tests/mozilla/ecma/String/15.5.4.4-3.js

   1 /* The contents of this file are subject to the Netscape Public
   2  * License Version 1.1 (the "License"); you may not use this file
   3  * except in compliance with the License. You may obtain a copy of
   4  * the License at http://www.mozilla.org/NPL/
   5  *
   6  * Software distributed under the License is distributed on an "AS
   7  * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
   8  * implied. See the License for the specific language governing
   9  * rights and limitations under the License.
  10  *
  11  * The Original Code is Mozilla Communicator client code, released March
  12  * 31, 1998.
  13  *
  14  * The Initial Developer of the Original Code is Netscape Communications
  15  * Corporation. Portions created by Netscape are
  16  * Copyright (C) 1998 Netscape Communications Corporation. All
  17  * Rights Reserved.
  18  *
  19  * Contributor(s):
  20  *
  21  */
  22 /**
  23     File Name:          15.5.4.4-3.js
  24     ECMA Section:       15.5.4.4 String.prototype.charAt(pos)
  25     Description:        Returns a string containing the character at position
  26                         pos in the string.  If there is no character at that
  27                         string, the result is the empty string.  The result is
  28                         a string value, not a String object.
  29
  30                         When the charAt method is called with one argument,
  31                         pos, the following steps are taken:
  32                         1. Call ToString, with this value as its argument
  33                         2. Call ToInteger pos
  34                         3. Compute the number of characters  in Result(1)
  35                         4. If Result(2) is less than 0 is or not less than
  36                            Result(3), return the empty string
  37                         5. Return a string of length 1 containing one character
  38                            from result (1), the character at position Result(2).
  39
  40                         Note that the charAt function is intentionally generic;
  41                         it does not require that its this value be a String
  42                         object.  Therefore it can be transferred to other kinds
  43                         of objects for use as a method.
  44
  45                         This tests assiging charAt to a user-defined function.
  46
  47     Author:             christine@netscape.com
  48     Date:               2 october 1997
  49 */
  50     var SECTION = "15.5.4.4-3";
  51     var VERSION = "ECMA_1";
  52     startTest();
  53     var TITLE   = "String.prototype.charAt";
  54
  55     writeHeaderToLog( SECTION + " "+ TITLE);
  56
  57     var testcases = getTestCases();
  58     test();
  59
  60 function MyObject (v) {
  61     this.value      = v;
  62     this.toString   = new Function( "return this.value +'';" );
  63     this.valueOf    = new Function( "return this.value" );
  64     this.charAt     = String.prototype.charAt;
  65 }
  66 function getTestCases() {
  67     var array = new Array();
  68     var item = 0;
  69
  70     var foo = new MyObject('hello');
  71
  72
  73     array[item++] = new TestCase( SECTION, "var foo = new MyObject('hello'); ", "h", foo.charAt(0)  );
  74     array[item++] = new TestCase( SECTION, "var foo = new MyObject('hello'); ", "e", foo.charAt(1)  );
  75     array[item++] = new TestCase( SECTION, "var foo = new MyObject('hello'); ", "l", foo.charAt(2)  );
  76     array[item++] = new TestCase( SECTION, "var foo = new MyObject('hello'); ", "l", foo.charAt(3)  );
  77     array[item++] = new TestCase( SECTION, "var foo = new MyObject('hello'); ", "o", foo.charAt(4)  );
  78     array[item++] = new TestCase( SECTION, "var foo = new MyObject('hello'); ", "",  foo.charAt(-1)  );
  79     array[item++] = new TestCase( SECTION, "var foo = new MyObject('hello'); ", "",  foo.charAt(5)  );
  80
  81     var boo = new MyObject(true);
  82
  83     array[item++] = new TestCase( SECTION, "var boo = new MyObject(true); ", "t", boo.charAt(0)  );
  84     array[item++] = new TestCase( SECTION, "var boo = new MyObject(true); ", "r", boo.charAt(1)  );
  85     array[item++] = new TestCase( SECTION, "var boo = new MyObject(true); ", "u", boo.charAt(2)  );
  86     array[item++] = new TestCase( SECTION, "var boo = new MyObject(true); ", "e", boo.charAt(3)  );
  87
  88     var noo = new MyObject( Math.PI );
  89
  90     array[item++] = new TestCase( SECTION, "var noo = new MyObject(Math.PI); ", "3", noo.charAt(0)  );
  91     array[item++] = new TestCase( SECTION, "var noo = new MyObject(Math.PI); ", ".", noo.charAt(1)  );
  92     array[item++] = new TestCase( SECTION, "var noo = new MyObject(Math.PI); ", "1", noo.charAt(2)  );
  93     array[item++] = new TestCase( SECTION, "var noo = new MyObject(Math.PI); ", "4", noo.charAt(3)  );
  94     array[item++] = new TestCase( SECTION, "var noo = new MyObject(Math.PI); ", "1", noo.charAt(4)  );
  95     array[item++] = new TestCase( SECTION, "var noo = new MyObject(Math.PI); ", "5", noo.charAt(5)  );
  96     array[item++] = new TestCase( SECTION, "var noo = new MyObject(Math.PI); ", "9", noo.charAt(6)  );
  97
  98     return array;
  99 }
 100
 101 function test() {
 102         for ( tc = 0; tc < testcases.length; tc++ ) {
 103             testcases[tc].passed = writeTestCaseResult(
 104                     testcases[tc].expect,
 105                     testcases[tc].actual,
 106                     testcases[tc].description +" = "+
 107                     testcases[tc].actual );
 108
 109             testcases[tc].reason += ( testcases[tc].passed )
 110                                     ? ""
 111                                     : "wrong value "
 112         }
 113         stopTest();
 114
 115     //  all tests must return a boolean value
 116         return ( testcases );
 117 }