ecma/String/15.5.4.9-1.js

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gTestfile = '15.5.4.9-1.js';

/**
   File Name:          15.5.4.9-1.js
   ECMA Section:       15.5.4.9 String.prototype.substring( start )
   Description:

   15.5.4.9 String.prototype.substring(start)

   Returns a substring of the result of converting this object to a string,
   starting from character position start and running to the end of the
   string. The result is a string value, not a String object.

   If the argument is NaN or negative, it is replaced with zero; if the
   argument is larger than the length of the string, it is replaced with the
   length of the string.

   When the substring method is called with one argument start, the following
   steps are taken:

   1.Call ToString, giving it the this value as its argument.
   2.Call ToInteger(start).
   3.Compute the number of characters in Result(1).
   4.Compute min(max(Result(2), 0), Result(3)).
   5.Return a string whose length is the difference between Result(3) and Result(4),
   containing characters from Result(1), namely the characters with indices Result(4)
   through Result(3)1, in ascending order.

   Author:             christine@netscape.com
   Date:               12 november 1997
*/

var SECTION = "15.5.4.9-1";
var VERSION = "ECMA_1";
startTest();
var TITLE   = "String.prototype.substring( start )";

writeHeaderToLog( SECTION + " "+ TITLE);

new TestCase( SECTION,  "String.prototype.substring.length",        2,          String.prototype.substring.length );
new TestCase( SECTION,  "delete String.prototype.substring.length", false,      delete String.prototype.substring.length );
new TestCase( SECTION,  "delete String.prototype.substring.length; String.prototype.substring.length", 2,      eval("delete String.prototype.substring.length; String.prototype.substring.length") );

// test cases for when substring is called with no arguments.

// this is a string object

new TestCase(   SECTION,
		"var s = new String('this is a string object'); typeof s.substring()",
		"string",
		eval("var s = new String('this is a string object'); typeof s.substring()") );

new TestCase(   SECTION,
		"var s = new String(''); s.substring()",
		"",
		eval("var s = new String(''); s.substring()") );


new TestCase(   SECTION,
		"var s = new String('this is a string object'); s.substring()",
		"this is a string object",
		eval("var s = new String('this is a string object'); s.substring()") );

new TestCase(   SECTION,
		"var s = new String('this is a string object'); s.substring(NaN)",
		"this is a string object",
		eval("var s = new String('this is a string object'); s.substring(NaN)") );


new TestCase(   SECTION,
		"var s = new String('this is a string object'); s.substring(-0.01)",
		"this is a string object",
		eval("var s = new String('this is a string object'); s.substring(-0.01)") );


new TestCase(   SECTION,
		"var s = new String('this is a string object'); s.substring(s.length)",
		"",
		eval("var s = new String('this is a string object'); s.substring(s.length)") );

new TestCase(   SECTION,
		"var s = new String('this is a string object'); s.substring(s.length+1)",
		"",
		eval("var s = new String('this is a string object'); s.substring(s.length+1)") );


new TestCase(   SECTION,
		"var s = new String('this is a string object'); s.substring(Infinity)",
		"",
		eval("var s = new String('this is a string object'); s.substring(Infinity)") );

new TestCase(   SECTION,
		"var s = new String('this is a string object'); s.substring(-Infinity)",
		"this is a string object",
		eval("var s = new String('this is a string object'); s.substring(-Infinity)") );

// this is not a String object, start is not an integer


new TestCase(   SECTION,
		"var s = new Array(1,2,3,4,5); s.substring = String.prototype.substring; s.substring()",
		"1,2,3,4,5",
		eval("var s = new Array(1,2,3,4,5); s.substring = String.prototype.substring; s.substring()") );

new TestCase(   SECTION,
		"var s = new Array(1,2,3,4,5); s.substring = String.prototype.substring; s.substring(true)",
		",2,3,4,5",
		eval("var s = new Array(1,2,3,4,5); s.substring = String.prototype.substring; s.substring(true)") );

new TestCase(   SECTION,
		"var s = new Array(1,2,3,4,5); s.substring = String.prototype.substring; s.substring('4')",
		"3,4,5",
		eval("var s = new Array(1,2,3,4,5); s.substring = String.prototype.substring; s.substring('4')") );

new TestCase(   SECTION,
		"var s = new Array(); s.substring = String.prototype.substring; s.substring('4')",
		"",
		eval("var s = new Array(); s.substring = String.prototype.substring; s.substring('4')") );

// this is an object object
new TestCase(   SECTION,
		"var obj = new Object(); obj.substring = String.prototype.substring; obj.substring(8)",
		"Object]",
		eval("var obj = new Object(); obj.substring = String.prototype.substring; obj.substring(8)") );

// this is a function object
new TestCase(   SECTION,
		"var obj = new Function(); obj.substring = String.prototype.substring; obj.toString = Object.prototype.toString; obj.substring(8)",
		"Function]",
		eval("var obj = new Function(); obj.substring = String.prototype.substring; obj.toString = Object.prototype.toString; obj.substring(8)") );
// this is a number object
new TestCase(   SECTION,
		"var obj = new Number(NaN); obj.substring = String.prototype.substring; obj.substring(false)",
		"NaN",
		eval("var obj = new Number(NaN); obj.substring = String.prototype.substring; obj.substring(false)") );

// this is the Math object
new TestCase(   SECTION,
		"var obj = Math; obj.substring = String.prototype.substring; obj.substring(Math.PI)",
		"ject Math]",
		eval("var obj = Math; obj.substring = String.prototype.substring; obj.substring(Math.PI)") );

// this is a Boolean object

new TestCase(   SECTION,
		"var obj = new Boolean(); obj.substring = String.prototype.substring; obj.substring(new Array())",
		"false",
		eval("var obj = new Boolean(); obj.substring = String.prototype.substring; obj.substring(new Array())") );

// this is a user defined object

new TestCase( SECTION,
	      "var obj = new MyObject( null ); obj.substring(0)",
	      "null",
	      eval( "var obj = new MyObject( null ); obj.substring(0)") );


test();

function MyObject( value ) {
  this.value = value;
  this.substring = String.prototype.substring;
  this.toString = new Function ( "return this.value+''" );
}