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 let declarations in various settings. 29 30 // Global 31 let x; 32 let y = 2; 33 const z = 4; 34 class c { static foo() { return 1; } } 35 36 // Block local 37 { 38 let y; 39 let x = 3; 40 const z = 5; 41 class c { static foo() { return 2; } } 42 } 43 44 assertEquals(undefined, x); 45 assertEquals(2,y); 46 assertEquals(4,z); 47 assertEquals(1, c.foo()); 48 49 if (true) { 50 let y; 51 assertEquals(undefined, y); 52 } 53 54 // Invalid declarations are early errors in harmony mode and thus should trigger 55 // an exception in eval code during parsing, before even compiling or executing 56 // the code. Thus the generated function is not called here. 57 function TestLocalThrows(str, expect) { 58 assertThrows("(function(arg){ 'use strict'; " + str + "})", expect); 59 } 60 61 function TestLocalDoesNotThrow(str) { 62 assertDoesNotThrow("(function(arg){ 'use strict'; " + str + "})()"); 63 } 64 65 // Test let declarations in statement positions. 66 TestLocalThrows("if (true) let x;", SyntaxError); 67 TestLocalThrows("if (true) {} else let x;", SyntaxError); 68 TestLocalThrows("do let x; while (false)", SyntaxError); 69 TestLocalThrows("while (false) let x;", SyntaxError); 70 TestLocalThrows("label: let x;", SyntaxError); 71 TestLocalThrows("for (;false;) let x;", SyntaxError); 72 TestLocalDoesNotThrow("switch (true) { case true: let x; }"); 73 TestLocalDoesNotThrow("switch (true) { default: let x; }"); 74 75 // Test const declarations with initialisers in statement positions. 76 TestLocalThrows("if (true) const x = 1;", SyntaxError); 77 TestLocalThrows("if (true) {} else const x = 1;", SyntaxError); 78 TestLocalThrows("do const x = 1; while (false)", SyntaxError); 79 TestLocalThrows("while (false) const x = 1;", SyntaxError); 80 TestLocalThrows("label: const x = 1;", SyntaxError); 81 TestLocalThrows("for (;false;) const x = 1;", SyntaxError); 82 TestLocalDoesNotThrow("switch (true) { case true: const x = 1; }"); 83 TestLocalDoesNotThrow("switch (true) { default: const x = 1; }"); 84 85 // Test const declarations without initialisers. 86 TestLocalThrows("const x;", SyntaxError); 87 TestLocalThrows("const x = 1, y;", SyntaxError); 88 TestLocalThrows("const x, y = 1;", SyntaxError); 89 90 // Test const declarations without initialisers in statement positions. 91 TestLocalThrows("if (true) const x;", SyntaxError); 92 TestLocalThrows("if (true) {} else const x;", SyntaxError); 93 TestLocalThrows("do const x; while (false)", SyntaxError); 94 TestLocalThrows("while (false) const x;", SyntaxError); 95 TestLocalThrows("label: const x;", SyntaxError); 96 TestLocalThrows("for (;false;) const x;", SyntaxError); 97 TestLocalThrows("switch (true) { case true: const x; }", SyntaxError); 98 TestLocalThrows("switch (true) { default: const x; }", SyntaxError); 99 100 // Test var declarations in statement positions. 101 TestLocalDoesNotThrow("if (true) var x;"); 102 TestLocalDoesNotThrow("if (true) {} else var x;"); 103 TestLocalDoesNotThrow("do var x; while (false)"); 104 TestLocalDoesNotThrow("while (false) var x;"); 105 TestLocalDoesNotThrow("label: var x;"); 106 TestLocalDoesNotThrow("for (;false;) var x;"); 107 TestLocalDoesNotThrow("switch (true) { case true: var x; }"); 108 TestLocalDoesNotThrow("switch (true) { default: var x; }"); 109 110 // Test class declarations with initialisers in statement positions. 111 TestLocalThrows("if (true) class x { };", SyntaxError); 112 TestLocalThrows("if (true) {} else class x { };", SyntaxError); 113 TestLocalThrows("do class x { }; while (false)", SyntaxError); 114 TestLocalThrows("while (false) class x { };", SyntaxError); 115 TestLocalThrows("label: class x { };", SyntaxError); 116 TestLocalThrows("for (;false;) class x { };", SyntaxError); 117 TestLocalDoesNotThrow("switch (true) { case true: class x { }; }"); 118 TestLocalDoesNotThrow("switch (true) { default: class x { }; }"); 119 120 // Test that redeclarations of functions are only allowed in outermost scope. 121 TestLocalThrows("{ let f; var f; }"); 122 TestLocalThrows("{ var f; let f; }"); 123 TestLocalThrows("{ function f() {} let f; }"); 124 TestLocalThrows("{ let f; function f() {} }"); 125 TestLocalThrows("{ function f() {} var f; }"); 126 TestLocalThrows("{ var f; function f() {} }"); 127 TestLocalThrows("{ function f() {} class f {} }"); 128 TestLocalThrows("{ class f {}; function f() {} }"); 129 TestLocalThrows("{ function f() {} function f() {} }"); 130 TestLocalThrows("function f() {} let f;"); 131 TestLocalThrows("let f; function f() {}"); 132 TestLocalThrows("function f() {} class f {}"); 133 TestLocalThrows("class f {}; function f() {}"); 134 TestLocalDoesNotThrow("function arg() {}"); 135 TestLocalDoesNotThrow("function f() {} var f;"); 136 TestLocalDoesNotThrow("var f; function f() {}"); 137 TestLocalDoesNotThrow("function f() {} function f() {}"); 138 139 function g(f) { 140 function f() { return 1 } 141 return f() 142 } 143 assertEquals(1, g(function() { return 2 })) 144 145 146 // Test function declarations in source element and 147 // sloppy statement positions. 148 function f() { 149 // Sloppy source element positions. 150 function g0() { 151 "use strict"; 152 // Strict source element positions. 153 function h() { } 154 { 155 function h1() { } 156 } 157 } 158 { 159 function g1() { } 160 } 161 } 162 f(); 163 164 // Test function declarations in statement position in strict mode. 165 TestLocalThrows("function f() { if (true) function g() {} }", SyntaxError); 166 TestLocalThrows("function f() { if (true) {} else function g() {} }", SyntaxError); 167 TestLocalThrows("function f() { do function g() {} while (false) }", SyntaxError); 168 TestLocalThrows("function f() { while (false) function g() {} }", SyntaxError); 169 TestLocalThrows("function f() { label: function g() {} }", SyntaxError); 170 TestLocalThrows("function f() { for (;false;) function g() {} }", SyntaxError); 171 TestLocalDoesNotThrow("function f() { switch (true) { case true: function g() {} } }"); 172 TestLocalDoesNotThrow("function f() { switch (true) { default: function g() {} } }"); 173
