Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 1 | // Copyright 2009 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 ES5 sections 15.2.3.5 Object.create. |
| 29 | // We do not support nonconfigurable properties on objects so that is not |
| 30 | // tested. We do test getters, setters, writable, enumerable and value. |
| 31 | |
| 32 | // Check that no exceptions are thrown. |
| 33 | Object.create(null); |
| 34 | Object.create(null, undefined); |
| 35 | |
| 36 | // Check that the right exception is thrown. |
| 37 | try { |
| 38 | Object.create(4); |
| 39 | assertTrue(false); |
| 40 | } catch (e) { |
| 41 | assertTrue(/Object or null/.test(e)); |
| 42 | } |
| 43 | |
| 44 | try { |
| 45 | Object.create("foo"); |
| 46 | print(2); |
| 47 | assertTrue(false); |
| 48 | } catch (e) { |
| 49 | assertTrue(/Object or null/.test(e)); |
| 50 | } |
| 51 | |
| 52 | var ctr = 0; |
| 53 | var ctr2 = 0; |
| 54 | var ctr3 = 0; |
| 55 | var ctr4 = 0; |
| 56 | var ctr5 = 0; |
| 57 | var ctr6 = 1000; |
| 58 | |
| 59 | var protoFoo = { foo: function() { ctr++; }}; |
| 60 | var fooValue = { foo: { writable: true, value: function() { ctr2++; }}}; |
| 61 | var fooGetter = { foo: { get: function() { return ctr3++; }}}; |
| 62 | var fooSetter = { foo: { set: function() { return ctr4++; }}}; |
| 63 | var fooAmbiguous = { foo: { get: function() { return ctr3++; }, |
| 64 | value: 3 }}; |
| 65 | |
| 66 | function valueGet() { ctr5++; return 3 }; |
| 67 | function getterGet() { ctr5++; return function() { return ctr6++; }; }; |
| 68 | |
| 69 | // Simple object with prototype, no properties added. |
| 70 | Object.create(protoFoo).foo(); |
| 71 | assertEquals(1, ctr); |
| 72 | |
| 73 | // Simple object with object with prototype, no properties added. |
| 74 | Object.create(Object.create(protoFoo)).foo(); |
| 75 | assertEquals(2, ctr); |
| 76 | |
| 77 | // Add a property foo that returns a function. |
| 78 | var v = Object.create(protoFoo, fooValue); |
| 79 | v.foo(); |
| 80 | assertEquals(2, ctr); |
| 81 | assertEquals(1, ctr2); |
| 82 | |
| 83 | // Ensure the property is writable. |
| 84 | v.foo = 42; |
| 85 | assertEquals(42, v.foo); |
| 86 | assertEquals(2, ctr); |
| 87 | assertEquals(1, ctr2); |
| 88 | |
| 89 | // Ensure by default properties are not writable. |
| 90 | v = Object.create(null, { foo: {value: 103}}); |
| 91 | assertEquals(103, v.foo); |
| 92 | v.foo = 42; |
| 93 | assertEquals(103, v.foo); |
| 94 | |
| 95 | // Add a getter foo that returns a counter value. |
| 96 | assertEquals(0, Object.create(protoFoo, fooGetter).foo); |
| 97 | assertEquals(2, ctr); |
| 98 | assertEquals(1, ctr2); |
| 99 | assertEquals(1, ctr3); |
| 100 | |
| 101 | // Add a setter foo that runs a function. |
| 102 | assertEquals(1, Object.create(protoFoo, fooSetter).foo = 1); |
| 103 | assertEquals(2, ctr); |
| 104 | assertEquals(1, ctr2); |
| 105 | assertEquals(1, ctr3); |
| 106 | assertEquals(1, ctr4); |
| 107 | |
| 108 | // Make sure that trying to add both a value and a getter |
| 109 | // will result in an exception. |
| 110 | try { |
| 111 | Object.create(protoFoo, fooAmbiguous); |
| 112 | assertTrue(false); |
| 113 | } catch (e) { |
| 114 | assertTrue(/Invalid property/.test(e)); |
| 115 | } |
| 116 | assertEquals(2, ctr); |
| 117 | assertEquals(1, ctr2); |
| 118 | assertEquals(1, ctr3); |
| 119 | assertEquals(1, ctr4); |
| 120 | |
| 121 | var ctr7 = 0; |
| 122 | |
| 123 | var metaProps = { |
| 124 | enumerable: { get: function() { |
| 125 | assertEquals(0, ctr7++); |
| 126 | return true; |
| 127 | }}, |
| 128 | configurable: { get: function() { |
| 129 | assertEquals(1, ctr7++); |
| 130 | return true; |
| 131 | }}, |
| 132 | value: { get: function() { |
| 133 | assertEquals(2, ctr7++); |
| 134 | return 4; |
| 135 | }}, |
| 136 | writable: { get: function() { |
| 137 | assertEquals(3, ctr7++); |
| 138 | return true; |
| 139 | }}, |
| 140 | get: { get: function() { |
| 141 | assertEquals(4, ctr7++); |
| 142 | return function() { }; |
| 143 | }}, |
| 144 | set: { get: function() { |
| 145 | assertEquals(5, ctr7++); |
| 146 | return function() { }; |
| 147 | }} |
| 148 | }; |
| 149 | |
| 150 | |
| 151 | // Instead of a plain props object, let's use getters to return its properties. |
| 152 | var magicValueProps = { foo: Object.create(null, { value: { get: valueGet }})}; |
| 153 | var magicGetterProps = { foo: Object.create(null, { get: { get: getterGet }})}; |
| 154 | var magicAmbiguousProps = { foo: Object.create(null, metaProps) }; |
| 155 | |
| 156 | assertEquals(3, Object.create(null, magicValueProps).foo); |
| 157 | assertEquals(1, ctr5); |
| 158 | |
| 159 | assertEquals(1000, Object.create(null, magicGetterProps).foo); |
| 160 | assertEquals(2, ctr5); |
| 161 | |
| 162 | // See if we do the steps in ToPropertyDescriptor in the right order. |
| 163 | // We shouldn't throw the exception for an ambiguous properties object |
| 164 | // before we got all the values out. |
| 165 | try { |
| 166 | Object.create(null, magicAmbiguousProps); |
| 167 | assertTrue(false); |
| 168 | } catch (e) { |
| 169 | assertTrue(/Invalid property/.test(e)); |
| 170 | assertEquals(6, ctr7); |
| 171 | } |
| 172 | |
| 173 | var magicWritableProps = { |
| 174 | foo: Object.create(null, { value: { value: 4 }, |
| 175 | writable: { get: function() { |
| 176 | ctr6++; |
| 177 | return false; |
| 178 | }}})}; |
| 179 | |
| 180 | var fooNotWritable = Object.create(null, magicWritableProps) |
| 181 | assertEquals(1002, ctr6); |
| 182 | assertEquals(4, fooNotWritable.foo); |
| 183 | fooNotWritable.foo = 5; |
| 184 | assertEquals(4, fooNotWritable.foo); |
| 185 | |
| 186 | |
| 187 | // Test enumerable flag. |
| 188 | |
| 189 | var fooNotEnumerable = |
| 190 | Object.create({fizz: 14}, {foo: {value: 3, enumerable: false}, |
| 191 | bar: {value: 4, enumerable: true}, |
| 192 | baz: {value: 5}}); |
| 193 | var sum = 0; |
| 194 | for (x in fooNotEnumerable) { |
| 195 | assertTrue(x === 'bar' || x === 'fizz'); |
| 196 | sum += fooNotEnumerable[x]; |
| 197 | } |
| 198 | assertEquals(18, sum); |
| 199 | |
| 200 | |
| 201 | try { |
| 202 | Object.create(null, {foo: { get: 0 }}); |
| 203 | assertTrue(false); |
| 204 | } catch (e) { |
| 205 | assertTrue(/Getter must be a function/.test(e)); |
| 206 | } |
| 207 | |
| 208 | try { |
| 209 | Object.create(null, {foo: { set: 0 }}); |
| 210 | assertTrue(false); |
| 211 | } catch (e) { |
| 212 | assertTrue(/Setter must be a function/.test(e)); |
| 213 | } |
| 214 | |
| 215 | try { |
| 216 | Object.create(null, {foo: { set: 0, get: 0 }}); |
| 217 | assertTrue(false); |
| 218 | } catch (e) { |
| 219 | assertTrue(/Getter must be a function/.test(e)); |
| 220 | } |
| 221 | |
| 222 | |
| 223 | // Ensure that only enumerable own properties on the descriptor are used. |
| 224 | var tricky = Object.create( |
| 225 | { foo: { value: 1, enumerable: true }}, |
| 226 | { bar: { value: { value: 2, enumerable: true }, enumerable: false }, |
| 227 | baz: { value: { value: 4, enumerable: false }, enumerable: true }, |
| 228 | fizz: { value: { value: 8, enumerable: false }, enumerable: false }, |
| 229 | buzz: { value: { value: 16, enumerable: true }, enumerable: true }}); |
| 230 | |
| 231 | assertEquals(1, tricky.foo.value); |
| 232 | assertEquals(2, tricky.bar.value); |
| 233 | assertEquals(4, tricky.baz.value); |
| 234 | assertEquals(8, tricky.fizz.value); |
| 235 | assertEquals(16, tricky.buzz.value); |
| 236 | |
| 237 | var sonOfTricky = Object.create(null, tricky); |
| 238 | |
| 239 | assertFalse("foo" in sonOfTricky); |
| 240 | assertFalse("bar" in sonOfTricky); |
| 241 | assertTrue("baz" in sonOfTricky); |
| 242 | assertFalse("fizz" in sonOfTricky); |
| 243 | assertTrue("buzz" in sonOfTricky); |
| 244 | |
| 245 | var sum = 0; |
| 246 | for (x in sonOfTricky) { |
| 247 | assertTrue(x === 'buzz'); |
| 248 | sum += sonOfTricky[x]; |
| 249 | } |
| 250 | assertEquals(16, sum); |