Introduce ItemArrayLike interface and replace multiple asList adapters with the single one.

js/js.libraries/src/dom/Dom.kt

@@ -62,12 +62,6 @@ fun Document?.elements(namespaceUri: String, localName: String): List<Element> {
 
 // END OF DEPRECATED
 
-/**
- * Returns a view of this [NodeList] as a list of nodes.
- */
-//@Deprecated(W)
-public fun NodeList.asList(): List<Node> = NodeListAsList(this)
-
 /**
  * Returns a view of this [NodeList] as a list of elements assuming that it contains only elements.
  *
@@ -95,14 +89,6 @@ public fun List<Node>.filterElements(): List<Element> {
 public fun NodeList.filterElements(): List<Element> = asList().filterElements()
 
 
-private class NodeListAsList(private val delegate: NodeList) : AbstractList<Node>() {
-    override val size: Int get() = delegate.length
-
-    override fun get(index: Int): Node = when {
-        index in 0..size - 1 -> delegate.item(index)!!
-        else -> throw IndexOutOfBoundsException("index $index is not in range [0 .. ${size - 1})")
-    }
-}
 
 private class ElementListAsList(private val nodeList: NodeList) : AbstractList<Element>() {
     override fun get(index: Int): Element {

js/js.libraries/src/dom/DomJS.kt

@@ -18,29 +18,3 @@ operator fun Document?.get(selector: String): List<Element> {
 operator fun Element.get(selector: String): List<Element> {
     return querySelectorAll(selector).asList().filterElements()
 }
-
-private class HTMLCollectionListView(val collection: HTMLCollection) : AbstractList<HTMLElement>() {
-    override val size: Int get() = collection.length
-
-    override fun get(index: Int): HTMLElement =
-            when {
-                index in 0..size - 1 -> collection.item(index) as HTMLElement
-                else -> throw IndexOutOfBoundsException("index $index is not in range [0 .. ${size - 1})")
-            }
-}
-
-//@Deprecated(W)
-public fun HTMLCollection.asList(): List<HTMLElement> = HTMLCollectionListView(this)
-
-private class DOMTokenListView(val delegate: DOMTokenList) : AbstractList<String>() {
-    override val size: Int get() = delegate.length
-
-    override fun get(index: Int) =
-            when {
-                index in 0..size - 1 -> delegate.item(index)!!
-                else -> throw IndexOutOfBoundsException("index $index is not in range [0 .. ${size - 1})")
-            }
-}
-
-//@Deprecated(W)
-public fun DOMTokenList.asList(): List<String> = DOMTokenListView(this)

js/js.libraries/src/dom/ItemArrayLike.kt

@@ -0,0 +1,34 @@
+/*
+ * Copyright 2010-2017 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+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) as T
+        else -> throw IndexOutOfBoundsException("index $index is not in range [0..$lastIndex)")
+    }
+}

js/js.libraries/src/generated/org.w3c.dom.kt

@@ -2499,15 +2499,15 @@ public external interface Slotable {
     val assignedSlot: HTMLSlotElement?
 }
 
-public external abstract class NodeList {
-    open val length: Int
-    fun item(index: Int): Node?
+public external abstract class NodeList : ItemArrayLike<Node> {
+    override open val length: Int
+    override fun item(index: Int): Node?
 }
 @kotlin.internal.InlineOnly inline operator fun NodeList.get(index: Int): Node? = asDynamic()[index]
 
-public external abstract class HTMLCollection : UnionElementOrHTMLCollection {
-    open val length: Int
-    fun item(index: Int): Element?
+public external abstract class HTMLCollection : UnionElementOrHTMLCollection, ItemArrayLike<Element> {
+    override open val length: Int
+    override fun item(index: Int): Element?
     fun namedItem(name: String): Element?
 }
 @kotlin.internal.InlineOnly inline operator fun HTMLCollection.get(index: Int): Element? = asDynamic()[index]
@@ -2775,9 +2775,9 @@ public inline fun ShadowRootInit(mode: ShadowRootMode?): ShadowRootInit {
     return o
 }
 
-public external abstract class NamedNodeMap {
-    open val length: Int
-    fun item(index: Int): Attr?
+public external abstract class NamedNodeMap : ItemArrayLike<Attr> {
+    override open val length: Int
+    override fun item(index: Int): Attr?
     fun getNamedItem(qualifiedName: String): Attr?
     fun getNamedItemNS(namespace: String?, localName: String): Attr?
     fun setNamedItem(attr: Attr): Attr?
@@ -2935,10 +2935,10 @@ public external interface NodeFilter {
     }
 }
 
-public external abstract class DOMTokenList {
-    open val length: Int
+public external abstract class DOMTokenList : ItemArrayLike<String> {
+    override open val length: Int
     open var value: String
-    fun item(index: Int): String?
+    override fun item(index: Int): String?
     fun contains(token: String): Boolean
     fun add(vararg tokens: String): Unit
     fun remove(vararg tokens: String): Unit
@@ -3037,9 +3037,9 @@ public inline fun DOMRectInit(x: Double? = 0.0, y: Double? = 0.0, width: Double?
     return o
 }
 
-public external interface DOMRectList {
-    val length: Int
-    fun item(index: Int): DOMRect?
+public external interface DOMRectList : ItemArrayLike<DOMRect> {
+    override val length: Int
+    override fun item(index: Int): DOMRect?
 }
 @kotlin.internal.InlineOnly inline operator fun DOMRectList.get(index: Int): DOMRect? = asDynamic()[index]
 

js/js.libraries/src/generated/org.w3c.files.kt

@@ -66,9 +66,9 @@ public inline fun FilePropertyBag(lastModified: Int? = null, type: String? = "")
     return o
 }
 
-public external abstract class FileList {
-    open val length: Int
-    fun item(index: Int): File?
+public external abstract class FileList : ItemArrayLike<File> {
+    override open val length: Int
+    override fun item(index: Int): File?
 }
 @kotlin.internal.InlineOnly inline operator fun FileList.get(index: Int): File? = asDynamic()[index]