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/global_env.h"
20 #include "ecmascript/js_api/js_api_deque.h"
21 #include "ecmascript/js_iterator.h"
22 #include "ecmascript/js_tagged_value-inl.h"
23
24 namespace panda::ecmascript {
25 using BuiltinsBase = base::BuiltinsBase;
26 using ContainerError = containers::ContainerError;
27 using ErrorFlag = containers::ErrorFlag;
28 // DequeIteratorPrototype%.next ( )
Next(EcmaRuntimeCallInfo * argv)29 JSTaggedValue JSAPIDequeIterator::Next(EcmaRuntimeCallInfo *argv)
30 {
31 ASSERT(argv);
32 JSThread *thread = argv->GetThread();
33 [[maybe_unused]] EcmaHandleScope handleScope(thread);
34 JSHandle<JSTaggedValue> input(BuiltinsBase::GetThis(argv));
35
36 if (!input->IsJSAPIDequeIterator()) {
37 JSTaggedValue error = ContainerError::BusinessError(thread, ErrorFlag::BIND_ERROR,
38 "The Symbol.iterator method cannot be bound");
39 THROW_NEW_ERROR_AND_RETURN_VALUE(thread, error, JSTaggedValue::Exception());
40 }
41 JSHandle<JSAPIDequeIterator> iter(input);
42 JSHandle<JSTaggedValue> iteratorDeque(thread, iter->GetIteratedDeque(thread));
43 if (iteratorDeque->IsUndefined()) {
44 JSHandle<GlobalEnv> env = thread->GetEcmaVM()->GetGlobalEnv();
45 return env->GetUndefinedIteratorResult().GetTaggedValue();
46 }
47 JSHandle<JSAPIDeque> deque = JSHandle<JSAPIDeque>::Cast(iteratorDeque);
48 uint32_t index = iter->GetNextIndex();
49
50 JSHandle<TaggedArray> elements(thread, deque->GetElements(thread));
51 uint32_t capacity = elements->GetLength();
52 uint32_t first = deque->GetFirst();
53 uint32_t last = deque->GetLast();
54 if (index == last) {
55 JSHandle<JSTaggedValue> undefinedHandle = thread->GlobalConstants()->GetHandledUndefined();
56 iter->SetIteratedDeque(thread, undefinedHandle);
57 JSHandle<GlobalEnv> env = thread->GetEcmaVM()->GetGlobalEnv();
58 return env->GetUndefinedIteratorResult().GetTaggedValue();
59 }
60 ASSERT(capacity != 0);
61 iter->SetNextIndex((index + 1) % capacity);
62 uint32_t elementIndex = (index + capacity - first) % capacity;
63 JSHandle<JSTaggedValue> value(thread, JSHandle<JSAPIDeque>::Cast(iteratorDeque)->Get(thread, elementIndex));
64
65 return JSIterator::CreateIterResultObject(thread, value, false).GetTaggedValue();
66 }
67 } // namespace panda::ecmascript
68