Add a new interceptor class JsArray, and support intercepting some list methods with the new interc…

sdk/lib/_internal/compiler/implementation/lib/js_array.dart

+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+part of _interceptors;
+
+/**
+ * The interceptor class for [List]. The compiler recognizes this
+ * class as an interceptor, and changes references to [:this:] to
+ * actually use the receiver of the method, which is generated as an extra
+ * argument added to each member.
+ */
+class JSArray<E> implements List<E> {
+  const JSArray();
+
+  void add(E value) {
+    checkGrowable(this, 'add');
+    JS('void', r'#.push(#)', this, value);
+  }
+
+  E removeAt(int index) {
+    if (index is !int) throw new ArgumentError(index);
+    if (index < 0 || index >= length) {
+      throw new RangeError.value(index);
+    }
+    checkGrowable(this, 'removeAt');
+    return JS('var', r'#.splice(#, 1)[0]', this, index);
+  }
+
+  E removeLast() {
+    checkGrowable(this, 'removeLast');
+    if (length == 0) throw new RangeError.value(-1);
+    return JS('var', r'#.pop()', this);
+  }
+
+  List<E> filter(bool f(E element)) {
+    return Collections.filter(this, <E>[], f);
+  }
+
+  void addAll(Collection<E> collection) {
+    for (Element e in collection) {
+      this.add(e);
+    }
+  }
+
+  void addLast(E value) {
+    checkGrowable(this, 'addLast');
+    JS('void', r'#.push(#)', this, value);
+  }
+
+  void clear() {
+    length = 0;
+  }
+
+  void forEach(void f(E element)) {
+    return Collections.forEach(this, f);
+  }
+
+  Collection map(f(E element)) {
+    return Collections.map(this, [], f);
+  }
+
+  reduce(initialValue, combine(previousValue, E element)) {
+    return Collections.reduce(this, initialValue, combine);
+  }
+
+  List<E> getRange(int start, int length) {
+    // TODO(ngeoffray): Parameterize the return value.
+    if (0 == length) return [];
+    checkNull(start); // TODO(ahe): This is not specified but co19 tests it.
+    checkNull(length); // TODO(ahe): This is not specified but co19 tests it.
+    if (start is !int) throw new ArgumentError(start);
+    if (length is !int) throw new ArgumentError(length);
+    if (length < 0) throw new ArgumentError(length);
+    if (start < 0) throw new RangeError.value(start);
+    int end = start + length;
+    if (end > this.length) {
+      throw new RangeError.value(length);
+    }
+    if (length < 0) throw new ArgumentError(length);
+    return JS('List', r'#.slice(#, #)', this, start, end);
+  }
+}