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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 library _foreign_helper; | 5 library _foreign_helper; |
6 | 6 |
7 import 'dart:_js_embedded_names' show JsGetName, JsBuiltin; | 7 import 'dart:_js_embedded_names' show JsGetName, JsBuiltin; |
8 | 8 |
9 /** | 9 /** |
10 * Emits a JavaScript code fragment parameterized by arguments. | 10 * Emits a JavaScript code fragment parametrized by arguments. |
11 * | 11 * |
12 * Hash characters `#` in the [codeTemplate] are replaced in left-to-right order | 12 * Hash characters `#` in the [codeTemplate] are replaced in left-to-right order |
13 * with expressions that contain the values of, or evaluate to, the arguments. | 13 * with expressions that contain the values of, or evaluate to, the arguments. |
14 * The number of hash marks must match the number or arguments. Although | 14 * The number of hash marks must match the number or arguments. Although |
15 * declared with arguments [arg0] through [arg2], the form actually has no limit | 15 * declared with arguments [arg0] through [arg2], the form actually has no limit |
16 * on the number of arguments. | 16 * on the number of arguments. |
17 * | 17 * |
18 * The [typeDescription] argument is interpreted as a description of the | 18 * The [typeDescription] argument is interpreted as a description of the |
19 * behavior of the JavaScript code. Currently it describes the side effects | 19 * behavior of the JavaScript code. Currently it describes the side effects |
20 * types that may be returned by the expression, with the additional behavior | 20 * types that may be returned by the expression, with the additional behavior |
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254 } | 254 } |
255 | 255 |
256 /** | 256 /** |
257 * JavaScript string concatenation. Inputs must be Strings. Corresponds to the | 257 * JavaScript string concatenation. Inputs must be Strings. Corresponds to the |
258 * HStringConcat SSA instruction and may be constant-folded. | 258 * HStringConcat SSA instruction and may be constant-folded. |
259 */ | 259 */ |
260 String JS_STRING_CONCAT(String a, String b) { | 260 String JS_STRING_CONCAT(String a, String b) { |
261 // This body is unused, only here for type analysis. | 261 // This body is unused, only here for type analysis. |
262 return JS('String', '# + #', a, b); | 262 return JS('String', '# + #', a, b); |
263 } | 263 } |
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