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/base/builtins_base.h"
19 #include "ecmascript/containers/containers_errors.h"
20 #include "ecmascript/global_env_constants-inl.h"
21 #include "ecmascript/js_api/js_api_deque.h"
22 #include "ecmascript/js_handle.h"
23 #include "ecmascript/js_iterator.h"
24 #include "ecmascript/js_handle.h"
25 #include "ecmascript/js_tagged_value-inl.h"
26 #include "ecmascript/js_thread.h"
27 #include "ecmascript/tagged_array.h"
28
29 namespace panda::ecmascript {
30 using BuiltinsBase = base::BuiltinsBase;
31 using ContainerError = containers::ContainerError;
32 using ErrorFlag = containers::ErrorFlag;
33 // DequeIteratorPrototype%.next ( )
Next(EcmaRuntimeCallInfo * argv)34 JSTaggedValue JSAPIDequeIterator::Next(EcmaRuntimeCallInfo *argv)
35 {
36 ASSERT(argv);
37 JSThread *thread = argv->GetThread();
38 [[maybe_unused]] EcmaHandleScope handleScope(thread);
39 JSHandle<JSTaggedValue> input(BuiltinsBase::GetThis(argv));
40
41 if (!input->IsJSAPIDequeIterator()) {
42 JSTaggedValue error = ContainerError::BusinessError(thread, ErrorFlag::BIND_ERROR,
43 "The Symbol.iterator method cannot be bound");
44 THROW_NEW_ERROR_AND_RETURN_VALUE(thread, error, JSTaggedValue::Exception());
45 }
46 JSHandle<JSAPIDequeIterator> iter(input);
47 JSHandle<JSTaggedValue> iteratorDeque(thread, iter->GetIteratedDeque());
48 const GlobalEnvConstants *globalConst = thread->GlobalConstants();
49 if (iteratorDeque->IsUndefined()) {
50 return globalConst->GetUndefinedIterResult();
51 }
52 JSHandle<JSAPIDeque> deque = JSHandle<JSAPIDeque>::Cast(iteratorDeque);
53 uint32_t index = iter->GetNextIndex();
54
55 JSHandle<TaggedArray> elements(thread, deque->GetElements());
56 uint32_t capacity = elements->GetLength();
57 uint32_t first = deque->GetFirst();
58 uint32_t last = deque->GetLast();
59 if (index == last) {
60 JSHandle<JSTaggedValue> undefinedHandle = globalConst->GetHandledUndefined();
61 iter->SetIteratedDeque(thread, undefinedHandle);
62 return globalConst->GetUndefinedIterResult();
63 }
64 ASSERT(capacity != 0);
65 iter->SetNextIndex((index + 1) % capacity);
66 uint32_t elementIndex = (index + capacity - first) % capacity;
67 JSHandle<JSTaggedValue> value(thread, JSHandle<JSAPIDeque>::Cast(iteratorDeque)->Get(elementIndex));
68
69 return JSIterator::CreateIterResultObject(thread, value, false).GetTaggedValue();
70 }
71 } // namespace panda::ecmascript
72