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/*
* Copyright (C) 2008, 2009 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_BINDINGS_CORE_V8_SCRIPT_VALUE_H_
#define THIRD_PARTY_BLINK_RENDERER_BINDINGS_CORE_V8_SCRIPT_VALUE_H_
#include "base/memory/scoped_refptr.h"
#include "third_party/blink/renderer/bindings/core/v8/native_value_traits.h"
#include "third_party/blink/renderer/bindings/core/v8/world_safe_v8_reference.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/platform/bindings/script_state.h"
#include "third_party/blink/renderer/platform/bindings/trace_wrapper_v8_reference.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
#include "v8/include/v8.h"
namespace blink {
class CORE_EXPORT ScriptValue final {
DISALLOW_NEW();
public:
// Defined in ToV8.h due to circular dependency
template <typename T>
static ScriptValue From(ScriptState*, T&& value);
template <typename T, typename... Arguments>
static inline T To(v8::Isolate* isolate,
v8::Local<v8::Value> value,
ExceptionState& exception_state,
Arguments const&... arguments) {
return NativeValueTraits<T>::NativeValue(isolate, value, exception_state,
arguments...);
}
template <typename T, typename... Arguments>
static inline T To(v8::Isolate* isolate,
const ScriptValue& value,
ExceptionState& exception_state,
Arguments const&... arguments) {
return To<T>(isolate, value.V8Value(), exception_state, arguments...);
}
ScriptValue() = default;
ScriptValue(v8::Isolate* isolate, v8::Local<v8::Value> value)
: isolate_(isolate), value_(isolate, value) {
DCHECK(isolate_);
}
template <typename T>
ScriptValue(v8::Isolate* isolate, v8::MaybeLocal<T> value)
: isolate_(isolate),
value_(isolate,
value.IsEmpty() ? v8::Local<T>() : value.ToLocalChecked()) {
DCHECK(isolate_);
}
ScriptValue(const ScriptValue& value) = default;
// TODO(riakf): Use this GetIsolate() only when doing DCHECK inside
// ScriptValue.
v8::Isolate* GetIsolate() const {
DCHECK(isolate_);
return isolate_;
}
ScriptValue& operator=(const ScriptValue& value) = default;
bool operator==(const ScriptValue& value) const {
if (IsEmpty())
return value.IsEmpty();
if (value.IsEmpty())
return false;
return value_ == value.value_;
}
bool operator!=(const ScriptValue& value) const { return !operator==(value); }
// This creates a new local Handle; Don't use this in performance-sensitive
// places.
bool IsFunction() const {
DCHECK(!IsEmpty());
v8::Local<v8::Value> value = V8Value();
return !value.IsEmpty() && value->IsFunction();
}
// This creates a new local Handle; Don't use this in performance-sensitive
// places.
bool IsNull() const {
DCHECK(!IsEmpty());
v8::Local<v8::Value> value = V8Value();
return !value.IsEmpty() && value->IsNull();
}
// This creates a new local Handle; Don't use this in performance-sensitive
// places.
bool IsUndefined() const {
DCHECK(!IsEmpty());
v8::Local<v8::Value> value = V8Value();
return !value.IsEmpty() && value->IsUndefined();
}
// This creates a new local Handle; Don't use this in performance-sensitive
// places.
bool IsObject() const {
DCHECK(!IsEmpty());
v8::Local<v8::Value> value = V8Value();
return !value.IsEmpty() && value->IsObject();
}
bool IsEmpty() const { return value_.IsEmpty(); }
void Clear() {
isolate_ = nullptr;
value_.Reset();
}
v8::Local<v8::Value> V8Value() const;
// Returns v8Value() if a given ScriptState is the same as the
// ScriptState which is associated with this ScriptValue. Otherwise
// this "clones" the v8 value and returns it.
v8::Local<v8::Value> V8ValueFor(ScriptState*) const;
bool ToString(String&) const;
static ScriptValue CreateNull(v8::Isolate*);
void Trace(Visitor* visitor) const { visitor->Trace(value_); }
private:
v8::Isolate* isolate_ = nullptr;
WorldSafeV8Reference<v8::Value> value_;
};
template <>
struct NativeValueTraits<ScriptValue>
: public NativeValueTraitsBase<ScriptValue> {
static inline ScriptValue NativeValue(v8::Isolate* isolate,
v8::Local<v8::Value> value,
ExceptionState& exception_state) {
return ScriptValue(isolate, value);
}
};
} // namespace blink
namespace WTF {
template <>
struct VectorTraits<blink::ScriptValue> : VectorTraitsBase<blink::ScriptValue> {
STATIC_ONLY(VectorTraits);
static constexpr bool kCanClearUnusedSlotsWithMemset = true;
};
} // namespace WTF
#endif // THIRD_PARTY_BLINK_RENDERER_BINDINGS_CORE_V8_SCRIPT_VALUE_H_
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