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// Copyright 2019 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_PLATFORM_BINDINGS_V8_VALUE_OR_SCRIPT_WRAPPABLE_ADAPTER_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_V8_VALUE_OR_SCRIPT_WRAPPABLE_ADAPTER_H_
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/heap/persistent.h"
#include "v8/include/v8.h"
namespace blink {
class ScriptState;
class ScriptWrappable;
namespace bindings {
// V8ValueOrScriptWrappableAdapter is an adapter to make bindings functions take
// either of v8::Local<v8::Value> or ScriptWrappable*.
//
// This class is only designed to be used as function argument types in bindings
// layer. Please refrain from abuse for other purpose and/or outside bindings.
class PLATFORM_EXPORT V8ValueOrScriptWrappableAdapter {
STACK_ALLOCATED();
public:
// Supports implicit conversions from v8::Value and ScriptWrappable type
// family so that the call sites do not need to recognize this helper class.
V8ValueOrScriptWrappableAdapter(std::nullptr_t) {}
V8ValueOrScriptWrappableAdapter(v8::Local<v8::Value> v8_value)
: v8_value_(v8_value) {
DCHECK(!v8_value_.IsEmpty());
}
V8ValueOrScriptWrappableAdapter(ScriptWrappable* script_wrappable)
: script_wrappable_(script_wrappable) {}
template <typename T>
V8ValueOrScriptWrappableAdapter(Persistent<T> script_wrappable)
: script_wrappable_(script_wrappable) {
static_assert(std::is_base_of<ScriptWrappable, T>::value,
"script_wrappable must be a ScriptWrappable");
}
// Returns the specified v8::Value or the V8 wrapper object of the specified
// ScriptWrappable. In the latter case, the wrapper may be created in
// |creation_context|.
v8::Local<v8::Value> V8Value(ScriptState* creation_context) const;
// Returns true when none of v8::Value nor ScriptWrappable is specified.
bool IsEmpty() const { return v8_value_.IsEmpty() && !script_wrappable_; }
private:
v8::Local<v8::Value> v8_value_;
Member<ScriptWrappable> script_wrappable_;
};
} // namespace bindings
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_V8_VALUE_OR_SCRIPT_WRAPPABLE_ADAPTER_H_
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