tests/mozilla/ecma_3/RegExp/octal-002.js

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  35 *
  36 *
  37 * Date:    31 July 2002
  38 * SUMMARY: Testing regexps containing octal escape sequences
  39 * This is an elaboration of mozilla/js/tests/ecma_2/RegExp/octal-003.js
  40 *
  41 * See http://bugzilla.mozilla.org/show_bug.cgi?id=141078
  42 * for a reference on octal escape sequences in regexps.
  43 *
  44 * NOTE:
  45 * We will use the identities '\011' === '\u0009' === '\x09' === '\t'
  46 *
  47 * The first is an octal escape sequence (\(0-3)OO; O an octal digit).
  48 * See ECMA-262 Edition 2, Section 7.7.4 "String Literals". These were
  49 * dropped in Edition 3 but we support them for backward compatibility.
  50 *
  51 * The second is a Unicode escape sequence (\uHHHH; H a hex digit).
  52 * Since octal 11 = hex 9, the two escapes define the same character.
  53 *
  54 * The third is a hex escape sequence (\xHH; H a hex digit).
  55 * Since hex 09 = hex 0009, this defines the same character.
  56 *
  57 * The fourth is the familiar escape sequence for a horizontal tab,
  58 * defined in the ECMA spec as having Unicode value \u0009.
  59 */
  60 //-----------------------------------------------------------------------------
  61 var i = 0;
  62 var bug = 141078;
  63 var summary = 'Testing regexps containing octal escape sequences';
  64 var status = '';
  65 var statusmessages = new Array();
  66 var pattern = '';
  67 var patterns = new Array();
  68 var string = '';
  69 var strings = new Array();
  70 var actualmatch = '';
  71 var actualmatches = new Array();
  72 var expectedmatch = '';
  73 var expectedmatches = new Array();
  74
  75
  76 /*
  77  * Test a string containing the null character '\0' followed by the string '11'
  78  *
  79  *               'a' + String.fromCharCode(0) + '11';
  80  *
  81  * Note we can't simply write 'a\011', because '\011' would be interpreted
  82  * as the octal escape sequence for the tab character (see above).
  83  *
  84  * We should get no match from the regexp /.\011/, because it should be
  85  * looking for the octal escape sequence \011, i.e. the tab character -
  86  *
  87  */
  88 status = inSection(1);
  89 pattern = /.\011/;
  90 string = 'a' + String.fromCharCode(0) + '11';
  91 actualmatch = string.match(pattern);
  92 expectedmatch = null;
  93 addThis();
  94
  95
  96 /*
  97  * Try same thing with 'xx' in place of '11'.
  98  *
  99  * Should get a match now, because the octal escape sequence in the regexp
 100  * has been reduced from \011 to \0, and '\0' is present in the string -
 101  */
 102 status = inSection(2);
 103 pattern = /.\0xx/;
 104 string = 'a' + String.fromCharCode(0) + 'xx';
 105 actualmatch = string.match(pattern);
 106 expectedmatch = Array(string);
 107 addThis();
 108
 109
 110 /*
 111  * Same thing; don't use |String.fromCharCode(0)| this time.
 112  * There is no ambiguity in '\0xx': it is the null character
 113  * followed by two x's, no other interpretation is possible.
 114  */
 115 status = inSection(3);
 116 pattern = /.\0xx/;
 117 string = 'a\0xx';
 118 actualmatch = string.match(pattern);
 119 expectedmatch = Array(string);
 120 addThis();
 121
 122
 123 /*
 124  * This one should produce a match. The two-character string
 125  * 'a' + '\011' is duplicated in the pattern and test string:
 126  */
 127 status = inSection(4);
 128 pattern = /.\011/;
 129 string = 'a\011';
 130 actualmatch = string.match(pattern);
 131 expectedmatch = Array(string);
 132 addThis();
 133
 134
 135 /*
 136  * Same as above, only now, for the second character of the string,
 137  * use the Unicode escape '\u0009' instead of the octal escape '\011'
 138  */
 139 status = inSection(5);
 140 pattern = /.\011/;
 141 string = 'a\u0009';
 142 actualmatch = string.match(pattern);
 143 expectedmatch = Array(string);
 144 addThis();
 145
 146
 147 /*
 148  * Same as above, only now  for the second character of the string,
 149  * use the hex escape '\x09' instead of the octal escape '\011'
 150  */
 151 status = inSection(6);
 152 pattern = /.\011/;
 153 string = 'a\x09';
 154 actualmatch = string.match(pattern);
 155 expectedmatch = Array(string);
 156 addThis();
 157
 158
 159 /*
 160  * Same as above, only now  for the second character of the string,
 161  * use the escape '\t' instead of the octal escape '\011'
 162  */
 163 status = inSection(7);
 164 pattern = /.\011/;
 165 string = 'a\t';
 166 actualmatch = string.match(pattern);
 167 expectedmatch = Array(string);
 168 addThis();
 169
 170
 171 /*
 172  * Return to the string from Section 1.
 173  *
 174  * Unlike Section 1, use the RegExp() function to create the
 175  * regexp pattern: null character followed by the string '11'.
 176  *
 177  * Since this is exactly what the string is, we should get a match -
 178  */
 179 status = inSection(8);
 180 string = 'a' + String.fromCharCode(0) + '11';
 181 pattern = RegExp(string);
 182 actualmatch = string.match(pattern);
 183 expectedmatch = Array(string);
 184 addThis();
 185
 186
 187
 188
 189 //-------------------------------------------------------------------------------------------------
 190 test();
 191 //-------------------------------------------------------------------------------------------------
 192
 193
 194
 195 function addThis()
 196 {
 197   statusmessages[i] = status;
 198   patterns[i] = pattern;
 199   strings[i] = string;
 200   actualmatches[i] = actualmatch;
 201   expectedmatches[i] = expectedmatch;
 202   i++;
 203 }
 204
 205
 206 function test()
 207 {
 208   enterFunc ('test');
 209   printBugNumber (bug);
 210   printStatus (summary);
 211   testRegExp(statusmessages, patterns, strings, actualmatches, expectedmatches);
 212   exitFunc ('test');
 213 }