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// Copyright 2014 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
function TestStringPrototypeIterator() {
assertTrue(String.prototype.hasOwnProperty(Symbol.iterator));
assertFalse("".hasOwnProperty(Symbol.iterator));
assertFalse("".propertyIsEnumerable(Symbol.iterator));
}
TestStringPrototypeIterator();
function assertIteratorResult(value, done, result) {
assertEquals({value: value, done: done}, result);
}
function TestManualIteration() {
var string = "abc";
var iterator = string[Symbol.iterator]();
assertIteratorResult('a', false, iterator.next());
assertIteratorResult('b', false, iterator.next());
assertIteratorResult('c', false, iterator.next());
assertIteratorResult(void 0, true, iterator.next());
assertIteratorResult(void 0, true, iterator.next());
}
TestManualIteration();
function TestSurrogatePairs() {
var lo = "\uD834";
var hi = "\uDF06";
var pair = lo + hi;
var string = "abc" + pair + "def" + lo + pair + hi + lo;
var iterator = string[Symbol.iterator]();
assertIteratorResult('a', false, iterator.next());
assertIteratorResult('b', false, iterator.next());
assertIteratorResult('c', false, iterator.next());
assertIteratorResult(pair, false, iterator.next());
assertIteratorResult('d', false, iterator.next());
assertIteratorResult('e', false, iterator.next());
assertIteratorResult('f', false, iterator.next());
assertIteratorResult(lo, false, iterator.next());
assertIteratorResult(pair, false, iterator.next());
assertIteratorResult(hi, false, iterator.next());
assertIteratorResult(lo, false, iterator.next());
assertIteratorResult(void 0, true, iterator.next());
assertIteratorResult(void 0, true, iterator.next());
}
TestSurrogatePairs();
function TestStringIteratorPrototype() {
var iterator = ""[Symbol.iterator]();
var StringIteratorPrototype = iterator.__proto__;
assertFalse(StringIteratorPrototype.hasOwnProperty('constructor'));
assertEquals(StringIteratorPrototype.__proto__, Object.prototype);
assertArrayEquals(['next'],
Object.getOwnPropertyNames(StringIteratorPrototype));
assertEquals('[object String Iterator]', "" + iterator);
assertEquals("String Iterator", StringIteratorPrototype[Symbol.toStringTag]);
var desc = Object.getOwnPropertyDescriptor(
StringIteratorPrototype, Symbol.toStringTag);
assertTrue(desc.configurable);
assertFalse(desc.writable);
assertEquals("String Iterator", desc.value);
}
TestStringIteratorPrototype();
function TestForOf() {
var lo = "\uD834";
var hi = "\uDF06";
var pair = lo + hi;
var string = "abc" + pair + "def" + lo + pair + hi + lo;
var expected = ['a', 'b', 'c', pair, 'd', 'e', 'f', lo, pair, hi, lo];
var i = 0;
for (var char of string) {
assertEquals(expected[i++], char);
}
assertEquals(expected.length, i);
}
TestForOf();
function TestNonOwnSlots() {
var iterator = ""[Symbol.iterator]();
var object = {__proto__: iterator};
assertThrows(function() { object.next(); }, TypeError);
}
TestNonOwnSlots();
function TestSlicedStringRegression() {
var long_string = "abcdefhijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
var sliced_string = long_string.substring(1);
var iterator = sliced_string[Symbol.iterator]();
}
TestSlicedStringRegression();
(function(){
var str = "\uD83C\uDF1F\u5FCD\u8005\u306E\u653B\u6483\uD83C\uDF1F";
var arr = [...str];
assertEquals(["\uD83C\uDF1F", "\u5FCD", "\u8005", "\u306E", "\u653B",
"\u6483", "\uD83C\uDF1F"], arr);
assertEquals(7, arr.length);
})();
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