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Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically embedded into Java applications to provide scripting to end users.
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/*
 *
 * Date:    18 Feb 2002
 * SUMMARY: Testing re.exec(str) when re.lastIndex is < 0 or > str.length
 *
 * Case 1: If re has the global flag set, then re(str) should be null
 * Case 2: If re doesn't have this set, then re(str) should be unaffected
 *
 * See http://bugzilla.mozilla.org/show_bug.cgi?id=76717
 *
 *
 * From the ECMA-262 Final spec:
 *
 * 15.10.6.2 RegExp.prototype.exec(string)
 * Performs a regular expression match of string against the regular
 * expression and returns an Array object containing the results of
 * the match, or null if the string did not match.
 *
 * The string ToString(string) is searched for an occurrence of the
 * regular expression pattern as follows:
 *
 * 1.  Let S be the value of ToString(string).
 * 2.  Let length be the length of S.
 * 3.  Let lastIndex be the value of the lastIndex property.
 * 4.  Let i be the value of ToInteger(lastIndex).
 * 5.  If the global property is false, let i = 0.
 * 6.  If i < 0 or i > length then set lastIndex to 0 and return null.
 * 7.  Call [[Match]], giving it the arguments S and i.
 *     If [[Match]] returned failure, go to step 8;
 *     otherwise let r be its State result and go to step 10.
 * 8.  Let i = i+1.
 * 9.  Go to step 6.
 * 10. Let e be r's endIndex value.
 * 11. If the global property is true, set lastIndex to e.
 *
 *          etc.
 *
 *
 * So:
 *
 * A. If the global flag is not set, |lastIndex| is set to 0
 *    before the match is attempted; thus the match is unaffected.
 *
 * B. If the global flag IS set and re.lastIndex is >= 0 and <= str.length,
 *    |lastIndex| is incremented every time there is a match; not from
 *    i to i+1, but from i to "endIndex" e:
 *
 *      e = (index of last input character matched so far by the pattern) + 1
 *
 *    The match is then attempted from this position in the string (Step 7).
 *
 * C. When the global flag IS set and re.lastIndex is < 0 or > str.length,
 *    |lastIndex| is set to 0 and the match returns null.
 *
 *
 * Note the |lastIndex| property is writeable, and may be set arbitrarily
 * by the programmer - and we will do that below.
 *
 */
//-----------------------------------------------------------------------------
var gTestfile = '15.10.6.2-2.js';
var i = 0;
var BUGNUMBER = 76717;
var summary = 'Testing re.exec(str) when re.lastIndex is < 0 or > str.length';
var status = '';
var statusmessages = new Array();
var pattern = '';
var patterns = new Array();
var string = '';
var strings = new Array();
var actualmatch = '';
var actualmatches = new Array();
var expectedmatch = '';
var expectedmatches = new Array();


/******************************************************************************
 *
 * Case 1 : when the global flag is set -
 *
 *****************************************************************************/
pattern = /abc/gi;
string = 'AbcaBcabC';

status = inSection(1);
actualmatch = pattern.exec(string);
expectedmatch = Array('Abc');
addThis();

status = inSection(2);
actualmatch = pattern.exec(string);
expectedmatch = Array('aBc');
addThis();

status = inSection(3);
actualmatch = pattern.exec(string);
expectedmatch = Array('abC');
addThis();

/*
 * At this point |lastIndex| is > string.length, so the match should be null -
 */
status = inSection(4);
actualmatch = pattern.exec(string);
expectedmatch = null;
addThis();

/*
 * Now let's set |lastIndex| to -1, so the match should again be null -
 */
status = inSection(5);
pattern.lastIndex = -1;
actualmatch = pattern.exec(string);
expectedmatch = null;
addThis();

/*
 * Now try some edge-case values. Thanks to the work done in
 * http://bugzilla.mozilla.org/show_bug.cgi?id=124339, |lastIndex|
 * is now stored as a double instead of a uint32 (unsigned integer).
 *
 * Note 2^32 -1 is the upper bound for uint32's, but doubles can go
 * all the way up to Number.MAX_VALUE. So that's why we need cases
 * between those two numbers.
 */
status = inSection(6);
pattern.lastIndex = Math.pow(2,32);
actualmatch = pattern.exec(string);
expectedmatch = null;
addThis();
 
status = inSection(7);
pattern.lastIndex = -Math.pow(2,32);
actualmatch = pattern.exec(string);
expectedmatch = null;
addThis();

status = inSection(8);
pattern.lastIndex = Math.pow(2,32) + 1;
actualmatch = pattern.exec(string);
expectedmatch = null;
addThis();

status = inSection(9);
pattern.lastIndex = -(Math.pow(2,32) + 1);
actualmatch = pattern.exec(string);
expectedmatch = null;
addThis();

status = inSection(10);
pattern.lastIndex = Math.pow(2,32) * 2;
actualmatch = pattern.exec(string);
expectedmatch = null;
addThis();

status = inSection(11);
pattern.lastIndex = -Math.pow(2,32) * 2;
actualmatch = pattern.exec(string);
expectedmatch = null;
addThis();

status = inSection(12);
pattern.lastIndex = Math.pow(2,40);
actualmatch = pattern.exec(string);
expectedmatch = null;
addThis();

status = inSection(13);
pattern.lastIndex = -Math.pow(2,40);
actualmatch = pattern.exec(string);
expectedmatch = null;
addThis();

status = inSection(14);
pattern.lastIndex = Number.MAX_VALUE;
actualmatch = pattern.exec(string);
expectedmatch = null;
addThis();

status = inSection(15);
pattern.lastIndex = -Number.MAX_VALUE;
actualmatch = pattern.exec(string);
expectedmatch = null;
addThis();
 


/******************************************************************************
 *
 * Case 2: repeat all the above cases WITHOUT the global flag set.
 * According to EMCA. |lastIndex| should get set to 0 before the match.
 *
 * Therefore re.exec(str) should be unaffected; thus our expected values
 * below are now DIFFERENT when |lastIndex| is < 0 or > str.length
 *
 *****************************************************************************/

pattern = /abc/i;
string = 'AbcaBcabC';

status = inSection(16);
actualmatch = pattern.exec(string);
expectedmatch = Array('Abc');
addThis();

status = inSection(17);
actualmatch = pattern.exec(string);
expectedmatch = Array('Abc'); // NOT Array('aBc') as before -
addThis();

status = inSection(18);
actualmatch = pattern.exec(string);
expectedmatch = Array('Abc'); // NOT Array('abC') as before -
addThis();

/*
 * At this point above, |lastIndex| WAS > string.length, but not here -
 */
status = inSection(19);
actualmatch = pattern.exec(string);
expectedmatch = Array('Abc') // NOT null as before -
  addThis();

/*
 * Now let's set |lastIndex| to -1
 */
status = inSection(20);
pattern.lastIndex = -1;
actualmatch = pattern.exec(string);
expectedmatch = Array('Abc') // NOT null as before -
  addThis();

/*
 * Now try some edge-case values. Thanks to the work done in
 * http://bugzilla.mozilla.org/show_bug.cgi?id=124339, |lastIndex|
 * is now stored as a double instead of a uint32 (unsigned integer).
 *
 * Note 2^32 -1 is the upper bound for uint32's, but doubles can go
 * all the way up to Number.MAX_VALUE. So that's why we need cases
 * between those two numbers.
 */
status = inSection(21);
pattern.lastIndex = Math.pow(2,32);
actualmatch = pattern.exec(string);
expectedmatch = Array('Abc') // NOT null as before -
  addThis();
 
status = inSection(22);
pattern.lastIndex = -Math.pow(2,32);
actualmatch = pattern.exec(string);
expectedmatch = Array('Abc') // NOT null as before -
  addThis();

status = inSection(23);
pattern.lastIndex = Math.pow(2,32) + 1;
actualmatch = pattern.exec(string);
expectedmatch = Array('Abc') // NOT null as before -
  addThis();

status = inSection(24);
pattern.lastIndex = -(Math.pow(2,32) + 1);
actualmatch = pattern.exec(string);
expectedmatch = Array('Abc') // NOT null as before -
  addThis();

status = inSection(25);
pattern.lastIndex = Math.pow(2,32) * 2;
actualmatch = pattern.exec(string);
expectedmatch = Array('Abc') // NOT null as before -
  addThis();

status = inSection(26);
pattern.lastIndex = -Math.pow(2,32) * 2;
actualmatch = pattern.exec(string);
expectedmatch = Array('Abc') // NOT null as before -
  addThis();

status = inSection(27);
pattern.lastIndex = Math.pow(2,40);
actualmatch = pattern.exec(string);
expectedmatch = Array('Abc') // NOT null as before -;
  addThis();

status = inSection(28);
pattern.lastIndex = -Math.pow(2,40);
actualmatch = pattern.exec(string);
expectedmatch = Array('Abc') // NOT null as before -
  addThis();

status = inSection(29);
pattern.lastIndex = Number.MAX_VALUE;
actualmatch = pattern.exec(string);
expectedmatch = Array('Abc') // NOT null as before -
  addThis();

status = inSection(30);
pattern.lastIndex = -Number.MAX_VALUE;
actualmatch = pattern.exec(string);
expectedmatch = Array('Abc') // NOT null as before -
  addThis();




//-------------------------------------------------------------------------------------------------
test();
//-------------------------------------------------------------------------------------------------



function addThis()
{
  statusmessages[i] = status;
  patterns[i] = pattern;
  strings[i] = string;
  actualmatches[i] = actualmatch;
  expectedmatches[i] = expectedmatch;
  i++;
}


function test()
{
  enterFunc ('test');
  printBugNumber(BUGNUMBER);
  printStatus (summary);
  testRegExp(statusmessages, patterns, strings, actualmatches, expectedmatches);
  exitFunc ('test');
}