JezK
Edit File: keywords-and-reserved_words.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. // Test proper handling of keywords, future reserved words and // future reserved words in strict mode as specific by 7.6.1 and 7.6.2 // in ECMA-262. // This code is based on: // http://trac.webkit.org/export/89109/trunk/LayoutTests/fast/js/script-tests/keywords-and-reserved_words.js function isKeyword(x) { try { eval("var " + x + ";"); } catch(e) { return true; } return false; } function isStrictKeyword(x) { try { eval("'use strict'; var "+x+";"); } catch(e) { return true; } return false; } function classifyIdentifier(x) { if (isKeyword(x)) { // All non-strict keywords are also keywords in strict code. if (!isStrictKeyword(x)) { return "ERROR"; } return "keyword"; } // Check for strict mode future reserved words. if (isStrictKeyword(x)) { return "strict"; } return "identifier"; } function testKeyword(word) { // Classify word assertEquals("keyword", classifyIdentifier(word)); // Simple use of a keyword assertThrows("var " + word + " = 1;", SyntaxError); if (word != "this") { assertThrows("typeof (" + word + ");", SyntaxError); } // object literal properties eval("var x = { " + word + " : 42 };"); eval("var x = { get " + word + " () {} };"); eval("var x = { set " + word + " (value) {} };"); // object literal with string literal property names eval("var x = { '" + word + "' : 42 };"); eval("var x = { get '" + word + "' () { } };"); eval("var x = { set '" + word + "' (value) { } };"); // Function names and arguments assertThrows("function " + word + " () { }", SyntaxError); assertThrows("function foo (" + word + ") {}", SyntaxError); assertThrows("function foo (a, " + word + ") { }", SyntaxError); assertThrows("function foo (" + word + ", a) { }", SyntaxError); assertThrows("function foo (a, " + word + ", b) { }", SyntaxError); assertThrows("var foo = function (" + word + ") { }", SyntaxError); // setter parameter assertThrows("var x = { set foo(" + word + ") { } };", SyntaxError); } // Not keywords - these are all just identifiers. var identifiers = [ "x", "keyword", "id", "strict", "identifier", "use", // The following are reserved in ES3 but not in ES5. "abstract", "int", "boolean", "long", "byte", "native", "char", "short", "double", "synchronized", "final", "throws", "float", "transient", "goto", "volatile" ]; for (var i = 0; i < identifiers.length; i++) { assertEquals ("identifier", classifyIdentifier(identifiers[i])); } // 7.6.1.1 Keywords var keywords = [ "break", "in", "case", "instanceof", "catch", "new", "continue", "return", "debugger", "switch", "default", "this", "delete", "throw", "do", "try", "else", "typeof", "finally", "var", "for", "void", "function", "while", "if", "with", // In ES5 "const" is a "future reserved word" but we treat it as a keyword. "const" ]; for (var i = 0; i < keywords.length; i++) { testKeyword(keywords[i]); } // 7.6.1.2 Future Reserved Words (without "const") var future_reserved_words = [ "class", "enum", "export", "extends", "import", "super" ]; for (var i = 0; i < future_reserved_words.length; i++) { testKeyword(future_reserved_words[i]); } // 7.6.1.2 Future Reserved Words, in strict mode only. var future_strict_reserved_words = [ "implements", "interface", "let", "package", "private", "protected", "public", "static", "yield" ]; for (var i = 0; i < future_strict_reserved_words.length; i++) { assertEquals ("strict", classifyIdentifier(future_strict_reserved_words[i])); } // More strict mode specific tests can be found in mjsunit/strict-mode.js.