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/******************************************************************************
* Top contributors (to current version):
* Andrew Reynolds, Mudathir Mohamed, 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.
* ****************************************************************************
*
* Implementation of sets term registry object.
*/
#include "theory/sets/term_registry.h"
#include "expr/emptyset.h"
#include "expr/skolem_manager.h"
using namespace std;
using namespace cvc5::kind;
namespace cvc5 {
namespace theory {
namespace sets {
TermRegistry::TermRegistry(SolverState& state,
InferenceManager& im,
SkolemCache& skc,
ProofNodeManager* pnm)
: d_im(im),
d_skCache(skc),
d_proxy(state.getUserContext()),
d_proxy_to_term(state.getUserContext()),
d_epg(
pnm ? new EagerProofGenerator(pnm, nullptr, "sets::TermRegistry::epg")
: nullptr)
{
}
Node TermRegistry::getProxy(Node n)
{
Kind nk = n.getKind();
if (nk != EMPTYSET && nk != SINGLETON && nk != INTERSECTION && nk != SETMINUS
&& nk != UNION && nk != UNIVERSE_SET)
{
return n;
}
NodeMap::const_iterator it = d_proxy.find(n);
if (it != d_proxy.end())
{
return (*it).second;
}
NodeManager* nm = NodeManager::currentNM();
Node k = d_skCache.mkTypedSkolemCached(
n.getType(), n, SkolemCache::SK_PURIFY, "sp");
d_proxy[n] = k;
d_proxy_to_term[k] = n;
Node eq = k.eqNode(n);
sendSimpleLemmaInternal(eq, InferenceId::SETS_PROXY);
if (nk == SINGLETON)
{
Node slem = nm->mkNode(MEMBER, n[0], k);
sendSimpleLemmaInternal(slem, InferenceId::SETS_PROXY_SINGLETON);
}
return k;
}
Node TermRegistry::getEmptySet(TypeNode tn)
{
std::map<TypeNode, Node>::iterator it = d_emptyset.find(tn);
if (it != d_emptyset.end())
{
return it->second;
}
Node n = NodeManager::currentNM()->mkConst(EmptySet(tn));
d_emptyset[tn] = n;
return n;
}
Node TermRegistry::getUnivSet(TypeNode tn)
{
std::map<TypeNode, Node>::iterator it = d_univset.find(tn);
if (it != d_univset.end())
{
return it->second;
}
NodeManager* nm = NodeManager::currentNM();
Node n = nm->mkNullaryOperator(tn, UNIVERSE_SET);
for (it = d_univset.begin(); it != d_univset.end(); ++it)
{
Node n1;
Node n2;
if (tn.isSubtypeOf(it->first))
{
n1 = n;
n2 = it->second;
}
else if (it->first.isSubtypeOf(tn))
{
n1 = it->second;
n2 = n;
}
if (!n1.isNull())
{
Node ulem = nm->mkNode(SUBSET, n1, n2);
Trace("sets-lemma") << "Sets::Lemma : " << ulem << " by univ-type"
<< std::endl;
d_im.lemma(ulem, InferenceId::SETS_UNIV_TYPE);
}
}
d_univset[tn] = n;
return n;
}
Node TermRegistry::getTypeConstraintSkolem(Node n, TypeNode tn)
{
std::map<TypeNode, Node>::iterator it = d_tc_skolem[n].find(tn);
if (it == d_tc_skolem[n].end())
{
SkolemManager* sm = NodeManager::currentNM()->getSkolemManager();
Node k = sm->mkDummySkolem("tc_k", tn);
d_tc_skolem[n][tn] = k;
return k;
}
return it->second;
}
void TermRegistry::debugPrintSet(Node s, const char* c) const
{
if (s.getNumChildren() == 0)
{
NodeMap::const_iterator it = d_proxy_to_term.find(s);
if (it != d_proxy_to_term.end())
{
debugPrintSet((*it).second, c);
}
else
{
Trace(c) << s;
}
}
else
{
Trace(c) << "(" << s.getOperator();
for (const Node& sc : s)
{
Trace(c) << " ";
debugPrintSet(sc, c);
}
Trace(c) << ")";
}
}
void TermRegistry::sendSimpleLemmaInternal(Node n, InferenceId id)
{
Trace("sets-lemma") << "Sets::Lemma : " << n << " by " << id << std::endl;
if (d_epg.get() != nullptr)
{
TrustNode teq =
d_epg->mkTrustNode(n, PfRule::MACRO_SR_PRED_INTRO, {}, {n});
d_im.trustedLemma(teq, id);
}
else
{
d_im.lemma(n, id);
}
}
} // namespace sets
} // namespace theory
} // namespace cvc5
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