JezK
Edit File: block-conflicts.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. // Flags: --harmony-scoping // Test for conflicting variable bindings. // TODO(ES6): properly activate extended mode "use strict"; function CheckException(e) { var string = e.toString(); assertTrue(string.indexOf("has already been declared") >= 0 || string.indexOf("redeclaration") >= 0); return 'Conflict'; } function TestFunction(s,e) { try { return eval("(function(){" + s + ";return " + e + "})")(); } catch (x) { return CheckException(x); } } function TestBlock(s,e) { try { return eval("(function(){ if (true) { " + s + "; }; return " + e + "})")(); } catch (x) { return CheckException(x); } } function TestAll(expected,s,opt_e) { var e = ""; var msg = s; if (opt_e) { e = opt_e; msg += "; " + opt_e; } assertEquals(expected, TestFunction(s,e), "function:'" + msg + "'"); assertEquals(expected, TestBlock(s,e), "block:'" + msg + "'"); } function TestConflict(s) { TestAll('Conflict', s); TestAll('Conflict', 'eval("' + s + '")'); } function TestNoConflict(s) { TestAll('NoConflict', s, "'NoConflict'"); TestAll('NoConflict', 'eval("' + s + '")', "'NoConflict'"); } var letbinds = [ "let x", "let x = 0", "let x = undefined", "function x() { }", "let x = function() {}", "let x, y", "let y, x", "const x = 0", "const x = undefined", "const x = function() {}", "const x = 2, y = 3", "const y = 4, x = 5", ]; var varbinds = [ "var x", "var x = 0", "var x = undefined", "var x = function() {}", "var x, y", "var y, x", ]; for (var l = 0; l < letbinds.length; ++l) { // Test conflicting let/var bindings. for (var v = 0; v < varbinds.length; ++v) { // Same level. TestConflict(letbinds[l] +'; ' + varbinds[v]); TestConflict(varbinds[v] +'; ' + letbinds[l]); // Different level. TestConflict(letbinds[l] +'; {' + varbinds[v] + '; }'); TestConflict('{ ' + varbinds[v] +'; }' + letbinds[l]); } // Test conflicting let/let bindings. for (var k = 0; k < letbinds.length; ++k) { // Same level. TestConflict(letbinds[l] +'; ' + letbinds[k]); TestConflict(letbinds[k] +'; ' + letbinds[l]); // Different level. TestNoConflict(letbinds[l] +'; { ' + letbinds[k] + '; }'); TestNoConflict('{ ' + letbinds[k] +'; } ' + letbinds[l]); } // Test conflicting parameter/let bindings. TestConflict('(function (x) { ' + letbinds[l] + '; })()'); } // Test conflicting catch/var bindings. for (var v = 0; v < varbinds.length; ++v) { TestConflict('try {} catch (x) { ' + varbinds[v] + '; }'); } // Test conflicting parameter/var bindings. for (var v = 0; v < varbinds.length; ++v) { TestNoConflict('(function (x) { ' + varbinds[v] + '; })()'); }