1 /*
2 * Copyright (c) 2021 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include "ecmascript/js_array_iterator.h"
17
18 #include "ecmascript/base/typed_array_helper-inl.h"
19 #include "ecmascript/js_array.h"
20
21 namespace panda::ecmascript {
22 using BuiltinsBase = base::BuiltinsBase;
23 // 22.1.5.2.1 %ArrayIteratorPrototype%.next ( )
Next(EcmaRuntimeCallInfo * argv)24 JSTaggedValue JSArrayIterator::Next(EcmaRuntimeCallInfo *argv)
25 {
26 ASSERT(argv);
27 JSThread *thread = argv->GetThread();
28 [[maybe_unused]] EcmaHandleScope handleScope(thread);
29 // 1.Let O be the this value.
30 JSHandle<JSTaggedValue> thisObj(BuiltinsBase::GetThis(argv));
31 return NextInternal(thread, thisObj);
32 }
33
NextInternal(JSThread * thread,JSHandle<JSTaggedValue> thisObj)34 JSTaggedValue JSArrayIterator::NextInternal(JSThread *thread, JSHandle<JSTaggedValue> thisObj)
35 {
36 // 2.If Type(O) is not Object, throw a TypeError exception.
37 // 3.If O does not have all of the internal slots of an TaggedArray Iterator Instance (22.1.5.3), throw a TypeError
38 // exception.
39 if (!thisObj->IsJSArrayIterator()) {
40 THROW_TYPE_ERROR_AND_RETURN(thread, "this value is not an array iterator", JSTaggedValue::Exception());
41 }
42 JSHandle<JSArrayIterator> iter(thisObj);
43 // 4.Let a be O.[[IteratedArrayLike]].
44 JSHandle<JSTaggedValue> array(thread, iter->GetIteratedArray(thread));
45 JSHandle<JSTaggedValue> undefinedHandle(thread, JSTaggedValue::Undefined());
46 // 5.If a is undefined, return CreateIterResultObject(undefined, true).
47 if (array->IsUndefined()) {
48 return JSIterator::CreateIterResultObject(thread, undefinedHandle, true).GetTaggedValue();
49 }
50 // 6.Let index be O.[[ArrayLikeNextIndex]].
51 uint32_t index = iter->GetNextIndex();
52 // 7.Let itemKind be O.[[ArrayLikeIterationKind]].
53 IterationKind itemKind = iter->GetIterationKind();
54
55 uint32_t length;
56 // 8. If a has a [[TypedArrayName]] internal slot, then
57 // a. Let len be the value of O’s [[ArrayLength]] internal slot.
58 if (array->IsTypedArray()) {
59 length = JSHandle<JSTypedArray>::Cast(array)->GetArrayLength();
60 } else if (array->IsJSArray()) {
61 length = JSHandle<JSArray>(array)->GetArrayLength();
62 } else {
63 // 9.Else
64 JSHandle<JSTaggedValue> lengthKey = thread->GlobalConstants()->GetHandledLengthString();
65 auto lengthProperty = JSTaggedValue::GetProperty(thread, array, lengthKey);
66 RETURN_EXCEPTION_IF_ABRUPT_COMPLETION(thread);
67 auto lengthValue = JSTaggedValue::ToLength(thread, lengthProperty.GetValue());
68 RETURN_EXCEPTION_IF_ABRUPT_COMPLETION(thread);
69 length = lengthValue.ToUint32();
70 }
71
72 // 10.If index ≥ len, then
73 if (index >= length) {
74 // Set O.[[IteratedArrayLike]] to undefined.
75 // Return CreateIterResultObject(undefined, true).
76 iter->SetIteratedArray(thread, undefinedHandle);
77 return JSIterator::CreateIterResultObject(thread, undefinedHandle, true).GetTaggedValue();
78 }
79 // 11.Set O.[[ArrayLikeNextIndex]] to index + 1.
80 iter->SetNextIndex(index + 1);
81 // 12.If itemKind is key, return CreateIterResultObject(index, false).
82 JSHandle<JSTaggedValue> key(thread, JSTaggedValue(index));
83 if (itemKind == IterationKind::KEY) {
84 return JSIterator::CreateIterResultObject(thread, key, false).GetTaggedValue();
85 }
86 JSHandle<JSTaggedValue> value = JSArray::FastGetPropertyByValue(thread, array, index);
87 RETURN_EXCEPTION_IF_ABRUPT_COMPLETION(thread);
88 // 15.If itemKind is value, let result be elementValue.
89 if (itemKind == IterationKind::VALUE) {
90 return JSIterator::CreateIterResultObject(thread, value, false).GetTaggedValue();
91 }
92 // 16. Else
93 ASSERT_PRINT(itemKind == IterationKind::KEY_AND_VALUE, "itemKind is invalid");
94 ObjectFactory *factory = thread->GetEcmaVM()->GetFactory();
95 JSHandle<TaggedArray> resultArray(factory->NewTaggedArray(2)); // 2 means the length of array
96 resultArray->Set(thread, 0, key);
97 resultArray->Set(thread, 1, value);
98 JSHandle<JSTaggedValue> keyAndValue(JSArray::CreateArrayFromList(thread, resultArray));
99 return JSIterator::CreateIterResultObject(thread, keyAndValue, false).GetTaggedValue();
100 }
101 } // namespace panda::ecmascript
102