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1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2013, 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 library dart2js.util.setlet; | 5 library dart2js.util.setlet; |
6 | 6 |
7 import 'dart:collection' show IterableBase; | 7 import 'dart:collection' show IterableBase; |
8 | 8 |
9 class Setlet<E> extends IterableBase<E> implements Set<E> { | 9 class Setlet<E> extends IterableBase<E> implements Set<E> { |
10 static const _MARKER = const _SetletMarker(); | 10 static const _MARKER = const _SetletMarker(); |
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243 clear() { | 243 clear() { |
244 _contents = _MARKER; | 244 _contents = _MARKER; |
245 _extra = null; | 245 _extra = null; |
246 } | 246 } |
247 | 247 |
248 Set<E> union(Set<E> other) => new Set<E>.from(this)..addAll(other); | 248 Set<E> union(Set<E> other) => new Set<E>.from(this)..addAll(other); |
249 | 249 |
250 Setlet<E> intersection(Set<E> other) => | 250 Setlet<E> intersection(Set<E> other) => |
251 new Setlet<E>.from(this.where((e) => other.contains(e))); | 251 new Setlet<E>.from(this.where((e) => other.contains(e))); |
252 | 252 |
253 Setlet<E> difference(Set<E> other) => | 253 Setlet<E> difference(Set<Object> other) => |
254 new Setlet<E>.from(this.where((e) => !other.contains(e))); | 254 new Setlet<E>.from(this.where((e) => !other.contains(e))); |
255 | 255 |
256 Setlet<E> toSet() { | 256 Setlet<E> toSet() { |
257 Setlet<E> result = new Setlet<E>(); | 257 Setlet<E> result = new Setlet<E>(); |
258 if (_extra == null) { | 258 if (_extra == null) { |
259 result._contents = _contents; | 259 result._contents = _contents; |
260 } else if (_extra == _MARKER) { | 260 } else if (_extra == _MARKER) { |
261 result._extra = _MARKER; | 261 result._extra = _MARKER; |
262 result._contents = _contents.toSet(); | 262 result._contents = _contents.toSet(); |
263 } else { | 263 } else { |
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306 if (Setlet._MARKER != candidate) { | 306 if (Setlet._MARKER != candidate) { |
307 _current = candidate; | 307 _current = candidate; |
308 _remaining--; | 308 _remaining--; |
309 return true; | 309 return true; |
310 } | 310 } |
311 } | 311 } |
312 _current = null; | 312 _current = null; |
313 return false; | 313 return false; |
314 } | 314 } |
315 } | 315 } |
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