjChar
import net.sergeych.lyng.obj.ObjInt
class LynonPacker(bout: MemoryBitOutput = MemoryBitOutput()) : LynonEncoder(bout) {
fun toUByteArray(): UByteArray = (bout as MemoryBitOutput).toUByteArray()
}
class LynonUnpacker(source: UByteArray) : LynonDecoder(MemoryBitInput(source))
open class LynonEncoder(val bout: BitOutput) {
fun shouldCache(obj: Obj): Boolean = when (obj) {
is ObjChar -> false
is ObjInt -> obj.value > 0x10000FF
is ObjBool -> false
else -> true
}
open class LynonEncoder(val bout: BitOutput,val settings: LynonSettings = LynonSettings.default) {
val cache = mutableMapOf<Any, Int>()
inline fun encodeCached(item: Any, packer: LynonEncoder.() -> Unit) {
private inline fun encodeCached(item: Any, packer: LynonEncoder.() -> Unit) {
if (item is Obj) {
cache[item]?.let { cacheId ->
val size = sizeInBits(cache.size)
@ -31,11 +15,8 @@ open class LynonEncoder(val bout: BitOutput) {
bout.putBits(cacheId.toULong(), size)
} ?: run {
bout.putBit(0)
if (shouldCache(item)) {
bout.putBit(1)
if (settings.shouldCache(item))
cache[item] = cache.size
} else
bout.putBit(0)
packer()
}
}

20
lynglib/src/commonMain/kotlin/net/sergeych/lynon/LynonSettings.kt Normal file
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@ -0,0 +1,20 @@
package net.sergeych.lynon
import net.sergeych.lyng.obj.Obj
import net.sergeych.lyng.obj.ObjBool
import net.sergeych.lyng.obj.ObjChar
import net.sergeych.lyng.obj.ObjInt
open class LynonSettings() {
open fun shouldCache(obj: Obj): Boolean = when (obj) {
is ObjChar -> false
is ObjInt -> obj.value > 0x10000FF
is ObjBool -> false
else -> true
}
companion object {
val default = LynonSettings()
}
}

96
lynglib/src/commonMain/kotlin/net/sergeych/lynon/lzw0.kt Normal file
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@ -0,0 +1,96 @@
package net.sergeych.lynon
import net.sergeych.bintools.ByteChunk
import kotlin.math.roundToInt
/**
* LZW compression algorithm: work in progress.
*
* Uses Lyng but input/output. Uses automatic code size.
*
* TODO: - reset dictionary
*/
class LZW {
companion object {
val MAX_CODE_SIZE = 12
val STOP_CODE = (1 shl MAX_CODE_SIZE) - 1
val MAX_DICT_SIZE = (STOP_CODE * 0.92).roundToInt()
/**
* Compresses the input string using LZW algorithm
* @param input The string to compress
* @return List of compressed codes
*/
fun compress(input: UByteArray,bitOutput: BitOutput) {
// Initialize dictionary with all possible single characters
val dictionary = mutableMapOf<ByteChunk, Int>()
for (i in 0..255) {
// 23
dictionary[ByteChunk(ubyteArrayOf(i.toUByte()))] = i
}
var nextCode = 256
var current = ByteChunk(ubyteArrayOf())
// val result = mutableListOf<Int>()
for (char in input) {
val combined = current + char
if (dictionary.containsKey(combined)) {
current = combined
} else {
val size = sizeInBits(dictionary.size)
bitOutput.putBits(dictionary[current]!!,size)
dictionary[combined] = nextCode++
current = ByteChunk(ubyteArrayOf(char))
}
}
if (current.size > 0) {
val size = sizeInBits(dictionary.size)
bitOutput.putBits(dictionary[current]!!,size)
}
}
/**
* Decompresses a list of LZW codes back to the original string
* @param compressed The list of compressed codes
* @return The decompressed string
*/
fun decompress(compressed: BitInput): UByteArray {
// Initialize dictionary with all possible single characters
val dictionary = mutableMapOf<Int, UByteArray>()
for (i in 0..255) {
dictionary[i] = ubyteArrayOf(i.toUByte())
}
var nextCode = 256
var previous = dictionary[compressed.getBits(9).toInt()]!!
val result = mutableListOf<UByte>()
while( !compressed.isEndOfStream ) {
val codeSize = sizeInBits(nextCode + 1)
val code = compressed.getBitsOrNull(codeSize)?.toInt() ?: break
val current = if ( code in dictionary) {
dictionary[code]!!
} else if (code == nextCode) {
// Special case for pattern like cScSc
previous + previous[0]
} else {
throw IllegalArgumentException("Invalid compressed code: $code")
}
result += current
dictionary[nextCode++] = previous + current[0]
previous = current
}
return result.toTypedArray().toUByteArray()
}
}
}
private operator fun ByteChunk.plus(byte: UByte): ByteChunk {
return ByteChunk(data + byte)
}

14
lynglib/src/commonMain/kotlin/net/sergeych/lynon/tools.kt Normal file
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@ -0,0 +1,14 @@
package net.sergeych.lynon
/**
* Variant of [LynonEncoder] that writes to embedded [MemoryBitOutput]
*/
class LynonPacker(bout: MemoryBitOutput = MemoryBitOutput(), settings: LynonSettings = LynonSettings.default)
: LynonEncoder(bout, settings) {
fun toUByteArray(): UByteArray = (bout as MemoryBitOutput).toUByteArray()
}
/**
* Variant of [LynonDecoder] that reads from a given `source` using [MemoryBitInput]
*/
class LynonUnpacker(source: UByteArray) : LynonDecoder(MemoryBitInput(source))

25
lynglib/src/jvmTest/kotlin/LynonTests.kt
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@ -3,6 +3,8 @@ import kotlinx.coroutines.test.runTest
import net.sergeych.lyng.Scope
import net.sergeych.lyng.obj.*
import net.sergeych.lynon.*
import java.nio.file.Files
import java.nio.file.Path
import kotlin.test.Test
class LynonTests {
@ -189,4 +191,27 @@ class LynonTests {
assertEquals(ObjInt(Long.MAX_VALUE), decoder.unpackObject(scope, ObjInt.type))
assertEquals(ObjInt(Long.MAX_VALUE), decoder.unpackObject(scope, ObjInt.type))
}
@Test
fun testLzw() {
// Example usage
// val original = "TOBEORNOTTOBEORTOBEORNOT"
val original = Files.readString(Path.of("../sample_texts/dikkens_hard_times.txt"))
// println("Original: $original")
println("Length: ${original.length}")
// Compress
val out = MemoryBitOutput()
LZW.compress(original.encodeToByteArray().toUByteArray(), out)
// println("\nCompressed codes: ${out.toUByteArray().toDump()}")
println("Number of codes: ${out.toUByteArray().size}")
// // Decompress
val decompressed = LZW.decompress(MemoryBitInput(out.toUByteArray())).toByteArray().decodeToString()
// println("\nDecompressed: $decompressed")
println("Length: ${decompressed.length}")
// Verification
println("\nOriginal and decompressed match: ${original == decompressed}")
}
}

2251
sample_texts/dikkens_hard_times.txt Normal file
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