test/mjsunit/regexp-string-methods.js

// Copyright 2009 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.

// Regexp shouldn't use String.prototype.slice()
var s = new String("foo");
assertEquals("f", s.slice(0,1));
String.prototype.slice = function() { return "x"; }
assertEquals("x", s.slice(0,1));
assertEquals("g", /g/.exec("gg"));

// Regexp shouldn't use String.prototype.charAt()
var f1 = new RegExp("f", "i");
assertEquals("F", f1.exec("F"));
assertEquals("f", "foo".charAt(0));
String.prototype.charAt = function(idx) { return 'g'; };
assertEquals("g", "foo".charAt(0));
var f2 = new RegExp("[g]", "i");
assertEquals("G", f2.exec("G"));
assertTrue(f2.ignoreCase);

// On the other hand test is defined in a semi-coherent way as a call to exec.
// 15.10.6.3
// We match other browsers in using the original value of RegExp.prototype.exec.
// I.e., RegExp.prototype.test shouldn't use the current value of
// RegExp.prototype.exec.
RegExp.prototype.exec = function(string) { return 'x'; }
assertFalse(/f/.test('x'));