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| 1 // Copyright 2014 the V8 project authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 // Flags: --harmony-tostring |
| 6 |
| 7 var global = this; |
| 8 |
| 9 var funs = { |
| 10 Object: [ Object ], |
| 11 Function: [ Function ], |
| 12 Array: [ Array ], |
| 13 String: [ String ], |
| 14 Boolean: [ Boolean ], |
| 15 Number: [ Number ], |
| 16 Date: [ Date ], |
| 17 RegExp: [ RegExp ], |
| 18 Error: [ Error, TypeError, RangeError, SyntaxError, ReferenceError, |
| 19 EvalError, URIError ] |
| 20 } |
| 21 for (f in funs) { |
| 22 for (i in funs[f]) { |
| 23 assertEquals("[object " + f + "]", |
| 24 Object.prototype.toString.call(new funs[f][i]), |
| 25 funs[f][i]); |
| 26 assertEquals("[object Function]", |
| 27 Object.prototype.toString.call(funs[f][i]), |
| 28 funs[f][i]); |
| 29 } |
| 30 } |
| 31 |
| 32 function testToStringTag(className) { |
| 33 // Using builtin toStringTags |
| 34 var obj = {}; |
| 35 obj[Symbol.toStringTag] = className; |
| 36 assertEquals("[object ~" + className + "]", |
| 37 Object.prototype.toString.call(obj)); |
| 38 |
| 39 // Getter throws |
| 40 obj = {}; |
| 41 Object.defineProperty(obj, Symbol.toStringTag, { |
| 42 get: function() { throw className; } |
| 43 }); |
| 44 assertThrows(function() { |
| 45 Object.prototype.toString.call(obj); |
| 46 }, className); |
| 47 |
| 48 // Getter does not throw |
| 49 obj = {}; |
| 50 Object.defineProperty(obj, Symbol.toStringTag, { |
| 51 get: function() { return className; } |
| 52 }); |
| 53 assertEquals("[object ~" + className + "]", |
| 54 Object.prototype.toString.call(obj)); |
| 55 |
| 56 // Custom, non-builtin toStringTags |
| 57 obj = {}; |
| 58 obj[Symbol.toStringTag] = "X" + className; |
| 59 assertEquals("[object X" + className + "]", |
| 60 Object.prototype.toString.call(obj)); |
| 61 |
| 62 // With getter |
| 63 obj = {}; |
| 64 Object.defineProperty(obj, Symbol.toStringTag, { |
| 65 get: function() { return "X" + className; } |
| 66 }); |
| 67 assertEquals("[object X" + className + "]", |
| 68 Object.prototype.toString.call(obj)); |
| 69 |
| 70 // Undefined toStringTag should return [object className] |
| 71 var obj = className === "Arguments" ? |
| 72 (function() { return arguments; })() : new global[className]; |
| 73 obj[Symbol.toStringTag] = undefined; |
| 74 assertEquals("[object " + className + "]", |
| 75 Object.prototype.toString.call(obj)); |
| 76 |
| 77 // With getter |
| 78 var obj = className === "Arguments" ? |
| 79 (function() { return arguments; })() : new global[className]; |
| 80 Object.defineProperty(obj, Symbol.toStringTag, { |
| 81 get: function() { return undefined; } |
| 82 }); |
| 83 assertEquals("[object " + className + "]", |
| 84 Object.prototype.toString.call(obj)); |
| 85 } |
| 86 |
| 87 [ |
| 88 "Arguments", |
| 89 "Array", |
| 90 "Boolean", |
| 91 "Date", |
| 92 "Error", |
| 93 "Function", |
| 94 "Number", |
| 95 "RegExp", |
| 96 "String" |
| 97 ].forEach(testToStringTag); |
| 98 |
| 99 function testToStringTagNonString(value) { |
| 100 var obj = {}; |
| 101 obj[Symbol.toStringTag] = value; |
| 102 assertEquals("[object ???]", Object.prototype.toString.call(obj)); |
| 103 |
| 104 // With getter |
| 105 obj = {}; |
| 106 Object.defineProperty(obj, Symbol.toStringTag, { |
| 107 get: function() { return value; } |
| 108 }); |
| 109 assertEquals("[object ???]", Object.prototype.toString.call(obj)); |
| 110 } |
| 111 |
| 112 [ |
| 113 null, |
| 114 function() {}, |
| 115 [], |
| 116 {}, |
| 117 /regexp/, |
| 118 42, |
| 119 Symbol("sym"), |
| 120 new Date(), |
| 121 (function() { return arguments; })(), |
| 122 true, |
| 123 new Error("oops"), |
| 124 new String("str") |
| 125 ].forEach(testToStringTagNonString); |
| 126 |
| 127 function testObjectToStringPropertyDesc() { |
| 128 var desc = Object.getOwnPropertyDescriptor(Object.prototype, "toString"); |
| 129 assertTrue(desc.writable); |
| 130 assertFalse(desc.enumerable); |
| 131 assertTrue(desc.configurable); |
| 132 } |
| 133 testObjectToStringPropertyDesc(); |
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