Igor Yakovlev
81 lines
2.8 KiB
Kotlin
81 lines
2.8 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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/**
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* Represents an array (specifically, a Java array when targeting the JVM platform).
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* Array instances can be created using the [arrayOf], [arrayOfNulls] and [emptyArray]
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* standard library functions.
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* See [Kotlin language documentation](https://kotlinlang.org/docs/reference/basic-types.html#arrays)
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* for more information on arrays.
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*/
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public class Array<T> constructor(size: Int) {
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private var storage: WasmAnyArray = WasmAnyArray(size)
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/**
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* Creates a new array with the specified [size], where each element is calculated by calling the specified
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* [init] function.
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*
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* The function [init] is called for each array element sequentially starting from the first one.
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* It should return the value for an array element given its index.
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*/
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@Suppress("TYPE_PARAMETER_AS_REIFIED")
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public constructor(size: Int, init: (Int) -> T) : this(size) {
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storage.fill(size, init)
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}
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/**
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* Returns the array element at the specified [index]. This method can be called using the
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* index operator.
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* ```
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* value = arr[index]
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* ```
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*
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* If the [index] is out of bounds of this array, throws an [IndexOutOfBoundsException] except in Kotlin/JS
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* where the behavior is unspecified.
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*/
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@Suppress("UNCHECKED_CAST")
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public operator fun get(index: Int): T {
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if (index < 0 || index >= storage.len()) throw IndexOutOfBoundsException()
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return storage.get(index) as T
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}
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/**
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* Sets the array element at the specified [index] to the specified [value]. This method can
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* be called using the index operator.
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* ```
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* arr[index] = value
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* ```
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*
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* If the [index] is out of bounds of this array, 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 operator fun set(index: Int, value: T) {
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if (index < 0 || index >= storage.len()) throw IndexOutOfBoundsException()
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storage.set(index, value)
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}
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/**
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* Returns the number of elements in the array.
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*/
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public val size: Int
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get() = storage.len()
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/**
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* Creates an iterator for iterating over the elements of the array.
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*/
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public operator fun iterator(): Iterator<T> = arrayIterator(this)
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}
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internal fun <T> arrayIterator(array: Array<T>) = object : Iterator<T> {
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var index = 0
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override fun hasNext() = index != array.size
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override fun next() = if (index != array.size) array[index++] else throw NoSuchElementException("$index")
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}
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