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// 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();
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