tor-browser

uc-005.js (6134B)

---

/* -*- indent-tabs-mode: nil; js-indent-level: 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:    15 July 2002
* SUMMARY: Testing identifiers with double-byte names
* See http://bugzilla.mozilla.org/show_bug.cgi?id=58274
*
* Here is a sample of the problem:
*
*    js> function f\u02B1 () {}
*
*    js> f\u02B1.toSource();
*    function f¦() {}
*
*    js> f\u02B1.toSource().toSource();
*    (new String("function f\xB1() {}"))
*
*
* See how the high-byte information (the 02) has been lost?
* The same thing was happening with the toString() method:
*
*    js> f\u02B1.toString();
*
*    function f¦() {
*    }
*
*    js> f\u02B1.toString().toSource();
*    (new String("\nfunction f\xB1() {\n}\n"))
*
*/
//-----------------------------------------------------------------------------
var UBound = 0;
var BUGNUMBER = 58274;
var summary = 'Testing identifiers with double-byte names';
var status = '';
var statusitems = [];
var actual = '';
var actualvalues = [];
var expect= '';
var expectedvalues = [];


/*
* Define a function that uses double-byte identifiers in
* "every possible way"
*
* Then recover each double-byte identifier via f.toString().
* To make this easier, put a 'Z' token before every one.
*
* Our eval string will be:
*
* sEval = "function Z\u02b1(Z\u02b2, b) {
*          try { Z\u02b3 : var Z\u02b4 = Z\u02b1; }
*          catch (Z\u02b5) { for (var Z\u02b6 in Z\u02b5)
*          {for (1; 1<0; Z\u02b7++) {new Array()[Z\u02b6] = 1;} };} }";
*
* It will be helpful to build this string in stages:
*/
var s0 =  'function Z';
var s1 =  '\u02b1(Z';
var s2 =  '\u02b2, b) {try { Z';
var s3 =  '\u02b3 : var Z';
var s4 =  '\u02b4 = Z';
var s5 =  '\u02b1; } catch (Z'
 var s6 =  '\u02b5) { for (var Z';
var s7 =  '\u02b6 in Z';
var s8 =  '\u02b5){for (1; 1<0; Z';
var s9 =  '\u02b7++) {new Array()[Z';
var s10 = '\u02b6] = 1;} };} }';


/*
* Concatenate these and eval() to create the function Z\u02b1
*/
var sEval = s0 + s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10;
eval(sEval);


/*
* Recover all the double-byte identifiers via Z\u02b1.toString().
* We'll recover the 1st one as arrID[1], the 2nd one as arrID[2],
* and so on ...
*/
var arrID = getIdentifiers(Z\u02b1);


/*
* Now check that we got back what we put in -
*/
status = inSection(1);
actual = arrID[1];
expect = s1.charAt(0);
addThis();

status = inSection(2);
actual = arrID[2];
expect = s2.charAt(0);
addThis();

status = inSection(3);
actual = arrID[3];
expect = s3.charAt(0);
addThis();

status = inSection(4);
actual = arrID[4];
expect = s4.charAt(0);
addThis();

status = inSection(5);
actual = arrID[5];
expect = s5.charAt(0);
addThis();

status = inSection(6);
actual = arrID[6];
expect = s6.charAt(0);
addThis();

status = inSection(7);
actual = arrID[7];
expect = s7.charAt(0);
addThis();

status = inSection(8);
actual = arrID[8];
expect = s8.charAt(0);
addThis();

status = inSection(9);
actual = arrID[9];
expect = s9.charAt(0);
addThis();

status = inSection(10);
actual = arrID[10];
expect = s10.charAt(0);
addThis();




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



/*
* Goal: recover the double-byte identifiers from f.toString()
* by getting the very next character after each 'Z' token.
*
* The return value will be an array |arr| indexed such that
* |arr[1]| is the 1st identifier, |arr[2]| the 2nd, and so on.
*
* Note, however, f.toString() is implementation-independent.
* For example, it may begin with '\nfunction' instead of 'function'.
*
* Rhino uses a Unicode representation for f.toString(); whereas
* SpiderMonkey uses an ASCII representation, putting escape sequences
* for non-ASCII characters. For example, if a function is called f\u02B1,
* then in Rhino the toString() method will present a 2-character Unicode
* string for its name, whereas SpiderMonkey will present a 7-character
* ASCII string for its name: the string literal 'f\u02B1'.
*
* So we force the lexer to condense the string before we use it.
* This will give uniform results in Rhino and SpiderMonkey.
*/
function getIdentifiers(f)
{
 var str = condenseStr(f.toString());
 var arr = str.split('Z');

 /*
  * The identifiers are the 1st char of each split substring
  * EXCEPT the first one, which is just ('\n' +) 'function '.
  *
  * Thus note the 1st identifier will be stored in |arr[1]|,
  * the 2nd one in |arr[2]|, etc., making the indexing easy -
  */
 for (i in arr)
   arr[i] = arr[i].charAt(0);
 return arr;
}


/*
* This function is the opposite of a functions like escape(), which take
* Unicode characters and return escape sequences for them. Here, we force
* the lexer to turn escape sequences back into single characters.
*
* Note we can't simply do |eval(str)|, since in practice |str| will be an
* identifier somewhere in the program (e.g. a function name); thus |eval(str)|
* would return the object that the identifier represents: not what we want.
*
* So we surround |str| lexicographically with quotes to force the lexer to
* evaluate it as a string. Have to strip out any linefeeds first, however -
*/
function condenseStr(str)
{
 /*
  * You won't be able to do the next step if |str| has
  * any carriage returns or linefeeds in it. For example:
  *
  *  js> eval("'" + '\nHello' + "'");
  *  1: SyntaxError: unterminated string literal:
  *  1: '
  *  1: ^
  *
  * So replace them with the empty string -
  */
 str = str.replace(/[\r\n]/g, '')
   return eval("'" + str + "'")
   }


function addThis()
{
 statusitems[UBound] = status;
 actualvalues[UBound] = actual;
 expectedvalues[UBound] = expect;
 UBound++;
}


function test()
{
 printBugNumber(BUGNUMBER);
 printStatus(summary);

 for (var i=0; i<UBound; i++)
 {
   reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]);
 }
}