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nameexpression.h
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nameexpression.h
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/*
* The Doomsday Engine Project -- libcore
*
* Copyright © 2004-2017 Jaakko Keränen <jaakko.keranen@iki.fi>
*
* @par License
* LGPL: http://www.gnu.org/licenses/lgpl.html
*
* <small>This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 3 of the License, or (at your
* option) any later version. This program is distributed in the hope that it
* will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
* General Public License for more details. You should have received a copy of
* the GNU Lesser General Public License along with this program; if not, see:
* http://www.gnu.org/licenses</small>
*/
#ifndef LIBDENG2_NAMEEXPRESSION_H
#define LIBDENG2_NAMEEXPRESSION_H
#include "../Expression"
#include "../String"
#include <QFlags>
namespace de {
/**
* Responsible for referencing, creating, and deleting variables and record
* references based an textual identifier.
*
* @ingroup script
*/
class NameExpression : public Expression
{
public:
/// Identifier is not text. @ingroup errors
DENG2_ERROR(IdentifierError);
/// Variable already exists when it was required not to. @ingroup errors
DENG2_ERROR(AlreadyExistsError);
/// The identifier does not specify an existing variable. @ingroup errors
DENG2_ERROR(NotFoundError);
/// Special scope that can be specified in the constructor to tell the
/// expression to start looking in the context's local namespace.
static const String LOCAL_SCOPE;
public:
NameExpression();
NameExpression(const String &identifier, Flags flags = ByValue);
NameExpression(const StringList &identifierSeqeunce, Flags flags = ByValue);
/// Returns the identifier in the name expression.
String const &identifier() const;
Value *evaluate(Evaluator &evaluator) const;
// Implements ISerializable.
void operator >> (Writer &to) const;
void operator << (Reader &from);
private:
DENG2_PRIVATE(d)
};
} // namespace de
#endif /* LIBDENG2_NAMEEXPRESSION_H */