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/********************* */
/*! \file regexp_operation.h
** \verbatim
** Original author: Tianyi Liang
** Major contributors: none
** Minor contributors (to current version): none
** This file is part of the CVC4 project.
** Copyright (c) 2009-2013 New York University and The University of Iowa
** See the file COPYING in the top-level source directory for licensing
** information.\endverbatim
**
** \brief Regular Expresion Operations
**
** Regular Expresion Operations
**/
#include "cvc4_private.h"
#ifndef __CVC4__THEORY__STRINGS__REGEXP__OPERATION_H
#define __CVC4__THEORY__STRINGS__REGEXP__OPERATION_H
#include <vector>
#include "util/hash.h"
#include "theory/theory.h"
#include "theory/rewriter.h"
namespace CVC4 {
namespace theory {
namespace strings {
class RegExpOpr {
typedef std::pair< Node, CVC4::String > PairDvStr;
private:
Node d_emptyString;
char d_char_start;
char d_char_end;
Node d_sigma;
Node d_sigma_star;
std::map< Node, Node > d_compl_cache;
std::map< Node, int > d_delta_cache;
std::map< PairDvStr, Node > d_dv_cache;
std::map< Node, bool > d_cstre_cache;
//bool checkStarPlus( Node t );
//void simplifyRegExp( Node s, Node r, std::vector< Node > &ret, std::vector< Node > &nn );
//Node simplify( Node t, std::vector< Node > &new_nodes );
std::string niceChar( Node r );
int gcd ( int a, int b );
public:
RegExpOpr();
bool checkConstRegExp( Node r );
//void simplify(std::vector< Node > &vec_node);
Node mkAllExceptOne( char c );
Node complement( Node r );
int delta( Node r );
Node derivativeSingle( Node r, CVC4::String c );
bool guessLength( Node r, int &co );
void firstChar( Node r );
bool follow( Node r, CVC4::String c, std::vector< char > &vec_chars );
std::string mkString( Node r );
};
}/* CVC4::theory::strings namespace */
}/* CVC4::theory namespace */
}/* CVC4 namespace */
#endif /* __CVC4__THEORY__STRINGS__REGEXP__OPERATION_H */
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