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 // Array's toString should call the object's own join method, if one exists and 29 // is callable. Otherwise, just use the original Object.toString function. 30 31 var success = "[test success]"; 32 var expectedThis; 33 function testJoin() { 34 assertEquals(0, arguments.length); 35 assertSame(expectedThis, this); 36 return success; 37 } 38 39 40 // On an Array object. 41 42 // Default case. 43 var a1 = [1, 2, 3]; 44 assertEquals(a1.join(), a1.toString()); 45 46 // Non-standard "join" function is called correctly. 47 var a2 = [1, 2, 3]; 48 a2.join = testJoin; 49 expectedThis = a2; 50 assertEquals(success, a2.toString()); 51 52 // Non-callable join function is ignored and Object.prototype.toString is 53 // used instead. 54 var a3 = [1, 2, 3]; 55 a3.join = "not callable"; 56 assertEquals("[object Array]", a3.toString()); 57 58 // Non-existing join function is treated same as non-callable. 59 var a4 = [1, 2, 3]; 60 a4.__proto__ = { toString: Array.prototype.toString }; 61 // No join on Array. 62 assertEquals("[object Array]", a4.toString()); 63 64 65 // On a non-Array object. 66 67 // Default looks-like-an-array case. 68 var o1 = {length: 3, 0: 1, 1: 2, 2: 3, 69 toString: Array.prototype.toString, 70 join: Array.prototype.join}; 71 assertEquals(o1.join(), o1.toString()); 72 73 74 // Non-standard join is called correctly. 75 // Check that we don't read, e.g., length before calling join. 76 var o2 = {toString : Array.prototype.toString, 77 join: testJoin, 78 get length() { assertUnreachable(); }, 79 get 0() { assertUnreachable(); }}; 80 expectedThis = o2; 81 assertEquals(success, o2.toString()); 82 83 // Non-standard join is called even if it looks like an array. 84 var o3 = {length: 3, 0: 1, 1: 2, 2: 3, 85 toString: Array.prototype.toString, 86 join: testJoin}; 87 expectedThis = o3; 88 assertEquals(success, o3.toString()); 89 90 // Non-callable join works same as for Array. 91 var o4 = {length: 3, 0: 1, 1: 2, 2: 3, 92 toString: Array.prototype.toString, 93 join: "not callable"}; 94 assertEquals("[object Object]", o4.toString()); 95 96 97 // Non-existing join works same as for Array. 98 var o5 = {length: 3, 0: 1, 1: 2, 2: 3, 99 toString: Array.prototype.toString 100 /* no join */}; 101 assertEquals("[object Object]", o5.toString()); 102 103 104 // Test that ToObject is called before getting "join", so the instance 105 // that "join" is read from is the same one passed as receiver later. 106 var called_before = false; 107 expectedThis = null; 108 Object.defineProperty(Number.prototype, "join", {get: function() { 109 assertFalse(called_before); 110 called_before = true; 111 expectedThis = this; 112 return testJoin; 113 }}); 114 Number.prototype.arrayToString = Array.prototype.toString; 115 assertEquals(success, (42).arrayToString()); 116 117 // ---------------------------------------------------------- 118 // Testing Array.prototype.toLocaleString 119 120 // Ensure that it never uses Array.prototype.toString for anything. 121 Array.prototype.toString = function() { assertUnreachable(); }; 122 123 // Default case. 124 var la1 = [1, [2, 3], 4]; 125 assertEquals("1,2,3,4", la1.toLocaleString()); 126 127 // Used on a string (which looks like an array of characters). 128 String.prototype.toLocaleString = Array.prototype.toLocaleString; 129 assertEquals("1,2,3,4", "1234".toLocaleString()); 130 131 // If toLocaleString of element is not callable, throw a TypeError. 132 var la2 = [1, {toLocaleString: "not callable"}, 3]; 133 assertThrows(function() { la2.toLocaleString(); }, TypeError); 134 135 // If toLocaleString of element is callable, call it. 136 var la3 = [1, {toLocaleString: function() { return "XX";}}, 3]; 137 assertEquals("1,XX,3", la3.toLocaleString()); 138 139 // Omitted elements, as well as undefined and null, become empty string. 140 var la4 = [1, null, 3, undefined, 5,, 7]; 141 assertEquals("1,,3,,5,,7", la4.toLocaleString()); 142 143 144 // ToObject is called first and the same object is being used for the 145 // rest of the operations. 146 Object.defineProperty(Number.prototype, "length", { 147 get: function() { 148 exptectedThis = this; 149 return 3; 150 }}); 151 for (var i = 0; i < 3; i++) { 152 Object.defineProperty(Number.prototype, i, { 153 get: function() { 154 assertEquals(expectedThis, this); 155 return +this; 156 }}); 157 } 158 Number.prototype.arrayToLocaleString = Array.prototype.toLocaleString; 159 assertEquals("42,42,42", (42).arrayToLocaleString()); 160
