[WASM] Regex std implementation

compiler/tests/org/jetbrains/kotlin/code/CodeConformanceTest.kt

@@ -113,9 +113,8 @@ class CodeConformanceTest : TestCase() {
                 "libraries/tools/kotlin-test-nodejs-runner/.gradle",
                 "libraries/tools/kotlin-test-nodejs-runner/node_modules",
                 "libraries/tools/kotlin-source-map-loader/.gradle",
-                "kotlin-native", // Have a separate licences manager
+                "kotlin-native", "libraries/stdlib/native-wasm", // Have a separate licences manager
                 "out",
-                "kotlin-native/runtime"
             )
         )
     }

kotlin-native/backend.native/tests/build.gradle

@@ -5632,7 +5632,7 @@ KotlinNativeTestKt.createTest(project, 'harmonyRegexTest', KonanGTest) { task ->
     task.useFilter = false
     task.testLogger = KonanTest.Logger.GTEST
 
-    def sources = UtilsKt.getFilesToCompile(project, ["harmony_regex"], [])
+    def sources = UtilsKt.getFilesToCompile(project, ["../../../libraries/stdlib/native-wasm/test/harmony_regex"], [])
 
     konanArtifacts {
         program('harmonyRegexTest', targets: [target.name]) {

kotlin-native/runtime/src/main/cpp/Regex.cpp

@@ -542,7 +542,7 @@ constexpr Decomposition decompositionValues[] = {
 
 KInt getCanonicalClass(KInt ch) {
   int index = binarySearchRange(canonicalClassesKeys, ARRAY_SIZE(canonicalClassesKeys), ch);
-  if (canonicalClassesKeys[index] != ch) {
+  if (index == -1 || canonicalClassesKeys[index] != ch) {
     return 0;
   }
   return canonicalClassesValues[index];
@@ -550,7 +550,7 @@ KInt getCanonicalClass(KInt ch) {
 
 const Decomposition* getDecomposition(KInt codePoint) {
   int index = binarySearchRange(decompositionKeys, ARRAY_SIZE(decompositionKeys), codePoint);
-  if (decompositionKeys[index] != codePoint) {
+  if (index == -1 || decompositionKeys[index] != codePoint) {
     return nullptr;
   }
   return &decompositionValues[index];
@@ -566,7 +566,7 @@ KInt Kotlin_text_regex_getCanonicalClassInternal(KInt ch) {
 
 KBoolean Kotlin_text_regex_hasSingleCodepointDecompositionInternal(KInt ch) {
   int index = binarySearchRange(singleDecompositions, ARRAY_SIZE(singleDecompositions), ch);
-  return singleDecompositions[index] == ch;
+  return index != -1 && singleDecompositions[index] == ch;
 }
 
 OBJ_GETTER(Kotlin_text_regex_getDecompositionInternal, KInt ch) {

kotlin-native/runtime/src/main/kotlin/kotlin/text/CharNative.kt

@@ -0,0 +1,59 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package kotlin.text
+
+import kotlin.native.internal.GCUnsafeCall
+
+/**
+ * Returns `true` if this character is a Unicode high-surrogate code unit (also known as leading-surrogate code unit).
+ */
+@GCUnsafeCall("Kotlin_Char_isHighSurrogate")
+external public actual fun Char.isHighSurrogate(): Boolean
+
+/**
+ * Returns `true` if this character is a Unicode low-surrogate code unit (also known as trailing-surrogate code unit).
+ */
+@GCUnsafeCall("Kotlin_Char_isLowSurrogate")
+external public actual fun Char.isLowSurrogate(): Boolean
+
+/**
+ * Returns `true` if this character (Unicode code point) should be regarded as an ignorable
+ * character in a Java identifier or a Unicode identifier.
+ */
+@GCUnsafeCall("Kotlin_Char_isIdentifierIgnorable")
+external public fun Char.isIdentifierIgnorable(): Boolean
+
+/**
+ * Returns `true` if this character is an ISO control character.
+ *
+ * A character is considered to be an ISO control character if its [category] is [CharCategory.CONTROL],
+ * meaning the Char is in the range `'\u0000'..'\u001F'` or in the range `'\u007F'..'\u009F'`.
+ *
+ * @sample samples.text.Chars.isISOControl
+ */
+@GCUnsafeCall("Kotlin_Char_isISOControl")
+external public actual fun Char.isISOControl(): Boolean
+
+@SharedImmutable
+private val digits = intArrayOf(
+        0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
+        -1, -1, -1, -1, -1, -1, -1,
+        10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
+        20, 21, 22, 23, 24, 25, 26, 27, 28, 29,
+        30, 31, 32, 33, 34, 35,
+        -1, -1, -1, -1, -1, -1,
+        10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
+        20, 21, 22, 23, 24, 25, 26, 27, 28, 29,
+        30, 31, 32, 33, 34, 35
+)
+
+internal actual fun digitOf(char: Char, radix: Int): Int = when {
+    char >= '0' && char <= 'z' -> digits[char - '0']
+    char < '\u0080' -> -1
+    char >= '\uFF21' && char <= '\uFF3A' -> char - '\uFF21' + 10 // full-width latin capital letter
+    char >= '\uFF41' && char <= '\uFF5A' -> char - '\uFF41' + 10 // full-width latin small letter
+    else -> char.digitToIntImpl()
+}.let { if (it >= radix) -1 else it }

kotlin-native/runtime/src/main/kotlin/kotlin/text/regex/DecompositionHelpers.kt

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package kotlin.text.regex
+
+import kotlin.native.internal.GCUnsafeCall
+
+// Access to the decomposition tables. =========================================================================
+/** Gets canonical class for given codepoint from decomposition mappings table. */
+@GCUnsafeCall("Kotlin_text_regex_getCanonicalClassInternal")
+external internal fun getCanonicalClassInternal(ch: Int): Int
+
+/** Check if the given character is in table of single decompositions. */
+@GCUnsafeCall("Kotlin_text_regex_hasSingleCodepointDecompositionInternal")
+external internal fun hasSingleCodepointDecompositionInternal(ch: Int): Boolean
+
+/** Returns a decomposition for a given codepoint. */
+@GCUnsafeCall("Kotlin_text_regex_getDecompositionInternal")
+external internal fun getDecompositionInternal(ch: Int): IntArray?
+
+/**
+ * Decomposes the given string represented as an array of codepoints. Saves the decomposition into [outputCodepoints] array.
+ * Returns the length of the decomposition.
+ */
+@GCUnsafeCall("Kotlin_text_regex_decomposeString")
+external internal fun decomposeString(inputCodePoints: IntArray, inputLength: Int, outputCodePoints: IntArray): Int
+
+/**
+ * Decomposes the given codepoint. Saves the decomposition into [outputCodepoints] array starting with [fromIndex].
+ * Returns the length of the decomposition.
+ */
+@GCUnsafeCall("Kotlin_text_regex_decomposeCodePoint")
+external internal fun decomposeCodePoint(codePoint: Int, outputCodePoints: IntArray, fromIndex: Int): Int
+// =============================================================================================================

libraries/stdlib/native-wasm/src/kotlin/text/Char.kt

@@ -6,7 +6,6 @@
 package kotlin.text
 
 import kotlin.IllegalArgumentException
-import kotlin.native.internal.GCUnsafeCall
 
 /**
  * Returns `true` if this character (Unicode code point) is defined in Unicode.
@@ -74,24 +73,6 @@ public actual fun Char.isDigit(): Boolean {
     return isDigitImpl()
 }
 
-/**
- * Returns `true` if this character (Unicode code point) should be regarded as an ignorable
- * character in a Java identifier or a Unicode identifier.
- */
-@GCUnsafeCall("Kotlin_Char_isIdentifierIgnorable")
-external public fun Char.isIdentifierIgnorable(): Boolean
-
-/**
- * Returns `true` if this character is an ISO control character.
- *
- * A character is considered to be an ISO control character if its [category] is [CharCategory.CONTROL],
- * meaning the Char is in the range `'\u0000'..'\u001F'` or in the range `'\u007F'..'\u009F'`.
- *
- * @sample samples.text.Chars.isISOControl
- */
-@GCUnsafeCall("Kotlin_Char_isISOControl")
-external public actual fun Char.isISOControl(): Boolean
-
 /**
  * Determines whether a character is whitespace according to the Unicode standard.
  * Returns `true` if the character is whitespace.
@@ -231,39 +212,6 @@ public actual fun Char.lowercase(): String = lowercaseImpl()
 @SinceKotlin("1.5")
 public actual fun Char.titlecaseChar(): Char = titlecaseCharImpl()
 
-/**
- * Returns `true` if this character is a Unicode high-surrogate code unit (also known as leading-surrogate code unit).
- */
-@GCUnsafeCall("Kotlin_Char_isHighSurrogate")
-external public actual fun Char.isHighSurrogate(): Boolean
-
-/**
- * Returns `true` if this character is a Unicode low-surrogate code unit (also known as trailing-surrogate code unit).
- */
-@GCUnsafeCall("Kotlin_Char_isLowSurrogate")
-external public actual fun Char.isLowSurrogate(): Boolean
-
-@SharedImmutable
-private val digits = intArrayOf(
-    0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
-    -1, -1, -1, -1, -1, -1, -1,
-    10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
-    20, 21, 22, 23, 24, 25, 26, 27, 28, 29,
-    30, 31, 32, 33, 34, 35,
-    -1, -1, -1, -1, -1, -1,
-    10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
-    20, 21, 22, 23, 24, 25, 26, 27, 28, 29,
-    30, 31, 32, 33, 34, 35
-)
-
-internal actual fun digitOf(char: Char, radix: Int): Int = when {
-    char >= '0' && char <= 'z' -> digits[char - '0']
-    char < '\u0080' -> -1
-    char >= '\uFF21' && char <= '\uFF3A' -> char - '\uFF21' + 10 // full-width latin capital letter
-    char >= '\uFF41' && char <= '\uFF5A' -> char - '\uFF41' + 10 // full-width latin small letter
-    else -> char.digitToIntImpl()
-}.let { if (it >= radix) -1 else it }
-
 /**
  * Returns the Unicode general category of this character.
  */
@@ -331,4 +279,4 @@ public fun Char.Companion.toChars(codePoint: Int): CharArray =
             charArrayOf(high.toChar(), low.toChar())
         }
         else -> throw IllegalArgumentException()
-    }
+    }

libraries/stdlib/native-wasm/src/kotlin/text/regex/AbstractCharClass.kt

@@ -26,6 +26,7 @@ package kotlin.text.regex
 import kotlin.collections.associate
 import kotlin.native.concurrent.AtomicReference
 import kotlin.native.concurrent.freeze
+import kotlin.native.BitSet
 
 /**
  * Unicode category (i.e. Ll, Lu).

libraries/stdlib/native-wasm/src/kotlin/text/regex/CharClass.kt

@@ -22,6 +22,8 @@
 @file:Suppress("DEPRECATION") // Char.toInt()
 package kotlin.text.regex
 
+import kotlin.native.BitSet
+
 /**
  * User defined character classes (e.g. [abef]).
  */

libraries/stdlib/native-wasm/src/kotlin/text/regex/Lexer.kt

@@ -24,29 +24,6 @@
 @file:Suppress("DEPRECATION") // Char.toInt()
 package kotlin.text.regex
 
-import kotlin.native.internal.GCUnsafeCall
-
-// Access to the decomposition tables. =========================================================================
-/** Gets canonical class for given codepoint from decomposition mappings table. */
-@GCUnsafeCall("Kotlin_text_regex_getCanonicalClassInternal")
-external private fun getCanonicalClassInternal(ch: Int): Int
-
-/** Check if the given character is in table of single decompositions. */
-@GCUnsafeCall("Kotlin_text_regex_hasSingleCodepointDecompositionInternal")
-external private fun hasSingleCodepointDecompositionInternal(ch: Int): Boolean
-
-/** Returns a decomposition for a given codepoint. */
-@GCUnsafeCall("Kotlin_text_regex_getDecompositionInternal")
-external private fun getDecompositionInternal(ch: Int): IntArray?
-
-/**
- * Decomposes the given string represented as an array of codepoints. Saves the decomposition into [outputCodepoints] array.
- * Returns the length of the decomposition.
- */
-@GCUnsafeCall("Kotlin_text_regex_decomposeString")
-external private fun decomposeString(inputCodePoints: IntArray, inputLength: Int, outputCodePoints: IntArray): Int
-// =============================================================================================================
-
 /**
  * This is base class for special tokens like character classes and quantifiers.
  */

libraries/stdlib/native-wasm/src/kotlin/text/regex/sets/DecomposedCharSet.kt

@@ -22,15 +22,6 @@
 
 package kotlin.text.regex
 
-import kotlin.native.internal.GCUnsafeCall
-
-/**
- * Decomposes the given codepoint. Saves the decomposition into [outputCodepoints] array starting with [fromIndex].
- * Returns the length of the decomposition.
- */
-@GCUnsafeCall("Kotlin_text_regex_decomposeCodePoint")
-external private fun decomposeCodePoint(codePoint: Int, outputCodePoints: IntArray, fromIndex: Int): Int
-
 /** Represents canonical decomposition of Unicode character. Is used when CANON_EQ flag of Pattern class is specified. */
 open internal class DecomposedCharSet(
         /** Decomposition of the Unicode codepoint */

libraries/stdlib/wasm/build.gradle.kts

@@ -82,7 +82,7 @@ kotlin {
     sourceSets {
         val wasmMain by getting {
             kotlin.srcDirs("builtins", "internal", "runtime", "src", "stubs")
-            kotlin.srcDirs("../native-wasm/")
+            kotlin.srcDirs("$rootDir/libraries/stdlib/native-wasm/src")
             kotlin.srcDirs(files(builtInsSources.map { it.destinationDir }))
         }
 
@@ -102,6 +102,7 @@ kotlin {
                 api(project(":kotlin-test:kotlin-test-wasm"))
             }
             kotlin.srcDir("$rootDir/libraries/stdlib/wasm/test/")
+            kotlin.srcDir("$rootDir/libraries/stdlib/native-wasm/test/")
         }
     }
 }

libraries/stdlib/wasm/builtins/kotlin/Char.kt

@@ -144,17 +144,27 @@ public class Char private constructor(public val value: Char) : Comparable<Char>
         /**
          * The minimum value of a supplementary code point, `\u0x10000`.
          */
-        public const val MIN_SUPPLEMENTARY_CODE_POINT: Int = 0x10000
+        internal const val MIN_SUPPLEMENTARY_CODE_POINT: Int = 0x10000
+
+        /**
+         * The minimum value of a Unicode code point.
+         */
+        internal const val MIN_CODE_POINT = 0x000000
+
+        /**
+         * The maximum value of a Unicode code point.
+         */
+        internal const val MAX_CODE_POINT = 0X10FFFF
 
         /**
          * The minimum radix available for conversion to and from strings.
          */
-        public const val MIN_RADIX: Int = 2
+        internal const val MIN_RADIX: Int = 2
 
         /**
          * The maximum radix available for conversion to and from strings.
          */
-        public const val MAX_RADIX: Int = 36
+        internal const val MAX_RADIX: Int = 36
 
         /**
          * The number of bytes used to represent a Char in a binary form.

libraries/stdlib/wasm/src/kotlin/Text.kt

@@ -1,972 +0,0 @@
-/*
- * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
- * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
- */
-
-package kotlin.text
-
-import kotlin.math.abs
-
-actual class Regex {
-    actual constructor(pattern: String) { TODO("Wasm stdlib: Text") }
-    actual constructor(pattern: String, option: RegexOption) { TODO("Wasm stdlib: Text") }
-    actual constructor(pattern: String, options: Set<RegexOption>) { TODO("Wasm stdlib: Text") }
-
-    actual val pattern: String = TODO("Wasm stdlib: Text")
-    actual val options: Set<RegexOption> = TODO("Wasm stdlib: Text")
-
-    actual fun matchEntire(input: CharSequence): MatchResult? = TODO("Wasm stdlib: Text")
-    actual infix fun matches(input: CharSequence): Boolean = TODO("Wasm stdlib: Text")
-    actual fun containsMatchIn(input: CharSequence): Boolean = TODO("Wasm stdlib: Text")
-    actual fun replace(input: CharSequence, replacement: String): String = TODO("Wasm stdlib: Text")
-    actual fun replace(input: CharSequence, transform: (MatchResult) -> CharSequence): String = TODO("Wasm stdlib: Text")
-    actual fun replaceFirst(input: CharSequence, replacement: String): String = TODO("Wasm stdlib: Text")
-
-    actual fun matchAt(input: CharSequence, index: Int): MatchResult? = TODO("Wasm stdlib: Text")
-    actual fun matchesAt(input: CharSequence, index: Int): Boolean = TODO("Wasm stdlib: Text")
-
-    /**
-     * Returns the first match of a regular expression in the [input], beginning at the specified [startIndex].
-     *
-     * @param startIndex An index to start search with, by default 0. Must be not less than zero and not greater than `input.length()`
-     * @return An instance of [MatchResult] if match was found or `null` otherwise.
-     * @sample samples.text.Regexps.find
-     */
-    actual fun find(input: CharSequence, startIndex: Int): MatchResult? = TODO("Wasm stdlib: Text")
-
-    /**
-     * Returns a sequence of all occurrences of a regular expression within the [input] string, beginning at the specified [startIndex].
-     *
-     * @sample samples.text.Regexps.findAll
-     */
-    actual fun findAll(input: CharSequence, startIndex: Int): Sequence<MatchResult> = TODO("Wasm stdlib: Text")
-
-    /**
-     * Splits the [input] CharSequence to a list of strings around matches of this regular expression.
-     *
-     * @param limit Non-negative value specifying the maximum number of substrings the string can be split to.
-     * Zero by default means no limit is set.
-     */
-    actual fun split(input: CharSequence, limit: Int): List<String> = TODO("Wasm stdlib: Text")
-
-    /**
-     * Splits the [input] CharSequence to a sequence of strings around matches of this regular expression.
-     *
-     * @param limit Non-negative value specifying the maximum number of substrings the string can be split to.
-     * Zero by default means no limit is set.
-     * @sample samples.text.Regexps.splitToSequence
-     */
-    public actual fun splitToSequence(input: CharSequence, limit: Int): Sequence<String> = TODO("Wasm stdlib: Text")
-
-    actual companion object {
-        actual fun fromLiteral(literal: String): Regex = TODO("Wasm stdlib: Text")
-        actual fun escape(literal: String): String = TODO("Wasm stdlib: Text")
-        actual fun escapeReplacement(literal: String): String = TODO("Wasm stdlib: Text")
-    }
-}
-
-actual class MatchGroup {
-    actual val value: String = TODO("Wasm stdlib: Text")
-}
-
-actual enum class RegexOption {
-    IGNORE_CASE,
-    MULTILINE
-}
-
-
-// From char.kt
-
-/**
- * Returns `true` if this character is a Unicode high-surrogate code unit (also known as leading-surrogate code unit).
- */
-public actual fun Char.isHighSurrogate(): Boolean = this in Char.MIN_HIGH_SURROGATE..Char.MAX_HIGH_SURROGATE
-
-/**
- * Returns `true` if this character is a Unicode low-surrogate code unit (also known as trailing-surrogate code unit).
- */
-public actual fun Char.isLowSurrogate(): Boolean = this in Char.MIN_LOW_SURROGATE..Char.MAX_LOW_SURROGATE
-
-/**
- * Converts this character to lower case using Unicode mapping rules of the invariant locale.
- */
-@Deprecated("Use lowercaseChar() instead.", ReplaceWith("lowercaseChar()"))
-@DeprecatedSinceKotlin(warningSince = "1.5")
-public actual fun Char.toLowerCase(): Char = lowercaseCharImpl()
-
-/**
- * Converts this character to lower case using Unicode mapping rules of the invariant locale.
- *
- * This function performs one-to-one character mapping.
- * To support one-to-many character mapping use the [lowercase] function.
- * If this character has no mapping equivalent, the character itself is returned.
- *
- * @sample samples.text.Chars.lowercase
- */
-@SinceKotlin("1.5")
-@WasExperimental(ExperimentalStdlibApi::class)
-public actual fun Char.lowercaseChar(): Char = lowercaseCharImpl()
-
-/**
- * Converts this character to lower case using Unicode mapping rules of the invariant locale.
- *
- * This function supports one-to-many character mapping, thus the length of the returned string can be greater than one.
- * For example, `'\u0130'.lowercase()` returns `"\u0069\u0307"`,
- * where `'\u0130'` is the LATIN CAPITAL LETTER I WITH DOT ABOVE character (`İ`).
- * If this character has no lower case mapping, the result of `toString()` of this char is returned.
- *
- * @sample samples.text.Chars.lowercase
- */
-@SinceKotlin("1.5")
-@WasExperimental(ExperimentalStdlibApi::class)
-public actual fun Char.lowercase(): String = lowercaseImpl()
-
-/**
- * Converts this character to upper case using Unicode mapping rules of the invariant locale.
- */
-@Deprecated("Use uppercaseChar() instead.", ReplaceWith("uppercaseChar()"))
-@DeprecatedSinceKotlin(warningSince = "1.5")
-public actual fun Char.toUpperCase(): Char = uppercaseCharImpl()
-
-/**
- * Converts this character to upper case using Unicode mapping rules of the invariant locale.
- *
- * This function performs one-to-one character mapping.
- * To support one-to-many character mapping use the [uppercase] function.
- * If this character has no mapping equivalent, the character itself is returned.
- *
- * @sample samples.text.Chars.uppercase
- */
-@SinceKotlin("1.5")
-@WasExperimental(ExperimentalStdlibApi::class)
-public actual fun Char.uppercaseChar(): Char = uppercaseCharImpl()
-
-/**
- * Converts this character to upper case using Unicode mapping rules of the invariant locale.
- *
- * This function supports one-to-many character mapping, thus the length of the returned string can be greater than one.
- * For example, `'\uFB00'.uppercase()` returns `"\u0046\u0046"`,
- * where `'\uFB00'` is the LATIN SMALL LIGATURE FF character (`ff`).
- * If this character has no upper case mapping, the result of `toString()` of this char is returned.
- *
- * @sample samples.text.Chars.uppercase
- */
-@SinceKotlin("1.5")
-@WasExperimental(ExperimentalStdlibApi::class)
-public actual fun Char.uppercase(): String = uppercaseImpl()
-
-/**
- * Converts this character to title case using Unicode mapping rules of the invariant locale.
- *
- * This function performs one-to-one character mapping.
- * To support one-to-many character mapping use the [titlecase] function.
- * If this character has no mapping equivalent, the result of calling [uppercaseChar] is returned.
- *
- * @sample samples.text.Chars.titlecase
- */
-@SinceKotlin("1.5")
-public actual fun Char.titlecaseChar(): Char = titlecaseCharImpl()
-
-
-/**
- * Returns the Unicode general category of this character.
- */
-@SinceKotlin("1.5")
-public actual val Char.category: CharCategory
-    get() = CharCategory.valueOf(getCategoryValue())
-
-/**
- * Returns `true` if this character (Unicode code point) is defined in Unicode.
- *
- * A character is considered to be defined in Unicode if its [category] is not [CharCategory.UNASSIGNED].
- */
-@SinceKotlin("1.5")
-public actual fun Char.isDefined(): Boolean {
-    if (this < '\u0080') {
-        return true
-    }
-    return getCategoryValue() != CharCategory.UNASSIGNED.value
-}
-
-/**
- * Returns `true` if this character is a letter.
- *
- * A character is considered to be a letter if its [category] is [CharCategory.UPPERCASE_LETTER],
- * [CharCategory.LOWERCASE_LETTER], [CharCategory.TITLECASE_LETTER], [CharCategory.MODIFIER_LETTER], or [CharCategory.OTHER_LETTER].
- *
- * @sample samples.text.Chars.isLetter
- */
-@SinceKotlin("1.5")
-public actual fun Char.isLetter(): Boolean {
-    if (this in 'a'..'z' || this in 'A'..'Z') {
-        return true
-    }
-    if (this < '\u0080') {
-        return false
-    }
-    return isLetterImpl()
-}
-
-/**
- * Returns `true` if this character is a letter or digit.
- *
- * @see isLetter
- * @see isDigit
- *
- * @sample samples.text.Chars.isLetterOrDigit
- */
-@SinceKotlin("1.5")
-public actual fun Char.isLetterOrDigit(): Boolean {
-    if (this in 'a'..'z' || this in 'A'..'Z' || this in '0'..'9') {
-        return true
-    }
-    if (this < '\u0080') {
-        return false
-    }
-
-    return isDigit() || isLetter()
-}
-
-/**
- * Returns `true` if this character is a digit.
- *
- * A character is considered to be a digit if its [category] is [CharCategory.DECIMAL_DIGIT_NUMBER].
- *
- * @sample samples.text.Chars.isDigit
- */
-@SinceKotlin("1.5")
-public actual fun Char.isDigit(): Boolean {
-    if (this in '0'..'9') {
-        return true
-    }
-    if (this < '\u0080') {
-        return false
-    }
-    return isDigitImpl()
-}
-
-/**
- * Returns `true` if this character is an upper case letter.
- *
- * A character is considered to be an upper case letter if its [category] is [CharCategory.UPPERCASE_LETTER].
- *
- * @sample samples.text.Chars.isUpperCase
- */
-@SinceKotlin("1.5")
-public actual fun Char.isUpperCase(): Boolean {
-    if (this in 'A'..'Z') {
-        return true
-    }
-    if (this < '\u0080') {
-        return false
-    }
-    return isUpperCaseImpl()
-}
-
-/**
- * Returns `true` if this character is a lower case letter.
- *
- * A character is considered to be a lower case letter if its [category] is [CharCategory.LOWERCASE_LETTER].
- *
- * @sample samples.text.Chars.isLowerCase
- */
-@SinceKotlin("1.5")
-public actual fun Char.isLowerCase(): Boolean {
-    if (this in 'a'..'z') {
-        return true
-    }
-    if (this < '\u0080') {
-        return false
-    }
-    return isLowerCaseImpl()
-}
-
-/**
- * Returns `true` if this character is a title case letter.
- *
- * A character is considered to be a title case letter if its [category] is [CharCategory.TITLECASE_LETTER].
- *
- * @sample samples.text.Chars.isTitleCase
- */
-@SinceKotlin("1.5")
-public actual fun Char.isTitleCase(): Boolean {
-    if (this < '\u0080') {
-        return false
-    }
-    return getCategoryValue() == CharCategory.TITLECASE_LETTER.value
-}
-
-/**
- * Returns `true` if this character is an ISO control character.
- *
- * A character is considered to be an ISO control character if its [category] is [CharCategory.CONTROL].
- *
- * @sample samples.text.Chars.isISOControl
- */
-@SinceKotlin("1.5")
-public actual fun Char.isISOControl(): Boolean {
-    return this <= '\u001F' || this in '\u007F'..'\u009F'
-}
-
-/**
- * Determines whether a character is whitespace according to the Unicode standard.
- * Returns `true` if the character is whitespace.
- *
- * @sample samples.text.Chars.isWhitespace
- */
-public actual fun Char.isWhitespace(): Boolean = isWhitespaceImpl()
-
-// From string.kt
-
-
-/**
- * Converts the characters in the specified array to a string.
- */
-@SinceKotlin("1.2")
-@Deprecated("Use CharArray.concatToString() instead", ReplaceWith("chars.concatToString()"))
-@DeprecatedSinceKotlin(warningSince = "1.4", errorSince = "1.5")
-public actual fun String(chars: CharArray): String {
-    var result = ""
-    for (char in chars) {
-        result += char
-    }
-    return result
-}
-
-/**
- * Converts the characters from a portion of the specified array to a string.
- *
- * @throws IndexOutOfBoundsException if either [offset] or [length] are less than zero
- * or `offset + length` is out of [chars] array bounds.
- */
-@SinceKotlin("1.2")
-@Deprecated("Use CharArray.concatToString(startIndex, endIndex) instead", ReplaceWith("chars.concatToString(offset, offset + length)"))
-@DeprecatedSinceKotlin(warningSince = "1.4", errorSince = "1.5")
-public actual fun String(chars: CharArray, offset: Int, length: Int): String {
-    if (offset < 0 || length < 0 || chars.size - offset < length)
-        throw IndexOutOfBoundsException("size: ${chars.size}; offset: $offset; length: $length")
-    var result = ""
-    for (index in offset until offset + length) {
-        result += chars[index]
-    }
-    return result
-}
-
-/**
- * Concatenates characters in this [CharArray] into a String.
- */
-@SinceKotlin("1.4")
-@WasExperimental(ExperimentalStdlibApi::class)
-public actual fun CharArray.concatToString(): String {
-    var result = ""
-    for (char in this) {
-        result += char
-    }
-    return result
-}
-
-/**
- * Concatenates characters in this [CharArray] or its subrange into a String.
- *
- * @param startIndex the beginning (inclusive) of the subrange of characters, 0 by default.
- * @param endIndex the end (exclusive) of the subrange of characters, size of this array by default.
- *
- * @throws IndexOutOfBoundsException if [startIndex] is less than zero or [endIndex] is greater than the size of this array.
- * @throws IllegalArgumentException if [startIndex] is greater than [endIndex].
- */
-@SinceKotlin("1.4")
-@WasExperimental(ExperimentalStdlibApi::class)
-@Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
-public actual fun CharArray.concatToString(startIndex: Int = 0, endIndex: Int = this.size): String {
-    AbstractList.checkBoundsIndexes(startIndex, endIndex, this.size)
-    var result = ""
-    for (index in startIndex until endIndex) {
-        result += this[index]
-    }
-    return result
-}
-
-/**
- * Returns a [CharArray] containing characters of this string.
- */
-@SinceKotlin("1.4")
-@WasExperimental(ExperimentalStdlibApi::class)
-public actual fun String.toCharArray(): CharArray {
-    return CharArray(length) { get(it) }
-}
-
-/**
- * Returns a [CharArray] containing characters of this string or its substring.
- *
- * @param startIndex the beginning (inclusive) of the substring, 0 by default.
- * @param endIndex the end (exclusive) of the substring, length of this string by default.
- *
- * @throws IndexOutOfBoundsException if [startIndex] is less than zero or [endIndex] is greater than the length of this string.
- * @throws IllegalArgumentException if [startIndex] is greater than [endIndex].
- */
-@SinceKotlin("1.4")
-@WasExperimental(ExperimentalStdlibApi::class)
-@Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
-public actual fun String.toCharArray(startIndex: Int = 0, endIndex: Int = this.length): CharArray {
-    AbstractList.checkBoundsIndexes(startIndex, endIndex, length)
-    return CharArray(endIndex - startIndex) { get(startIndex + it) }
-}
-
-/**
- * Decodes a string from the bytes in UTF-8 encoding in this array.
- *
- * Malformed byte sequences are replaced by the replacement char `\uFFFD`.
- */
-@SinceKotlin("1.4")
-@WasExperimental(ExperimentalStdlibApi::class)
-public actual fun ByteArray.decodeToString(): String {
-    return decodeUtf8(this, 0, size, false)
-}
-
-/**
- * Decodes a string from the bytes in UTF-8 encoding in this array or its subrange.
- *
- * @param startIndex the beginning (inclusive) of the subrange to decode, 0 by default.
- * @param endIndex the end (exclusive) of the subrange to decode, size of this array by default.
- * @param throwOnInvalidSequence specifies whether to throw an exception on malformed byte sequence or replace it by the replacement char `\uFFFD`.
- *
- * @throws IndexOutOfBoundsException if [startIndex] is less than zero or [endIndex] is greater than the size of this array.
- * @throws IllegalArgumentException if [startIndex] is greater than [endIndex].
- * @throws CharacterCodingException if the byte array contains malformed UTF-8 byte sequence and [throwOnInvalidSequence] is true.
- */
-@SinceKotlin("1.4")
-@WasExperimental(ExperimentalStdlibApi::class)
-@Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
-public actual fun ByteArray.decodeToString(
-    startIndex: Int = 0,
-    endIndex: Int = this.size,
-    throwOnInvalidSequence: Boolean = false
-): String {
-    AbstractList.checkBoundsIndexes(startIndex, endIndex, this.size)
-    return decodeUtf8(this, startIndex, endIndex, throwOnInvalidSequence)
-}
-
-/**
- * Encodes this string to an array of bytes in UTF-8 encoding.
- *
- * Any malformed char sequence is replaced by the replacement byte sequence.
- */
-@SinceKotlin("1.4")
-@WasExperimental(ExperimentalStdlibApi::class)
-public actual fun String.encodeToByteArray(): ByteArray {
-    return encodeUtf8(this, 0, length, false)
-}
-
-/**
- * Encodes this string or its substring to an array of bytes in UTF-8 encoding.
- *
- * @param startIndex the beginning (inclusive) of the substring to encode, 0 by default.
- * @param endIndex the end (exclusive) of the substring to encode, length of this string by default.
- * @param throwOnInvalidSequence specifies whether to throw an exception on malformed char sequence or replace.
- *
- * @throws IndexOutOfBoundsException if [startIndex] is less than zero or [endIndex] is greater than the length of this string.
- * @throws IllegalArgumentException if [startIndex] is greater than [endIndex].
- * @throws CharacterCodingException if this string contains malformed char sequence and [throwOnInvalidSequence] is true.
- */
-@SinceKotlin("1.4")
-@WasExperimental(ExperimentalStdlibApi::class)
-@Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
-public actual fun String.encodeToByteArray(
-    startIndex: Int = 0,
-    endIndex: Int = this.length,
-    throwOnInvalidSequence: Boolean = false
-): ByteArray {
-    AbstractList.checkBoundsIndexes(startIndex, endIndex, length)
-    return encodeUtf8(this, startIndex, endIndex, throwOnInvalidSequence)
-}
-
-/**
- * Returns a substring of this string that starts at the specified [startIndex] and continues to the end of the string.
- */
-public actual fun String.substring(startIndex: Int): String =
-    subSequence(startIndex, this.length) as String
-
-/**
- * Returns the substring of this string starting at the [startIndex] and ending right before the [endIndex].
- *
- * @param startIndex the start index (inclusive).
- * @param endIndex the end index (exclusive).
- */
-public actual fun String.substring(startIndex: Int, endIndex: Int): String =
-    subSequence(startIndex, endIndex) as String
-
-/**
- * Returns a copy of this string converted to upper case using the rules of the default locale.
- */
-@Deprecated("Use uppercase() instead.", ReplaceWith("uppercase()"))
-@DeprecatedSinceKotlin(warningSince = "1.5")
-public actual fun String.toUpperCase(): String = uppercase()
-
-/**
- * Returns a copy of this string converted to upper case using Unicode mapping rules of the invariant locale.
- *
- * This function supports one-to-many and many-to-one character mapping,
- * thus the length of the returned string can be different from the length of the original string.
- *
- * @sample samples.text.Strings.uppercase
- */
-@SinceKotlin("1.5")
-public actual fun String.uppercase(): String = uppercaseImpl()
-
-/**
- * Returns a copy of this string converted to lower case using the rules of the default locale.
- */
-@Deprecated("Use lowercase() instead.", ReplaceWith("lowercase()"))
-@DeprecatedSinceKotlin(warningSince = "1.5")
-public actual fun String.toLowerCase(): String = lowercase()
-
-/**
- * Returns a copy of this string converted to lower case using Unicode mapping rules of the invariant locale.
- *
- * This function supports one-to-many and many-to-one character mapping,
- * thus the length of the returned string can be different from the length of the original string.
- *
- * @sample samples.text.Strings.lowercase
- */
-@SinceKotlin("1.5")
-public actual fun String.lowercase(): String = lowercaseImpl()
-
-/**
- * Returns a copy of this string having its first letter titlecased using the rules of the default locale,
- * or the original string if it's empty or already starts with a title case letter.
- *
- * The title case of a character is usually the same as its upper case with several exceptions.
- * The particular list of characters with the special title case form depends on the underlying platform.
- *
- * @sample samples.text.Strings.capitalize
- */
-@Deprecated("Use replaceFirstChar instead.", ReplaceWith("replaceFirstChar { if (it.isLowerCase()) it.titlecase() else it.toString() }"))
-@DeprecatedSinceKotlin(warningSince = "1.5")
-public actual fun String.capitalize(): String = replaceFirstChar(Char::uppercaseChar)
-
-/**
- * Returns a copy of this string having its first letter lowercased using the rules of the default locale,
- * or the original string if it's empty or already starts with a lower case letter.
- *
- * @sample samples.text.Strings.decapitalize
- */
-@Deprecated("Use replaceFirstChar instead.", ReplaceWith("replaceFirstChar { it.lowercase() }"))
-@DeprecatedSinceKotlin(warningSince = "1.5")
-public actual fun String.decapitalize(): String = replaceFirstChar(Char::lowercaseChar)
-
-/**
- * Returns a string containing this char sequence repeated [n] times.
- * @throws [IllegalArgumentException] when n < 0.
- * @sample samples.text.Strings.repeat
- */
-public actual fun CharSequence.repeat(n: Int): String {
-    require(n >= 0) { "Count 'n' must be non-negative, but was $n." }
-    return when (n) {
-        0 -> ""
-        1 -> this.toString()
-        else -> {
-            var result = ""
-            if (!isEmpty()) {
-                var s = this.toString()
-                var count = n
-                while (true) {
-                    if ((count and 1) == 1) {
-                        result += s
-                    }
-                    count = count ushr 1
-                    if (count == 0) {
-                        break
-                    }
-                    s += s
-                }
-            }
-            return result
-        }
-    }
-}
-
-/**
- * Returns a new string with all occurrences of [oldChar] replaced with [newChar].
- */
-@Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
-public actual fun String.replace(oldChar: Char, newChar: Char, ignoreCase: Boolean = false): String {
-    return buildString(length) {
-        this@replace.forEach { c ->
-            append(if (c.equals(oldChar, ignoreCase)) newChar else c)
-        }
-    }
-}
-
-/**
- * Returns a new string obtained by replacing all occurrences of the [oldValue] substring in this string
- * with the specified [newValue] string.
- */
-@Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
-public actual fun String.replace(oldValue: String, newValue: String, ignoreCase: Boolean = false): String {
-    run {
-        var occurrenceIndex: Int = indexOf(oldValue, 0, ignoreCase)
-        // FAST PATH: no match
-        if (occurrenceIndex < 0) return this
-
-        val oldValueLength = oldValue.length
-        val searchStep = oldValueLength.coerceAtLeast(1)
-        val newLengthHint = length - oldValueLength + newValue.length
-        if (newLengthHint < 0) throw OutOfMemoryError()
-        val stringBuilder = StringBuilder(newLengthHint)
-
-        var i = 0
-        do {
-            stringBuilder.append(this, i, occurrenceIndex).append(newValue)
-            i = occurrenceIndex + oldValueLength
-            if (occurrenceIndex >= length) break
-            occurrenceIndex = indexOf(oldValue, occurrenceIndex + searchStep, ignoreCase)
-        } while (occurrenceIndex > 0)
-        return stringBuilder.append(this, i, length).toString()
-    }
-}
-
-/**
- * Returns a new string with the first occurrence of [oldChar] replaced with [newChar].
- */
-@Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
-public actual fun String.replaceFirst(oldChar: Char, newChar: Char, ignoreCase: Boolean = false): String {
-    val index = indexOf(oldChar, ignoreCase = ignoreCase)
-    return if (index < 0) this else this.replaceRange(index, index + 1, newChar.toString())
-}
-
-/**
- * Returns a new string obtained by replacing the first occurrence of the [oldValue] substring in this string
- * with the specified [newValue] string.
- */
-@Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
-public actual fun String.replaceFirst(oldValue: String, newValue: String, ignoreCase: Boolean = false): String {
-    val index = indexOf(oldValue, ignoreCase = ignoreCase)
-    return if (index < 0) this else this.replaceRange(index, index + oldValue.length, newValue)
-}
-
-/**
- * Returns `true` if this string is equal to [other], optionally ignoring character case.
- *
- * Two strings are considered to be equal if they have the same length and the same character at the same index.
- * If [ignoreCase] is true, the result of `Char.uppercaseChar().lowercaseChar()` on each character is compared.
- *
- * @param ignoreCase `true` to ignore character case when comparing strings. By default `false`.
- */
-@Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
-public actual fun String?.equals(other: String?, ignoreCase: Boolean = false): Boolean {
-    if (this == null) return other == null
-    if (other == null) return false
-    if (!ignoreCase) return this == other
-
-    if (this.length != other.length) return false
-
-    for (index in 0 until this.length) {
-        val thisChar = this[index]
-        val otherChar = other[index]
-        if (!thisChar.equals(otherChar, ignoreCase)) {
-            return false
-        }
-    }
-
-    return true
-}
-
-/**
- * Compares two strings lexicographically, optionally ignoring case differences.
- *
- * If [ignoreCase] is true, the result of `Char.uppercaseChar().lowercaseChar()` on each character is compared.
- */
-@SinceKotlin("1.2")
-@Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
-public actual fun String.compareTo(other: String, ignoreCase: Boolean = false): Int {
-    if (ignoreCase) {
-        val n1 = this.length
-        val n2 = other.length
-        val min = minOf(n1, n2)
-        if (min == 0) return n1 - n2
-        for (index in 0 until min) {
-            var thisChar = this[index]
-            var otherChar = other[index]
-
-            if (thisChar != otherChar) {
-                thisChar = thisChar.uppercaseChar()
-                otherChar = otherChar.uppercaseChar()
-
-                if (thisChar != otherChar) {
-                    thisChar = thisChar.lowercaseChar()
-                    otherChar = otherChar.lowercaseChar()
-
-                    if (thisChar != otherChar) {
-                        return thisChar.compareTo(otherChar)
-                    }
-                }
-            }
-        }
-        return n1 - n2
-    } else {
-        return compareTo(other)
-    }
-}
-
-/**
- * Returns `true` if the contents of this char sequence are equal to the contents of the specified [other],
- * i.e. both char sequences contain the same number of the same characters in the same order.
- *
- * @sample samples.text.Strings.contentEquals
- */
-@SinceKotlin("1.5")
-public actual infix fun CharSequence?.contentEquals(other: CharSequence?): Boolean = contentEqualsImpl(other)
-
-/**
- * Returns `true` if the contents of this char sequence are equal to the contents of the specified [other], optionally ignoring case difference.
- *
- * @param ignoreCase `true` to ignore character case when comparing contents.
- *
- * @sample samples.text.Strings.contentEquals
- */
-@SinceKotlin("1.5")
-public actual fun CharSequence?.contentEquals(other: CharSequence?, ignoreCase: Boolean): Boolean {
-    return if (ignoreCase)
-        this.contentEqualsIgnoreCaseImpl(other)
-    else
-        this.contentEqualsImpl(other)
-}
-
-/**
- * Returns `true` if this string starts with the specified prefix.
- */
-@Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
-public actual fun String.startsWith(prefix: String, ignoreCase: Boolean = false): Boolean =
-    regionMatches(0, prefix, 0, prefix.length, ignoreCase)
-
-/**
- * Returns `true` if a substring of this string starting at the specified offset [startIndex] starts with the specified prefix.
- */
-@Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
-public actual fun String.startsWith(prefix: String, startIndex: Int, ignoreCase: Boolean = false): Boolean =
-    regionMatches(startIndex, prefix, 0, prefix.length, ignoreCase)
-
-/**
- * Returns `true` if this string ends with the specified suffix.
- */
-@Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
-public actual fun String.endsWith(suffix: String, ignoreCase: Boolean = false): Boolean =
-    regionMatches(length - suffix.length, suffix, 0, suffix.length, ignoreCase)
-
-// From stringsCode.kt
-
-/**
- * Returns `true` if this string is empty or consists solely of whitespace characters.
- *
- * @sample samples.text.Strings.stringIsBlank
- */
-public actual fun CharSequence.isBlank(): Boolean = length == 0 || indices.all { this[it].isWhitespace() }
-
-/**
- * Returns `true` if the specified range in this char sequence is equal to the specified range in another char sequence.
- * @param thisOffset the start offset in this char sequence of the substring to compare.
- * @param other the string against a substring of which the comparison is performed.
- * @param otherOffset the start offset in the other char sequence of the substring to compare.
- * @param length the length of the substring to compare.
- */
-actual fun CharSequence.regionMatches(
-    thisOffset: Int,
-    other: CharSequence,
-    otherOffset: Int,
-    length: Int,
-    ignoreCase: Boolean
-): Boolean {
-    if ((otherOffset < 0) || (thisOffset < 0) || (thisOffset > this.length - length) || (otherOffset > other.length - length)) {
-        return false
-    }
-
-    for (index in 0 until length) {
-        if (!this[thisOffset + index].equals(other[otherOffset + index], ignoreCase))
-            return false
-    }
-    return true
-}
-
-private val STRING_CASE_INSENSITIVE_ORDER = Comparator<String> { a, b -> a.compareTo(b, ignoreCase = true) }
-
-/**
- * A Comparator that orders strings ignoring character case.
- *
- * Note that this Comparator does not take locale into account,
- * and will result in an unsatisfactory ordering for certain locales.
- */
-@SinceKotlin("1.2")
-public actual val String.Companion.CASE_INSENSITIVE_ORDER: Comparator<String>
-    get() = STRING_CASE_INSENSITIVE_ORDER
-
-/**
- * Returns `true` if the content of this string is equal to the word "true", ignoring case, and `false` otherwise.
- */
-@Deprecated("Use Kotlin compiler 1.4 to avoid deprecation warning.")
-@DeprecatedSinceKotlin(hiddenSince = "1.4")
-@kotlin.internal.InlineOnly
-actual fun String.toBoolean(): Boolean = this.toBoolean()
-
-/**
- * Returns `true` if the contents of this string is equal to the word "true", ignoring case, and `false` otherwise.
- *
- * There are also strict versions of the function available on non-nullable String, [toBooleanStrict] and [toBooleanStrictOrNull].
- */
-actual fun String?.toBoolean(): Boolean = this != null && this.lowercase() == "true"
-
-/**
- * Parses the string as a signed [Byte] number and returns the result.
- * @throws NumberFormatException if the string is not a valid representation of a number.
- */
-actual fun String.toByte(): Byte = toByteOrNull() ?: numberFormatError(this)
-
-/**
- * Parses the string as a signed [Byte] number and returns the result.
- * @throws NumberFormatException if the string is not a valid representation of a number.
- * @throws IllegalArgumentException when [radix] is not a valid radix for string to number conversion.
- */
-public actual fun String.toByte(radix: Int): Byte = toByteOrNull(radix) ?: numberFormatError(this)
-
-/**
- * Parses the string as a [Short] number and returns the result.
- * @throws NumberFormatException if the string is not a valid representation of a number.
- */
-public actual fun String.toShort(): Short = toShortOrNull() ?: numberFormatError(this)
-
-/**
- * Parses the string as a [Short] number and returns the result.
- * @throws NumberFormatException if the string is not a valid representation of a number.
- * @throws IllegalArgumentException when [radix] is not a valid radix for string to number conversion.
- */
-public actual fun String.toShort(radix: Int): Short = toShortOrNull(radix) ?: numberFormatError(this)
-
-/**
- * Parses the string as an [Int] number and returns the result.
- * @throws NumberFormatException if the string is not a valid representation of a number.
- */
-public actual fun String.toInt(): Int = toIntOrNull() ?: numberFormatError(this)
-
-/**
- * Parses the string as an [Int] number and returns the result.
- * @throws NumberFormatException if the string is not a valid representation of a number.
- * @throws IllegalArgumentException when [radix] is not a valid radix for string to number conversion.
- */
-public actual fun String.toInt(radix: Int): Int = toIntOrNull(radix) ?: numberFormatError(this)
-
-/**
- * Parses the string as a [Long] number and returns the result.
- * @throws NumberFormatException if the string is not a valid representation of a number.
- */
-public actual fun String.toLong(): Long = toLongOrNull() ?: numberFormatError(this)
-
-/**
- * Parses the string as a [Long] number and returns the result.
- * @throws NumberFormatException if the string is not a valid representation of a number.
- * @throws IllegalArgumentException when [radix] is not a valid radix for string to number conversion.
- */
-public actual fun String.toLong(radix: Int): Long = toLongOrNull(radix) ?: numberFormatError(this)
-
-/**
- * Parses the string as a [Double] number and returns the result.
- * @throws NumberFormatException if the string is not a valid representation of a number.
- */
-public actual fun String.toDouble(): Double = kotlin.text.parseDouble(this)
-
-/**
- * Parses the string as a [Float] number and returns the result.
- * @throws NumberFormatException if the string is not a valid representation of a number.
- */
-public actual fun String.toFloat(): Float = toDouble() as Float
-
-/**
- * Parses the string as a [Float] number and returns the result
- * or `null` if the string is not a valid representation of a number.
- */
-public actual fun String.toFloatOrNull(): Float? = toDoubleOrNull() as Float?
-
-/**
- * Parses the string as a [Double] number and returns the result
- * or `null` if the string is not a valid representation of a number.
- */
-public actual fun String.toDoubleOrNull(): Double? {
-    try {
-        return toDouble()
-    } catch (e: NumberFormatException) {
-        return null
-    }
-}
-
-/**
- * Returns a string representation of this [Byte] value in the specified [radix].
- *
- * @throws IllegalArgumentException when [radix] is not a valid radix for number to string conversion.
- */
-@SinceKotlin("1.2")
-public actual fun Byte.toString(radix: Int): String = this.toLong().toString(radix)
-
-/**
- * Returns a string representation of this [Short] value in the specified [radix].
- *
- * @throws IllegalArgumentException when [radix] is not a valid radix for number to string conversion.
- */
-@SinceKotlin("1.2")
-public actual fun Short.toString(radix: Int): String = this.toLong().toString(radix)
-
-/**
- * Returns a string representation of this [Int] value in the specified [radix].
- *
- * @throws IllegalArgumentException when [radix] is not a valid radix for number to string conversion.
- */
-@SinceKotlin("1.2")
-actual fun Int.toString(radix: Int): String = toLong().toString(radix)
-
-/**
- * Returns a string representation of this [Long] value in the specified [radix].
- *
- * @throws IllegalArgumentException when [radix] is not a valid radix for number to string conversion.
- */
-@SinceKotlin("1.2")
-actual fun Long.toString(radix: Int): String {
-    checkRadix(radix)
-
-    fun Long.getChar() = toInt().let { if (it < 10) '0' + it else 'a' + (it - 10) }
-
-    if (radix == 10) return toString()
-    if (this in 0 until radix) return getChar().toString()
-
-    val isNegative = this < 0
-    val buffer = CharArray(Long.SIZE_BITS + 1)
-
-    var currentBufferIndex= buffer.lastIndex
-    var current: Long = this
-    while(current != 0L) {
-        buffer[currentBufferIndex] = abs(current % radix).getChar()
-        current /= radix
-        currentBufferIndex--
-    }
-
-    if (isNegative) {
-        buffer[currentBufferIndex] = '-'
-        currentBufferIndex--
-    }
-
-    return buffer.concatToString(currentBufferIndex + 1)
-}
-
-@PublishedApi
-internal actual fun checkRadix(radix: Int): Int {
-    if (radix !in Char.MIN_RADIX..Char.MAX_RADIX) {
-        throw IllegalArgumentException("radix $radix was not in valid range ${Char.MIN_RADIX..Char.MAX_RADIX}")
-    }
-    return radix
-}
-
-internal actual fun digitOf(char: Char, radix: Int): Int = when {
-    char >= '0' && char <= '9' -> char - '0'
-    char >= 'A' && char <= 'Z' -> char - 'A' + 10
-    char >= 'a' && char <= 'z' -> char - 'a' + 10
-    char < '\u0080' -> -1
-    char >= '\uFF21' && char <= '\uFF3A' -> char - '\uFF21' + 10 // full-width latin capital letter
-    char >= '\uFF41' && char <= '\uFF5A' -> char - '\uFF41' + 10 // full-width latin small letter
-    else -> char.digitToIntImpl()
-}.let { if (it >= radix) -1 else it }

libraries/stdlib/wasm/src/kotlin/text/Appendable.kt

@@ -1,37 +0,0 @@
-/*
- * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
- * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
- */
-
-package kotlin.text
-
-/**
- * An object to which char sequences and values can be appended.
- */
-actual interface Appendable {
-    /**
-     * Appends the specified character [value] to this Appendable and returns this instance.
-     *
-     * @param value the character to append.
-     */
-    actual fun append(value: Char): Appendable
-
-    /**
-     * Appends the specified character sequence [value] to this Appendable and returns this instance.
-     *
-     * @param value the character sequence to append. If [value] is `null`, then the four characters `"null"` are appended to this Appendable.
-     */
-    actual fun append(value: CharSequence?): Appendable
-
-    /**
-     * Appends a subsequence of the specified character sequence [value] to this Appendable and returns this instance.
-     *
-     * @param value the character sequence from which a subsequence is appended. If [value] is `null`,
-     *  then characters are appended as if [value] contained the four characters `"null"`.
-     * @param startIndex the beginning (inclusive) of the subsequence to append.
-     * @param endIndex the end (exclusive) of the subsequence to append.
-     *
-     * @throws IndexOutOfBoundsException or [IllegalArgumentException] when [startIndex] or [endIndex] is out of range of the [value] character sequence indices or when `startIndex > endIndex`.
-     */
-    actual fun append(value: CharSequence?, startIndex: Int, endIndex: Int): Appendable
-}

libraries/stdlib/wasm/src/kotlin/text/CharCategoryWasm.kt

@@ -1,176 +0,0 @@
-/*
- * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
- * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
- */
-
-package kotlin.text
-
-/**
- * Represents the character general category in the Unicode specification.
- */
-public actual enum class CharCategory(public val value: Int, public actual val code: String) {
-    /**
-     * General category "Cn" in the Unicode specification.
-     */
-    UNASSIGNED(0, "Cn"),
-
-    /**
-     * General category "Lu" in the Unicode specification.
-     */
-    UPPERCASE_LETTER(1, "Lu"),
-
-    /**
-     * General category "Ll" in the Unicode specification.
-     */
-    LOWERCASE_LETTER(2, "Ll"),
-
-    /**
-     * General category "Lt" in the Unicode specification.
-     */
-    TITLECASE_LETTER(3, "Lt"),
-
-    /**
-     * General category "Lm" in the Unicode specification.
-     */
-    MODIFIER_LETTER(4, "Lm"),
-
-    /**
-     * General category "Lo" in the Unicode specification.
-     */
-    OTHER_LETTER(5, "Lo"),
-
-    /**
-     * General category "Mn" in the Unicode specification.
-     */
-    NON_SPACING_MARK(6, "Mn"),
-
-    /**
-     * General category "Me" in the Unicode specification.
-     */
-    ENCLOSING_MARK(7, "Me"),
-
-    /**
-     * General category "Mc" in the Unicode specification.
-     */
-    COMBINING_SPACING_MARK(8, "Mc"),
-
-    /**
-     * General category "Nd" in the Unicode specification.
-     */
-    DECIMAL_DIGIT_NUMBER(9, "Nd"),
-
-    /**
-     * General category "Nl" in the Unicode specification.
-     */
-    LETTER_NUMBER(10, "Nl"),
-
-    /**
-     * General category "No" in the Unicode specification.
-     */
-    OTHER_NUMBER(11, "No"),
-
-    /**
-     * General category "Zs" in the Unicode specification.
-     */
-    SPACE_SEPARATOR(12, "Zs"),
-
-    /**
-     * General category "Zl" in the Unicode specification.
-     */
-    LINE_SEPARATOR(13, "Zl"),
-
-    /**
-     * General category "Zp" in the Unicode specification.
-     */
-    PARAGRAPH_SEPARATOR(14, "Zp"),
-
-    /**
-     * General category "Cc" in the Unicode specification.
-     */
-    CONTROL(15, "Cc"),
-
-    /**
-     * General category "Cf" in the Unicode specification.
-     */
-    FORMAT(16, "Cf"),
-
-    /**
-     * General category "Co" in the Unicode specification.
-     */
-    PRIVATE_USE(18, "Co"),
-
-    /**
-     * General category "Cs" in the Unicode specification.
-     */
-    SURROGATE(19, "Cs"),
-
-    /**
-     * General category "Pd" in the Unicode specification.
-     */
-    DASH_PUNCTUATION(20, "Pd"),
-
-    /**
-     * General category "Ps" in the Unicode specification.
-     */
-    START_PUNCTUATION(21, "Ps"),
-
-    /**
-     * General category "Pe" in the Unicode specification.
-     */
-    END_PUNCTUATION(22, "Pe"),
-
-    /**
-     * General category "Pc" in the Unicode specification.
-     */
-    CONNECTOR_PUNCTUATION(23, "Pc"),
-
-    /**
-     * General category "Po" in the Unicode specification.
-     */
-    OTHER_PUNCTUATION(24, "Po"),
-
-    /**
-     * General category "Sm" in the Unicode specification.
-     */
-    MATH_SYMBOL(25, "Sm"),
-
-    /**
-     * General category "Sc" in the Unicode specification.
-     */
-    CURRENCY_SYMBOL(26, "Sc"),
-
-    /**
-     * General category "Sk" in the Unicode specification.
-     */
-    MODIFIER_SYMBOL(27, "Sk"),
-
-    /**
-     * General category "So" in the Unicode specification.
-     */
-    OTHER_SYMBOL(28, "So"),
-
-    /**
-     * General category "Pi" in the Unicode specification.
-     */
-    INITIAL_QUOTE_PUNCTUATION(29, "Pi"),
-
-    /**
-     * General category "Pf" in the Unicode specification.
-     */
-    FINAL_QUOTE_PUNCTUATION(30, "Pf");
-
-    /**
-     * Returns `true` if [char] character belongs to this category.
-     */
-    public actual operator fun contains(char: Char): Boolean = char.getCategoryValue() == this.value
-
-    public companion object {
-        public fun valueOf(category: Int): CharCategory =
-            when (category) {
-                in 0..16 -> values()[category]
-                in 18..30 -> values()[category - 1]
-                else -> throw IllegalArgumentException("Category #$category is not defined.")
-            }
-
-    }
-}

libraries/stdlib/wasm/src/kotlin/text/CharWasm.kt

@@ -5,5 +5,34 @@
 
 package kotlin.text
 
-internal fun Char.Companion.toCodePoint(high: Char, low: Char): Int =
-    (((high - MIN_HIGH_SURROGATE) shl 10) or (low - MIN_LOW_SURROGATE)) + 0x10000
+/**
+ * Returns `true` if this character is an ISO control character.
+ *
+ * A character is considered to be an ISO control character if its [category] is [CharCategory.CONTROL].
+ *
+ * @sample samples.text.Chars.isISOControl
+ */
+@SinceKotlin("1.5")
+public actual fun Char.isISOControl(): Boolean {
+    return this <= '\u001F' || this in '\u007F'..'\u009F'
+}
+
+/**
+ * Returns `true` if this character is a Unicode high-surrogate code unit (also known as leading-surrogate code unit).
+ */
+public actual fun Char.isHighSurrogate(): Boolean = this in Char.MIN_HIGH_SURROGATE..Char.MAX_HIGH_SURROGATE
+
+/**
+ * Returns `true` if this character is a Unicode low-surrogate code unit (also known as trailing-surrogate code unit).
+ */
+public actual fun Char.isLowSurrogate(): Boolean = this in Char.MIN_LOW_SURROGATE..Char.MAX_LOW_SURROGATE
+
+internal actual fun digitOf(char: Char, radix: Int): Int = when {
+    char >= '0' && char <= '9' -> char - '0'
+    char >= 'A' && char <= 'Z' -> char - 'A' + 10
+    char >= 'a' && char <= 'z' -> char - 'a' + 10
+    char < '\u0080' -> -1
+    char >= '\uFF21' && char <= '\uFF3A' -> char - '\uFF21' + 10 // full-width latin capital letter
+    char >= '\uFF41' && char <= '\uFF5A' -> char - '\uFF41' + 10 // full-width latin small letter
+    else -> char.digitToIntImpl()
+}.let { if (it >= radix) -1 else it }

libraries/stdlib/wasm/src/kotlin/text/StringNumberConversionsWasm.kt

@@ -0,0 +1,162 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package kotlin.text
+
+import kotlin.math.abs
+
+/**
+ * Returns `true` if the content of this string is equal to the word "true", ignoring case, and `false` otherwise.
+ */
+@Deprecated("Use Kotlin compiler 1.4 to avoid deprecation warning.")
+@DeprecatedSinceKotlin(hiddenSince = "1.4")
+@kotlin.internal.InlineOnly
+actual fun String.toBoolean(): Boolean = this.toBoolean()
+
+/**
+ * Returns `true` if the contents of this string is equal to the word "true", ignoring case, and `false` otherwise.
+ *
+ * There are also strict versions of the function available on non-nullable String, [toBooleanStrict] and [toBooleanStrictOrNull].
+ */
+actual fun String?.toBoolean(): Boolean = this != null && this.lowercase() == "true"
+
+/**
+ * Parses the string as a signed [Byte] number and returns the result.
+ * @throws NumberFormatException if the string is not a valid representation of a number.
+ */
+actual fun String.toByte(): Byte = toByteOrNull() ?: numberFormatError(this)
+
+/**
+ * Parses the string as a signed [Byte] number and returns the result.
+ * @throws NumberFormatException if the string is not a valid representation of a number.
+ * @throws IllegalArgumentException when [radix] is not a valid radix for string to number conversion.
+ */
+public actual fun String.toByte(radix: Int): Byte = toByteOrNull(radix) ?: numberFormatError(this)
+
+/**
+ * Parses the string as a [Short] number and returns the result.
+ * @throws NumberFormatException if the string is not a valid representation of a number.
+ */
+public actual fun String.toShort(): Short = toShortOrNull() ?: numberFormatError(this)
+
+/**
+ * Parses the string as a [Short] number and returns the result.
+ * @throws NumberFormatException if the string is not a valid representation of a number.
+ * @throws IllegalArgumentException when [radix] is not a valid radix for string to number conversion.
+ */
+public actual fun String.toShort(radix: Int): Short = toShortOrNull(radix) ?: numberFormatError(this)
+
+/**
+ * Parses the string as an [Int] number and returns the result.
+ * @throws NumberFormatException if the string is not a valid representation of a number.
+ */
+public actual fun String.toInt(): Int = toIntOrNull() ?: numberFormatError(this)
+
+/**
+ * Parses the string as an [Int] number and returns the result.
+ * @throws NumberFormatException if the string is not a valid representation of a number.
+ * @throws IllegalArgumentException when [radix] is not a valid radix for string to number conversion.
+ */
+public actual fun String.toInt(radix: Int): Int = toIntOrNull(radix) ?: numberFormatError(this)
+
+/**
+ * Parses the string as a [Long] number and returns the result.
+ * @throws NumberFormatException if the string is not a valid representation of a number.
+ */
+public actual fun String.toLong(): Long = toLongOrNull() ?: numberFormatError(this)
+
+/**
+ * Parses the string as a [Long] number and returns the result.
+ * @throws NumberFormatException if the string is not a valid representation of a number.
+ * @throws IllegalArgumentException when [radix] is not a valid radix for string to number conversion.
+ */
+public actual fun String.toLong(radix: Int): Long = toLongOrNull(radix) ?: numberFormatError(this)
+
+/**
+ * Parses the string as a [Double] number and returns the result.
+ * @throws NumberFormatException if the string is not a valid representation of a number.
+ */
+public actual fun String.toDouble(): Double = kotlin.text.parseDouble(this)
+
+/**
+ * Parses the string as a [Float] number and returns the result.
+ * @throws NumberFormatException if the string is not a valid representation of a number.
+ */
+public actual fun String.toFloat(): Float = toDouble() as Float
+
+/**
+ * Parses the string as a [Float] number and returns the result
+ * or `null` if the string is not a valid representation of a number.
+ */
+public actual fun String.toFloatOrNull(): Float? = toDoubleOrNull() as Float?
+
+/**
+ * Parses the string as a [Double] number and returns the result
+ * or `null` if the string is not a valid representation of a number.
+ */
+public actual fun String.toDoubleOrNull(): Double? {
+    try {
+        return toDouble()
+    } catch (e: NumberFormatException) {
+        return null
+    }
+}
+
+/**
+ * Returns a string representation of this [Byte] value in the specified [radix].
+ *
+ * @throws IllegalArgumentException when [radix] is not a valid radix for number to string conversion.
+ */
+@SinceKotlin("1.2")
+public actual fun Byte.toString(radix: Int): String = this.toLong().toString(radix)
+
+/**
+ * Returns a string representation of this [Short] value in the specified [radix].
+ *
+ * @throws IllegalArgumentException when [radix] is not a valid radix for number to string conversion.
+ */
+@SinceKotlin("1.2")
+public actual fun Short.toString(radix: Int): String = this.toLong().toString(radix)
+
+/**
+ * Returns a string representation of this [Int] value in the specified [radix].
+ *
+ * @throws IllegalArgumentException when [radix] is not a valid radix for number to string conversion.
+ */
+@SinceKotlin("1.2")
+actual fun Int.toString(radix: Int): String = toLong().toString(radix)
+
+/**
+ * Returns a string representation of this [Long] value in the specified [radix].
+ *
+ * @throws IllegalArgumentException when [radix] is not a valid radix for number to string conversion.
+ */
+@SinceKotlin("1.2")
+actual fun Long.toString(radix: Int): String {
+    checkRadix(radix)
+
+    fun Long.getChar() = toInt().let { if (it < 10) '0' + it else 'a' + (it - 10) }
+
+    if (radix == 10) return toString()
+    if (this in 0 until radix) return getChar().toString()
+
+    val isNegative = this < 0
+    val buffer = CharArray(Long.SIZE_BITS + 1)
+
+    var currentBufferIndex = buffer.lastIndex
+    var current: Long = this
+    while(current != 0L) {
+        buffer[currentBufferIndex] = abs(current % radix).getChar()
+        current /= radix
+        currentBufferIndex--
+    }
+
+    if (isNegative) {
+        buffer[currentBufferIndex] = '-'
+        currentBufferIndex--
+    }
+
+    return buffer.concatToString(currentBufferIndex + 1)
+}

libraries/stdlib/wasm/src/kotlin/text/StringsWasm.kt

@@ -29,7 +29,7 @@ internal actual fun String.nativeLastIndexOf(ch: Char, fromIndex: Int): Int {
  * Returns the index within this string of the first occurrence of the specified substring, starting from the specified offset.
  */
 internal actual fun String.nativeIndexOf(str: String, fromIndex: Int): Int {
-    for (index in fromIndex.coerceAtLeast(0)..this.length) {
+    for (index in fromIndex.coerceAtLeast(0)..(this.length - str.length)) {
         if (str.regionMatchesImpl(0, this, index, str.length, false)) {
             return index
         }
@@ -41,10 +41,461 @@ internal actual fun String.nativeIndexOf(str: String, fromIndex: Int): Int {
  * Returns the index within this string of the last occurrence of the specified character, starting from the specified offset.
  */
 internal actual fun String.nativeLastIndexOf(str: String, fromIndex: Int): Int {
-    for (index in fromIndex.coerceAtMost(this.lastIndex) downTo 0) {
+    for (index in fromIndex.coerceAtMost(this.length - str.length) downTo 0) {
         if (str.regionMatchesImpl(0, this, index, str.length, false)) {
             return index
         }
     }
     return -1
-}
+}
+
+/**
+ * Converts the characters in the specified array to a string.
+ */
+@SinceKotlin("1.2")
+@Deprecated("Use CharArray.concatToString() instead", ReplaceWith("chars.concatToString()"))
+@DeprecatedSinceKotlin(warningSince = "1.4", errorSince = "1.5")
+public actual fun String(chars: CharArray): String {
+    var result = ""
+    for (char in chars) {
+        result += char
+    }
+    return result
+}
+
+/**
+ * Converts the characters from a portion of the specified array to a string.
+ *
+ * @throws IndexOutOfBoundsException if either [offset] or [length] are less than zero
+ * or `offset + length` is out of [chars] array bounds.
+ */
+@SinceKotlin("1.2")
+@Deprecated("Use CharArray.concatToString(startIndex, endIndex) instead", ReplaceWith("chars.concatToString(offset, offset + length)"))
+@DeprecatedSinceKotlin(warningSince = "1.4", errorSince = "1.5")
+public actual fun String(chars: CharArray, offset: Int, length: Int): String {
+    if (offset < 0 || length < 0 || chars.size - offset < length)
+        throw IndexOutOfBoundsException("size: ${chars.size}; offset: $offset; length: $length")
+    var result = ""
+    for (index in offset until offset + length) {
+        result += chars[index]
+    }
+    return result
+}
+
+/**
+ * Concatenates characters in this [CharArray] into a String.
+ */
+@SinceKotlin("1.4")
+@WasExperimental(ExperimentalStdlibApi::class)
+public actual fun CharArray.concatToString(): String =
+    String.unsafeFromCharArray(this.copyOf())
+
+/**
+ * Concatenates characters in this [CharArray] or its subrange into a String.
+ *
+ * @param startIndex the beginning (inclusive) of the subrange of characters, 0 by default.
+ * @param endIndex the end (exclusive) of the subrange of characters, size of this array by default.
+ *
+ * @throws IndexOutOfBoundsException if [startIndex] is less than zero or [endIndex] is greater than the size of this array.
+ * @throws IllegalArgumentException if [startIndex] is greater than [endIndex].
+ */
+@SinceKotlin("1.4")
+@WasExperimental(ExperimentalStdlibApi::class)
+@Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
+public actual fun CharArray.concatToString(startIndex: Int = 0, endIndex: Int = this.size): String {
+    AbstractList.checkBoundsIndexes(startIndex, endIndex, this.size)
+    return String.unsafeFromCharArray(this.copyOfRange(startIndex, endIndex))
+}
+
+/**
+ * Returns a [CharArray] containing characters of this string.
+ */
+@SinceKotlin("1.4")
+@WasExperimental(ExperimentalStdlibApi::class)
+public actual fun String.toCharArray(): CharArray {
+    return CharArray(length) { get(it) }
+}
+
+/**
+ * Returns a [CharArray] containing characters of this string or its substring.
+ *
+ * @param startIndex the beginning (inclusive) of the substring, 0 by default.
+ * @param endIndex the end (exclusive) of the substring, length of this string by default.
+ *
+ * @throws IndexOutOfBoundsException if [startIndex] is less than zero or [endIndex] is greater than the length of this string.
+ * @throws IllegalArgumentException if [startIndex] is greater than [endIndex].
+ */
+@SinceKotlin("1.4")
+@WasExperimental(ExperimentalStdlibApi::class)
+@Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
+public actual fun String.toCharArray(startIndex: Int = 0, endIndex: Int = this.length): CharArray {
+    AbstractList.checkBoundsIndexes(startIndex, endIndex, length)
+    return CharArray(endIndex - startIndex) { get(startIndex + it) }
+}
+
+/**
+ * Decodes a string from the bytes in UTF-8 encoding in this array.
+ *
+ * Malformed byte sequences are replaced by the replacement char `\uFFFD`.
+ */
+@SinceKotlin("1.4")
+@WasExperimental(ExperimentalStdlibApi::class)
+public actual fun ByteArray.decodeToString(): String {
+    return decodeUtf8(this, 0, size, false)
+}
+
+/**
+ * Decodes a string from the bytes in UTF-8 encoding in this array or its subrange.
+ *
+ * @param startIndex the beginning (inclusive) of the subrange to decode, 0 by default.
+ * @param endIndex the end (exclusive) of the subrange to decode, size of this array by default.
+ * @param throwOnInvalidSequence specifies whether to throw an exception on malformed byte sequence or replace it by the replacement char `\uFFFD`.
+ *
+ * @throws IndexOutOfBoundsException if [startIndex] is less than zero or [endIndex] is greater than the size of this array.
+ * @throws IllegalArgumentException if [startIndex] is greater than [endIndex].
+ * @throws CharacterCodingException if the byte array contains malformed UTF-8 byte sequence and [throwOnInvalidSequence] is true.
+ */
+@SinceKotlin("1.4")
+@WasExperimental(ExperimentalStdlibApi::class)
+@Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
+public actual fun ByteArray.decodeToString(
+    startIndex: Int = 0,
+    endIndex: Int = this.size,
+    throwOnInvalidSequence: Boolean = false
+): String {
+    AbstractList.checkBoundsIndexes(startIndex, endIndex, this.size)
+    return decodeUtf8(this, startIndex, endIndex, throwOnInvalidSequence)
+}
+
+/**
+ * Encodes this string to an array of bytes in UTF-8 encoding.
+ *
+ * Any malformed char sequence is replaced by the replacement byte sequence.
+ */
+@SinceKotlin("1.4")
+@WasExperimental(ExperimentalStdlibApi::class)
+public actual fun String.encodeToByteArray(): ByteArray {
+    return encodeUtf8(this, 0, length, false)
+}
+
+/**
+ * Encodes this string or its substring to an array of bytes in UTF-8 encoding.
+ *
+ * @param startIndex the beginning (inclusive) of the substring to encode, 0 by default.
+ * @param endIndex the end (exclusive) of the substring to encode, length of this string by default.
+ * @param throwOnInvalidSequence specifies whether to throw an exception on malformed char sequence or replace.
+ *
+ * @throws IndexOutOfBoundsException if [startIndex] is less than zero or [endIndex] is greater than the length of this string.
+ * @throws IllegalArgumentException if [startIndex] is greater than [endIndex].
+ * @throws CharacterCodingException if this string contains malformed char sequence and [throwOnInvalidSequence] is true.
+ */
+@SinceKotlin("1.4")
+@WasExperimental(ExperimentalStdlibApi::class)
+@Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
+public actual fun String.encodeToByteArray(
+    startIndex: Int = 0,
+    endIndex: Int = this.length,
+    throwOnInvalidSequence: Boolean = false
+): ByteArray {
+    AbstractList.checkBoundsIndexes(startIndex, endIndex, length)
+    return encodeUtf8(this, startIndex, endIndex, throwOnInvalidSequence)
+}
+
+/**
+ * Returns a substring of this string that starts at the specified [startIndex] and continues to the end of the string.
+ */
+public actual fun String.substring(startIndex: Int): String =
+    subSequence(startIndex, this.length) as String
+
+/**
+ * Returns the substring of this string starting at the [startIndex] and ending right before the [endIndex].
+ *
+ * @param startIndex the start index (inclusive).
+ * @param endIndex the end index (exclusive).
+ */
+public actual fun String.substring(startIndex: Int, endIndex: Int): String =
+    subSequence(startIndex, endIndex) as String
+
+/**
+ * Returns a copy of this string converted to upper case using the rules of the default locale.
+ */
+@Deprecated("Use uppercase() instead.", ReplaceWith("uppercase()"))
+@DeprecatedSinceKotlin(warningSince = "1.5")
+public actual fun String.toUpperCase(): String = uppercase()
+
+/**
+ * Returns a copy of this string converted to upper case using Unicode mapping rules of the invariant locale.
+ *
+ * This function supports one-to-many and many-to-one character mapping,
+ * thus the length of the returned string can be different from the length of the original string.
+ *
+ * @sample samples.text.Strings.uppercase
+ */
+@SinceKotlin("1.5")
+public actual fun String.uppercase(): String = uppercaseImpl()
+
+/**
+ * Returns a copy of this string converted to lower case using the rules of the default locale.
+ */
+@Deprecated("Use lowercase() instead.", ReplaceWith("lowercase()"))
+@DeprecatedSinceKotlin(warningSince = "1.5")
+public actual fun String.toLowerCase(): String = lowercase()
+
+/**
+ * Returns a copy of this string converted to lower case using Unicode mapping rules of the invariant locale.
+ *
+ * This function supports one-to-many and many-to-one character mapping,
+ * thus the length of the returned string can be different from the length of the original string.
+ *
+ * @sample samples.text.Strings.lowercase
+ */
+@SinceKotlin("1.5")
+public actual fun String.lowercase(): String = lowercaseImpl()
+
+/**
+ * Returns a copy of this string having its first letter titlecased using the rules of the default locale,
+ * or the original string if it's empty or already starts with a title case letter.
+ *
+ * The title case of a character is usually the same as its upper case with several exceptions.
+ * The particular list of characters with the special title case form depends on the underlying platform.
+ *
+ * @sample samples.text.Strings.capitalize
+ */
+@Deprecated("Use replaceFirstChar instead.", ReplaceWith("replaceFirstChar { if (it.isLowerCase()) it.titlecase() else it.toString() }"))
+@DeprecatedSinceKotlin(warningSince = "1.5")
+public actual fun String.capitalize(): String = replaceFirstChar(Char::uppercaseChar)
+
+/**
+ * Returns a copy of this string having its first letter lowercased using the rules of the default locale,
+ * or the original string if it's empty or already starts with a lower case letter.
+ *
+ * @sample samples.text.Strings.decapitalize
+ */
+@Deprecated("Use replaceFirstChar instead.", ReplaceWith("replaceFirstChar { it.lowercase() }"))
+@DeprecatedSinceKotlin(warningSince = "1.5")
+public actual fun String.decapitalize(): String = replaceFirstChar(Char::lowercaseChar)
+
+/**
+ * Returns a string containing this char sequence repeated [n] times.
+ * @throws [IllegalArgumentException] when n < 0.
+ * @sample samples.text.Strings.repeat
+ */
+public actual fun CharSequence.repeat(n: Int): String {
+    require(n >= 0) { "Count 'n' must be non-negative, but was $n." }
+    if (isEmpty()) return ""
+    return when (n) {
+        0 -> ""
+        1 -> this.toString()
+        else -> {
+            buildString(n * length) {
+                repeat(n) {
+                    append(this@repeat)
+                }
+            }
+        }
+    }
+}
+
+/**
+ * Returns a new string with all occurrences of [oldChar] replaced with [newChar].
+ */
+@Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
+public actual fun String.replace(oldChar: Char, newChar: Char, ignoreCase: Boolean = false): String {
+    return buildString(length) {
+        this@replace.forEach { c ->
+            append(if (c.equals(oldChar, ignoreCase)) newChar else c)
+        }
+    }
+}
+
+/**
+ * Returns a new string obtained by replacing all occurrences of the [oldValue] substring in this string
+ * with the specified [newValue] string.
+ */
+@Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
+public actual fun String.replace(oldValue: String, newValue: String, ignoreCase: Boolean = false): String {
+    run {
+        var occurrenceIndex: Int = indexOf(oldValue, 0, ignoreCase)
+        // FAST PATH: no match
+        if (occurrenceIndex < 0) return this
+
+        val oldValueLength = oldValue.length
+        val searchStep = oldValueLength.coerceAtLeast(1)
+        val newLengthHint = length - oldValueLength + newValue.length
+        if (newLengthHint < 0) throw OutOfMemoryError()
+        val stringBuilder = StringBuilder(newLengthHint)
+
+        var i = 0
+        do {
+            stringBuilder.append(this, i, occurrenceIndex).append(newValue)
+            i = occurrenceIndex + oldValueLength
+            if (occurrenceIndex >= length) break
+            occurrenceIndex = indexOf(oldValue, occurrenceIndex + searchStep, ignoreCase)
+        } while (occurrenceIndex > 0)
+        return stringBuilder.append(this, i, length).toString()
+    }
+}
+
+/**
+ * Returns a new string with the first occurrence of [oldChar] replaced with [newChar].
+ */
+@Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
+public actual fun String.replaceFirst(oldChar: Char, newChar: Char, ignoreCase: Boolean = false): String {
+    val index = indexOf(oldChar, ignoreCase = ignoreCase)
+    return if (index < 0) this else this.replaceRange(index, index + 1, newChar.toString())
+}
+
+/**
+ * Returns a new string obtained by replacing the first occurrence of the [oldValue] substring in this string
+ * with the specified [newValue] string.
+ */
+@Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
+public actual fun String.replaceFirst(oldValue: String, newValue: String, ignoreCase: Boolean = false): String {
+    val index = indexOf(oldValue, ignoreCase = ignoreCase)
+    return if (index < 0) this else this.replaceRange(index, index + oldValue.length, newValue)
+}
+
+/**
+ * Returns `true` if this string is equal to [other], optionally ignoring character case.
+ *
+ * Two strings are considered to be equal if they have the same length and the same character at the same index.
+ * If [ignoreCase] is true, the result of `Char.uppercaseChar().lowercaseChar()` on each character is compared.
+ *
+ * @param ignoreCase `true` to ignore character case when comparing strings. By default `false`.
+ */
+@Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
+public actual fun String?.equals(other: String?, ignoreCase: Boolean = false): Boolean {
+    if (this == null) return other == null
+    if (other == null) return false
+    if (!ignoreCase) return this == other
+
+    if (this.length != other.length) return false
+
+    for (index in 0 until this.length) {
+        val thisChar = this[index]
+        val otherChar = other[index]
+        if (!thisChar.equals(otherChar, ignoreCase)) {
+            return false
+        }
+    }
+
+    return true
+}
+
+/**
+ * Compares two strings lexicographically, optionally ignoring case differences.
+ *
+ * If [ignoreCase] is true, the result of `Char.uppercaseChar().lowercaseChar()` on each character is compared.
+ */
+@SinceKotlin("1.2")
+@Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
+public actual fun String.compareTo(other: String, ignoreCase: Boolean = false): Int {
+    if (ignoreCase) {
+        val n1 = this.length
+        val n2 = other.length
+        val min = minOf(n1, n2)
+        if (min == 0) return n1 - n2
+        for (index in 0 until min) {
+            var thisChar = this[index]
+            var otherChar = other[index]
+
+            if (thisChar != otherChar) {
+                thisChar = thisChar.uppercaseChar()
+                otherChar = otherChar.uppercaseChar()
+
+                if (thisChar != otherChar) {
+                    thisChar = thisChar.lowercaseChar()
+                    otherChar = otherChar.lowercaseChar()
+
+                    if (thisChar != otherChar) {
+                        return thisChar.compareTo(otherChar)
+                    }
+                }
+            }
+        }
+        return n1 - n2
+    } else {
+        return compareTo(other)
+    }
+}
+
+/**
+ * Returns `true` if the contents of this char sequence are equal to the contents of the specified [other],
+ * i.e. both char sequences contain the same number of the same characters in the same order.
+ *
+ * @sample samples.text.Strings.contentEquals
+ */
+@SinceKotlin("1.5")
+public actual infix fun CharSequence?.contentEquals(other: CharSequence?): Boolean = contentEqualsImpl(other)
+
+/**
+ * Returns `true` if the contents of this char sequence are equal to the contents of the specified [other], optionally ignoring case difference.
+ *
+ * @param ignoreCase `true` to ignore character case when comparing contents.
+ *
+ * @sample samples.text.Strings.contentEquals
+ */
+@SinceKotlin("1.5")
+public actual fun CharSequence?.contentEquals(other: CharSequence?, ignoreCase: Boolean): Boolean {
+    return if (ignoreCase)
+        this.contentEqualsIgnoreCaseImpl(other)
+    else
+        this.contentEqualsImpl(other)
+}
+
+/**
+ * Returns `true` if this string starts with the specified prefix.
+ */
+@Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
+public actual fun String.startsWith(prefix: String, ignoreCase: Boolean = false): Boolean =
+    regionMatches(0, prefix, 0, prefix.length, ignoreCase)
+
+/**
+ * Returns `true` if a substring of this string starting at the specified offset [startIndex] starts with the specified prefix.
+ */
+@Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
+public actual fun String.startsWith(prefix: String, startIndex: Int, ignoreCase: Boolean = false): Boolean =
+    regionMatches(startIndex, prefix, 0, prefix.length, ignoreCase)
+
+/**
+ * Returns `true` if this string ends with the specified suffix.
+ */
+@Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
+public actual fun String.endsWith(suffix: String, ignoreCase: Boolean = false): Boolean =
+    regionMatches(length - suffix.length, suffix, 0, suffix.length, ignoreCase)
+
+// From stringsCode.kt
+
+/**
+ * Returns `true` if this string is empty or consists solely of whitespace characters.
+ *
+ * @sample samples.text.Strings.stringIsBlank
+ */
+public actual fun CharSequence.isBlank(): Boolean = length == 0 || indices.all { this[it].isWhitespace() }
+
+/**
+ * Returns `true` if the specified range in this char sequence is equal to the specified range in another char sequence.
+ * @param thisOffset the start offset in this char sequence of the substring to compare.
+ * @param other the string against a substring of which the comparison is performed.
+ * @param otherOffset the start offset in the other char sequence of the substring to compare.
+ * @param length the length of the substring to compare.
+ */
+actual fun CharSequence.regionMatches(
+    thisOffset: Int,
+    other: CharSequence,
+    otherOffset: Int,
+    length: Int,
+    ignoreCase: Boolean
+): Boolean = regionMatchesImpl(thisOffset, other, otherOffset, length, ignoreCase)
+
+private val STRING_CASE_INSENSITIVE_ORDER = Comparator<String> { a, b -> a.compareTo(b, ignoreCase = true) }
+
+/**
+ * A Comparator that orders strings ignoring character case.
+ *
+ * Note that this Comparator does not take locale into account,
+ * and will result in an unsatisfactory ordering for certain locales.
+ */
+@SinceKotlin("1.2")
+public actual val String.Companion.CASE_INSENSITIVE_ORDER: Comparator<String>
+    get() = STRING_CASE_INSENSITIVE_ORDER

libraries/stdlib/wasm/src/kotlin/text/regex/BitSet.kt

@@ -0,0 +1,257 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+
+package kotlin.native
+
+/**
+ * A vector of bits growing if necessary and allowing one to set/clear/read bits from it by a bit index.
+ * (this is the stripped copy of K/N implementation for Regex)
+ *
+ * @constructor creates an empty bit set with the specified [size]
+ * @param size the size of one element in the array used to store bits.
+ */
+internal class BitSet constructor(size: Int = ELEMENT_SIZE) {
+
+    companion object {
+        // Default size of one element in the array used to store bits.
+        private const val ELEMENT_SIZE = 64
+        private const val MAX_BIT_OFFSET = ELEMENT_SIZE - 1
+        private const val ALL_TRUE = -1L // 0xFFFF_FFFF_FFFF_FFFF
+        private const val ALL_FALSE = 0L // 0x0000_0000_0000_0000
+    }
+
+    private var bits: LongArray = LongArray(bitToElementSize(size))
+
+    private val lastIndex: Int
+        get() = size - 1
+
+    /** True if this BitSet contains no bits set to true. */
+    val isEmpty: Boolean
+        get() = bits.all { it == ALL_FALSE }
+
+    /** Actual number of bits available in the set. All bits with indices >= size assumed to be 0 */
+    var size: Int = size
+        private set
+
+    // Transforms a bit index into an element index in the `bits` array.
+    private val Int.elementIndex: Int
+        get() = this / ELEMENT_SIZE
+
+    // Transforms a bit index in the set into a bit in the element of the `bits` array.
+    private val Int.bitOffset: Int
+        get() = this % ELEMENT_SIZE
+
+    // Transforms a bit index in the set into pair of a `bits` element index and a bit index in the element.
+    private val Int.asBitCoordinates: Pair<Int, Int>
+        get() = Pair(elementIndex, bitOffset)
+
+    // Transforms a bit offset to the mask with only bit set corresponding to the offset.
+    private val Int.asMask: Long
+        get() = 0x1L shl this
+
+    // Transforms a bit offset to the mask with only bits before the index (inclusive) set.
+    private val Int.asMaskBefore: Long
+        get() = getMaskBetween(0, this)
+
+    // Transforms a bit offset to the mask with only bits after the index (inclusive) set.
+    private val Int.asMaskAfter: Long
+        get() = getMaskBetween(this, MAX_BIT_OFFSET)
+
+    // Builds a masks with 1 between fromOffset and toOffset (both inclusive).
+    private fun getMaskBetween(fromOffset: Int, toOffset: Int): Long {
+        var res = 0L
+        val maskToAdd = fromOffset.asMask
+        for (i in fromOffset..toOffset) {
+            res = (res shl 1) or maskToAdd
+        }
+        return res
+    }
+
+    // Transforms a size in bits to a size in elements of the `bits` array.
+    private fun bitToElementSize(bitSize: Int): Int = (bitSize + ELEMENT_SIZE - 1) / ELEMENT_SIZE
+
+    // Transforms a pair of an element index and a bit offset to a bit index.
+    private fun bitIndex(elementIndex: Int, bitOffset: Int) =
+        elementIndex * ELEMENT_SIZE + bitOffset
+
+    // Sets all bits after the last available bit (size - 1) to 0.
+    private fun clearUnusedTail() {
+        val (lastElementIndex, lastBitOffset) = lastIndex.asBitCoordinates
+        bits[bits.lastIndex] = bits[bits.lastIndex] and lastBitOffset.asMaskBefore
+        for (i in lastElementIndex + 1 until bits.size) {
+            bits[i] = ALL_FALSE
+        }
+    }
+
+    // Internal function. Sets bits specified by the element index and the given mask to value.
+    private fun setBitsWithMask(elementIndex: Int, mask: Long, value: Boolean) {
+        val element = bits[elementIndex]
+        if (value) {
+            bits[elementIndex] = element or mask
+        } else {
+            bits[elementIndex] = element and mask.inv()
+        }
+    }
+
+    /**
+     * Checks if index is valid and extends the `bits` array if the index exceeds its size.
+     * @throws [IndexOutOfBoundsException] if [index] < 0.
+     */
+    private fun ensureCapacity(index: Int) {
+        if (index < 0) {
+            throw IndexOutOfBoundsException()
+        }
+        if (index >= size) {
+            size = index + 1
+            if (index.elementIndex >= bits.size) {
+                // Create a new array containing the index-th bit.
+                bits = bits.copyOf(bitToElementSize(index + 1))
+            }
+            // Set all bits after the index to 0. TODO: We can remove it.
+            clearUnusedTail()
+        }
+    }
+
+    /** Set the bit specified to the specified value. */
+    fun set(index: Int, value: Boolean = true) {
+        ensureCapacity(index)
+        val (elementIndex, offset) = index.asBitCoordinates
+        setBitsWithMask(elementIndex, offset.asMask, value)
+    }
+
+    /** Sets the bits with indices between [from] (inclusive) and [to] (exclusive) to the specified value. */
+    fun set(from : Int, to: Int, value: Boolean = true) = set(from until to, value)
+
+    /** Sets the bits from the range specified to the specified value. */
+    fun set(range: IntRange, value: Boolean = true) {
+        if (range.start < 0 || range.endInclusive < 0) {
+            throw IndexOutOfBoundsException()
+        }
+        if (range.start > range.endInclusive) { // Empty range.
+            return
+        }
+        ensureCapacity(range.endInclusive)
+        val (fromIndex, fromOffset) = range.start.asBitCoordinates
+        val (toIndex, toOffset) = range.endInclusive.asBitCoordinates
+        if (toIndex == fromIndex) {
+            val mask = getMaskBetween(fromOffset, toOffset)
+            setBitsWithMask(fromIndex, mask, value)
+        } else {
+            // Set bits in the first element.
+            setBitsWithMask(fromIndex, fromOffset.asMaskAfter, value)
+            // Set all bits of all elements (excluding border ones) to 0 or 1 depending.
+            for (index in fromIndex + 1 until toIndex) {
+                bits[index] = if (value) ALL_TRUE else ALL_FALSE
+            }
+            // Set bits in the last element
+            setBitsWithMask(toIndex, toOffset.asMaskBefore, value)
+        }
+    }
+
+
+    /**
+     * Returns an index of a next set (if [lookFor] == true) or clear
+     * (if [lookFor] == false) bit after [startIndex] (inclusive).
+     * Returns -1 (for [lookFor] == true) or [size] (for lookFor == false)
+     * if there is no such bits between [startIndex] and [size] - 1.
+     * @throws IndexOutOfBoundException if [startIndex] < 0.
+     */
+    private fun nextBit(startIndex: Int, lookFor: Boolean): Int {
+        if (startIndex < 0) {
+            throw IndexOutOfBoundsException()
+        }
+        if (startIndex >= size) {
+            return if (lookFor) -1 else startIndex
+        }
+        val (startElementIndex, startOffset) = startIndex.asBitCoordinates
+        // Look for the next set bit in the first element.
+        var element = bits[startElementIndex]
+        for (offset in startOffset..MAX_BIT_OFFSET) {
+            val bit = element and (0x1L shl offset) != 0L
+            if (bit == lookFor) {  // Look for not 0 if we need a set bit and look for 0 otherwise.
+                return bitIndex(startElementIndex, offset)
+            }
+        }
+        // Look for in the remaining elements.
+        for (index in startElementIndex + 1..bits.lastIndex) {
+            element = bits[index]
+            for (offset in 0..MAX_BIT_OFFSET) {
+                val bit = element and (0x1L shl offset) != 0L
+                if (bit == lookFor) { // Look for not 0 if we need a set bit and look for 0 otherwise.
+                    return bitIndex(index, offset)
+                }
+            }
+        }
+        return if (lookFor) -1 else size
+    }
+
+    /**
+     * Returns an index of a next bit which value is `true` after [startIndex] (inclusive).
+     * Returns -1 if there is no such bits after [startIndex].
+     * @throws IndexOutOfBoundException if [startIndex] < 0.
+     */
+    fun nextSetBit(startIndex: Int = 0): Int = nextBit(startIndex, true)
+
+    /**
+     * Returns an index of a next bit which value is `false` after [startIndex] (inclusive).
+     * Returns [size] if there is no such bits between [startIndex] and [size] - 1 assuming that the set has an infinite
+     * sequence of `false` bits after (size - 1)-th.
+     * @throws IndexOutOfBoundException if [startIndex] < 0.
+     */
+    fun nextClearBit(startIndex: Int = 0): Int = nextBit(startIndex, false)
+
+    /** Returns a value of a bit with the [index] specified. */
+    operator fun get(index: Int): Boolean {
+        if (index < 0) {
+            throw IndexOutOfBoundsException()
+        }
+        if (index >= size) {
+            return false
+        }
+        val (elementIndex, offset) = index.asBitCoordinates
+        return bits[elementIndex] and offset.asMask != 0L
+    }
+
+    private inline fun doOperation(another: BitSet, operation: Long.(Long) -> Long) {
+        ensureCapacity(another.lastIndex)
+        var index = 0
+        while (index < another.bits.size) {
+            bits[index] = operation(bits[index], another.bits[index])
+            index++
+        }
+        while (index < bits.size) {
+            bits[index] = operation(bits[index], ALL_FALSE)
+            index++
+        }
+    }
+
+    /** Performs a logical and operation over corresponding bits of this and [another] BitSets. The result is saved in this BitSet. */
+    fun and(another: BitSet) = doOperation(another, Long::and)
+
+    /** Performs a logical or operation over corresponding bits of this and [another] BitSets. The result is saved in this BitSet. */
+    fun or(another: BitSet) = doOperation(another, Long::or)
+
+    /** Performs a logical xor operation over corresponding bits of this and [another] BitSets. The result is saved in this BitSet. */
+    fun xor(another: BitSet) = doOperation(another, Long::xor)
+
+    /** Performs a logical and + not operations over corresponding bits of this and [another] BitSets. The result is saved in this BitSet. */
+    fun andNot(another: BitSet) {
+        ensureCapacity(another.lastIndex)
+        var index = 0
+        while (index < another.bits.size) {
+            bits[index] = bits[index] and another.bits[index].inv()
+            index++
+        }
+        while (index < bits.size) {
+            bits[index] = bits[index] and ALL_TRUE
+            index++
+        }
+    }
+
+    /** Returns true if the specified BitSet has any bits set to true that are also set to true in this BitSet. */
+    fun intersects(another: BitSet): Boolean =
+        (0 until minOf(bits.size, another.bits.size)).any { bits[it] and another.bits[it] != 0L }
+}

libraries/stdlib/wasm/src/kotlin/text/regex/DecompositionHelpers.kt

@@ -0,0 +1,318 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package kotlin.text.regex
+
+/* Contains canonical classes (see http://www.unicode.org/Public/4.0-Update/UnicodeData-4.0.0.txt). */
+private val canonicalClassesKeys = intArrayOf(
+    768, 769, 770, 771, 772, 773, 774, 775, 776, 777, 778, 779, 780, 781, 782, 783, 784, 785, 786, 787, 788, 789, 790,
+    791, 792, 793, 794, 795, 796, 797, 798, 799, 800, 801, 802, 803, 804, 805, 806, 807, 808, 809, 810, 811, 812, 813,
+    814, 815, 816, 817, 818, 819, 820, 821, 822, 823, 824, 825, 826, 827, 828, 829, 830, 831, 832, 833, 834, 835, 836,
+    837, 838, 839, 840, 841, 842, 843, 844, 845, 846, 848, 849, 850, 851, 852, 853, 854, 855, 856, 857, 858, 859, 860,
+    861, 862, 863, 864, 865, 866, 867, 868, 869, 870, 871, 872, 873, 874, 875, 876, 877, 878, 879, 1155, 1156, 1157, 1158,
+    1425, 1426, 1427, 1428, 1429, 1430, 1431, 1432, 1433, 1434, 1435, 1436, 1437, 1438, 1439, 1440, 1441, 1442, 1443,
+    1444, 1445, 1446, 1447, 1448, 1449, 1450, 1451, 1452, 1453, 1454, 1455, 1456, 1457, 1458, 1459, 1460, 1461, 1462,
+    1463, 1464, 1465, 1467, 1468, 1469, 1471, 1473, 1474, 1476, 1477, 1479, 1552, 1553, 1554, 1555, 1556, 1557, 1611,
+    1612, 1613, 1614, 1615, 1616, 1617, 1618, 1619, 1620, 1621, 1622, 1623, 1624, 1625, 1626, 1627, 1628, 1629, 1630,
+    1648, 1750, 1751, 1752, 1753, 1754, 1755, 1756, 1759, 1760, 1761, 1762, 1763, 1764, 1767, 1768, 1770, 1771, 1772,
+    1773, 1809, 1840, 1841, 1842, 1843, 1844, 1845, 1846, 1847, 1848, 1849, 1850, 1851, 1852, 1853, 1854, 1855, 1856,
+    1857, 1858, 1859, 1860, 1861, 1862, 1863, 1864, 1865, 1866, 2364, 2381, 2385, 2386, 2387, 2388, 2492, 2509, 2620,
+    2637, 2748, 2765, 2876, 2893, 3021, 3149, 3157, 3158, 3260, 3277, 3405, 3530, 3640, 3641, 3642, 3656, 3657, 3658,
+    3659, 3768, 3769, 3784, 3785, 3786, 3787, 3864, 3865, 3893, 3895, 3897, 3953, 3954, 3956, 3962, 3963, 3964, 3965,
+    3968, 3970, 3971, 3972, 3974, 3975, 4038, 4151, 4153, 4959, 5908, 5940, 6098, 6109, 6313, 6457, 6458, 6459, 6679,
+    6680, 7616, 7617, 7618, 7619, 8400, 8401, 8402, 8403, 8404, 8405, 8406, 8407, 8408, 8409, 8410, 8411, 8412, 8417,
+    8421, 8422, 8423, 8424, 8425, 8426, 8427, 12330, 12331, 12332, 12333, 12334, 12335, 12441, 12442, 43014, 64286, 65056,
+    65057, 65058, 65059, 68109, 68111, 68152, 68153, 68154, 68159, 119141, 119142, 119143, 119144, 119145, 119149, 119150,
+    119151, 119152, 119153, 119154, 119163, 119164, 119165, 119166, 119167, 119168, 119169, 119170, 119173, 119174,
+    119175, 119176, 119177, 119178, 119179, 119210, 119211, 119212, 119213, 119362, 119363, 119364,
+)
+
+private val canonicalClassesValues = intArrayOf(
+    230, 230, 230, 230, 230, 230, 230, 230, 230, 230, 230, 230, 230, 230, 230, 230, 230, 230, 230, 230, 230, 232, 220,
+    220, 220, 220, 232, 216, 220, 220, 220, 220, 220, 202, 202, 220, 220, 220, 220, 202, 202, 220, 220, 220, 220, 220,
+    220, 220, 220, 220, 220, 220, 1, 1, 1, 1, 1, 220, 220, 220, 220, 230, 230, 230, 230, 230, 230, 230, 230, 240, 230,
+    220, 220, 220, 230, 230, 230, 220, 220, 230, 230, 230, 220, 220, 220, 220, 230, 232, 220, 220, 230, 233, 234, 234,
+    233, 234, 234, 233, 230, 230, 230, 230, 230, 230, 230, 230, 230, 230, 230, 230, 230, 230, 230, 230, 230, 220, 230,
+    230, 230, 230, 220, 230, 230, 230, 222, 220, 230, 230, 230, 230, 230, 230, 220, 220, 220, 220, 220, 220, 230, 230,
+    220, 230, 230, 222, 228, 230, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 230, 220, 18, 230, 230,
+    230, 230, 230, 230, 27, 28, 29, 30, 31, 32, 33, 34, 230, 230, 220, 220, 230, 230, 230, 230, 230, 220, 230, 230, 35,
+    230, 230, 230, 230, 230, 230, 230, 230, 230, 230, 230, 220, 230, 230, 230, 220, 230, 230, 220, 36, 230, 220, 230, 230,
+    220, 230, 230, 220, 220, 220, 230, 220, 220, 230, 220, 230, 230, 230, 220, 230, 220, 230, 220, 230, 220, 230, 230, 7,
+    9, 230, 220, 230, 230, 7, 9, 7, 9, 7, 9, 7, 9, 9, 9, 84, 91, 7, 9, 9, 9, 103, 103, 9, 107, 107, 107, 107, 118, 118,
+    122, 122, 122, 122, 220, 220, 220, 220, 216, 129, 130, 132, 130, 130, 130, 130, 130, 230, 230, 9, 230, 230, 220, 7, 9,
+    230, 9, 9, 9, 230, 228, 222, 230, 220, 230, 220, 230, 230, 220, 230, 230, 230, 1, 1, 230, 230, 230, 230, 1, 1, 1, 230,
+    230, 230, 1, 1, 230, 220, 230, 1, 1, 218, 228, 232, 222, 224, 224, 8, 8, 9, 26, 230, 230, 230, 230, 220, 230, 230, 1,
+    220, 9, 216, 216, 1, 1, 1, 226, 216, 216, 216, 216, 216, 220, 220, 220, 220, 220, 220, 220, 220, 230, 230, 230, 230,
+    230, 220, 220, 230, 230, 230, 230, 230, 230, 230,
+)
+
+/* Symbols that are one symbol decompositions (see http://www.unicode.org/Public/4.0-Update/UnicodeData-4.0.0.txt). */
+private val singleDecompositions = intArrayOf(
+    59, 75, 96, 180, 183, 197, 697, 768, 769, 787, 901, 902, 904, 905, 906, 908, 910, 911, 912, 937, 940, 941, 942, 943,
+    944, 953, 972, 973, 974, 8194, 8195, 12296, 12297, 13470, 13497, 13499, 13535, 13589, 14062, 14076, 14209, 14383,
+    14434, 14460, 14535, 14563, 14620, 14650, 14894, 14956, 15076, 15112, 15129, 15177, 15261, 15384, 15438, 15667, 15766,
+    16044, 16056, 16155, 16380, 16392, 16408, 16441, 16454, 16534, 16611, 16687, 16898, 16935, 17056, 17153, 17204, 17241,
+    17365, 17369, 17419, 17515, 17707, 17757, 17761, 17771, 17879, 17913, 17973, 18110, 18119, 18837, 18918, 19054, 19062,
+    19122, 19251, 19406, 19662, 19693, 19704, 19798, 19981, 20006, 20018, 20024, 20025, 20029, 20033, 20098, 20102, 20142,
+    20160, 20172, 20196, 20320, 20352, 20358, 20363, 20398, 20411, 20415, 20482, 20523, 20602, 20633, 20687, 20698, 20711,
+    20800, 20805, 20813, 20820, 20836, 20839, 20840, 20841, 20845, 20855, 20864, 20877, 20882, 20885, 20887, 20900, 20908,
+    20917, 20919, 20937, 20940, 20956, 20958, 20981, 20995, 20999, 21015, 21033, 21050, 21051, 21062, 21106, 21111, 21129,
+    21147, 21155, 21171, 21191, 21193, 21202, 21214, 21220, 21237, 21242, 21253, 21254, 21271, 21311, 21321, 21329, 21338,
+    21363, 21365, 21373, 21375, 21443, 21450, 21471, 21477, 21483, 21489, 21510, 21519, 21533, 21560, 21570, 21576, 21608,
+    21662, 21666, 21693, 21750, 21776, 21843, 21845, 21859, 21892, 21895, 21913, 21917, 21931, 21939, 21952, 21954, 21986,
+    22022, 22097, 22120, 22132, 22265, 22294, 22295, 22411, 22478, 22516, 22541, 22577, 22578, 22592, 22618, 22622, 22696,
+    22700, 22707, 22744, 22751, 22766, 22770, 22775, 22790, 22810, 22818, 22852, 22856, 22865, 22868, 22882, 22899, 23000,
+    23020, 23067, 23079, 23138, 23142, 23221, 23304, 23336, 23358, 23429, 23491, 23512, 23527, 23534, 23539, 23551, 23558,
+    23586, 23615, 23648, 23650, 23652, 23653, 23662, 23693, 23744, 23833, 23875, 23888, 23915, 23918, 23932, 23986, 23994,
+    24033, 24034, 24061, 24104, 24125, 24169, 24180, 24230, 24240, 24243, 24246, 24265, 24266, 24274, 24275, 24281, 24300,
+    24318, 24324, 24354, 24403, 24418, 24425, 24427, 24459, 24474, 24489, 24493, 24525, 24535, 24565, 24569, 24594, 24604,
+    24705, 24724, 24775, 24792, 24801, 24840, 24900, 24904, 24908, 24910, 24928, 24936, 24954, 24974, 24976, 24996, 25007,
+    25010, 25054, 25074, 25078, 25088, 25104, 25115, 25134, 25140, 25181, 25265, 25289, 25295, 25299, 25300, 25340, 25342,
+    25405, 25424, 25448, 25467, 25475, 25504, 25513, 25540, 25541, 25572, 25628, 25634, 25682, 25705, 25719, 25726, 25754,
+    25757, 25796, 25935, 25942, 25964, 25976, 26009, 26053, 26082, 26083, 26131, 26185, 26228, 26248, 26257, 26268, 26292,
+    26310, 26356, 26360, 26368, 26391, 26395, 26401, 26446, 26451, 26454, 26462, 26491, 26501, 26519, 26611, 26618, 26647,
+    26655, 26706, 26753, 26757, 26766, 26792, 26900, 26946, 27043, 27114, 27138, 27155, 27304, 27347, 27355, 27396, 27425,
+    27476, 27506, 27511, 27513, 27551, 27566, 27578, 27579, 27726, 27751, 27784, 27839, 27852, 27853, 27877, 27926, 27931,
+    27934, 27956, 27966, 27969, 28009, 28010, 28023, 28024, 28037, 28107, 28122, 28138, 28153, 28186, 28207, 28270, 28316,
+    28346, 28359, 28363, 28369, 28379, 28431, 28450, 28451, 28526, 28614, 28651, 28670, 28699, 28702, 28729, 28746, 28784,
+    28791, 28797, 28825, 28845, 28872, 28889, 28997, 29001, 29038, 29084, 29134, 29136, 29200, 29211, 29224, 29227, 29237,
+    29264, 29282, 29312, 29333, 29359, 29376, 29436, 29482, 29557, 29562, 29575, 29579, 29605, 29618, 29662, 29702, 29705,
+    29730, 29767, 29788, 29801, 29809, 29829, 29833, 29848, 29898, 29958, 29988, 30011, 30014, 30041, 30053, 30064, 30178,
+    30224, 30237, 30239, 30274, 30313, 30410, 30427, 30439, 30452, 30465, 30494, 30495, 30528, 30538, 30603, 30631, 30798,
+    30827, 30860, 30865, 30922, 30924, 30971, 31018, 31036, 31038, 31048, 31049, 31056, 31062, 31069, 31070, 31077, 31103,
+    31117, 31118, 31119, 31150, 31178, 31211, 31260, 31296, 31306, 31311, 31361, 31409, 31435, 31470, 31520, 31680, 31686,
+    31689, 31806, 31840, 31867, 31890, 31934, 31954, 31958, 31971, 31975, 31976, 32000, 32016, 32034, 32047, 32091, 32099,
+    32160, 32190, 32199, 32244, 32258, 32265, 32311, 32321, 32325, 32574, 32626, 32633, 32634, 32645, 32661, 32666, 32701,
+    32762, 32769, 32773, 32838, 32864, 32879, 32880, 32894, 32907, 32941, 32946, 33027, 33086, 33240, 33256, 33261, 33281,
+    33284, 33391, 33401, 33419, 33425, 33437, 33457, 33459, 33469, 33509, 33510, 33565, 33571, 33590, 33618, 33619, 33635,
+    33709, 33725, 33737, 33738, 33740, 33756, 33767, 33775, 33777, 33853, 33865, 33879, 34030, 34033, 34035, 34044, 34070,
+    34148, 34253, 34298, 34310, 34322, 34349, 34367, 34384, 34396, 34407, 34409, 34440, 34473, 34530, 34574, 34600, 34667,
+    34681, 34694, 34746, 34785, 34817, 34847, 34892, 34912, 34915, 35010, 35023, 35031, 35038, 35041, 35064, 35066, 35088,
+    35137, 35172, 35206, 35211, 35222, 35488, 35498, 35519, 35531, 35538, 35542, 35565, 35576, 35582, 35585, 35641, 35672,
+    35712, 35722, 35912, 35925, 36011, 36033, 36034, 36040, 36051, 36104, 36123, 36215, 36284, 36299, 36335, 36336, 36554,
+    36564, 36646, 36650, 36664, 36667, 36706, 36766, 36784, 36790, 36899, 36920, 36978, 36988, 37007, 37012, 37070, 37105,
+    37117, 37137, 37147, 37226, 37273, 37300, 37324, 37327, 37329, 37428, 37432, 37494, 37500, 37591, 37592, 37636, 37706,
+    37881, 37909, 38283, 38317, 38327, 38446, 38475, 38477, 38517, 38520, 38524, 38534, 38563, 38584, 38595, 38626, 38627,
+    38646, 38647, 38691, 38706, 38728, 38742, 38875, 38880, 38911, 38923, 38936, 38953, 38971, 39006, 39138, 39151, 39164,
+    39208, 39209, 39335, 39362, 39409, 39422, 39530, 39698, 39791, 40000, 40023, 40189, 40295, 40372, 40442, 40478, 40575,
+    40599, 40607, 40635, 40654, 40697, 40702, 40709, 40719, 40726, 40763, 40771, 40845, 40846, 40860, 131362, 132380,
+    132389, 132427, 132666, 133124, 133342, 133676, 133987, 136420, 136872, 136938, 137672, 138008, 138507, 138724,
+    138726, 139651, 139679, 140081, 141012, 141380, 141386, 142092, 142321, 143370, 144056, 144223, 144275, 144284,
+    144323, 144341, 144493, 145059, 145575, 146061, 146170, 146620, 146718, 147153, 147294, 147342, 148067, 148395,
+    149000, 149301, 149524, 150582, 150674, 151457, 151480, 151620, 151794, 151795, 151833, 151859, 152137, 152605,
+    153126, 153242, 153285, 153980, 154279, 154539, 154752, 154832, 155526, 156122, 156200, 156231, 156377, 156478,
+    156890, 156963, 157096, 157607, 157621, 158524, 158774, 158933, 159083, 159532, 159665, 159954, 160714, 161383,
+    161966, 162150, 162984, 163539, 163631, 165330, 165357, 165678, 166906, 167287, 168261, 168415, 168474, 168970,
+    169110, 169398, 170800, 172238, 172293, 172558, 172689, 172946, 173568
+)
+
+private val decompositionKeys = intArrayOf(
+    192, 193, 194, 195, 196, 197, 199, 200, 201, 202, 203, 204, 205, 206, 207, 209, 210, 211, 212, 213, 214, 217, 218,
+    219, 220, 221, 224, 225, 226, 227, 228, 229, 231, 232, 233, 234, 235, 236, 237, 238, 239, 241, 242, 243, 244, 245,
+    246, 249, 250, 251, 252, 253, 255, 256, 257, 258, 259, 260, 261, 262, 263, 264, 265, 266, 267, 268, 269, 270, 271,
+    274, 275, 276, 277, 278, 279, 280, 281, 282, 283, 284, 285, 286, 287, 288, 289, 290, 291, 292, 293, 296, 297, 298,
+    299, 300, 301, 302, 303, 304, 308, 309, 310, 311, 313, 314, 315, 316, 317, 318, 323, 324, 325, 326, 327, 328, 332,
+    333, 334, 335, 336, 337, 340, 341, 342, 343, 344, 345, 346, 347, 348, 349, 350, 351, 352, 353, 354, 355, 356, 357,
+    360, 361, 362, 363, 364, 365, 366, 367, 368, 369, 370, 371, 372, 373, 374, 375, 376, 377, 378, 379, 380, 381, 382,
+    416, 417, 431, 432, 461, 462, 463, 464, 465, 466, 467, 468, 469, 470, 471, 472, 473, 474, 475, 476, 478, 479, 480,
+    481, 482, 483, 486, 487, 488, 489, 490, 491, 492, 493, 494, 495, 496, 500, 501, 504, 505, 506, 507, 508, 509, 510,
+    511, 512, 513, 514, 515, 516, 517, 518, 519, 520, 521, 522, 523, 524, 525, 526, 527, 528, 529, 530, 531, 532, 533,
+    534, 535, 536, 537, 538, 539, 542, 543, 550, 551, 552, 553, 554, 555, 556, 557, 558, 559, 560, 561, 562, 563, 832,
+    833, 835, 836, 884, 894, 901, 902, 903, 904, 905, 906, 908, 910, 911, 912, 938, 939, 940, 941, 942, 943, 944, 970,
+    971, 972, 973, 974, 979, 980, 1024, 1025, 1027, 1031, 1036, 1037, 1038, 1049, 1081, 1104, 1105, 1107, 1111, 1116,
+    1117, 1118, 1142, 1143, 1217, 1218, 1232, 1233, 1234, 1235, 1238, 1239, 1242, 1243, 1244, 1245, 1246, 1247, 1250,
+    1251, 1252, 1253, 1254, 1255, 1258, 1259, 1260, 1261, 1262, 1263, 1264, 1265, 1266, 1267, 1268, 1269, 1272, 1273,
+    1570, 1571, 1572, 1573, 1574, 1728, 1730, 1747, 2345, 2353, 2356, 2392, 2393, 2394, 2395, 2396, 2397, 2398, 2399,
+    2507, 2508, 2524, 2525, 2527, 2611, 2614, 2649, 2650, 2651, 2654, 2888, 2891, 2892, 2908, 2909, 2964, 3018, 3019,
+    3020, 3144, 3264, 3271, 3272, 3274, 3275, 3402, 3403, 3404, 3546, 3548, 3549, 3550, 3907, 3917, 3922, 3927, 3932,
+    3945, 3955, 3957, 3958, 3960, 3969, 3987, 3997, 4002, 4007, 4012, 4025, 4134, 7680, 7681, 7682, 7683, 7684, 7685,
+    7686, 7687, 7688, 7689, 7690, 7691, 7692, 7693, 7694, 7695, 7696, 7697, 7698, 7699, 7700, 7701, 7702, 7703, 7704,
+    7705, 7706, 7707, 7708, 7709, 7710, 7711, 7712, 7713, 7714, 7715, 7716, 7717, 7718, 7719, 7720, 7721, 7722, 7723,
+    7724, 7725, 7726, 7727, 7728, 7729, 7730, 7731, 7732, 7733, 7734, 7735, 7736, 7737, 7738, 7739, 7740, 7741, 7742,
+    7743, 7744, 7745, 7746, 7747, 7748, 7749, 7750, 7751, 7752, 7753, 7754, 7755, 7756, 7757, 7758, 7759, 7760, 7761,
+    7762, 7763, 7764, 7765, 7766, 7767, 7768, 7769, 7770, 7771, 7772, 7773, 7774, 7775, 7776, 7777, 7778, 7779, 7780,
+    7781, 7782, 7783, 7784, 7785, 7786, 7787, 7788, 7789, 7790, 7791, 7792, 7793, 7794, 7795, 7796, 7797, 7798, 7799,
+    7800, 7801, 7802, 7803, 7804, 7805, 7806, 7807, 7808, 7809, 7810, 7811, 7812, 7813, 7814, 7815, 7816, 7817, 7818,
+    7819, 7820, 7821, 7822, 7823, 7824, 7825, 7826, 7827, 7828, 7829, 7830, 7831, 7832, 7833, 7835, 7840, 7841, 7842,
+    7843, 7844, 7845, 7846, 7847, 7848, 7849, 7850, 7851, 7852, 7853, 7854, 7855, 7856, 7857, 7858, 7859, 7860, 7861,
+    7862, 7863, 7864, 7865, 7866, 7867, 7868, 7869, 7870, 7871, 7872, 7873, 7874, 7875, 7876, 7877, 7878, 7879, 7880,
+    7881, 7882, 7883, 7884, 7885, 7886, 7887, 7888, 7889, 7890, 7891, 7892, 7893, 7894, 7895, 7896, 7897, 7898, 7899,
+    7900, 7901, 7902, 7903, 7904, 7905, 7906, 7907, 7908, 7909, 7910, 7911, 7912, 7913, 7914, 7915, 7916, 7917, 7918,
+    7919, 7920, 7921, 7922, 7923, 7924, 7925, 7926, 7927, 7928, 7929, 7936, 7937, 7938, 7939, 7940, 7941, 7942, 7943,
+    7944, 7945, 7946, 7947, 7948, 7949, 7950, 7951, 7952, 7953, 7954, 7955, 7956, 7957, 7960, 7961, 7962, 7963, 7964,
+    7965, 7968, 7969, 7970, 7971, 7972, 7973, 7974, 7975, 7976, 7977, 7978, 7979, 7980, 7981, 7982, 7983, 7984, 7985,
+    7986, 7987, 7988, 7989, 7990, 7991, 7992, 7993, 7994, 7995, 7996, 7997, 7998, 7999, 8000, 8001, 8002, 8003, 8004,
+    8005, 8008, 8009, 8010, 8011, 8012, 8013, 8016, 8017, 8018, 8019, 8020, 8021, 8022, 8023, 8025, 8027, 8029, 8031,
+    8032, 8033, 8034, 8035, 8036, 8037, 8038, 8039, 8040, 8041, 8042, 8043, 8044, 8045, 8046, 8047, 8048, 8049, 8050,
+    8051, 8052, 8053, 8054, 8055, 8056, 8057, 8058, 8059, 8060, 8061, 8064, 8065, 8066, 8067, 8068, 8069, 8070, 8071,
+    8072, 8073, 8074, 8075, 8076, 8077, 8078, 8079, 8080, 8081, 8082, 8083, 8084, 8085, 8086, 8087, 8088, 8089, 8090,
+    8091, 8092, 8093, 8094, 8095, 8096, 8097, 8098, 8099, 8100, 8101, 8102, 8103, 8104, 8105, 8106, 8107, 8108, 8109,
+    8110, 8111, 8112, 8113, 8114, 8115, 8116, 8118, 8119, 8120, 8121, 8122, 8123, 8124, 8126, 8129, 8130, 8131, 8132,
+    8134, 8135, 8136, 8137, 8138, 8139, 8140, 8141, 8142, 8143, 8144, 8145, 8146, 8147, 8150, 8151, 8152, 8153, 8154,
+    8155, 8157, 8158, 8159, 8160, 8161, 8162, 8163, 8164, 8165, 8166, 8167, 8168, 8169, 8170, 8171, 8172, 8173, 8174,
+    8175, 8178, 8179, 8180, 8182, 8183, 8184, 8185, 8186, 8187, 8188, 8189, 8192, 8193, 8486, 8490, 8491, 8602, 8603,
+    8622, 8653, 8654, 8655, 8708, 8713, 8716, 8740, 8742, 8769, 8772, 8775, 8777, 8800, 8802, 8813, 8814, 8815, 8816,
+    8817, 8820, 8821, 8824, 8825, 8832, 8833, 8836, 8837, 8840, 8841, 8876, 8877, 8878, 8879, 8928, 8929, 8930, 8931,
+    8938, 8939, 8940, 8941, 9001, 9002, 10972, 12364, 12366, 12368, 12370, 12372, 12374, 12376, 12378, 12380, 12382,
+    12384, 12386, 12389, 12391, 12393, 12400, 12401, 12403, 12404, 12406, 12407, 12409, 12410, 12412, 12413, 12436, 12446,
+    12460, 12462, 12464, 12466, 12468, 12470, 12472, 12474, 12476, 12478, 12480, 12482, 12485, 12487, 12489, 12496, 12497,
+    12499, 12500, 12502, 12503, 12505, 12506, 12508, 12509, 12532, 12535, 12536, 12537, 12538, 12542, 63744, 63745, 63746,
+    63747, 63748, 63749, 63750, 63751, 63752, 63753, 63754, 63755, 63756, 63757, 63758, 63759, 63760, 63761, 63762, 63763,
+    63764, 63765, 63766, 63767, 63768, 63769, 63770, 63771, 63772, 63773, 63774, 63775, 63776, 63777, 63778, 63779, 63780,
+    63781, 63782, 63783, 63784, 63785, 63786, 63787, 63788, 63789, 63790, 63791, 63792, 63793, 63794, 63795, 63796, 63797,
+    63798, 63799, 63800, 63801, 63802, 63803, 63804, 63805, 63806, 63807, 63808, 63809, 63810, 63811, 63812, 63813, 63814,
+    63815, 63816, 63817, 63818, 63819, 63820, 63821, 63822, 63823, 63824, 63825, 63826, 63827, 63828, 63829, 63830, 63831,
+    63832, 63833, 63834, 63835, 63836, 63837, 63838, 63839, 63840, 63841, 63842, 63843, 63844, 63845, 63846, 63847, 63848,
+    63849, 63850, 63851, 63852, 63853, 63854, 63855, 63856, 63857, 63858, 63859, 63860, 63861, 63862, 63863, 63864, 63865,
+    63866, 63867, 63868, 63869, 63870, 63871, 63872, 63873, 63874, 63875, 63876, 63877, 63878, 63879, 63880, 63881, 63882,
+    63883, 63884, 63885, 63886, 63887, 63888, 63889, 63890, 63891, 63892, 63893, 63894, 63895, 63896, 63897, 63898, 63899,
+    63900, 63901, 63902, 63903, 63904, 63905, 63906, 63907, 63908, 63909, 63910, 63911, 63912, 63913, 63914, 63915, 63916,
+    63917, 63918, 63919, 63920, 63921, 63922, 63923, 63924, 63925, 63926, 63927, 63928, 63929, 63930, 63931, 63932, 63933,
+    63934, 63935, 63936, 63937, 63938, 63939, 63940, 63941, 63942, 63943, 63944, 63945, 63946, 63947, 63948, 63949, 63950,
+    63951, 63952, 63953, 63954, 63955, 63956, 63957, 63958, 63959, 63960, 63961, 63962, 63963, 63964, 63965, 63966, 63967,
+    63968, 63969, 63970, 63971, 63972, 63973, 63974, 63975, 63976, 63977, 63978, 63979, 63980, 63981, 63982, 63983, 63984,
+    63985, 63986, 63987, 63988, 63989, 63990, 63991, 63992, 63993, 63994, 63995, 63996, 63997, 63998, 63999, 64000, 64001,
+    64002, 64003, 64004, 64005, 64006, 64007, 64008, 64009, 64010, 64011, 64012, 64013, 64016, 64018, 64021, 64022, 64023,
+    64024, 64025, 64026, 64027, 64028, 64029, 64030, 64032, 64034, 64037, 64038, 64042, 64043, 64044, 64045, 64048, 64049,
+    64050, 64051, 64052, 64053, 64054, 64055, 64056, 64057, 64058, 64059, 64060, 64061, 64062, 64063, 64064, 64065, 64066,
+    64067, 64068, 64069, 64070, 64071, 64072, 64073, 64074, 64075, 64076, 64077, 64078, 64079, 64080, 64081, 64082, 64083,
+    64084, 64085, 64086, 64087, 64088, 64089, 64090, 64091, 64092, 64093, 64094, 64095, 64096, 64097, 64098, 64099, 64100,
+    64101, 64102, 64103, 64104, 64105, 64106, 64112, 64113, 64114, 64115, 64116, 64117, 64118, 64119, 64120, 64121, 64122,
+    64123, 64124, 64125, 64126, 64127, 64128, 64129, 64130, 64131, 64132, 64133, 64134, 64135, 64136, 64137, 64138, 64139,
+    64140, 64141, 64142, 64143, 64144, 64145, 64146, 64147, 64148, 64149, 64150, 64151, 64152, 64153, 64154, 64155, 64156,
+    64157, 64158, 64159, 64160, 64161, 64162, 64163, 64164, 64165, 64166, 64167, 64168, 64169, 64170, 64171, 64172, 64173,
+    64174, 64175, 64176, 64177, 64178, 64179, 64180, 64181, 64182, 64183, 64184, 64185, 64186, 64187, 64188, 64189, 64190,
+    64191, 64192, 64193, 64194, 64195, 64196, 64197, 64198, 64199, 64200, 64201, 64202, 64203, 64204, 64205, 64206, 64207,
+    64208, 64209, 64210, 64211, 64212, 64213, 64214, 64215, 64216, 64217, 64285, 64287, 64298, 64299, 64300, 64301, 64302,
+    64303, 64304, 64305, 64306, 64307, 64308, 64309, 64310, 64312, 64313, 64314, 64315, 64316, 64318, 64320, 64321, 64323,
+    64324, 64326, 64327, 64328, 64329, 64330, 64331, 64332, 64333, 64334, 119134, 119135, 119136, 119137, 119138, 119139,
+    119140, 119227, 119228, 119229, 119230, 119231, 119232, 194560, 194561, 194562, 194563, 194564, 194565, 194566,
+    194567, 194568, 194569, 194570, 194571, 194572, 194573, 194574, 194575, 194576, 194577, 194578, 194579, 194580,
+    194581, 194582, 194583, 194584, 194585, 194586, 194587, 194588, 194589, 194590, 194591, 194592, 194593, 194594,
+    194595, 194596, 194597, 194598, 194599, 194600, 194601, 194602, 194603, 194604, 194605, 194606, 194607, 194608,
+    194609, 194610, 194611, 194612, 194613, 194614, 194615, 194616, 194617, 194618, 194619, 194620, 194621, 194622,
+    194623, 194624, 194625, 194626, 194627, 194628, 194629, 194630, 194631, 194632, 194633, 194634, 194635, 194636,
+    194637, 194638, 194639, 194640, 194641, 194642, 194643, 194644, 194645, 194646, 194647, 194648, 194649, 194650,
+    194651, 194652, 194653, 194654, 194655, 194656, 194657, 194658, 194659, 194660, 194661, 194662, 194663, 194664,
+    194665, 194666, 194667, 194668, 194669, 194670, 194671, 194672, 194673, 194674, 194675, 194676, 194677, 194678,
+    194679, 194680, 194681, 194682, 194683, 194684, 194685, 194686, 194687, 194688, 194689, 194690, 194691, 194692,
+    194693, 194694, 194695, 194696, 194697, 194698, 194699, 194700, 194701, 194702, 194703, 194704, 194705, 194706,
+    194707, 194708, 194709, 194710, 194711, 194712, 194713, 194714, 194715, 194716, 194717, 194718, 194719, 194720,
+    194721, 194722, 194723, 194724, 194725, 194726, 194727, 194728, 194729, 194730, 194731, 194732, 194733, 194734,
+    194735, 194736, 194737, 194738, 194739, 194740, 194741, 194742, 194743, 194744, 194745, 194746, 194747, 194748,
+    194749, 194750, 194751, 194752, 194753, 194754, 194755, 194756, 194757, 194758, 194759, 194760, 194761, 194762,
+    194763, 194764, 194765, 194766, 194767, 194768, 194769, 194770, 194771, 194772, 194773, 194774, 194775, 194776,
+    194777, 194778, 194779, 194780, 194781, 194782, 194783, 194784, 194785, 194786, 194787, 194788, 194789, 194790,
+    194791, 194792, 194793, 194794, 194795, 194796, 194797, 194798, 194799, 194800, 194801, 194802, 194803, 194804,
+    194805, 194806, 194807, 194808, 194809, 194810, 194811, 194812, 194813, 194814, 194815, 194816, 194817, 194818,
+    194819, 194820, 194821, 194822, 194823, 194824, 194825, 194826, 194827, 194828, 194829, 194830, 194831, 194832,
+    194833, 194834, 194835, 194836, 194837, 194838, 194839, 194840, 194841, 194842, 194843, 194844, 194845, 194846,
+    194847, 194848, 194849, 194850, 194851, 194852, 194853, 194854, 194855, 194856, 194857, 194858, 194859, 194860,
+    194861, 194862, 194863, 194864, 194865, 194866, 194867, 194868, 194869, 194870, 194871, 194872, 194873, 194874,
+    194875, 194876, 194877, 194878, 194879, 194880, 194881, 194882, 194883, 194884, 194885, 194886, 194887, 194888,
+    194889, 194890, 194891, 194892, 194893, 194894, 194895, 194896, 194897, 194898, 194899, 194900, 194901, 194902,
+    194903, 194904, 194905, 194906, 194907, 194908, 194909, 194910, 194911, 194912, 194913, 194914, 194915, 194916,
+    194917, 194918, 194919, 194920, 194921, 194922, 194923, 194924, 194925, 194926, 194927, 194928, 194929, 194930,
+    194931, 194932, 194933, 194934, 194935, 194936, 194937, 194938, 194939, 194940, 194941, 194942, 194943, 194944,
+    194945, 194946, 194947, 194948, 194949, 194950, 194951, 194952, 194953, 194954, 194955, 194956, 194957, 194958,
+    194959, 194960, 194961, 194962, 194963, 194964, 194965, 194966, 194967, 194968, 194969, 194970, 194971, 194972,
+    194973, 194974, 194975, 194976, 194977, 194978, 194979, 194980, 194981, 194982, 194983, 194984, 194985, 194986,
+    194987, 194988, 194989, 194990, 194991, 194992, 194993, 194994, 194995, 194996, 194997, 194998, 194999, 195000,
+    195001, 195002, 195003, 195004, 195005, 195006, 195007, 195008, 195009, 195010, 195011, 195012, 195013, 195014,
+    195015, 195016, 195017, 195018, 195019, 195020, 195021, 195022, 195023, 195024, 195025, 195026, 195027, 195028,
+    195029, 195030, 195031, 195032, 195033, 195034, 195035, 195036, 195037, 195038, 195039, 195040, 195041, 195042,
+    195043, 195044, 195045, 195046, 195047, 195048, 195049, 195050, 195051, 195052, 195053, 195054, 195055, 195056,
+    195057, 195058, 195059, 195060, 195061, 195062, 195063, 195064, 195065, 195066, 195067, 195068, 195069, 195070,
+    195071, 195072, 195073, 195074, 195075, 195076, 195077, 195078, 195079, 195080, 195081, 195082, 195083, 195084,
+    195085, 195086, 195087, 195088, 195089, 195090, 195091, 195092, 195093, 195094, 195095, 195096, 195097, 195098,
+    195099, 195100, 195101
+)
+
+private fun getCanonicalClass(ch: Int): Int {
+    val index: Int = binarySearchRange(canonicalClassesKeys, ch)
+    if (index == -1 || canonicalClassesKeys[index] != ch) {
+        return 0
+    }
+    return canonicalClassesValues[index]
+}
+
+private fun getDecomposition(codePoint: Int): IntArray? {
+    val index: Int = binarySearchRange(decompositionKeys, codePoint)
+    if (index == -1 || decompositionKeys[index] != codePoint) {
+        return null
+    }
+    return decompositionValues[index]
+}
+
+/** Gets canonical class for given codepoint from decomposition mappings table. */
+internal fun getCanonicalClassInternal(ch: Int): Int {
+    return getCanonicalClass(ch)
+}
+
+/** Check if the given character is in table of single decompositions. */
+internal fun hasSingleCodepointDecompositionInternal(ch: Int): Boolean {
+    val index: Int = binarySearchRange(singleDecompositions, ch)
+    return index != -1 && singleDecompositions[index] == ch
+}
+
+/** Returns a decomposition for a given codepoint. */
+internal fun getDecompositionInternal(ch: Int): IntArray? = getDecomposition(ch)
+
+/**
+ * Decomposes the given string represented as an array of codepoints. Saves the decomposition into [outputCodepoints] array.
+ * Returns the length of the decomposition.
+ */
+internal fun decomposeString(inputCodePoints: IntArray, inputLength: Int, outputCodePoints: IntArray): Int {
+    if (inputLength == 0) return 0
+
+    var outputLength = 0
+    for (i in 0 until inputLength) {
+        val decomposition = getDecomposition(inputCodePoints[i])
+        if (decomposition == null) {
+            outputCodePoints[outputLength++] = inputCodePoints[i]
+        } else {
+            decomposition.copyInto(outputCodePoints, outputLength)
+            outputLength += decomposition.size
+        }
+    }
+    return outputLength
+}
+
+/**
+ * Decomposes the given codepoint. Saves the decomposition into [outputCodepoints] array starting with [fromIndex].
+ * Returns the length of the decomposition.
+ */
+internal fun decomposeCodePoint(codePoint: Int, outputCodePoints: IntArray, fromIndex: Int): Int {
+    val decomposition = getDecomposition(codePoint)
+    if (decomposition == null) {
+        outputCodePoints[fromIndex] = codePoint
+        return 1
+    } else {
+        decomposition.copyInto(outputCodePoints, fromIndex)
+        return decomposition.size
+    }
+}
+
+/**
+ * Returns the index of the largest element in [array] smaller or equal to the specified [needle],
+ * or -1 if [needle] is smaller than the smallest element in [array].
+ */
+private fun binarySearchRange(array: IntArray, needle: Int): Int {
+    var bottom = 0
+    var top = array.size - 1
+    var middle = -1
+    var value = 0
+    while (bottom <= top) {
+        middle = (bottom + top) / 2
+        value = array[middle]
+        if (needle > value)
+            bottom = middle + 1
+        else if (needle == value)
+            return middle
+        else
+            top = middle - 1
+    }
+    return middle - (if (needle < value) 1 else 0)
+}

libraries/stdlib/wasm/stubs/native/concurrent.kt

@@ -9,3 +9,23 @@ package kotlin.native.concurrent
 
 internal val Any?.isFrozen
     inline get() = false
+
+internal inline fun <T> T.freeze(): T = this
+
+internal class AtomicReference<T>(public var value: T) {
+    public fun compareAndSwap(expected: T, new: T): T {
+        if (value == expected) {
+            val old = value
+            value = new
+            return old
+        }
+        return value
+    }
+    public fun compareAndSet(expected: T, new: T): Boolean {
+        if (value == expected) {
+            value = new
+            return true
+        }
+        return false
+    }
+}

libraries/stdlib/wasm/test/testUtils.kt

@@ -32,4 +32,4 @@ actual val supportsSuppressedExceptions: Boolean get() = false
 // TODO: implement named group reference in replacement expression
 public actual val supportsNamedCapturingGroup: Boolean get() = false
 
-public actual val regexSplitUnicodeCodePointHandling: Boolean get() = TODO()
+public actual val regexSplitUnicodeCodePointHandling: Boolean get() = true