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/******************************************************************************
* Top contributors (to current version):
* Andrew Reynolds, Yoni Zohar
*
* 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.
* ****************************************************************************
*
* Utilities for LFSC proofs.
*/
#include "proof/lfsc/lfsc_util.h"
#include "proof/proof_checker.h"
#include "util/rational.h"
using namespace cvc5::kind;
namespace cvc5 {
namespace proof {
const char* toString(LfscRule id)
{
switch (id)
{
case LfscRule::SCOPE: return "scope";
case LfscRule::NEG_SYMM: return "neg_symm";
case LfscRule::CONG: return "cong";
case LfscRule::AND_INTRO1: return "and_intro1";
case LfscRule::AND_INTRO2: return "and_intro2";
case LfscRule::NOT_AND_REV: return "not_and_rev";
case LfscRule::PROCESS_SCOPE: return "process_scope";
case LfscRule::ARITH_SUM_UB: return "arith_sum_ub";
case LfscRule::INSTANTIATE: return "instantiate";
case LfscRule::SKOLEMIZE: return "skolemize";
case LfscRule::LAMBDA: return "\\";
case LfscRule::PLET: return "plet";
default: return "?";
}
}
std::ostream& operator<<(std::ostream& out, LfscRule id)
{
out << toString(id);
return out;
}
bool getLfscRule(Node n, LfscRule& lr)
{
uint32_t id;
if (ProofRuleChecker::getUInt32(n, id))
{
lr = static_cast<LfscRule>(id);
return true;
}
return false;
}
LfscRule getLfscRule(Node n)
{
LfscRule lr = LfscRule::UNKNOWN;
getLfscRule(n, lr);
return lr;
}
Node mkLfscRuleNode(LfscRule r)
{
return NodeManager::currentNM()->mkConst(CONST_RATIONAL,
Rational(static_cast<uint32_t>(r)));
}
bool LfscProofLetifyTraverseCallback::shouldTraverse(const ProofNode* pn)
{
if (pn->getRule() == PfRule::SCOPE)
{
return false;
}
if (pn->getRule() != PfRule::LFSC_RULE)
{
return true;
}
// do not traverse under LFSC (lambda) scope
LfscRule lr = getLfscRule(pn->getArguments()[0]);
return lr != LfscRule::LAMBDA;
}
} // namespace proof
} // namespace cvc5
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