The Tor Browser: js/src/tests/ecma/Statements/12.10-1.js@6474c204b198 (annotated)

js/src/tests/ecma/Statements/12.10-1.js@6474c204b198 (annotated)

js/src/tests/ecma/Statements/12.10-1.js

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 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:          12.10-1.js
    ECMA Section:       12.10 The with statement
    Description:
    WithStatement :
    with ( Expression ) Statement
    The with statement adds a computed object to the front of the scope chain
    of the current execution context, then executes a statement with this
    augmented scope chain, then restores the scope chain.
    Semantics
    The production WithStatement : with ( Expression ) Statement is evaluated
    as follows:
 .  Evaluate Expression.
 .  Call GetValue(Result(1)).
 .  Call ToObject(Result(2)).
 .  Add Result(3) to the front of the scope chain.
 .  Evaluate Statement using the augmented scope chain from step 4.
 .  Remove Result(3) from the front of the scope chain.
 .  Return Result(5).
    Discussion
    Note that no matter how control leaves the embedded Statement, whether
    normally or by some form of abrupt completion, the scope chain is always
    restored to its former state.
    Author:             christine@netscape.com
    Date:               12 november 1997
 */
 var SECTION = "12.10-1";
 var VERSION = "ECMA_1";
 startTest();
 var TITLE   = "The with statement";
 writeHeaderToLog( SECTION + " "+ TITLE);
 // although the scope chain changes, the this value is immutable for a given
 // execution context.
 new TestCase( SECTION,
 	      "with( new Number() ) { this +'' }",
 	      GLOBAL,
 	      eval("with( new Number() ) { this +'' }") );
 // the object's functions and properties should override those of the
 // global object.
 new TestCase(
   SECTION,
   "var MYOB = new WithObject(true); with (MYOB) { parseInt() }",
   true,
   eval("var MYOB = new WithObject(true); with (MYOB) { parseInt() }") );
 new TestCase(
   SECTION,
   "var MYOB = new WithObject(false); with (MYOB) { NaN }",
   false,
   eval("var MYOB = new WithObject(false); with (MYOB) { NaN }") );
 new TestCase(
   SECTION,
   "var MYOB = new WithObject(NaN); with (MYOB) { Infinity }",
   Number.NaN,
   eval("var MYOB = new WithObject(NaN); with (MYOB) { Infinity }") );
 new TestCase(
   SECTION,
   "var MYOB = new WithObject(false); with (MYOB) { }; Infinity",
   Number.POSITIVE_INFINITY,
   eval("var MYOB = new WithObject(false); with (MYOB) { }; Infinity") );
 new TestCase(
   SECTION,
   "var MYOB = new WithObject(0); with (MYOB) { delete Infinity; Infinity }",
   Number.POSITIVE_INFINITY,
   eval("var MYOB = new WithObject(0); with (MYOB) { delete Infinity; Infinity }") );
 // let us leave the with block via a break.
 new TestCase(
   SECTION,
   "var MYOB = new WithObject(0); while (true) { with (MYOB) { Infinity; break; } } Infinity",
   Number.POSITIVE_INFINITY,
   eval("var MYOB = new WithObject(0); while (true) { with (MYOB) { Infinity; break; } } Infinity") );
 test();
 function WithObject( value ) {
   this.prop1 = 1;
   this.prop2 = new Boolean(true);
   this.prop3 = "a string";
   this.value = value;
   // now we will override global functions
   this.parseInt = new Function( "return this.value" );
   this.NaN = value;
   this.Infinity = value;
   this.unescape = new Function( "return this.value" );
   this.escape   = new Function( "return this.value" );
   this.eval     = new Function( "return this.value" );
   this.parseFloat = new Function( "return this.value" );
   this.isNaN      = new Function( "return this.value" );
   this.isFinite   = new Function( "return this.value" );
 }