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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 "cvc5_private.h"
#ifndef CVC5__PROOF__LFSC__LFSC_UTIL_H
#define CVC5__PROOF__LFSC__LFSC_UTIL_H
#include <iostream>
#include <map>
#include "expr/node.h"
#include "proof/proof_letify.h"
namespace cvc5 {
namespace proof {
/**
* LFSC rules. The enum below contains all rules that don't correspond to a
* PfRule, e.g. congruence in LFSC does not have the same form as congruence
* in the internal calculus.
*/
enum class LfscRule : uint32_t
{
//----------- translated rules
// We defined LFSC versions for rules that either don't exist in the internal
// calculus, or have a different set of arugments/children.
// scope has a different structure, e.g. uses lambdas
SCOPE,
// must distinguish equalities and disequalities
NEG_SYMM,
// congruence is done via a higher-order variant of congruence
CONG,
// we use unrolled binary versions of and intro
AND_INTRO1,
AND_INTRO2,
// needed as a helper for SCOPE
NOT_AND_REV,
PROCESS_SCOPE,
// arithmetic
ARITH_SUM_UB,
// form of quantifier rules varies from internal calculus
INSTANTIATE,
SKOLEMIZE,
// a lambda with argument
LAMBDA,
// a proof-let "plet"
PLET,
//----------- unknown
UNKNOWN,
};
/**
* Converts a lfsc rule to a string. Note: This function is also used in
* `safe_print()`. Changing this function name or signature will result in
* `safe_print()` printing "<unsupported>" instead of the proper strings for
* the enum values.
*
* @param id The lfsc rule
* @return The name of the lfsc rule
*/
const char* toString(LfscRule id);
/**
* Writes a lfsc rule name to a stream.
*
* @param out The stream to write to
* @param id The lfsc rule to write to the stream
* @return The stream
*/
std::ostream& operator<<(std::ostream& out, LfscRule id);
/** Get LFSC rule from a node */
LfscRule getLfscRule(Node n);
/** Get LFSC rule from a node, return true if success and store in lr */
bool getLfscRule(Node n, LfscRule& lr);
/** Make node for LFSC rule */
Node mkLfscRuleNode(LfscRule r);
/** Helper class used for letifying LFSC proofs. */
class LfscProofLetifyTraverseCallback : public ProofLetifyTraverseCallback
{
public:
bool shouldTraverse(const ProofNode* pn) override;
};
} // namespace proof
} // namespace cvc5
#endif
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