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/********************* */
/*! \file skolem_lemma.cpp
** \verbatim
** Top contributors (to current version):
** Andrew Reynolds
** This file is part of the CVC4 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.\endverbatim
**
** \brief The skolem lemma utility
**/
#include "theory/skolem_lemma.h"
#include "expr/skolem_manager.h"
namespace CVC4 {
namespace theory {
SkolemLemma::SkolemLemma(TrustNode lem, Node k) : d_lemma(lem), d_skolem(k)
{
Assert(lem.getKind() == TrustNodeKind::LEMMA);
}
SkolemLemma::SkolemLemma(Node k, ProofGenerator* pg) : d_lemma(), d_skolem(k)
{
Node lem = getSkolemLemmaFor(k);
d_lemma = TrustNode::mkTrustLemma(lem, pg);
}
Node SkolemLemma::getSkolemLemmaFor(Node k)
{
Node w = SkolemManager::getWitnessForm(k);
Assert(w.getKind() == kind::WITNESS);
TNode tx = w[0][0];
TNode tk = k;
return w[1].substitute(tx, tk);
}
} // namespace theory
} // namespace CVC4
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