JezK
Edit File: short-circuit.js
// Copyright 2009 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. // Test some expression contexts involving short-circuit boolean // operations that did not otherwise have test coverage. var x = 42; // Literals in value/test context. assertEquals(x, function () { return 0 || x }()); assertEquals(1, function () { return 1 || x }()); // Literals in test/value context. assertEquals(0, function () { return 0 && x }()); assertEquals(x, function () { return 1 && x }()); // A value on top of the stack in value/test context. assertEquals(x, function(y) { return y++ || x }(0)); assertEquals(1, function(y) { return y++ || x }(1)); // A value on top of the stack in a test/value context. assertEquals(0, function(y) { return y++ && x }(0)); assertEquals(x, function(y) { return y++ && x }(1)); // An object literal in value context. assertEquals(0, function () { return {x: 0}}().x); // An object literal in value/test context. assertEquals(0, function () { return {x: 0} || this }().x); // An object literal in test/value context. assertEquals(x, function () { return {x: 0} && this }().x); // An array literal in value/test context. assertEquals(0, function () { return [0,1] || new Array(x,1) }()[0]); // An array literal in test/value context. assertEquals(x, function () { return [0,1] && new Array(x,1) }()[0]); // Slot assignment in value/test context. assertEquals(x, function (y) { return (y = 0) || x }("?")); assertEquals(1, function (y) { return (y = 1) || x }("?")); // Slot assignment in test/value context. assertEquals(0, function (y) { return (y = 0) && x }("?")); assertEquals(x, function (y) { return (y = 1) && x }("?")); // void in value context. assertEquals(void 0, function () { return void x }()); // void in value/test context. assertEquals(x, function () { return (void x) || x }()); // void in test/value context. assertEquals(void 0, function () { return (void x) && x }()); // Unary not in value context. assertEquals(false, function () { return !x }()); // Unary not in value/test context. assertEquals(true, function (y) { return !y || x }(0)); assertEquals(x, function (y) { return !y || x }(1)); // Unary not in test/value context. assertEquals(x, function (y) { return !y && x }(0)); assertEquals(false, function (y) { return !y && x }(1)); // Comparison in value context. assertEquals(false, function () { return x < x; }()); // Comparison in value/test context. assertEquals(x, function () { return x < x || x; }()); assertEquals(true, function () { return x <= x || x; }()); // Comparison in test/value context. assertEquals(false, function () { return x < x && x; }()); assertEquals(x, function () { return x <= x && x; }());