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/*
* Copyright (C) 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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_V8_STRING_RESOURCE_H_
#define THIRD_PARTY_BLINK_RENDERER_BINDINGS_CORE_V8_V8_STRING_RESOURCE_H_
#include "third_party/blink/renderer/platform/bindings/exception_state.h"
#include "third_party/blink/renderer/platform/bindings/string_resource.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/text/atomic_string.h"
#include "third_party/blink/renderer/platform/wtf/threading.h"
#include "v8/include/v8.h"
namespace blink {
// V8StringResource is an adapter class that converts V8 values to Strings
// or AtomicStrings as appropriate, using multiple typecast operators.
enum V8StringResourceMode {
kDefaultMode,
kTreatNullAsEmptyString,
kTreatNullAsNullString,
kTreatNullAndUndefinedAsNullString
};
template <V8StringResourceMode Mode = kDefaultMode>
class V8StringResource {
STACK_ALLOCATED();
public:
V8StringResource() : mode_(kExternalize) {}
V8StringResource(v8::Local<v8::Value> object)
: v8_object_(object), mode_(kExternalize) {}
V8StringResource(const String& string)
: mode_(kExternalize), string_(string) {}
void operator=(v8::Local<v8::Value> object) { v8_object_ = object; }
void operator=(const String& string) { SetString(string); }
void operator=(std::nullptr_t) { SetString(String()); }
bool Prepare() { // DEPRECATED
if (PrepareFast())
return true;
return v8_object_->ToString(v8::Isolate::GetCurrent()->GetCurrentContext())
.ToLocal(&v8_object_);
}
bool Prepare(v8::Isolate* isolate, ExceptionState& exception_state) {
return PrepareFast() || PrepareSlow(isolate, exception_state);
}
bool Prepare(ExceptionState& exception_state) { // DEPRECATED
return PrepareFast() ||
PrepareSlow(v8::Isolate::GetCurrent(), exception_state);
}
operator String() const { return ToString<String>(); }
operator AtomicString() const { return ToString<AtomicString>(); }
private:
bool PrepareFast() {
if (v8_object_.IsEmpty())
return true;
if (!IsValid()) {
SetString(FallbackString());
return true;
}
if (LIKELY(v8_object_->IsString()))
return true;
if (LIKELY(v8_object_->IsInt32())) {
SetString(ToBlinkString(v8_object_.As<v8::Int32>()->Value()));
return true;
}
mode_ = kDoNotExternalize;
return false;
}
bool PrepareSlow(v8::Isolate* isolate, ExceptionState& exception_state) {
v8::TryCatch try_catch(isolate);
if (!v8_object_->ToString(isolate->GetCurrentContext())
.ToLocal(&v8_object_)) {
exception_state.RethrowV8Exception(try_catch.Exception());
return false;
}
return true;
}
bool IsValid() const;
String FallbackString() const;
void SetString(const String& string) {
string_ = string;
v8_object_.Clear(); // To signal that String is ready.
}
template <class StringType>
StringType ToString() const {
if (LIKELY(!v8_object_.IsEmpty()))
return ToBlinkString<StringType>(
const_cast<v8::Local<v8::Value>*>(&v8_object_)->As<v8::String>(),
mode_);
return StringType(string_);
}
v8::Local<v8::Value> v8_object_;
ExternalMode mode_;
String string_;
};
template <>
inline bool V8StringResource<kDefaultMode>::IsValid() const {
return true;
}
template <>
inline String V8StringResource<kDefaultMode>::FallbackString() const {
NOTREACHED();
return String();
}
template <>
inline bool V8StringResource<kTreatNullAsEmptyString>::IsValid() const {
return !v8_object_->IsNull();
}
template <>
inline String V8StringResource<kTreatNullAsEmptyString>::FallbackString()
const {
return g_empty_string;
}
template <>
inline bool V8StringResource<kTreatNullAsNullString>::IsValid() const {
return !v8_object_->IsNull();
}
template <>
inline String V8StringResource<kTreatNullAsNullString>::FallbackString() const {
return String();
}
template <>
inline bool V8StringResource<kTreatNullAndUndefinedAsNullString>::IsValid()
const {
return !v8_object_->IsNull() && !v8_object_->IsUndefined();
}
template <>
inline String
V8StringResource<kTreatNullAndUndefinedAsNullString>::FallbackString() const {
return String();
}
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_BINDINGS_CORE_V8_V8_STRING_RESOURCE_H_
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