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Edit File: delete.js
// Copyright 2011 the V8 project authors. All rights reserved. // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are // met: // // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * Redistributions in binary form must reproduce the above // copyright notice, this list of conditions and the following // disclaimer in the documentation and/or other materials provided // with the distribution. // * Neither the name of Google Inc. nor the names of its // contributors may be used to endorse or promote products derived // from this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. // Tests of unary delete in cases where it is always true or always false. // In an effect context, expression is always true. assertEquals(undefined, void (delete 0)); // In an effect context, expression is always false. assertEquals(undefined, (function (x) { delete x; })(0)); // In a pure test context, expression is always true. assertEquals(1, (delete 0) ? 1 : 2); // In a pure test context, expression is always false. assertEquals(2, (function (x) { return (delete x) ? 1 : 2; })(0)); // In a negated test context, expression is always false. assertEquals(1, (function (x) { return !(delete x) ? 1 : 2; })(0)); // In a hybrid test/value context, expression is always true, value // expected in accumulator. assertEquals(3, 1 + ((delete 0) && 2)); // In a hybrid test/value context, expression is always false, value // expected in accumulator. assertEquals(false, (function (x) { return (delete x) && 2; })(0)); // In a hybrid test/value context, expression is always true, value // expected on stack. assertEquals(3, ((delete 0) && 2) + 1); // In a hybrid test/value context, expression is always false, value // expected on stack. assertEquals(1, (function (x) { return ((delete x) && 2) + 1; })(0)); // In a hybrid value/test context, expression is always true, value // expected in accumulator. assertEquals(2, 1 + ((delete 0) || 2)); // In a hybrid value/test context, expression is always false, value // expected in accumulator. assertEquals(2, (function (x) { return (delete x) || 2; })(0)); // In a hybrid value/test context, expression is always true, value // expected on stack. assertEquals(2, ((delete 0) || 2) + 1); // In a hybrid value/test context, expression is always false, value // expected on stack. assertEquals(3, (function (x) { return ((delete x) || 2) + 1; })(0)); // 'this' is not a Reference so delete returns true (see section 11.4.1, // step 2 of ES 5.1). assertEquals(true, delete this); assertEquals(true, (function () { return delete this; })());