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_tree_map_iterator.h"
17
18 #include "ecmascript/containers/containers_errors.h"
19 #include "ecmascript/js_api/js_api_tree_map.h"
20 #include "ecmascript/js_array.h"
21 #include "ecmascript/tagged_tree.h"
22
23 namespace panda::ecmascript {
24 using BuiltinsBase = base::BuiltinsBase;
25 using ContainerError = containers::ContainerError;
26 using ErrorFlag = containers::ErrorFlag;
Next(EcmaRuntimeCallInfo * argv)27 JSTaggedValue JSAPITreeMapIterator::Next(EcmaRuntimeCallInfo *argv)
28 {
29 ASSERT(argv);
30 JSThread *thread = argv->GetThread();
31 [[maybe_unused]] EcmaHandleScope handleScope(thread);
32 // Let input be the this value
33 JSHandle<JSTaggedValue> input(BuiltinsBase::GetThis(argv));
34
35 if (!input->IsJSAPITreeMapIterator()) {
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<JSAPITreeMapIterator> iter(input);
41 // Let it be [[IteratedMap]].
42 JSHandle<JSTaggedValue> iteratedMap(thread, iter->GetIteratedMap());
43
44 // If it is undefined, return undefinedIteratorResult.
45 const GlobalEnvConstants *globalConst = thread->GlobalConstants();
46 if (iteratedMap->IsUndefined()) {
47 return globalConst->GetUndefinedIterResult();
48 }
49 JSHandle<TaggedTreeMap> map(thread, JSHandle<JSAPITreeMap>::Cast(iteratedMap)->GetTreeMap());
50 uint32_t elements = static_cast<uint32_t>(map->NumberOfElements());
51
52 JSMutableHandle<TaggedArray> entries(thread, iter->GetEntries());
53 if ((iter->GetEntries().IsHole()) || (elements != entries->GetLength())) {
54 entries.Update(TaggedTreeMap::GetArrayFromMap(thread, map).GetTaggedValue());
55 iter->SetEntries(thread, entries);
56 }
57
58 // Let index be Map.[[NextIndex]].
59 uint32_t index = static_cast<uint32_t>(iter->GetNextIndex());
60 if (index < elements) {
61 IterationKind itemKind = IterationKind(iter->GetIterationKind());
62
63 int keyIndex = entries->Get(index).GetInt();
64 iter->SetNextIndex(index + 1);
65
66 JSHandle<JSTaggedValue> key(thread, map->GetKey(keyIndex));
67 // If itemKind is key, let result be e.[[Key]]
68 if (itemKind == IterationKind::KEY) {
69 return JSIterator::CreateIterResultObject(thread, key, false).GetTaggedValue();
70 }
71 JSHandle<JSTaggedValue> value(thread, map->GetValue(keyIndex));
72 // Else if itemKind is value, let result be e.[[Value]].
73 if (itemKind == IterationKind::VALUE) {
74 return JSIterator::CreateIterResultObject(thread, value, false).GetTaggedValue();
75 }
76 ObjectFactory *factory = thread->GetEcmaVM()->GetFactory();
77 JSHandle<TaggedArray> array = factory->NewTaggedArray(2); // 2 means the length of array
78 array->Set(thread, 0, key);
79 array->Set(thread, 1, value);
80 JSHandle<JSTaggedValue> keyAndValue(JSArray::CreateArrayFromList(thread, array));
81 return JSIterator::CreateIterResultObject(thread, keyAndValue, false).GetTaggedValue();
82 }
83
84 // Set [[IteratedMap]] to undefined.
85 iter->SetIteratedMap(thread, JSTaggedValue::Undefined());
86 return globalConst->GetUndefinedIterResult();
87 }
88
CreateTreeMapIterator(JSThread * thread,JSHandle<JSTaggedValue> & obj,IterationKind kind)89 JSHandle<JSTaggedValue> JSAPITreeMapIterator::CreateTreeMapIterator(JSThread *thread,
90 JSHandle<JSTaggedValue> &obj,
91 IterationKind kind)
92 {
93 ObjectFactory *factory = thread->GetEcmaVM()->GetFactory();
94 if (!obj->IsJSAPITreeMap()) {
95 if (obj->IsJSProxy() && JSHandle<JSProxy>::Cast(obj)->GetTarget().IsJSAPITreeMap()) {
96 obj = JSHandle<JSTaggedValue>(thread, JSHandle<JSProxy>::Cast(obj)->GetTarget());
97 } else {
98 JSTaggedValue error = ContainerError::BusinessError(thread, ErrorFlag::BIND_ERROR,
99 "The Symbol.iterator method cannot be bound");
100 THROW_NEW_ERROR_AND_RETURN_VALUE(thread, error,
101 JSHandle<JSTaggedValue>(thread, JSTaggedValue::Exception()));
102 }
103 }
104 JSHandle<JSTaggedValue> iter(factory->NewJSAPITreeMapIterator(JSHandle<JSAPITreeMap>(obj), kind));
105 return iter;
106 }
107 } // namespace panda::ecmascript
108