tools/dom/templates/html/impl/impl_Storage.darttemplate

// 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 $LIBRARYNAME;

/**
 * The type used by the
 * [Window.localStorage] and [Window.sessionStorage] properties.
 * Storage is implemented as a Map<String, String>.
 *
 * To store and get values, use Dart's built-in map syntax:
 *
 *     window.localStorage['key1'] = 'val1';
 *     window.localStorage['key2'] = 'val2';
 *     window.localStorage['key3'] = 'val3';
 *     assert(window.localStorage['key3'] == 'val3');
 *
 * You can use [Map](https://api.dart.dev/dart-core/Map-class.html) APIs
 * such as containsValue(), clear(), and length:
 *
 *     assert(window.localStorage.containsValue('does not exist') == false);
 *     window.localStorage.clear();
 *     assert(window.localStorage.length == 0);
 *
 */
$(ANNOTATIONS)$(NATIVESPEC)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS
    with MapMixin<String, String> {

  void addAll(Map<String, String> other) {
    other.forEach((k, v) { this[k] = v; });
  }

  // TODO(nweiz): update this when maps support lazy iteration
  bool containsValue(Object$NULLABLE value) => values.any((e) => e == value);

  bool containsKey(Object$NULLABLE key) =>
    _getItem(key $#NULLSAFECAST(as String)) != null;

  String$NULLABLE operator [](Object$NULLABLE key) => _getItem(key $#NULLSAFECAST(as String));

  void operator []=(String key, String value) { _setItem(key, value); }

  String putIfAbsent(String key, String Function() ifAbsent) {
    if (!containsKey(key)) this[key] = ifAbsent();
    return this[key] $#NULLSAFECAST(as String);
  }

  String$NULLABLE remove(Object$NULLABLE key) {
    final value = this[key];
    _removeItem(key $#NULLSAFECAST(as String));
    return value;
  }

  void clear() => _clear();

  void forEach(void Function(String key, String value) f) {
    for (var i = 0; true; i++) {
      final key = _key(i);
      if (key == null) return;

      f(key, this[key]$NULLASSERT);
    }
  }

  Iterable<String> get keys {
    final keys = <String>[];
    forEach((k, v) => keys.add(k));
    return keys;
  }

  Iterable<String> get values {
    final values = <String>[];
    forEach((k, v) => values.add(v));
    return values;
  }

  int get length => _length;

  bool get isEmpty => _key(0) == null;

  bool get isNotEmpty => !isEmpty;
$!MEMBERS
}