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/********************* */
/*! \file eqc_info.h
** \verbatim
** Top contributors (to current version):
** Andrew Reynolds
** This file is part of the CVC4 project.
** Copyright (c) 2009-2019 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 Equivalence class info for the theory of strings
**/
#include "cvc4_private.h"
#ifndef CVC4__THEORY__STRINGS__EQC_INFO_H
#define CVC4__THEORY__STRINGS__EQC_INFO_H
#include <map>
#include "context/cdo.h"
#include "context/context.h"
#include "expr/node.h"
namespace CVC4 {
namespace theory {
namespace strings {
/**
* SAT-context-dependent information about an equivalence class. This
* information is updated eagerly as assertions are processed by the theory of
* strings at standard effort.
*/
class EqcInfo
{
public:
EqcInfo(context::Context* c);
~EqcInfo() {}
/** add prefix constant
*
* This informs this equivalence class info that a term t in its
* equivalence class has a constant prefix (if isSuf=true) or suffix
* (if isSuf=false). The constant c (if non-null) is the value of that
* constant, if it has been computed already.
*
* If this method returns a non-null node ret, then ret is a conjunction
* corresponding to a conflict that holds in the current context.
*/
Node addEndpointConst(Node t, Node c, bool isSuf);
/**
* If non-null, this is a term x from this eq class such that str.len( x )
* occurs as a term in this SAT context.
*/
context::CDO<Node> d_lengthTerm;
/**
* If non-null, this is a term x from this eq class such that str.code( x )
* occurs as a term in this SAT context.
*/
context::CDO<Node> d_codeTerm;
context::CDO<unsigned> d_cardinalityLemK;
context::CDO<Node> d_normalizedLength;
/**
* A node that explains the longest constant prefix known of this
* equivalence class. This can either be:
* (1) A term from this equivalence class, including a constant "ABC" or
* concatenation term (str.++ "ABC" ...), or
* (2) A membership of the form (str.in.re x R) where x is in this
* equivalence class and R is a regular expression of the form
* (str.to.re "ABC") or (re.++ (str.to.re "ABC") ...).
*/
context::CDO<Node> d_prefixC;
/** same as above, for suffix. */
context::CDO<Node> d_suffixC;
};
} // namespace strings
} // namespace theory
} // namespace CVC4
#endif /* CVC4__THEORY__STRINGS__EQC_INFO_H */
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