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/********************* */
/*! \file quant_util.h
** \verbatim
** Top contributors (to current version):
** Morgan Deters, Andrew Reynolds, Tim King
** This file is part of the CVC4 project.
** Copyright (c) 2009-2016 by the authors listed in the file AUTHORS
** in the top-level source directory) and their institutional affiliations.
** All rights reserved. See the file COPYING in the top-level source
** directory for licensing information.\endverbatim
**
** \brief quantifier util
**/
#include "cvc4_private.h"
#ifndef __CVC4__THEORY__QUANT_UTIL_H
#define __CVC4__THEORY__QUANT_UTIL_H
#include "theory/theory.h"
#include "theory/uf/equality_engine.h"
#include <ext/hash_set>
#include <iostream>
#include <map>
namespace CVC4 {
namespace theory {
class QuantifiersEngine;
class QuantArith
{
public:
static bool getMonomial( Node n, Node& c, Node& v );
static bool getMonomial( Node n, std::map< Node, Node >& msum );
static bool getMonomialSum( Node n, std::map< Node, Node >& msum );
static bool getMonomialSumLit( Node lit, std::map< Node, Node >& msum );
static Node mkNode( std::map< Node, Node >& msum );
//return 1 : solved on LHS, return -1 : solved on RHS, return 0: failed
static int isolate( Node v, std::map< Node, Node >& msum, Node & veq_c, Node & val, Kind k );
static int isolate( Node v, std::map< Node, Node >& msum, Node & veq, Kind k, bool doCoeff = false );
static Node solveEqualityFor( Node lit, Node v );
static Node negate( Node t );
static Node offset( Node t, int i );
static void debugPrintMonomialSum( std::map< Node, Node >& msum, const char * c );
};
class QuantRelevance
{
private:
/** for computing relevance */
bool d_computeRel;
/** map from quantifiers to symbols they contain */
std::map< Node, std::vector< Node > > d_syms;
/** map from symbols to quantifiers */
std::map< Node, std::vector< Node > > d_syms_quants;
/** relevance for quantifiers and symbols */
std::map< Node, int > d_relevance;
/** compute symbols */
void computeSymbols( Node n, std::vector< Node >& syms );
public:
QuantRelevance( bool cr ) : d_computeRel( cr ){}
~QuantRelevance(){}
/** register quantifier */
void registerQuantifier( Node f );
/** set relevance */
void setRelevance( Node s, int r );
/** get relevance */
int getRelevance( Node s ) { return d_relevance.find( s )==d_relevance.end() ? -1 : d_relevance[s]; }
/** get number of quantifiers for symbol s */
int getNumQuantifiersForSymbol( Node s ) { return (int)d_syms_quants[s].size(); }
};
class QuantPhaseReq
{
private:
/** helper functions compute phase requirements */
void computePhaseReqs( Node n, bool polarity, std::map< Node, int >& phaseReqs );
public:
QuantPhaseReq(){}
QuantPhaseReq( Node n, bool computeEq = false );
~QuantPhaseReq(){}
void initialize( Node n, bool computeEq );
/** is phase required */
bool isPhaseReq( Node lit ) { return d_phase_reqs.find( lit )!=d_phase_reqs.end(); }
/** get phase requirement */
bool getPhaseReq( Node lit ) { return d_phase_reqs.find( lit )==d_phase_reqs.end() ? false : d_phase_reqs[ lit ]; }
/** phase requirements for each quantifier for each instantiation literal */
std::map< Node, bool > d_phase_reqs;
std::map< Node, bool > d_phase_reqs_equality;
std::map< Node, Node > d_phase_reqs_equality_term;
static void getPolarity( Node n, int child, bool hasPol, bool pol, bool& newHasPol, bool& newPol );
static void getEntailPolarity( Node n, int child, bool hasPol, bool pol, bool& newHasPol, bool& newPol );
};
class EqualityQuery {
public:
EqualityQuery(){}
virtual ~EqualityQuery(){};
/** contains term */
virtual bool hasTerm( Node a ) = 0;
/** get the representative of the equivalence class of a */
virtual Node getRepresentative( Node a ) = 0;
/** returns true if a and b are equal in the current context */
virtual bool areEqual( Node a, Node b ) = 0;
/** returns true is a and b are disequal in the current context */
virtual bool areDisequal( Node a, Node b ) = 0;
/** get the equality engine associated with this query */
virtual eq::EqualityEngine* getEngine() = 0;
/** get the equivalence class of a */
virtual void getEquivalenceClass( Node a, std::vector< Node >& eqc ) = 0;
};/* class EqualityQuery */
}
}
#endif
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