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/********************* */
/*! \file substitutions.h
** \verbatim
** Original author: mdeters
** Major contributors: none
** 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 A substitution mapping for theory simplification
**
** A substitution mapping for theory simplification.
**/
#include "cvc4_private.h"
#ifndef __CVC4__THEORY__SUBSTITUTIONS_H
#define __CVC4__THEORY__SUBSTITUTIONS_H
#include <utility>
#include <vector>
#include <algorithm>
#include "expr/node.h"
namespace CVC4 {
namespace theory {
/**
* The type for the Substitutions mapping output by
* Theory::simplify(), TheoryEngine::simplify(), and
* Valuation::simplify(). This is in its own header to avoid circular
* dependences between those three.
*/
class SubstitutionMap {
public:
typedef std::hash_map<Node, Node, NodeHashFunction> NodeMap;
private:
/** The variables, in order of addition */
NodeMap d_substitutions;
/** Cache of the already performed substitutions */
NodeMap d_substitutionCache;
/** Has the cache been invalidated */
bool d_cacheInvalidated;
/** Internaal method that performs substitution */
Node internalSubstitute(TNode t, NodeMap& substitutionCache);
public:
SubstitutionMap(): d_cacheInvalidated(true) {}
/**
* Adds a substitution from x to t
*/
void addSubstitution(TNode x, TNode t, bool invalidateCache = true);
/**
* Apply the substitutions to the node.
*/
Node apply(TNode t);
/**
* Apply the substitutions to the node.
*/
Node apply(TNode t) const {
return const_cast<SubstitutionMap*>(this)->apply(t);
}
/**
* Clear out the accumulated substitutions, resetting this
* SubstitutionMap to the way it was when first constructed.
*/
void clear() {
d_substitutions.clear();
d_substitutionCache.clear();
d_cacheInvalidated = true;
}
/**
* Swap the contents of this SubstitutionMap with those of another.
*/
void swap(SubstitutionMap& map) {
d_substitutions.swap(map.d_substitutions);
d_substitutionCache.swap(map.d_substitutionCache);
std::swap(d_cacheInvalidated, map.d_cacheInvalidated);
}
/**
* Print to the output stream
*/
void print(std::ostream& out) const;
};
inline std::ostream& operator << (std::ostream& out, const SubstitutionMap& subst) {
subst.print(out);
return out;
}
}/* CVC4::theory namespace */
}/* CVC4 namespace */
#endif /* __CVC4__THEORY__SUBSTITUTIONS_H */
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