1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_BINDINGS_CORE_V8_ITERABLE_H_
#define THIRD_PARTY_BLINK_RENDERER_BINDINGS_CORE_V8_ITERABLE_H_
#include "third_party/blink/renderer/bindings/core/v8/v8_for_each_iterator_callback.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_iterator_result_value.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_script_runner.h"
#include "third_party/blink/renderer/core/dom/iterator.h"
#include "third_party/blink/renderer/core/execution_context/execution_context.h"
#include "third_party/blink/renderer/platform/bindings/exception_state.h"
namespace blink {
// Typically, you should use PairIterable<> (below) instead.
// Also, note that value iterators are set up automatically by the bindings
// code and the operations below come directly from V8.
template <typename KeyType, typename ValueType>
class Iterable {
public:
Iterator* keysForBinding(ScriptState* script_state,
ExceptionState& exception_state) {
IterationSource* source =
this->StartIteration(script_state, exception_state);
if (!source)
return nullptr;
return MakeGarbageCollected<IterableIterator<KeySelector>>(source);
}
Iterator* valuesForBinding(ScriptState* script_state,
ExceptionState& exception_state) {
IterationSource* source =
this->StartIteration(script_state, exception_state);
if (!source)
return nullptr;
return MakeGarbageCollected<IterableIterator<ValueSelector>>(source);
}
Iterator* entriesForBinding(ScriptState* script_state,
ExceptionState& exception_state) {
IterationSource* source =
this->StartIteration(script_state, exception_state);
if (!source)
return nullptr;
return MakeGarbageCollected<IterableIterator<EntrySelector>>(source);
}
void forEachForBinding(ScriptState* script_state,
const ScriptValue& this_value,
V8ForEachIteratorCallback* callback,
const ScriptValue& this_arg,
ExceptionState& exception_state) {
IterationSource* source =
this->StartIteration(script_state, exception_state);
v8::TryCatch try_catch(script_state->GetIsolate());
v8::Local<v8::Value> v8_callback_this_value = this_arg.V8Value();
v8::Local<v8::Value> v8_value;
v8::Local<v8::Value> v8_key;
while (true) {
KeyType key;
ValueType value;
if (!source->Next(script_state, key, value, exception_state))
break;
DCHECK(!exception_state.HadException());
v8_value = ToV8(value, script_state);
v8_key = ToV8(key, script_state);
if (try_catch.HasCaught()) {
exception_state.RethrowV8Exception(try_catch.Exception());
return;
}
if (callback
->Invoke(v8_callback_this_value,
ScriptValue(script_state->GetIsolate(), v8_value),
ScriptValue(script_state->GetIsolate(), v8_key),
this_value)
.IsNothing()) {
exception_state.RethrowV8Exception(try_catch.Exception());
return;
}
}
}
class IterationSource : public GarbageCollected<IterationSource> {
public:
virtual ~IterationSource() = default;
// If end of iteration has been reached or an exception thrown: return
// false. Otherwise: set |key| and |value| and return true.
virtual bool Next(ScriptState*, KeyType&, ValueType&, ExceptionState&) = 0;
virtual void Trace(blink::Visitor* visitor) {}
};
private:
virtual IterationSource* StartIteration(ScriptState*, ExceptionState&) = 0;
struct KeySelector {
STATIC_ONLY(KeySelector);
static const KeyType& Select(ScriptState*,
const KeyType& key,
const ValueType& value) {
return key;
}
};
struct ValueSelector {
STATIC_ONLY(ValueSelector);
static const ValueType& Select(ScriptState*,
const KeyType& key,
const ValueType& value) {
return value;
}
};
struct EntrySelector {
STATIC_ONLY(EntrySelector);
static HeapVector<ScriptValue, 2> Select(ScriptState* script_state,
const KeyType& key,
const ValueType& value) {
v8::Local<v8::Object> creation_context =
script_state->GetContext()->Global();
v8::Isolate* isolate = script_state->GetIsolate();
HeapVector<ScriptValue, 2> entry;
entry.push_back(
ScriptValue(isolate, ToV8(key, creation_context, isolate)));
entry.push_back(
ScriptValue(isolate, ToV8(value, creation_context, isolate)));
return entry;
}
};
template <typename Selector>
class IterableIterator final : public Iterator {
public:
explicit IterableIterator(IterationSource* source) : source_(source) {}
ScriptValue next(ScriptState* script_state,
ExceptionState& exception_state) override {
KeyType key;
ValueType value;
if (!source_->Next(script_state, key, value, exception_state))
return V8IteratorResultDone(script_state);
return V8IteratorResult(script_state,
Selector::Select(script_state, key, value));
}
ScriptValue next(ScriptState* script_state,
ScriptValue,
ExceptionState& exception_state) override {
return next(script_state, exception_state);
}
void Trace(blink::Visitor* visitor) override {
visitor->Trace(source_);
Iterator::Trace(visitor);
}
private:
Member<IterationSource> source_;
};
};
// Utiltity mixin base-class for classes implementing IDL interfaces with
// "iterable<T1, T2>" or "maplike<T1, T2>".
template <typename KeyType, typename ValueType>
class PairIterable : public Iterable<KeyType, ValueType> {
public:
Iterator* GetIterator(ScriptState* script_state,
ExceptionState& exception_state) {
return this->entriesForBinding(script_state, exception_state);
}
};
// Utiltity mixin base-class for classes implementing IDL interfaces with
// "setlike<V>" (not "iterable<V>").
// IDL interfaces with "iterable<V>" (value iterators) inherit @@iterator,
// values(), entries(), keys() and forEach() from the %ArrayPrototype%
// intrinsic object automatically.
template <typename ValueType>
class SetlikeIterable : public Iterable<ValueType, ValueType> {
public:
Iterator* GetIterator(ScriptState* script_state,
ExceptionState& exception_state) {
return this->valuesForBinding(script_state, exception_state);
}
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_BINDINGS_CORE_V8_ITERABLE_H_
|
