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