ecma_3/RegExp/15.10.6.2-2.js

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* The Original Code is JavaScript Engine testing utilities.
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* The Initial Developer of the Original Code is Netscape Communications Corp.
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* Contributor(s): pschwartau (at) netscape.com
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*
*
* 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 i = 0;
var bug = 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 (bug);
  printStatus (summary);
  testRegExp(statusmessages, patterns, strings, actualmatches, expectedmatches);
  exitFunc ('test');
}