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/********************* */
/*! \file dimacs.cpp
** \verbatim
** Top contributors (to current version):
** Alex Ozdemir
** 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 DIMACS SAT Problem Format
**
** Defines serialization for SAT problems as DIMACS
**/
#include "proof/dimacs.h"
#include "base/check.h"
#include <iostream>
namespace CVC4 {
namespace proof {
// Prints the literal as a (+) or (-) int
// Not operator<< b/c that represents negation as ~
std::ostream& textOut(std::ostream& o, const prop::SatLiteral& l)
{
if (l.isNegated())
{
o << "-";
}
return o << l.getSatVariable() + 1;
}
// Prints the clause as a space-separated list of ints
// Not operator<< b/c that represents negation as ~
std::ostream& textOut(std::ostream& o, const prop::SatClause& c)
{
for (const auto& l : c)
{
textOut(o, l) << " ";
}
return o << "0";
}
void printDimacs(std::ostream& o,
const std::unordered_map<ClauseId, prop::SatClause>& clauses,
const std::vector<ClauseId>& usedIndices)
{
size_t maxVar = 0;
for (const ClauseId i : usedIndices)
{
const prop::SatClause& c = clauses.at(i);
for (const auto& l : c)
{
if (l.getSatVariable() + 1 > maxVar)
{
maxVar = l.getSatVariable() + 1;
}
}
}
o << "p cnf " << maxVar << " " << usedIndices.size() << '\n';
for (const ClauseId i : usedIndices)
{
const prop::SatClause& c = clauses.at(i);
for (const auto& l : c)
{
if (l.isNegated())
{
o << '-';
}
o << l.getSatVariable() + 1 << " ";
}
o << "0\n";
}
}
std::vector<prop::SatClause> parseDimacs(std::istream& in)
{
std::string tag;
uint64_t nVars;
uint64_t nClauses;
in >> tag;
Assert(in.good());
Assert(tag == "p");
in >> tag;
Assert(in.good());
Assert(tag == "cnf");
in >> nVars;
Assert(nVars >= 0);
in >> nClauses;
Assert(nClauses >= 0);
std::vector<prop::SatClause> cnf;
for (uint64_t i = 0; i < nClauses; ++i)
{
cnf.emplace_back();
int64_t lit;
in >> lit;
Assert(in.good());
while (lit != 0)
{
cnf.back().emplace_back(std::abs(lit) - 1, lit < 0);
in >> lit;
Assert(static_cast<uint64_t>(std::abs(lit)) <= nVars);
Assert(in.good());
}
}
return cnf;
}
} // namespace proof
} // namespace CVC4
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