1 // Copyright 2011 the V8 project authors. All rights reserved. 2 // Redistribution and use in source and binary forms, with or without 3 // modification, are permitted provided that the following conditions are 4 // met: 5 // 6 // * Redistributions of source code must retain the above copyright 7 // notice, this list of conditions and the following disclaimer. 8 // * Redistributions in binary form must reproduce the above 9 // copyright notice, this list of conditions and the following 10 // disclaimer in the documentation and/or other materials provided 11 // with the distribution. 12 // * Neither the name of Google Inc. nor the names of its 13 // contributors may be used to endorse or promote products derived 14 // from this software without specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28 // Test proper handling of keywords, future reserved words and 29 // future reserved words in strict mode as specific by 7.6.1 and 7.6.2 30 // in ECMA-262. 31 32 // This code is based on: 33 // http://trac.webkit.org/export/89109/trunk/LayoutTests/fast/js/script-tests/keywords-and-reserved_words.js 34 35 function isKeyword(x) 36 { 37 try { 38 eval("var " + x + ";"); 39 } catch(e) { 40 return true; 41 } 42 43 return false; 44 } 45 46 function isStrictKeyword(x) 47 { 48 try { 49 eval("'use strict'; var "+x+";"); 50 } catch(e) { 51 return true; 52 } 53 54 return false; 55 } 56 57 function classifyIdentifier(x) 58 { 59 if (isKeyword(x)) { 60 // All non-strict keywords are also keywords in strict code. 61 if (!isStrictKeyword(x)) { 62 return "ERROR"; 63 } 64 return "keyword"; 65 } 66 67 // Check for strict mode future reserved words. 68 if (isStrictKeyword(x)) { 69 return "strict"; 70 } 71 72 return "identifier"; 73 } 74 75 function testKeyword(word) { 76 // Classify word 77 assertEquals("keyword", classifyIdentifier(word)); 78 79 // Simple use of a keyword 80 assertThrows("var " + word + " = 1;", SyntaxError); 81 if (word != "this") { 82 assertThrows("typeof (" + word + ");", SyntaxError); 83 } 84 85 // object literal properties 86 eval("var x = { " + word + " : 42 };"); 87 eval("var x = { get " + word + " () {} };"); 88 eval("var x = { set " + word + " (value) {} };"); 89 90 // object literal with string literal property names 91 eval("var x = { '" + word + "' : 42 };"); 92 eval("var x = { get '" + word + "' () { } };"); 93 eval("var x = { set '" + word + "' (value) { } };"); 94 95 // Function names and arguments 96 assertThrows("function " + word + " () { }", SyntaxError); 97 assertThrows("function foo (" + word + ") {}", SyntaxError); 98 assertThrows("function foo (a, " + word + ") { }", SyntaxError); 99 assertThrows("function foo (" + word + ", a) { }", SyntaxError); 100 assertThrows("function foo (a, " + word + ", b) { }", SyntaxError); 101 assertThrows("var foo = function (" + word + ") { }", SyntaxError); 102 103 // setter parameter 104 assertThrows("var x = { set foo(" + word + ") { } };", SyntaxError); 105 } 106 107 // Not keywords - these are all just identifiers. 108 var identifiers = [ 109 "x", "keyword", 110 "id", "strict", 111 "identifier", "use", 112 // The following are reserved in ES3 but not in ES5. 113 "abstract", "int", 114 "boolean", "long", 115 "byte", "native", 116 "char", "short", 117 "double", "synchronized", 118 "final", "throws", 119 "float", "transient", 120 "goto", "volatile" ]; 121 122 for (var i = 0; i < identifiers.length; i++) { 123 assertEquals ("identifier", classifyIdentifier(identifiers[i])); 124 } 125 126 // 7.6.1.1 Keywords 127 var keywords = [ 128 "break", "in", 129 "case", "instanceof", 130 "catch", "new", 131 "continue", "return", 132 "debugger", "switch", 133 "default", "this", 134 "delete", "throw", 135 "do", "try", 136 "else", "typeof", 137 "finally", "var", 138 "for", "void", 139 "function", "while", 140 "if", "with", 141 // In ES5 "const" is a "future reserved word" but we treat it as a keyword. 142 "const" ]; 143 144 for (var i = 0; i < keywords.length; i++) { 145 testKeyword(keywords[i]); 146 } 147 148 // 7.6.1.2 Future Reserved Words (without "const") 149 var future_reserved_words = [ 150 "class", 151 "enum", 152 "export", 153 "extends", 154 "import", 155 "super" ]; 156 157 for (var i = 0; i < future_reserved_words.length; i++) { 158 testKeyword(future_reserved_words[i]); 159 } 160 161 // 7.6.1.2 Future Reserved Words, in strict mode only. 162 var future_strict_reserved_words = [ 163 "implements", 164 "interface", 165 "let", 166 "package", 167 "private", 168 "protected", 169 "public", 170 "static", 171 "yield" ]; 172 173 for (var i = 0; i < future_strict_reserved_words.length; i++) { 174 assertEquals ("strict", classifyIdentifier(future_strict_reserved_words[i])); 175 } 176 177 // More strict mode specific tests can be found in mjsunit/strict-mode.js. 178
