Support all digit chars in digitToInt on JVM KT-23451

libraries/stdlib/jvm/test/text/CharJVMTest.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * 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.
  */
 
@@ -9,7 +9,8 @@ import kotlin.test.*
 
 class CharJVMTest {
 
-    @Test fun getCategory() {
+    @Test
+    fun getCategory() {
         assertEquals(CharCategory.DECIMAL_DIGIT_NUMBER, '7'.category)
         assertEquals(CharCategory.CURRENCY_SYMBOL, '$'.category)
         assertEquals(CharCategory.LOWERCASE_LETTER, 'a'.category)
@@ -18,4 +19,16 @@ class CharJVMTest {
         assertTrue(',' in CharCategory.OTHER_PUNCTUATION)
     }
 
+    @Test
+    fun nonAsciiDigitsToInt() {
+        val allDigits = (Char.MIN_VALUE..Char.MAX_VALUE).filter { it.isDigit() }
+        val radixes = listOf(10, 16, 36)
+        allDigits.forEach { c ->
+            assertEquals(Character.digit(c, 10), c.digitToInt(), "$c")
+            for (radix in radixes) {
+                assertEquals(Character.digit(c, radix), c.digitToInt(radix), "$c")
+            }
+        }
+    }
+
 }

libraries/stdlib/src/kotlin/text/Char.kt

@@ -20,11 +20,9 @@ package kotlin.text
 @SinceKotlin("1.5")
 @WasExperimental(ExperimentalStdlibApi::class)
 public fun Char.digitToInt(): Int {
-    // TODO: needs to support all digits in JVM
+    return digitOf(this, 10).also {
-    if (this in '0'..'9') {
+        if (it < 0) throw IllegalArgumentException("Char $this is not a decimal digit")
-        return this - '0'
     }
-    throw IllegalArgumentException("Char $this is not a decimal digit")
 }
 
 /**
@@ -56,11 +54,7 @@ public fun Char.digitToInt(radix: Int): Int {
 @SinceKotlin("1.5")
 @WasExperimental(ExperimentalStdlibApi::class)
 public fun Char.digitToIntOrNull(): Int? {
-    // TODO: needs to support all digits in JVM
+    return digitOf(this, 10).takeIf { it >= 0 }
-    if (this in '0'..'9') {
-        return this - '0'
-    }
-    return null
 }
 
 /**
@@ -77,17 +71,8 @@ public fun Char.digitToIntOrNull(): Int? {
 @SinceKotlin("1.5")
 @WasExperimental(ExperimentalStdlibApi::class)
 public fun Char.digitToIntOrNull(radix: Int): Int? {
-    // TODO: needs to support all digits in JVM
+    checkRadix(radix)
-    if (radix !in 2..36) {
+    return digitOf(this, radix).takeIf { it >= 0 }
-        throw IllegalArgumentException("Invalid radix: $radix. Valid radix values are in range 2..36")
-    }
-    if (this in '0'..'9') {
-        val digit = this - '0'
-        return if (digit < radix) digit else null
-    }
-    val a = if (this <= 'Z') 'A' else 'a'
-    val digit = 10 + (this - a)
-    return if (digit in 10 until radix) digit else null
 }
 
 /**