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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2012, 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 part of _interceptors; | 5 part of _interceptors; |
6 | 6 |
7 /** | 7 /** |
8 * The interceptor class for [List]. The compiler recognizes this | 8 * The interceptor class for [List]. The compiler recognizes this |
9 * class as an interceptor, and changes references to [:this:] to | 9 * class as an interceptor, and changes references to [:this:] to |
10 * actually use the receiver of the method, which is generated as an extra | 10 * actually use the receiver of the method, which is generated as an extra |
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76 JS('void', r'#.fixed$length = Array', list); | 76 JS('void', r'#.fixed$length = Array', list); |
77 return JS('JSFixedArray', '#', list); | 77 return JS('JSFixedArray', '#', list); |
78 } | 78 } |
79 | 79 |
80 static List markUnmodifiableList(List list) { | 80 static List markUnmodifiableList(List list) { |
81 // Functions are stored in the hidden class and not as properties in | 81 // Functions are stored in the hidden class and not as properties in |
82 // the object. We never actually look at the value, but only want | 82 // the object. We never actually look at the value, but only want |
83 // to know if the property exists. | 83 // to know if the property exists. |
84 JS('void', r'#.fixed$length = Array', list); | 84 JS('void', r'#.fixed$length = Array', list); |
85 JS('void', r'#.immutable$list = Array', list); | 85 JS('void', r'#.immutable$list = Array', list); |
86 // TODO(23309): Make it detectable that the list has fixed length. | 86 return JS('JSUnmodifiableArray', '#', list); |
87 return JS('JSArray', '#', list); | |
88 } | 87 } |
89 | 88 |
90 checkMutable(reason) { | 89 checkMutable(reason) { |
91 if (this is !JSMutableArray) { | 90 if (this is !JSMutableArray) { |
92 throw new UnsupportedError(reason); | 91 throw new UnsupportedError(reason); |
93 } | 92 } |
94 } | 93 } |
95 | 94 |
96 checkGrowable(reason) { | 95 checkGrowable(reason) { |
97 if (this is !JSExtendableArray) { | 96 if (this is !JSExtendableArray) { |
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606 * | 605 * |
607 * These classes are really a fiction, and can have no methods, since | 606 * These classes are really a fiction, and can have no methods, since |
608 * getInterceptor always returns JSArray. We should consider pushing the | 607 * getInterceptor always returns JSArray. We should consider pushing the |
609 * 'isGrowable' and 'isMutable' checks into the getInterceptor implementation so | 608 * 'isGrowable' and 'isMutable' checks into the getInterceptor implementation so |
610 * these classes can have specialized implementations. Doing so will challenge | 609 * these classes can have specialized implementations. Doing so will challenge |
611 * many assuptions in the JS backend. | 610 * many assuptions in the JS backend. |
612 */ | 611 */ |
613 class JSMutableArray<E> extends JSArray<E> implements JSMutableIndexable {} | 612 class JSMutableArray<E> extends JSArray<E> implements JSMutableIndexable {} |
614 class JSFixedArray<E> extends JSMutableArray<E> {} | 613 class JSFixedArray<E> extends JSMutableArray<E> {} |
615 class JSExtendableArray<E> extends JSMutableArray<E> {} | 614 class JSExtendableArray<E> extends JSMutableArray<E> {} |
| 615 class JSUnmodifiableArray<E> extends JSArray<E> {} // Already is JSIndexable. |
616 | 616 |
617 | 617 |
618 /// An [Iterator] that iterates a JSArray. | 618 /// An [Iterator] that iterates a JSArray. |
619 /// | 619 /// |
620 class ArrayIterator<E> implements Iterator<E> { | 620 class ArrayIterator<E> implements Iterator<E> { |
621 final JSArray<E> _iterable; | 621 final JSArray<E> _iterable; |
622 final int _length; | 622 final int _length; |
623 int _index; | 623 int _index; |
624 E _current; | 624 E _current; |
625 | 625 |
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640 | 640 |
641 if (_index >= length) { | 641 if (_index >= length) { |
642 _current = null; | 642 _current = null; |
643 return false; | 643 return false; |
644 } | 644 } |
645 _current = _iterable[_index]; | 645 _current = _iterable[_index]; |
646 _index++; | 646 _index++; |
647 return true; | 647 return true; |
648 } | 648 } |
649 } | 649 } |
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