Strict version of String.toBoolean() #KT-42071

libraries/stdlib/api/js-v1/kotlin.text.kt

@@ -943,6 +943,12 @@ public inline fun kotlin.String.toBoolean(): kotlin.Boolean
 @kotlin.SinceKotlin(version = "1.4")
 public fun kotlin.String?.toBoolean(): kotlin.Boolean
 
+@kotlin.SinceKotlin(version = "1.5")
+public fun kotlin.String.toBooleanStrict(): kotlin.Boolean
+
+@kotlin.SinceKotlin(version = "1.5")
+public fun kotlin.String.toBooleanStrictOrNull(): kotlin.Boolean?
+
 public fun kotlin.String.toByte(): kotlin.Byte
 
 public fun kotlin.String.toByte(radix: kotlin.Int): kotlin.Byte

libraries/stdlib/api/js/kotlin.text.kt

@@ -943,6 +943,12 @@ public inline fun kotlin.String.toBoolean(): kotlin.Boolean
 @kotlin.SinceKotlin(version = "1.4")
 public fun kotlin.String?.toBoolean(): kotlin.Boolean
 
+@kotlin.SinceKotlin(version = "1.5")
+public fun kotlin.String.toBooleanStrict(): kotlin.Boolean
+
+@kotlin.SinceKotlin(version = "1.5")
+public fun kotlin.String.toBooleanStrictOrNull(): kotlin.Boolean?
+
 public fun kotlin.String.toByte(): kotlin.Byte
 
 public fun kotlin.String.toByte(radix: kotlin.Int): kotlin.Byte

libraries/stdlib/common/src/kotlin/TextH.kt

@@ -279,6 +279,8 @@ public expect fun String.toBoolean(): Boolean
 
 /**
  * Returns `true` if this string is not `null` and its content 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].
  */
 @SinceKotlin("1.4")
 public expect fun String?.toBoolean(): Boolean

libraries/stdlib/js/src/kotlin/text/numberConversions.kt

@@ -16,6 +16,8 @@ public actual inline fun String.toBoolean(): Boolean = this.toBoolean()
 
 /**
  * Returns `true` if this string is not `null` and its content 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].
  */
 @OptIn(ExperimentalStdlibApi::class)
 @SinceKotlin("1.4")

libraries/stdlib/jvm/src/kotlin/text/StringNumberConversionsJVM.kt

@@ -55,6 +55,8 @@ public actual inline fun String.toBoolean(): Boolean = this.toBoolean()
 
 /**
  * Returns `true` if this string is not `null` and its content 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].
  */
 @JvmName("toBooleanNullable")
 @SinceKotlin("1.4")

libraries/stdlib/samples/test/samples/text/strings.kt

@@ -467,4 +467,30 @@ class Strings {
         assertFalse("Kotlin".contentEquals(stringBuilder))
         assertTrue("Kotlin".contentEquals(stringBuilder, ignoreCase = true))
     }
+
+    @Sample
+    fun toBooleanStrict() {
+        assertPrints("true".toBooleanStrict(), "true")
+        assertFails { "True".toBooleanStrict() }
+        assertFails { "TRUE".toBooleanStrict() }
+
+        assertPrints("false".toBooleanStrict(), "false")
+        assertFails { "False".toBooleanStrict() }
+        assertFails { "FALSE".toBooleanStrict() }
+
+        assertFails { "abc".toBooleanStrict() }
+    }
+
+    @Sample
+    fun toBooleanStrictOrNull() {
+        assertPrints("true".toBooleanStrictOrNull(), "true")
+        assertPrints("True".toBooleanStrictOrNull(), "null")
+        assertPrints("TRUE".toBooleanStrictOrNull(), "null")
+
+        assertPrints("false".toBooleanStrictOrNull(), "false")
+        assertPrints("False".toBooleanStrictOrNull(), "null")
+        assertPrints("FALSE".toBooleanStrictOrNull(), "null")
+
+        assertPrints("abc".toBooleanStrictOrNull(), "null")
+    }
 }

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

@@ -1430,4 +1430,36 @@ internal fun CharSequence?.contentEqualsImpl(other: CharSequence?): Boolean {
     }
 
     return true
+}
+
+/**
+ * Returns `true` if the content of this string is equal to the word "true", `false` if it is equal to "false",
+ * and throws an exception otherwise.
+ *
+ * There is also a lenient version of the function available on nullable String, [String?.toBoolean].
+ * Note that this function is case-sensitive.
+ *
+ * @sample samples.text.Strings.toBooleanStrict
+ */
+@SinceKotlin("1.5")
+public fun String.toBooleanStrict(): Boolean = when (this) {
+    "true" -> true
+    "false" -> false
+    else -> throw IllegalArgumentException("The string doesn't represent a boolean value: $this")
+}
+
+/**
+ * Returns `true` if the content of this string is equal to the word "true", `false` if it is equal to "false",
+ * and `null` otherwise.
+ *
+ * There is also a lenient version of the function available on nullable String, [String?.toBoolean].
+ * Note that this function is case-sensitive.
+ *
+ * @sample samples.text.Strings.toBooleanStrictOrNull
+ */
+@SinceKotlin("1.5")
+public fun String.toBooleanStrictOrNull(): Boolean? = when (this) {
+    "true" -> true
+    "false" -> false
+    else -> null
 }

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

@@ -493,6 +493,8 @@ actual fun String.toBoolean(): Boolean = TODO("Wasm stdlib: Text")
 
 /**
  * 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 = TODO("Wasm stdlib: Text")
 

libraries/tools/binary-compatibility-validator/reference-public-api/kotlin-stdlib-runtime-merged.txt

@@ -5516,6 +5516,8 @@ public final class kotlin/text/StringsKt {
 	public static final fun toBigDecimalOrNull (Ljava/lang/String;Ljava/math/MathContext;)Ljava/math/BigDecimal;
 	public static final fun toBigIntegerOrNull (Ljava/lang/String;)Ljava/math/BigInteger;
 	public static final fun toBigIntegerOrNull (Ljava/lang/String;I)Ljava/math/BigInteger;
+	public static final fun toBooleanStrict (Ljava/lang/String;)Z
+	public static final fun toBooleanStrictOrNull (Ljava/lang/String;)Ljava/lang/Boolean;
 	public static final fun toByteOrNull (Ljava/lang/String;)Ljava/lang/Byte;
 	public static final fun toByteOrNull (Ljava/lang/String;I)Ljava/lang/Byte;
 	public static final fun toCharArray (Ljava/lang/String;II)[C