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/********************* */
/*! \file ite_removal.cpp
** \verbatim
** Top contributors (to current version):
** Andres Noetzli, Mathias Preiner
** This file is part of the CVC4 project.
** Copyright (c) 2009-2020 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 Remove ITEs from the assertions
**
** [[ Add lengthier description here ]]
** \todo document this file
**/
#include "preprocessing/passes/ite_removal.h"
#include "theory/rewriter.h"
namespace CVC4 {
namespace preprocessing {
namespace passes {
using namespace CVC4::theory;
IteRemoval::IteRemoval(PreprocessingPassContext* preprocContext)
: PreprocessingPass(preprocContext, "ite-removal")
{
}
PreprocessingPassResult IteRemoval::applyInternal(AssertionPipeline* assertions)
{
d_preprocContext->spendResource(ResourceManager::Resource::PreprocessStep);
IteSkolemMap& imap = assertions->getIteSkolemMap();
// Remove all of the ITE occurrences and normalize
for (unsigned i = 0, size = assertions->size(); i < size; ++i)
{
std::vector<theory::TrustNode> newAsserts;
std::vector<Node> newSkolems;
TrustNode trn = d_preprocContext->getIteRemover()->run(
(*assertions)[i], newAsserts, newSkolems, true);
// process
assertions->replace(i, trn.getNode());
Assert(newSkolems.size() == newAsserts.size());
for (unsigned j = 0, nnasserts = newAsserts.size(); j < nnasserts; j++)
{
imap[newSkolems[j]] = assertions->size();
assertions->ref().push_back(newAsserts[j].getNode());
}
}
for (unsigned i = 0, size = assertions->size(); i < size; ++i)
{
assertions->replace(i, Rewriter::rewrite((*assertions)[i]));
}
return PreprocessingPassResult::NO_CONFLICT;
}
} // namespace passes
} // namespace preprocessing
} // namespace CVC4
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