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/********************* */
/*! \file regexp_operation.h
** \verbatim
** Original author: Tianyi Liang
** Major contributors: Morgan Deters
** Minor contributors (to current version): none
** This file is part of the CVC4 project.
** Copyright (c) 2009-2014 New York University and The University of Iowa
** See the file COPYING in the top-level source directory for licensing
** information.\endverbatim
**
** \brief Symbolic Regular Expresion Operations
**
** Symbolic Regular Expression Operations
**/
#include "cvc4_private.h"
#ifndef __CVC4__THEORY__STRINGS__REGEXP__OPERATION_H
#define __CVC4__THEORY__STRINGS__REGEXP__OPERATION_H
#include <vector>
#include <set>
#include <algorithm>
#include <climits>
#include "util/hash.h"
#include "util/regexp.h"
#include "theory/theory.h"
#include "theory/rewriter.h"
//#include "context/cdhashmap.h"
namespace CVC4 {
namespace theory {
namespace strings {
class RegExpOpr {
typedef std::pair< Node, CVC4::String > PairNodeStr;
typedef std::set< Node > SetNodes;
typedef std::pair< Node, Node > PairNodes;
private:
unsigned char d_lastchar;
Node d_emptyString;
Node d_true;
Node d_false;
Node d_emptySingleton;
Node d_emptyRegexp;
Node d_zero;
Node d_one;
CVC4::Rational RMAXINT;
unsigned char d_char_start;
unsigned char d_char_end;
Node d_sigma;
Node d_sigma_star;
std::map< PairNodes, Node > d_simpl_cache;
std::map< PairNodes, Node > d_simpl_neg_cache;
std::map< Node, std::pair< int, Node > > d_delta_cache;
std::map< PairNodeStr, Node > d_dv_cache;
std::map< PairNodeStr, std::pair< Node, int > > d_deriv_cache;
std::map< Node, std::pair< Node, int > > d_compl_cache;
std::map< Node, bool > d_cstre_cache;
std::map< Node, std::pair< std::set<unsigned char>, std::set<Node> > > d_cset_cache;
std::map< Node, std::pair< std::set<unsigned char>, std::set<Node> > > d_fset_cache;
std::map< PairNodes, Node > d_inter_cache;
std::map< Node, Node > d_rm_inter_cache;
std::map< Node, bool > d_norv_cache;
std::map< Node, std::vector< PairNodes > > d_split_cache;
//bool checkStarPlus( Node t );
void simplifyPRegExp( Node s, Node r, std::vector< Node > &new_nodes );
void simplifyNRegExp( Node s, Node r, std::vector< Node > &new_nodes );
std::string niceChar( Node r );
int gcd ( int a, int b );
Node mkAllExceptOne( unsigned char c );
bool isPairNodesInSet(std::set< PairNodes > &s, Node n1, Node n2);
void getCharSet( Node r, std::set<unsigned char> &pcset, SetNodes &pvset );
bool containC2(unsigned cnt, Node n);
Node convert1(unsigned cnt, Node n);
void convert2(unsigned cnt, Node n, Node &r1, Node &r2);
bool testNoRV(Node r);
Node intersectInternal( Node r1, Node r2, std::map< PairNodes, Node > cache, unsigned cnt );
Node removeIntersection(Node r);
void firstChars( Node r, std::set<unsigned char> &pcset, SetNodes &pvset );
//TODO: for intersection
bool follow( Node r, CVC4::String c, std::vector< unsigned char > &vec_chars );
/*class CState {
public:
Node r1;
Node r2;
unsigned cnt;
Node head;
CState(Node rr1, Node rr2, Node rcnt, Node rhead)
: r1(rr1), r2(rr2), cnt(rcnt), head(rhead) {}
};*/
public:
RegExpOpr();
bool checkConstRegExp( Node r );
void simplify(Node t, std::vector< Node > &new_nodes, bool polarity);
int delta( Node r, Node &exp );
int derivativeS( Node r, CVC4::String c, Node &retNode );
Node derivativeSingle( Node r, CVC4::String c );
bool guessLength( Node r, int &co );
Node intersect(Node r1, Node r2, bool &spflag);
Node complement(Node r, int &ret);
void splitRegExp(Node r, std::vector< PairNodes > &pset);
void flattenRegExp(Node r, std::vector< std::pair< CVC4::String, unsigned > > &fvec);
void disjunctRegExp(Node r, std::vector<Node> &vec_or);
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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