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1 // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 // Efficient JavaScript based implementation of a linked hash map used as a | 5 // Efficient JavaScript based implementation of a linked hash map used as a |
6 // backing map for constant maps and the [LinkedHashMap] patch | 6 // backing map for constant maps and the [LinkedHashMap] patch |
7 | 7 |
8 part of _js_helper; | 8 part of _js_helper; |
9 | 9 |
10 const _USE_ES6_MAPS = const bool.fromEnvironment("dart2js.use.es6.maps"); | 10 const _USE_ES6_MAPS = const bool.fromEnvironment("dart2js.use.es6.maps"); |
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37 static bool get _supportsEs6Maps { | 37 static bool get _supportsEs6Maps { |
38 return JS('returns:bool;depends:none;effects:none;throws:never;gvn:true', | 38 return JS('returns:bool;depends:none;effects:none;throws:never;gvn:true', |
39 'typeof Map != "undefined"'); | 39 'typeof Map != "undefined"'); |
40 } | 40 } |
41 | 41 |
42 JsLinkedHashMap(); | 42 JsLinkedHashMap(); |
43 | 43 |
44 /// If ES6 Maps are available returns a linked hash-map backed by an ES6 Map. | 44 /// If ES6 Maps are available returns a linked hash-map backed by an ES6 Map. |
45 @ForceInline() | 45 @ForceInline() |
46 factory JsLinkedHashMap.es6() { | 46 factory JsLinkedHashMap.es6() { |
47 return (_USE_ES6_MAPS && JsLinkedHashMap._supportsEs6Maps) | 47 return (_USE_ES6_MAPS && JsLinkedHashMap._supportsEs6Maps) |
48 ? new Es6LinkedHashMap<K, V>() | 48 ? new Es6LinkedHashMap<K, V>() |
49 : new JsLinkedHashMap<K, V>(); | 49 : new JsLinkedHashMap<K, V>(); |
50 } | 50 } |
51 | 51 |
52 int get length => _length; | 52 int get length => _length; |
53 bool get isEmpty => _length == 0; | 53 bool get isEmpty => _length == 0; |
54 bool get isNotEmpty => !isEmpty; | 54 bool get isNotEmpty => !isEmpty; |
55 | 55 |
56 Iterable<K> get keys { | 56 Iterable<K> get keys { |
57 return new LinkedHashMapKeyIterable<K>(this); | 57 return new LinkedHashMapKeyIterable<K>(this); |
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416 } else if (_cell == null) { | 416 } else if (_cell == null) { |
417 _current = null; | 417 _current = null; |
418 return false; | 418 return false; |
419 } else { | 419 } else { |
420 _current = _cell.hashMapCellKey; | 420 _current = _cell.hashMapCellKey; |
421 _cell = _cell._next; | 421 _cell = _cell._next; |
422 return true; | 422 return true; |
423 } | 423 } |
424 } | 424 } |
425 } | 425 } |
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