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/******************************************************************************
* Top contributors (to current version):
* Andrew Reynolds, Andres Noetzli
*
* This file is part of the cvc5 project.
*
* Copyright (c) 2009-2021 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.
* ****************************************************************************
*
* Sequences solver for seq.nth/seq.update.
*/
#include "cvc5_private.h"
#ifndef CVC5__THEORY__STRINGS__ARRAY_SOLVER_H
#define CVC5__THEORY__STRINGS__ARRAY_SOLVER_H
#include "context/cdhashset.h"
#include "theory/strings/core_solver.h"
#include "theory/strings/extf_solver.h"
#include "theory/strings/inference_manager.h"
#include "theory/strings/solver_state.h"
#include "theory/strings/term_registry.h"
namespace cvc5 {
namespace theory {
namespace strings {
/**
* This is a solver for reasoning about seq.update and seq.nth
* natively. This class specifically addresses the combination of this
* operators with concatenation. It relies on a subsolver for doing array
* like reasoning (sequences_array_solver.h).
*/
class ArraySolver : protected EnvObj
{
typedef context::CDHashSet<Node> NodeSet;
public:
ArraySolver(Env& env,
SolverState& s,
InferenceManager& im,
TermRegistry& tr,
CoreSolver& cs,
ExtfSolver& es,
ExtTheory& extt);
~ArraySolver();
/**
* Perform reasoning about seq.nth and seq.update operations, in particular,
* their application to concatenation terms.
*/
void checkArrayConcat();
private:
/** check terms of given kind */
void checkTerms(Kind k);
/** The solver state object */
SolverState& d_state;
/** The (custom) output channel of the theory of strings */
InferenceManager& d_im;
/** Reference to the term registry of theory of strings */
TermRegistry& d_termReg;
/** reference to the core solver, used for certain queries */
CoreSolver& d_csolver;
/** reference to the extended solver, used for certain queries */
ExtfSolver& d_esolver;
/** Current terms */
std::map<Kind, std::vector<Node> > d_currTerms;
/** Common constants */
Node d_zero;
/** Equalities we have processed in the current context */
NodeSet d_eqProc;
};
} // namespace strings
} // namespace theory
} // namespace cvc5
#endif
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