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