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// Copyright 2022 The Chromium Authors
// 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_PLATFORM_BINDINGS_SYNC_ITERATOR_BASE_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_SYNC_ITERATOR_BASE_H_
#include "third_party/blink/renderer/platform/bindings/script_wrappable.h"
#include "third_party/blink/renderer/platform/heap/member.h"
namespace blink {
class ExceptionState;
namespace bindings {
// SyncIteratorBase is the common base class of all sync iterator classes.
// Most importantly this class provides a way of type dispatching (e.g.
// overload resolutions, SFINAE technique, etc.) so that it's possible to
// distinguish sync iterators from anything else. Also it provides common
// implementation of sync iterators.
class PLATFORM_EXPORT SyncIteratorBase : public ScriptWrappable {
public:
// https://webidl.spec.whatwg.org/#default-iterator-object-kind
enum class Kind {
kKey,
kValue,
kKeyValue,
};
class PLATFORM_EXPORT IterationSourceBase
: public GarbageCollected<IterationSourceBase> {
public:
IterationSourceBase() = default;
virtual ~IterationSourceBase() = default;
IterationSourceBase(const IterationSourceBase&) = delete;
IterationSourceBase& operator=(const IterationSourceBase&) = delete;
virtual v8::Local<v8::Object> Next(ScriptState* script_state,
Kind kind,
ExceptionState& exception_state) = 0;
virtual void Trace(Visitor* visitor) const {}
};
~SyncIteratorBase() override = default;
v8::Local<v8::Object> next(ScriptState* script_state,
ExceptionState& exception_state);
void Trace(Visitor* visitor) const override;
protected:
explicit SyncIteratorBase(IterationSourceBase* iteration_source, Kind kind)
: iteration_source_(iteration_source), kind_(kind) {}
const Member<IterationSourceBase> iteration_source_;
const Kind kind_;
};
} // namespace bindings
// This class template is specialized by the bindings code generator for each
// class T which implements an IDL interface declared to be iterable, maplike,
// or setlike.
template <typename T>
class SyncIterator;
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_SYNC_ITERATOR_BASE_H_
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