gecko-dev/js/tests/ecma/String/15.5.4.4-3.js
1999-11-02 22:23:59 +00:00

118 lines
5.3 KiB
JavaScript

/* The contents of this file are subject to the Netscape Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is Mozilla Communicator client code, released March
* 31, 1998.
*
* The Initial Developer of the Original Code is Netscape Communications
* Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*
*/
/**
File Name: 15.5.4.4-3.js
ECMA Section: 15.5.4.4 String.prototype.charAt(pos)
Description: Returns a string containing the character at position
pos in the string. If there is no character at that
string, the result is the empty string. The result is
a string value, not a String object.
When the charAt method is called with one argument,
pos, the following steps are taken:
1. Call ToString, with this value as its argument
2. Call ToInteger pos
3. Compute the number of characters in Result(1)
4. If Result(2) is less than 0 is or not less than
Result(3), return the empty string
5. Return a string of length 1 containing one character
from result (1), the character at position Result(2).
Note that the charAt function is intentionally generic;
it does not require that its this value be a String
object. Therefore it can be transferred to other kinds
of objects for use as a method.
This tests assiging charAt to a user-defined function.
Author: christine@netscape.com
Date: 2 october 1997
*/
var SECTION = "15.5.4.4-3";
var VERSION = "ECMA_1";
startTest();
var TITLE = "String.prototype.charAt";
writeHeaderToLog( SECTION + " "+ TITLE);
var testcases = getTestCases();
test();
function MyObject (v) {
this.value = v;
this.toString = new Function( "return this.value +'';" );
this.valueOf = new Function( "return this.value" );
this.charAt = String.prototype.charAt;
}
function getTestCases() {
var array = new Array();
var item = 0;
var foo = new MyObject('hello');
array[item++] = new TestCase( SECTION, "var foo = new MyObject('hello'); ", "h", foo.charAt(0) );
array[item++] = new TestCase( SECTION, "var foo = new MyObject('hello'); ", "e", foo.charAt(1) );
array[item++] = new TestCase( SECTION, "var foo = new MyObject('hello'); ", "l", foo.charAt(2) );
array[item++] = new TestCase( SECTION, "var foo = new MyObject('hello'); ", "l", foo.charAt(3) );
array[item++] = new TestCase( SECTION, "var foo = new MyObject('hello'); ", "o", foo.charAt(4) );
array[item++] = new TestCase( SECTION, "var foo = new MyObject('hello'); ", "", foo.charAt(-1) );
array[item++] = new TestCase( SECTION, "var foo = new MyObject('hello'); ", "", foo.charAt(5) );
var boo = new MyObject(true);
array[item++] = new TestCase( SECTION, "var boo = new MyObject(true); ", "t", boo.charAt(0) );
array[item++] = new TestCase( SECTION, "var boo = new MyObject(true); ", "r", boo.charAt(1) );
array[item++] = new TestCase( SECTION, "var boo = new MyObject(true); ", "u", boo.charAt(2) );
array[item++] = new TestCase( SECTION, "var boo = new MyObject(true); ", "e", boo.charAt(3) );
var noo = new MyObject( Math.PI );
array[item++] = new TestCase( SECTION, "var noo = new MyObject(Math.PI); ", "3", noo.charAt(0) );
array[item++] = new TestCase( SECTION, "var noo = new MyObject(Math.PI); ", ".", noo.charAt(1) );
array[item++] = new TestCase( SECTION, "var noo = new MyObject(Math.PI); ", "1", noo.charAt(2) );
array[item++] = new TestCase( SECTION, "var noo = new MyObject(Math.PI); ", "4", noo.charAt(3) );
array[item++] = new TestCase( SECTION, "var noo = new MyObject(Math.PI); ", "1", noo.charAt(4) );
array[item++] = new TestCase( SECTION, "var noo = new MyObject(Math.PI); ", "5", noo.charAt(5) );
array[item++] = new TestCase( SECTION, "var noo = new MyObject(Math.PI); ", "9", noo.charAt(6) );
return array;
}
function test() {
for ( tc = 0; tc < testcases.length; tc++ ) {
testcases[tc].passed = writeTestCaseResult(
testcases[tc].expect,
testcases[tc].actual,
testcases[tc].description +" = "+
testcases[tc].actual );
testcases[tc].reason += ( testcases[tc].passed )
? ""
: "wrong value "
}
stopTest();
// all tests must return a boolean value
return ( testcases );
}