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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 /// dart2js "primitives", that is, features that cannot be implemented without | 5 /// dart2js "primitives", that is, features that cannot be implemented without |
6 /// access to JavaScript features. | 6 /// access to JavaScript features. |
7 library dart2js._js_primitives; | 7 library dart2js._js_primitives; |
8 | 8 |
9 import 'dart:_foreign_helper' show | 9 import 'dart:_foreign_helper' show JS; |
10 JS; | |
11 | 10 |
12 /** | 11 /** |
13 * This is the low-level method that is used to implement [print]. It is | 12 * This is the low-level method that is used to implement [print]. It is |
14 * possible to override this function from JavaScript by defining a function in | 13 * possible to override this function from JavaScript by defining a function in |
15 * JavaScript called "dartPrint". | 14 * JavaScript called "dartPrint". |
16 * | 15 * |
17 * Notice that it is also possible to intercept calls to [print] from within a | 16 * Notice that it is also possible to intercept calls to [print] from within a |
18 * Dart program using zones. This means that there is no guarantee that a call | 17 * Dart program using zones. This means that there is no guarantee that a call |
19 * to print ends in this method. | 18 * to print ends in this method. |
20 */ | 19 */ |
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41 if (JS('bool', r'typeof print == "function"')) { | 40 if (JS('bool', r'typeof print == "function"')) { |
42 JS('void', r'print(#)', string); | 41 JS('void', r'print(#)', string); |
43 return; | 42 return; |
44 } | 43 } |
45 | 44 |
46 // This is somewhat nasty, but we don't want to drag in a bunch of | 45 // This is somewhat nasty, but we don't want to drag in a bunch of |
47 // dependencies to handle a situation that cannot happen. So we | 46 // dependencies to handle a situation that cannot happen. So we |
48 // avoid using Dart [:throw:] and Dart [toString]. | 47 // avoid using Dart [:throw:] and Dart [toString]. |
49 JS('void', 'throw "Unable to print message: " + String(#)', string); | 48 JS('void', 'throw "Unable to print message: " + String(#)', string); |
50 } | 49 } |
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