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/********************* */
/*! \file quantifiers_rewriter.h
** \verbatim
** Original author: ajreynol
** Major contributors: mdeters
** Minor contributors (to current version): none
** This file is part of the CVC4 prototype.
** Copyright (c) 2009, 2010, 2011 The Analysis of Computer Systems Group (ACSys)
** Courant Institute of Mathematical Sciences
** New York University
** See the file COPYING in the top-level source directory for licensing
** information.\endverbatim
**
** \brief Rewriter for the theory of inductive quantifiers
**
** Rewriter for the theory of inductive quantifiers.
**/
#include "cvc4_private.h"
#ifndef __CVC4__THEORY__QUANTIFIERS__QUANTIFIERS_REWRITER_H
#define __CVC4__THEORY__QUANTIFIERS__QUANTIFIERS_REWRITER_H
#include "theory/rewriter.h"
#include "theory/quantifiers_engine.h"
namespace CVC4 {
namespace theory {
namespace quantifiers {
// attribute for "contains instantiation constants from"
struct NestedQuantAttributeId {};
typedef expr::Attribute<NestedQuantAttributeId, Node> NestedQuantAttribute;
class QuantifiersRewriter {
public:
static bool isClause( Node n );
static bool isLiteral( Node n );
static bool isCube( Node n );
private:
static void addNodeToOrBuilder( Node n, NodeBuilder<>& t );
static Node mkForAll( std::vector< Node >& args, Node body, Node ipl );
static void computeArgs( std::vector< Node >& args, std::vector< Node >& activeArgs, Node n );
static bool hasArg( std::vector< Node >& args, Node n );
static void setNestedQuantifiers( Node n, Node q );
static void computeArgs( std::map< Node, bool >& active, Node n );
static Node computeClause( Node n );
private:
static Node computeMiniscoping( std::vector< Node >& args, Node body, Node ipl, bool isNested = false );
static Node computeNNF( Node body );
static Node computeVarElimination( Node body, std::vector< Node >& args, Node& ipl );
static Node computeCNF( Node body, std::vector< Node >& args, NodeBuilder<>& defs, bool forcePred );
static Node computePrenex( Node body, std::vector< Node >& args, bool pol, bool polReq );
private:
enum{
COMPUTE_NNF = 0,
COMPUTE_PRE_SKOLEM,
COMPUTE_PRENEX,
COMPUTE_VAR_ELIMINATION,
//COMPUTE_FLATTEN_ARGS_UF,
COMPUTE_CNF,
COMPUTE_LAST
};
static Node computeOperation( Node f, int computeOption );
public:
static RewriteResponse preRewrite(TNode in);
static RewriteResponse postRewrite(TNode in);
static inline void init() {}
static inline void shutdown() {}
private:
/** options */
static bool doMiniscopingNoFreeVar();
static bool doMiniscopingAnd();
static bool doOperation( Node f, bool isNested, int computeOption, bool duringRewrite = true );
public:
static Node rewriteQuants( Node n, bool isNested = false, bool duringRewrite = true );
static Node rewriteQuant( Node n, bool isNested = false, bool duringRewrite = true );
};/* class QuantifiersRewriter */
}/* CVC4::theory::quantifiers namespace */
}/* CVC4::theory namespace */
}/* CVC4 namespace */
#endif /* __CVC4__THEORY__QUANTIFIERS__QUANTIFIERS_REWRITER_H */
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