tests/mozilla/ecma_3/Function/regress-58274.js

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  14 * The Original Code is JavaScript Engine testing utilities.
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  35 *
  36 *
  37 * Date:    15 July 2002
  38 * SUMMARY: Testing functions with double-byte names
  39 * See http://bugzilla.mozilla.org/show_bug.cgi?id=58274
  40 *
  41 * Here is a sample of the problem:
  42 *
  43 *    js> function f\u02B1 () {}
  44 *
  45 *    js> f\u02B1.toSource();
  46 *    function f¦() {}
  47 *
  48 *    js> f\u02B1.toSource().toSource();
  49 *    (new String("function f\xB1() {}"))
  50 *
  51 *
  52 * See how the high-byte information (the 02) has been lost?
  53 * The same thing was happening with the toString() method:
  54 *
  55 *    js> f\u02B1.toString();
  56 *
  57 *    function f¦() {
  58 *    }
  59 *
  60 *    js> f\u02B1.toString().toSource();
  61 *    (new String("\nfunction f\xB1() {\n}\n"))
  62 *
  63 */
  64 //-----------------------------------------------------------------------------
  65 var UBound = 0;
  66 var bug = 58274;
  67 var summary = 'Testing functions with double-byte names';
  68 var ERR = 'UNEXPECTED ERROR! \n';
  69 var ERR_MALFORMED_NAME = ERR + 'Could not find function name in: \n\n';
  70 var status = '';
  71 var statusitems = [];
  72 var actual = '';
  73 var actualvalues = [];
  74 var expect= '';
  75 var expectedvalues = [];
  76 var sEval;
  77 var sName;
  78
  79
  80 sEval = "function f\u02B2() {return 42;}";
  81 eval(sEval);
  82 sName = getFunctionName(f\u02B2);
  83
  84 // Test function call -
  85 status = inSection(1);
  86 actual = f\u02B2();
  87 expect = 42;
  88 addThis();
  89
  90 // Test both characters of function name -
  91 status = inSection(2);
  92 actual = sName[0];
  93 expect = sEval[9];
  94 addThis();
  95
  96 status = inSection(3);
  97 actual = sName[1];
  98 expect = sEval[10];
  99 addThis();
 100
 101
 102
 103 sEval = "function f\u02B2\u0AAA () {return 84;}";
 104 eval(sEval);
 105 sName = getFunctionName(f\u02B2\u0AAA);
 106
 107 // Test function call -
 108 status = inSection(4);
 109 actual = f\u02B2\u0AAA();
 110 expect = 84;
 111 addThis();
 112
 113 // Test all three characters of function name -
 114 status = inSection(5);
 115 actual = sName[0];
 116 expect = sEval[9];
 117 addThis();
 118
 119 status = inSection(6);
 120 actual = sName[1];
 121 expect = sEval[10];
 122 addThis();
 123
 124 status = inSection(7);
 125 actual = sName[2];
 126 expect = sEval[11];
 127 addThis();
 128
 129
 130
 131
 132 //-----------------------------------------------------------------------------
 133 test();
 134 //-----------------------------------------------------------------------------
 135
 136
 137
 138 /*
 139  * Goal: test that f.toString() contains the proper function name.
 140  *
 141  * Note, however, f.toString() is implementation-independent. For example,
 142  * it may begin with '\nfunction' instead of 'function'. Therefore we use
 143  * a regexp to make sure we extract the name properly.
 144  *
 145  * Here we assume that f has been defined by means of a function statement,
 146  * and not a function expression (where it wouldn't have to have a name).
 147  *
 148  * Rhino uses a Unicode representation for f.toString(); whereas
 149  * SpiderMonkey uses an ASCII representation, putting escape sequences
 150  * for non-ASCII characters. For example, if a function is called f\u02B1,
 151  * then in Rhino the toString() method will present a 2-character Unicode
 152  * string for its name, whereas SpiderMonkey will present a 7-character
 153  * ASCII string for its name: the string literal 'f\u02B1'.
 154  *
 155  * So we force the lexer to condense the string before using it.
 156  * This will give uniform results in Rhino and SpiderMonkey.
 157  */
 158 function getFunctionName(f)
 159 {
 160   var s = condenseStr(f.toString());
 161   var re = /\s*function\s+(\S+)\s*\(/;
 162   var arr = s.match(re);
 163
 164   if (!(arr && arr[1]))
 165     return ERR_MALFORMED_NAME + s;
 166   return arr[1];
 167 }
 168
 169
 170 /*
 171  * This function is the opposite of functions like escape(), which take
 172  * Unicode characters and return escape sequences for them. Here, we force
 173  * the lexer to turn escape sequences back into single characters.
 174  *
 175  * Note we can't simply do |eval(str)|, since in practice |str| will be an
 176  * identifier somewhere in the program (e.g. a function name); thus |eval(str)|
 177  * would return the object that the identifier represents: not what we want.
 178  *
 179  * So we surround |str| lexicographically with quotes to force the lexer to
 180  * evaluate it as a string. Have to strip out any linefeeds first, however -
 181  */
 182 function condenseStr(str)
 183 {
 184   /*
 185    * You won't be able to do the next step if |str| has
 186    * any carriage returns or linefeeds in it. For example:
 187    *
 188    *  js> eval("'" + '\nHello' + "'");
 189    *  1: SyntaxError: unterminated string literal:
 190    *  1: '
 191    *  1: ^
 192    *
 193    * So replace them with the empty string -
 194    */
 195   str = str.replace(/[\r\n]/g, '')
 196   return eval("'" + str + "'");
 197 }
 198
 199
 200 function addThis()
 201 {
 202   statusitems[UBound] = status;
 203   actualvalues[UBound] = actual;
 204   expectedvalues[UBound] = expect;
 205   UBound++;
 206 }
 207
 208
 209 function test()
 210 {
 211   enterFunc('test');
 212   printBugNumber(bug);
 213   printStatus(summary);
 214
 215   for (var i=0; i<UBound; i++)
 216   {
 217     reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]);
 218   }
 219
 220   exitFunc ('test');
 221 }