1 /*
2 * Copyright (c) 2022 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_api/js_api_deque_iterator.h"
17
18 #include "ecmascript/containers/containers_errors.h"
19 #include "ecmascript/js_api/js_api_deque.h"
20 #include "ecmascript/js_iterator.h"
21 #include "ecmascript/js_tagged_value-inl.h"
22
23 namespace panda::ecmascript {
24 using BuiltinsBase = base::BuiltinsBase;
25 using ContainerError = containers::ContainerError;
26 using ErrorFlag = containers::ErrorFlag;
27 // DequeIteratorPrototype%.next ( )
Next(EcmaRuntimeCallInfo * argv)28 JSTaggedValue JSAPIDequeIterator::Next(EcmaRuntimeCallInfo *argv)
29 {
30 ASSERT(argv);
31 JSThread *thread = argv->GetThread();
32 [[maybe_unused]] EcmaHandleScope handleScope(thread);
33 JSHandle<JSTaggedValue> input(BuiltinsBase::GetThis(argv));
34
35 if (!input->IsJSAPIDequeIterator()) {
36 JSTaggedValue error = ContainerError::BusinessError(thread, ErrorFlag::BIND_ERROR,
37 "The Symbol.iterator method cannot be bound");
38 THROW_NEW_ERROR_AND_RETURN_VALUE(thread, error, JSTaggedValue::Exception());
39 }
40 JSHandle<JSAPIDequeIterator> iter(input);
41 JSHandle<JSTaggedValue> iteratorDeque(thread, iter->GetIteratedDeque());
42 const GlobalEnvConstants *globalConst = thread->GlobalConstants();
43 if (iteratorDeque->IsUndefined()) {
44 return globalConst->GetUndefinedIterResult();
45 }
46 JSHandle<JSAPIDeque> deque = JSHandle<JSAPIDeque>::Cast(iteratorDeque);
47 uint32_t index = iter->GetNextIndex();
48
49 JSHandle<TaggedArray> elements(thread, deque->GetElements());
50 uint32_t capacity = elements->GetLength();
51 uint32_t first = deque->GetFirst();
52 uint32_t last = deque->GetLast();
53 if (index == last) {
54 JSHandle<JSTaggedValue> undefinedHandle = globalConst->GetHandledUndefined();
55 iter->SetIteratedDeque(thread, undefinedHandle);
56 return globalConst->GetUndefinedIterResult();
57 }
58 ASSERT(capacity != 0);
59 iter->SetNextIndex((index + 1) % capacity);
60 uint32_t elementIndex = (index + capacity - first) % capacity;
61 JSHandle<JSTaggedValue> value(thread, JSHandle<JSAPIDeque>::Cast(iteratorDeque)->Get(elementIndex));
62
63 return JSIterator::CreateIterResultObject(thread, value, false).GetTaggedValue();
64 }
65 } // namespace panda::ecmascript
66