| /* -*- tab-width: 2; indent-tabs-mode: nil; js-indent-level: 2 -*- */ |
| /* This Source Code Form is subject to the terms of the Mozilla Public |
| * License, v. 2.0. If a copy of the MPL was not distributed with this |
| * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| |
| |
| /** |
| File Name: 15.5.4.10-1.js |
| ECMA Section: 15.5.4.10 String.prototype.substring( start, end ) |
| Description: |
| |
| 15.5.4.10 String.prototype.substring(start, end) |
| |
| Returns a substring of the result of converting this object to a string, |
| starting from character position start and running to character position |
| end of the string. The result is a string value, not a String object. |
| |
| If either argument is NaN or negative, it is replaced with zero; if either |
| argument is larger than the length of the string, it is replaced with the |
| length of the string. |
| |
| If start is larger than end, they are swapped. |
| |
| When the substring method is called with two arguments start and end, the |
| following steps are taken: |
| |
| 1. Call ToString, giving it the this value as its argument. |
| 2. Call ToInteger(start). |
| 3. Call ToInteger (end). |
| 4. Compute the number of characters in Result(1). |
| 5. Compute min(max(Result(2), 0), Result(4)). |
| 6. Compute min(max(Result(3), 0), Result(4)). |
| 7. Compute min(Result(5), Result(6)). |
| 8. Compute max(Result(5), Result(6)). |
| 9. Return a string whose length is the difference between Result(8) and |
| Result(7), containing characters from Result(1), namely the characters |
| with indices Result(7) through Result(8)1, in ascending order. |
| |
| Note that the substring 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. |
| |
| Author: christine@netscape.com |
| Date: 12 november 1997 |
| */ |
| |
| var SECTION = "15.5.4.10-1"; |
| var VERSION = "ECMA_1"; |
| startTest(); |
| var TITLE = "String.prototype.substring( start, end )"; |
| |
| writeHeaderToLog( SECTION + " "+ TITLE); |
| |
| new TestCase( SECTION, "String.prototype.substring.length", 2, 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(1,0)", |
| "", |
| eval("var s = new String(''); s.substring(1,0)") ); |
| |
| new TestCase( SECTION, |
| "var s = new String('this is a string object'); s.substring(true, false)", |
| "t", |
| eval("var s = new String('this is a string object'); s.substring(false, true)") ); |
| |
| new TestCase( SECTION, |
| "var s = new String('this is a string object'); s.substring(NaN, Infinity)", |
| "this is a string object", |
| eval("var s = new String('this is a string object'); s.substring(NaN, Infinity)") ); |
| |
| |
| new TestCase( SECTION, |
| "var s = new String('this is a string object'); s.substring(Infinity, NaN)", |
| "this is a string object", |
| eval("var s = new String('this is a string object'); s.substring(Infinity, NaN)") ); |
| |
| |
| new TestCase( SECTION, |
| "var s = new String('this is a string object'); s.substring(Infinity, Infinity)", |
| "", |
| eval("var s = new String('this is a string object'); s.substring(Infinity, Infinity)") ); |
| |
| new TestCase( SECTION, |
| "var s = new String('this is a string object'); s.substring(-0.01, 0)", |
| "", |
| eval("var s = new String('this is a string object'); s.substring(-0.01,0)") ); |
| |
| |
| new TestCase( SECTION, |
| "var s = new String('this is a string object'); s.substring(s.length, s.length)", |
| "", |
| eval("var s = new String('this is a string object'); s.substring(s.length, s.length)") ); |
| |
| new TestCase( SECTION, |
| "var s = new String('this is a string object'); s.substring(s.length+1, 0)", |
| "this is a string object", |
| eval("var s = new String('this is a string object'); s.substring(s.length+1, 0)") ); |
| |
| |
| new TestCase( SECTION, |
| "var s = new String('this is a string object'); s.substring(-Infinity, -Infinity)", |
| "", |
| eval("var s = new String('this is a string object'); s.substring(-Infinity, -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(Infinity,-Infinity)", |
| "1,2,3,4,5", |
| eval("var s = new Array(1,2,3,4,5); s.substring = String.prototype.substring; s.substring(Infinity,-Infinity)") ); |
| |
| new TestCase( SECTION, |
| "var s = new Array(1,2,3,4,5); s.substring = String.prototype.substring; s.substring(true, false)", |
| "1", |
| eval("var s = new Array(1,2,3,4,5); s.substring = String.prototype.substring; s.substring(true, false)") ); |
| |
| new TestCase( SECTION, |
| "var s = new Array(1,2,3,4,5); s.substring = String.prototype.substring; s.substring('4', '5')", |
| "3", |
| eval("var s = new Array(1,2,3,4,5); s.substring = String.prototype.substring; s.substring('4', '5')") ); |
| |
| |
| // this is an object object |
| new TestCase( SECTION, |
| "var obj = new Object(); obj.substring = String.prototype.substring; obj.substring(8,0)", |
| "[object ", |
| eval("var obj = new Object(); obj.substring = String.prototype.substring; obj.substring(8,0)") ); |
| |
| new TestCase( SECTION, |
| "var obj = new Object(); obj.substring = String.prototype.substring; obj.substring(8,obj.toString().length)", |
| "Object]", |
| eval("var obj = new Object(); obj.substring = String.prototype.substring; obj.substring(8, obj.toString().length)") ); |
| |
| // 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, Infinity)", |
| "Function]", |
| eval("var obj = new Function(); obj.substring = String.prototype.substring; obj.toString = Object.prototype.toString; obj.substring(8,Infinity)") ); |
| // this is a number object |
| new TestCase( SECTION, |
| "var obj = new Number(NaN); obj.substring = String.prototype.substring; obj.substring(Infinity, NaN)", |
| "NaN", |
| eval("var obj = new Number(NaN); obj.substring = String.prototype.substring; obj.substring(Infinity, NaN)") ); |
| |
| // this is the Math object |
| new TestCase( SECTION, |
| "var obj = Math; obj.substring = String.prototype.substring; obj.substring(Math.PI, -10)", |
| "[ob", |
| eval("var obj = Math; obj.substring = String.prototype.substring; obj.substring(Math.PI, -10)") ); |
| |
| // this is a Boolean object |
| |
| new TestCase( SECTION, |
| "var obj = new Boolean(); obj.substring = String.prototype.substring; obj.substring(new Array(), new Boolean(1))", |
| "f", |
| eval("var obj = new Boolean(); obj.substring = String.prototype.substring; obj.substring(new Array(), new Boolean(1))") ); |
| |
| // this is a user defined object |
| |
| new TestCase( SECTION, |
| "var obj = new MyObject( void 0 ); obj.substring(0, 100)", |
| "undefined", |
| eval( "var obj = new MyObject( void 0 ); obj.substring(0,100)") ); |
| |
| test(); |
| |
| function MyObject( value ) { |
| this.value = value; |
| this.substring = String.prototype.substring; |
| this.toString = new Function ( "return this.value+''" ); |
| } |