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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-iteration |
| 6 |
| 7 |
| 8 function TestStringPrototypeIterator() { |
| 9 assertTrue(String.prototype.hasOwnProperty(Symbol.iterator)); |
| 10 assertFalse("".hasOwnProperty(Symbol.iterator)); |
| 11 assertFalse("".propertyIsEnumerable(Symbol.iterator)); |
| 12 } |
| 13 TestStringPrototypeIterator(); |
| 14 |
| 15 |
| 16 function assertIteratorResult(value, done, result) { |
| 17 assertEquals({value: value, done: done}, result); |
| 18 } |
| 19 |
| 20 |
| 21 function TestManualIteration() { |
| 22 var string = "abc"; |
| 23 var iterator = string[Symbol.iterator](); |
| 24 assertIteratorResult('a', false, iterator.next()); |
| 25 assertIteratorResult('b', false, iterator.next()); |
| 26 assertIteratorResult('c', false, iterator.next()); |
| 27 assertIteratorResult(void 0, true, iterator.next()); |
| 28 assertIteratorResult(void 0, true, iterator.next()); |
| 29 } |
| 30 TestManualIteration(); |
| 31 |
| 32 |
| 33 function TestSurrogatePairs() { |
| 34 var lo = "\uD834"; |
| 35 var hi = "\uDF06"; |
| 36 var pair = lo + hi; |
| 37 var string = "abc" + pair + "def" + lo + pair + hi + lo; |
| 38 var iterator = string[Symbol.iterator](); |
| 39 assertIteratorResult('a', false, iterator.next()); |
| 40 assertIteratorResult('b', false, iterator.next()); |
| 41 assertIteratorResult('c', false, iterator.next()); |
| 42 assertIteratorResult(pair, false, iterator.next()); |
| 43 assertIteratorResult('d', false, iterator.next()); |
| 44 assertIteratorResult('e', false, iterator.next()); |
| 45 assertIteratorResult('f', false, iterator.next()); |
| 46 assertIteratorResult(lo, false, iterator.next()); |
| 47 assertIteratorResult(pair, false, iterator.next()); |
| 48 assertIteratorResult(hi, false, iterator.next()); |
| 49 assertIteratorResult(lo, false, iterator.next()); |
| 50 assertIteratorResult(void 0, true, iterator.next()); |
| 51 assertIteratorResult(void 0, true, iterator.next()); |
| 52 } |
| 53 TestSurrogatePairs(); |
| 54 |
| 55 |
| 56 function TestStringIteratorPrototype() { |
| 57 var iterator = ""[Symbol.iterator](); |
| 58 var StringIteratorPrototype = iterator.__proto__; |
| 59 assertFalse(StringIteratorPrototype.hasOwnProperty('constructor')); |
| 60 assertEquals(StringIteratorPrototype.__proto__, Object.prototype); |
| 61 assertArrayEquals(['next'], |
| 62 Object.getOwnPropertyNames(StringIteratorPrototype)); |
| 63 assertEquals('[object String Iterator]', "" + iterator); |
| 64 } |
| 65 TestStringIteratorPrototype(); |
| 66 |
| 67 |
| 68 function TestForOf() { |
| 69 var lo = "\uD834"; |
| 70 var hi = "\uDF06"; |
| 71 var pair = lo + hi; |
| 72 var string = "abc" + pair + "def" + lo + pair + hi + lo; |
| 73 var expected = ['a', 'b', 'c', pair, 'd', 'e', 'f', lo, pair, hi, lo]; |
| 74 |
| 75 var i = 0; |
| 76 for (var char of string) { |
| 77 assertEquals(expected[i++], char); |
| 78 } |
| 79 |
| 80 assertEquals(expected.length, i); |
| 81 } |
| 82 TestForOf(); |
| 83 |
| 84 |
| 85 function TestNonOwnSlots() { |
| 86 var iterator = ""[Symbol.iterator](); |
| 87 var object = {__proto__: iterator}; |
| 88 |
| 89 assertThrows(function() { |
| 90 object.next(); |
| 91 }, TypeError); |
| 92 } |
| 93 TestNonOwnSlots(); |
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