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1 // Copyright 2006-2008 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2008 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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467 return %ToNumber(this); | 467 return %ToNumber(this); |
468 } | 468 } |
469 | 469 |
470 | 470 |
471 // Convert the receiver to a string - forward to ToString. | 471 // Convert the receiver to a string - forward to ToString. |
472 function TO_STRING() { | 472 function TO_STRING() { |
473 return %ToString(this); | 473 return %ToString(this); |
474 } | 474 } |
475 | 475 |
476 | 476 |
| 477 // Specialized version of String.charAt. It assumes string as |
| 478 // the receiver type and that the index is a number. |
| 479 function STRING_CHAR_AT(pos) { |
| 480 var char_code = %_FastCharCodeAt(this, pos); |
| 481 if (!%_IsSmi(char_code)) { |
| 482 return %StringCharAt(this, pos); |
| 483 } |
| 484 return %CharFromCode(char_code); |
| 485 } |
| 486 |
| 487 |
477 /* ------------------------------------- | 488 /* ------------------------------------- |
478 - - - C o n v e r s i o n s - - - | 489 - - - C o n v e r s i o n s - - - |
479 ------------------------------------- | 490 ------------------------------------- |
480 */ | 491 */ |
481 | 492 |
482 // ECMA-262, section 9.1, page 30. Use null/undefined for no hint, | 493 // ECMA-262, section 9.1, page 30. Use null/undefined for no hint, |
483 // (1) for number hint, and (2) for string hint. | 494 // (1) for number hint, and (2) for string hint. |
484 function ToPrimitive(x, hint) { | 495 function ToPrimitive(x, hint) { |
485 // Fast case check. | 496 // Fast case check. |
486 if (IS_STRING(x)) return x; | 497 if (IS_STRING(x)) return x; |
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603 throw %MakeTypeError('cannot_convert_to_primitive', []); | 614 throw %MakeTypeError('cannot_convert_to_primitive', []); |
604 } | 615 } |
605 | 616 |
606 | 617 |
607 // NOTE: Setting the prototype for Array must take place as early as | 618 // NOTE: Setting the prototype for Array must take place as early as |
608 // possible due to code generation for array literals. When | 619 // possible due to code generation for array literals. When |
609 // generating code for a array literal a boilerplate array is created | 620 // generating code for a array literal a boilerplate array is created |
610 // that is cloned when running the code. It is essiential that the | 621 // that is cloned when running the code. It is essiential that the |
611 // boilerplate gets the right prototype. | 622 // boilerplate gets the right prototype. |
612 %FunctionSetPrototype($Array, new $Array(0)); | 623 %FunctionSetPrototype($Array, new $Array(0)); |
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