ItemArrayLike.kt

/*
 * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
 * that can be found in the license/LICENSE.txt file.
 */

package org.w3c.dom

public external interface ItemArrayLike<out T> {
    val length: Int
    fun item(index: Int): T?
}

/**
 * Returns the view of this `ItemArrayLike<T>` collection as `List<T>`
 */
public fun <T> ItemArrayLike<T>.asList(): List<T> = object : AbstractList<T>() {
    override val size: Int get() = this@asList.length

    override fun get(index: Int): T = when (index) {
        in 0..lastIndex -> this@asList.item(index).unsafeCast<T>()
        else -> throw IndexOutOfBoundsException("index $index is not in range [0..$lastIndex]")
    }
}