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+/* -*- 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: 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:
+ 1. Evaluate Expression.
+ 2. Call GetValue(Result(1)).
+ 3. Call ToObject(Result(2)).
+ 4. Add Result(3) to the front of the scope chain.
+ 5. Evaluate Statement using the augmented scope chain from step 4.
+ 6. Remove Result(3) from the front of the scope chain.
+ 7. 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" );
+}