// Copyright 2014 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 01-20-14, section 21.1.3.13 function StringRepeat(count) { CHECK_OBJECT_COERCIBLE(this, "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 01-20-14, section 21.1.3.18 function StringStartsWith(searchString /* position */) { // length == 1 CHECK_OBJECT_COERCIBLE(this, "String.prototype.startsWith"); var s = TO_STRING_INLINE(this); if (IS_REGEXP(searchString)) { throw MakeTypeError("first_argument_not_regexp", ["String.prototype.startsWith"]); } 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 01-20-14, section 21.1.3.7 function StringEndsWith(searchString /* position */) { // length == 1 CHECK_OBJECT_COERCIBLE(this, "String.prototype.endsWith"); var s = TO_STRING_INLINE(this); if (IS_REGEXP(searchString)) { throw MakeTypeError("first_argument_not_regexp", ["String.prototype.endsWith"]); } 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 01-20-14, section 21.1.3.6 function StringContains(searchString /* position */) { // length == 1 CHECK_OBJECT_COERCIBLE(this, "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();