slice.js   [plain text]

/* 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): 
 * 
 */
/**
	Filename:     slice.js
	Description:  'This tests out some of the functionality on methods on the Array objects'

	Author:       Nick Lerissa
	Date:         Fri Feb 13 09:58:28 PST 1998
*/

	var SECTION = 'As described in Netscape doc "Whats new in JavaScript 1.2"';
	var VERSION = 'no version';
    startTest();
	var TITLE = 'String:slice';

	writeHeaderToLog('Executing script: slice.js');
	writeHeaderToLog( SECTION + " "+ TITLE);

	var count = 0;
	var testcases = new Array();

	
	function mySlice(a, from, to)
	{
	    var from2       = from;
	    var to2         = to;
	    var returnArray = [];
	    var i;
	
	    if (from2 < 0) from2 = a.length + from;
	    if (to2 < 0)   to2   = a.length + to;
	
	    if ((to2 > from2)&&(to2 > 0)&&(from2 < a.length))
	    {
	        if (from2 < 0)        from2 = 0;
	        if (to2 > a.length) to2 = a.length;
	
	        for (i = from2; i < to2; ++i) returnArray.push(a[i]);
	    }
	    return returnArray;
	}
	
	// This function tests the slice command on an Array
	// passed in. The arguments passed into slice range in
	// value from -5 to the length of the array + 4. Every
	// combination of the two arguments is tested. The expected
	// result of the slice(...) method is calculated and
	// compared to the actual result from the slice(...) method.
	// If the Arrays are not similar false is returned.
	function exhaustiveSliceTest(testname, a)
	{
	    var x = 0;
	    var y = 0;
	    var errorMessage;
	    var reason = "";
	    var passed = true;
	
	    for (x = -(2 + a.length); x <= (2 + a.length); x++)
	        for (y = (2 + a.length); y >= -(2 + a.length); y--)
	        {
	            var b  = a.slice(x,y);
	            var c = mySlice(a,x,y);
	
	            if (String(b) != String(c))
	            {
	                errorMessage =
	                    "ERROR: 'TEST FAILED' ERROR: 'TEST FAILED' ERROR: 'TEST FAILED'\n" +
	                    "            test: " + "a.slice(" + x + "," + y + ")\n" +
	                    "               a: " + String(a) + "\n" +
	                    "   actual result: " + String(b) + "\n" +
	                    " expected result: " + String(c) + "\n";
	                writeHeaderToLog(errorMessage);
	                reason = reason + errorMessage;
	                passed = false;
	            }
	        }
	    var testCase = new TestCase(SECTION, testname, true, passed);
	    if (passed == false)
	        testCase.reason = reason;
	    return testCase;
	}
	
	var a = ['a','test string',456,9.34,new String("string object"),[],['h','i','j','k']];
	var b = [1,2,3,4,5,6,7,8,9,0];
	
	testcases[count++] = exhaustiveSliceTest("exhaustive slice test 1", a);
	testcases[count++] = exhaustiveSliceTest("exhaustive slice test 2", b);
	
	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();
	   return ( testcases );
	}

	test();