| // Copyright 2013 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| 'use strict'; |
| |
| // This file relies on the fact that the following declaration has been made |
| // in runtime.js: |
| // var $String = global.String; |
| // var $Array = global.Array; |
| |
| // ------------------------------------------------------------------- |
| |
| // ES6 draft 07-15-13, section 15.5.3.21 |
| function StringRepeat(count) { |
| if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) { |
| throw MakeTypeError("called_on_null_or_undefined", |
| ["String.prototype.repeat"]); |
| } |
| |
| var s = TO_STRING_INLINE(this); |
| var n = ToInteger(count); |
| if (n < 0 || !NUMBER_IS_FINITE(n)) { |
| throw MakeRangeError("invalid_count_value", []); |
| } |
| |
| var elements = new InternalArray(n); |
| for (var i = 0; i < n; i++) { |
| elements[i] = s; |
| } |
| |
| return %StringBuilderConcat(elements, n, ""); |
| } |
| |
| |
| // ES6 draft 07-15-13, section 15.5.3.22 |
| function StringStartsWith(searchString /* position */) { // length == 1 |
| if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) { |
| throw MakeTypeError("called_on_null_or_undefined", |
| ["String.prototype.startsWith"]); |
| } |
| |
| var s = TO_STRING_INLINE(this); |
| var ss = TO_STRING_INLINE(searchString); |
| var pos = 0; |
| if (%_ArgumentsLength() > 1) { |
| pos = %_Arguments(1); // position |
| pos = ToInteger(pos); |
| } |
| |
| var s_len = s.length; |
| var start = MathMin(MathMax(pos, 0), s_len); |
| var ss_len = ss.length; |
| if (ss_len + start > s_len) { |
| return false; |
| } |
| |
| return %StringIndexOf(s, ss, start) === start; |
| } |
| |
| |
| // ES6 draft 07-15-13, section 15.5.3.23 |
| function StringEndsWith(searchString /* position */) { // length == 1 |
| if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) { |
| throw MakeTypeError("called_on_null_or_undefined", |
| ["String.prototype.endsWith"]); |
| } |
| |
| var s = TO_STRING_INLINE(this); |
| var ss = TO_STRING_INLINE(searchString); |
| var s_len = s.length; |
| var pos = s_len; |
| if (%_ArgumentsLength() > 1) { |
| var arg = %_Arguments(1); // position |
| if (!IS_UNDEFINED(arg)) { |
| pos = ToInteger(arg); |
| } |
| } |
| |
| var end = MathMin(MathMax(pos, 0), s_len); |
| var ss_len = ss.length; |
| var start = end - ss_len; |
| if (start < 0) { |
| return false; |
| } |
| |
| return %StringLastIndexOf(s, ss, start) === start; |
| } |
| |
| |
| // ES6 draft 07-15-13, section 15.5.3.24 |
| function StringContains(searchString /* position */) { // length == 1 |
| if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) { |
| throw MakeTypeError("called_on_null_or_undefined", |
| ["String.prototype.contains"]); |
| } |
| |
| var s = TO_STRING_INLINE(this); |
| var ss = TO_STRING_INLINE(searchString); |
| var pos = 0; |
| if (%_ArgumentsLength() > 1) { |
| pos = %_Arguments(1); // position |
| pos = ToInteger(pos); |
| } |
| |
| var s_len = s.length; |
| var start = MathMin(MathMax(pos, 0), s_len); |
| var ss_len = ss.length; |
| if (ss_len + start > s_len) { |
| return false; |
| } |
| |
| return %StringIndexOf(s, ss, start) !== -1; |
| } |
| |
| |
| // ------------------------------------------------------------------- |
| |
| function ExtendStringPrototype() { |
| %CheckIsBootstrapping(); |
| |
| // Set up the non-enumerable functions on the String prototype object. |
| InstallFunctions($String.prototype, DONT_ENUM, $Array( |
| "repeat", StringRepeat, |
| "startsWith", StringStartsWith, |
| "endsWith", StringEndsWith, |
| "contains", StringContains |
| )); |
| } |
| |
| ExtendStringPrototype(); |