michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: 
michael@0: /**
michael@0:    File Name:          15.5.4.4-3.js
michael@0:    ECMA Section:       15.5.4.4 String.prototype.charAt(pos)
michael@0:    Description:        Returns a string containing the character at position
michael@0:    pos in the string.  If there is no character at that
michael@0:    string, the result is the empty string.  The result is
michael@0:    a string value, not a String object.
michael@0: 
michael@0:    When the charAt method is called with one argument,
michael@0:    pos, the following steps are taken:
michael@0:    1. Call ToString, with this value as its argument
michael@0:    2. Call ToInteger pos
michael@0:    3. Compute the number of characters  in Result(1)
michael@0:    4. If Result(2) is less than 0 is or not less than
michael@0:    Result(3), return the empty string
michael@0:    5. Return a string of length 1 containing one character
michael@0:    from result (1), the character at position Result(2).
michael@0: 
michael@0:    Note that the charAt function is intentionally generic;
michael@0:    it does not require that its this value be a String
michael@0:    object.  Therefore it can be transferred to other kinds
michael@0:    of objects for use as a method.
michael@0: 
michael@0:    This tests assiging charAt to a user-defined function.
michael@0: 
michael@0:    Author:             christine@netscape.com
michael@0:    Date:               2 october 1997
michael@0: */
michael@0: var SECTION = "15.5.4.4-3";
michael@0: var VERSION = "ECMA_1";
michael@0: startTest();
michael@0: var TITLE   = "String.prototype.charAt";
michael@0: 
michael@0: writeHeaderToLog( SECTION + " "+ TITLE);
michael@0: 
michael@0: var foo = new MyObject('hello');
michael@0: 
michael@0: 
michael@0: new TestCase( SECTION, "var foo = new MyObject('hello'); ", "h", foo.charAt(0)  );
michael@0: new TestCase( SECTION, "var foo = new MyObject('hello'); ", "e", foo.charAt(1)  );
michael@0: new TestCase( SECTION, "var foo = new MyObject('hello'); ", "l", foo.charAt(2)  );
michael@0: new TestCase( SECTION, "var foo = new MyObject('hello'); ", "l", foo.charAt(3)  );
michael@0: new TestCase( SECTION, "var foo = new MyObject('hello'); ", "o", foo.charAt(4)  );
michael@0: new TestCase( SECTION, "var foo = new MyObject('hello'); ", "",  foo.charAt(-1)  );
michael@0: new TestCase( SECTION, "var foo = new MyObject('hello'); ", "",  foo.charAt(5)  );
michael@0: 
michael@0: var boo = new MyObject(true);
michael@0: 
michael@0: new TestCase( SECTION, "var boo = new MyObject(true); ", "t", boo.charAt(0)  );
michael@0: new TestCase( SECTION, "var boo = new MyObject(true); ", "r", boo.charAt(1)  );
michael@0: new TestCase( SECTION, "var boo = new MyObject(true); ", "u", boo.charAt(2)  );
michael@0: new TestCase( SECTION, "var boo = new MyObject(true); ", "e", boo.charAt(3)  );
michael@0: 
michael@0: var noo = new MyObject( Math.PI );
michael@0: 
michael@0: new TestCase( SECTION, "var noo = new MyObject(Math.PI); ", "3", noo.charAt(0)  );
michael@0: new TestCase( SECTION, "var noo = new MyObject(Math.PI); ", ".", noo.charAt(1)  );
michael@0: new TestCase( SECTION, "var noo = new MyObject(Math.PI); ", "1", noo.charAt(2)  );
michael@0: new TestCase( SECTION, "var noo = new MyObject(Math.PI); ", "4", noo.charAt(3)  );
michael@0: new TestCase( SECTION, "var noo = new MyObject(Math.PI); ", "1", noo.charAt(4)  );
michael@0: new TestCase( SECTION, "var noo = new MyObject(Math.PI); ", "5", noo.charAt(5)  );
michael@0: new TestCase( SECTION, "var noo = new MyObject(Math.PI); ", "9", noo.charAt(6)  );
michael@0: 
michael@0: test();
michael@0: 
michael@0: function MyObject (v) {
michael@0:   this.value      = v;
michael@0:   this.toString   = new Function( "return this.value +'';" );
michael@0:   this.valueOf    = new Function( "return this.value" );
michael@0:   this.charAt     = String.prototype.charAt;
michael@0: }
michael@0: