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// Copyright 2017 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#ifndef FXJS_CJS_RETURN_H_
#define FXJS_CJS_RETURN_H_
#include "fxjs/cfxjs_engine.h"
#include "fxjs/js_resources.h"
#include "third_party/base/optional.h"
class CJS_Return {
public:
// Wrap constructors with static methods so we can apply WARN_UNUSED_RESULT,
// otherwise we can't catch places where someone mistakenly writes:
//
// if (error)
// CJS_Return(JS_ERROR_CODE);
//
// instead of
//
// if (error)
// return CJS_Return(JS_ERROR_CODE);
//
static CJS_Return Success() WARN_UNUSED_RESULT { return CJS_Return(); }
static CJS_Return Success(v8::Local<v8::Value> value) WARN_UNUSED_RESULT {
return CJS_Return(value);
}
static CJS_Return Failure(const WideString& str) WARN_UNUSED_RESULT {
return CJS_Return(str);
}
static CJS_Return Failure(JSMessage id) WARN_UNUSED_RESULT {
return CJS_Return(id);
}
CJS_Return(const CJS_Return&);
~CJS_Return();
bool HasError() const { return error_.has_value(); }
WideString Error() const { return error_.value(); }
bool HasReturn() const { return !return_.IsEmpty(); }
v8::Local<v8::Value> Return() const { return return_; }
private:
CJS_Return(); // Successful but empty return.
explicit CJS_Return(v8::Local<v8::Value>); // Successful return with value.
explicit CJS_Return(const WideString&); // Error with custom message.
explicit CJS_Return(JSMessage id); // Error with stock message.
Optional<WideString> error_;
v8::Local<v8::Value> return_;
};
#endif // FXJS_CJS_RETURN_H_
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