Igor Laevsky
72 lines
2.2 KiB
Kotlin
72 lines
2.2 KiB
Kotlin
/*
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* Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
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* Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
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*/
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package kotlin
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import kotlin.wasm.internal.*
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import kotlin.math.min
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/**
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* The `String` class represents character strings. All string literals in Kotlin programs, such as `"abc"`, are
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* implemented as instances of this class.
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*/
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public class String internal constructor(internal val chars: CharArray) : Comparable<String>, CharSequence {
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public companion object;
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/**
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* Returns a string obtained by concatenating this string with the string representation of the given [other] object.
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*/
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public operator fun plus(other: Any?): String =
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String(chars + other.toString().chars)
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public override val length: Int
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get() = chars.size
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/**
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* Returns the character of this string at the specified [index].
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*
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* If the [index] is out of bounds of this string, throws an [IndexOutOfBoundsException] except in Kotlin/JS
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* where the behavior is unspecified.
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*/
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public override fun get(index: Int): Char = chars[index]
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public override fun subSequence(startIndex: Int, endIndex: Int): CharSequence {
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return String(chars.sliceArray(startIndex until endIndex))
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}
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public override fun compareTo(other: String): Int {
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val len = min(this.length, other.length)
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for (i in 0 until len) {
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val l = this[i]
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val r = other[i]
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if (l != r)
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return l - r
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}
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return this.length - other.length
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}
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public override fun equals(other: Any?): Boolean {
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if (other is String)
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return this.compareTo(other) == 0
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return false
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}
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public override fun toString(): String = this
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private var cachedHash: Int = 0
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public override fun hashCode(): Int {
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if (cachedHash != 0 || this.isEmpty())
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return cachedHash
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var hash = 0
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for (c in chars)
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hash = 31 * hash + c.toInt()
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cachedHash = hash
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return cachedHash
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}
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}
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internal fun stringLiteral(startAddr: Int, length: Int) = String(unsafeRawMemoryToCharArray(startAddr, length))
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