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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 part of $LIBRARYNAME; | 5 part of $LIBRARYNAME; |
6 | 6 $ANNOTATIONS |
7 /// @domName $DOMNAME$ANNOTATIONS | |
8 class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC { | 7 class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC { |
9 $!MEMBERS | 8 $!MEMBERS |
10 /// @domName ArrayBuffer.slice; | 9 @DomName('ArrayBuffer.slice') |
11 ArrayBuffer slice(int begin, [int end]) { | 10 ArrayBuffer slice(int begin, [int end]) { |
12 // IE10 supports ArrayBuffers but does not have the slice method. | 11 // IE10 supports ArrayBuffers but does not have the slice method. |
13 if (JS('bool', '!!#.slice', this)) { | 12 if (JS('bool', '!!#.slice', this)) { |
14 if (?end) { | 13 if (?end) { |
15 return JS('ArrayBuffer', '#.slice(#, #)', this, begin, end); | 14 return JS('ArrayBuffer', '#.slice(#, #)', this, begin, end); |
16 } | 15 } |
17 return JS('ArrayBuffer', '#.slice(#)', this, begin); | 16 return JS('ArrayBuffer', '#.slice(#)', this, begin); |
18 } else { | 17 } else { |
19 var start = begin; | 18 var start = begin; |
20 // Negative values go from end. | 19 // Negative values go from end. |
21 if (start < 0) { | 20 if (start < 0) { |
22 start = this.byteLength + start; | 21 start = this.byteLength + start; |
23 } | 22 } |
24 var finish = ?end ? min(end, byteLength) : byteLength; | 23 var finish = ?end ? min(end, byteLength) : byteLength; |
25 if (finish < 0) { | 24 if (finish < 0) { |
26 finish = this.byteLength + finish; | 25 finish = this.byteLength + finish; |
27 } | 26 } |
28 var length = max(finish - start, 0); | 27 var length = max(finish - start, 0); |
29 | 28 |
30 var clone = new Int8Array(length); | 29 var clone = new Int8Array(length); |
31 var source = new Int8Array.fromBuffer(this, start); | 30 var source = new Int8Array.fromBuffer(this, start); |
32 for (var i = 0; i < length; ++i) { | 31 for (var i = 0; i < length; ++i) { |
33 clone[i] = source[i]; | 32 clone[i] = source[i]; |
34 } | 33 } |
35 return clone.buffer; | 34 return clone.buffer; |
36 } | 35 } |
37 } | 36 } |
38 } | 37 } |
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