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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/. */

 /**

    File Name:          15.1.2.4.js

    ECMA Section:       15.1.2.4  Function properties of the global object

    escape( string )

    Description:

    The escape function computes a new version of a string value in which

    certain characters have been replaced by a hexadecimal escape sequence.

    The result thus contains no special characters that might have special

    meaning within a URL.

    For characters whose Unicode encoding is 0xFF or less, a two-digit

    escape sequence of the form %xx is used in accordance with RFC1738.

    For characters whose Unicode encoding is greater than 0xFF, a four-

    digit escape sequence of the form %uxxxx is used.

    When the escape function is called with one argument string, the

    following steps are taken:

    1.  Call ToString(string).

    2.  Compute the number of characters in Result(1).

    3.  Let R be the empty string.

    4.  Let k be 0.

    5.  If k equals Result(2), return R.

    6.  Get the character at position k within Result(1).

    7.  If Result(6) is one of the 69 nonblank ASCII characters

    ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz

    0123456789 @*_+-./, go to step 14.

    8.  Compute the 16-bit unsigned integer that is the Unicode character

    encoding of Result(6).

    9.  If Result(8), is less than 256, go to step 12.

    10.  Let S be a string containing six characters "%uwxyz" where wxyz are

    four hexadecimal digits encoding the value of Result(8).

    11.  Go to step 15.

    12.  Let S be a string containing three characters "%xy" where xy are two

    hexadecimal digits encoding the value of Result(8).

    13.  Go to step 15.

    14.  Let S be a string containing the single character Result(6).

    15.  Let R be a new string value computed by concatenating the previous value

    of R and S.

    16.  Increase k by 1.

    17.  Go to step 5.

    Author:             christine@netscape.com

    Date:               28 october 1997

 */

 var SECTION = "15.1.2.4";

 var VERSION = "ECMA_1";

 startTest();

 var TITLE   = "escape(string)";

 writeHeaderToLog( SECTION + " "+ TITLE);

 new TestCase( SECTION, "escape.length",         1,          escape.length );

 new TestCase( SECTION, "escape.length = null; escape.length",   1,  eval("escape.length = null; escape.length") );

 new TestCase( SECTION, "delete escape.length",                  false,  delete escape.length );

 new TestCase( SECTION, "delete escape.length; escape.length",   1,      eval("delete escape.length; escape.length") );

 new TestCase( SECTION, "var MYPROPS=''; for ( var p in escape ) { MYPROPS+= p}; MYPROPS",    "",    eval("var MYPROPS=''; for ( var p in escape ) { MYPROPS+= p}; MYPROPS") );

 new TestCase( SECTION, "escape()",              "undefined",    escape() );

 new TestCase( SECTION, "escape('')",            "",             escape('') );

 new TestCase( SECTION, "escape( null )",        "null",         escape(null) );

 new TestCase( SECTION, "escape( void 0 )",      "undefined",    escape(void 0) );

 new TestCase( SECTION, "escape( true )",        "true",         escape( true ) );

 new TestCase( SECTION, "escape( false )",       "false",        escape( false ) );

 new TestCase( SECTION, "escape( new Boolean(true) )",   "true", escape(new Boolean(true)) );

 new TestCase( SECTION, "escape( new Boolean(false) )",  "false",    escape(new Boolean(false)) );

 new TestCase( SECTION, "escape( Number.NaN  )",                 "NaN",      escape(Number.NaN) );

 new TestCase( SECTION, "escape( -0 )",                          "0",        escape( -0 ) );

 new TestCase( SECTION, "escape( 'Infinity' )",                  "Infinity", escape( "Infinity" ) );

 new TestCase( SECTION, "escape( Number.POSITIVE_INFINITY )",    "Infinity", escape( Number.POSITIVE_INFINITY ) );

 new TestCase( SECTION, "escape( Number.NEGATIVE_INFINITY )",    "-Infinity", escape( Number.NEGATIVE_INFINITY ) );

 var ASCII_TEST_STRING = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789@*_+-./";

 new TestCase( SECTION, "escape( " +ASCII_TEST_STRING+" )",    ASCII_TEST_STRING,  escape( ASCII_TEST_STRING ) );

 // ASCII value less than

 for ( var CHARCODE = 0; CHARCODE < 32; CHARCODE++ ) {

   new TestCase( SECTION,

 		"escape(String.fromCharCode("+CHARCODE+"))",

 		"%"+ToHexString(CHARCODE),

 		escape(String.fromCharCode(CHARCODE))  );

 }

 for ( var CHARCODE = 128; CHARCODE < 256; CHARCODE++ ) {

   new TestCase( SECTION,

 		"escape(String.fromCharCode("+CHARCODE+"))",

 		"%"+ToHexString(CHARCODE),

 		escape(String.fromCharCode(CHARCODE))  );

 }

 for ( var CHARCODE = 256; CHARCODE < 1024; CHARCODE++ ) {

   new TestCase( SECTION,

 		"escape(String.fromCharCode("+CHARCODE+"))",

 		"%u"+ ToUnicodeString(CHARCODE),

 		escape(String.fromCharCode(CHARCODE))  );

 }

 for ( var CHARCODE = 65500; CHARCODE < 65536; CHARCODE++ ) {

   new TestCase( SECTION,

 		"escape(String.fromCharCode("+CHARCODE+"))",

 		"%u"+ ToUnicodeString(CHARCODE),

 		escape(String.fromCharCode(CHARCODE))  );

 }

 test();

 function ToUnicodeString( n ) {

   var string = ToHexString(n);

   for ( var PAD = (4 - string.length ); PAD > 0; PAD-- ) {

     string = "0" + string;

   }

   return string;

 }

 function ToHexString( n ) {

   var hex = new Array();

   for ( var mag = 1; Math.pow(16,mag) <= n ; mag++ ) {

     ;

   }

   for ( index = 0, mag -= 1; mag > 0; index++, mag-- ) {

     hex[index] = Math.floor( n / Math.pow(16,mag) );

     n -= Math.pow(16,mag) * Math.floor( n/Math.pow(16,mag) );

   }

   hex[hex.length] = n % 16;

   var string ="";

   for ( var index = 0 ; index < hex.length ; index++ ) {

     switch ( hex[index] ) {

     case 10:

       string += "A";

       break;

     case 11:

       string += "B";

       break;

     case 12:

       string += "C";

       break;

     case 13:

       string += "D";

       break;

     case 14:

       string += "E";

       break;

     case 15:

       string += "F";

       break;

     default:

       string += hex[index];

     }

   }

   if ( string.length == 1 ) {

     string = "0" + string;

   }

   return string;

 }