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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 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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794 function StringTrimRight() { | 794 function StringTrimRight() { |
795 if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) { | 795 if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) { |
796 throw MakeTypeError("called_on_null_or_undefined", | 796 throw MakeTypeError("called_on_null_or_undefined", |
797 ["String.prototype.trimRight"]); | 797 ["String.prototype.trimRight"]); |
798 } | 798 } |
799 return %StringTrim(TO_STRING_INLINE(this), false, true); | 799 return %StringTrim(TO_STRING_INLINE(this), false, true); |
800 } | 800 } |
801 | 801 |
802 var static_charcode_array = new InternalArray(4); | 802 var static_charcode_array = new InternalArray(4); |
803 | 803 |
804 | |
805 function TruncateString(string, new_length) { | |
806 if (new_length == 0) return ""; | |
807 return %TruncateString(string, new_length); | |
808 } | |
809 | |
810 | |
804 // ECMA-262, section 15.5.3.2 | 811 // ECMA-262, section 15.5.3.2 |
805 function StringFromCharCode(code) { | 812 function StringFromCharCode(code) { |
806 var n = %_ArgumentsLength(); | 813 var n = %_ArgumentsLength(); |
807 if (n == 1) { | 814 if (n == 1) { |
808 if (!%_IsSmi(code)) code = ToNumber(code); | 815 if (!%_IsSmi(code)) code = ToNumber(code); |
809 return %_StringCharFromCode(code & 0xffff); | 816 return %_StringCharFromCode(code & 0xffff); |
810 } | 817 } |
811 | 818 |
812 // NOTE: This is not super-efficient, but it is necessary because we | 819 var one_byte = %NewString(n, true); |
Toon Verwaest
2012/12/05 14:29:12
Can we have a javascript macro that indicates that
| |
813 // want to avoid converting to numbers from within the virtual | 820 var i; |
814 // machine. Maybe we can find another way of doing this? | 821 for (i = 0; i < n; i++) { |
815 var codes = static_charcode_array; | |
816 for (var i = 0; i < n; i++) { | |
817 var code = %_Arguments(i); | 822 var code = %_Arguments(i); |
818 if (!%_IsSmi(code)) code = ToNumber(code); | 823 if (!%_IsSmi(code)) code = ToNumber(code) & 0xffff; |
819 codes[i] = code; | 824 if (code > 0x7f) break; |
825 %_OneByteSeqStringSetChar(one_byte, i, code); | |
820 } | 826 } |
821 codes.length = n; | 827 if (i == n) return one_byte; |
822 return %StringFromCharCodeArray(codes); | 828 one_byte = TruncateString(one_byte, i); |
829 | |
830 var two_byte = %NewString(n - i, false); | |
831 for (var j = 0; i < n; i++, j++) { | |
832 var code = %_Arguments(i); | |
833 if (!%_IsSmi(code)) code = ToNumber(code) & 0xffff; | |
834 %_TwoByteSeqStringSetChar(two_byte, j, code); | |
835 } | |
836 return one_byte + two_byte; | |
823 } | 837 } |
824 | 838 |
825 | 839 |
826 // Helper function for very basic XSS protection. | 840 // Helper function for very basic XSS protection. |
827 function HtmlEscape(str) { | 841 function HtmlEscape(str) { |
828 return TO_STRING_INLINE(str).replace(/</g, "<") | 842 return TO_STRING_INLINE(str).replace(/</g, "<") |
829 .replace(/>/g, ">") | 843 .replace(/>/g, ">") |
830 .replace(/"/g, """) | 844 .replace(/"/g, """) |
831 .replace(/'/g, "'"); | 845 .replace(/'/g, "'"); |
832 } | 846 } |
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983 "fixed", StringFixed, | 997 "fixed", StringFixed, |
984 "italics", StringItalics, | 998 "italics", StringItalics, |
985 "small", StringSmall, | 999 "small", StringSmall, |
986 "strike", StringStrike, | 1000 "strike", StringStrike, |
987 "sub", StringSub, | 1001 "sub", StringSub, |
988 "sup", StringSup | 1002 "sup", StringSup |
989 )); | 1003 )); |
990 } | 1004 } |
991 | 1005 |
992 SetUpString(); | 1006 SetUpString(); |
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