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/********************* */
/*! \file drat_proof.h
** \verbatim
** Top contributors (to current version):
** Alex Ozdemir
** This file is part of the CVC4 project.
** Copyright (c) 2009-2018 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 DRAT Proof Format
**
** Declares C++ types that represent a DRAT proof.
** Defines serialization for these types.
**
** You can find an introduction to DRAT in the drat-trim paper:
** http://www.cs.utexas.edu/~marijn/publications/drat-trim.pdf
**
**/
#ifndef __CVC4__PROOF__DRAT__DRAT_PROOF_H
#define __CVC4__PROOF__DRAT__DRAT_PROOF_H
#include "cvc4_private.h"
#include "prop/sat_solver.h"
#include "prop/sat_solver_types.h"
namespace CVC4 {
namespace proof {
namespace drat {
using CVC4::prop::SatClause;
using CVC4::prop::SatLiteral;
using CVC4::prop::SatVariable;
class CVC4_PUBLIC InvalidDratProofException : public CVC4::Exception
{
public:
InvalidDratProofException() : Exception("Invalid DRAT Proof") {}
InvalidDratProofException(const std::string& msg) : Exception(msg) {}
InvalidDratProofException(const char* msg) : Exception(msg) {}
}; /* class InvalidDratProofException */
enum DratInstructionKind
{
ADDITION,
DELETION
};
struct DratInstruction
{
DratInstruction(DratInstructionKind kind, SatClause clause);
/**
* Write the DRAT instruction in textual format.
* The format is described in:
* http://www.cs.utexas.edu/~marijn/publications/drat-trim.pdf
*
* @param os the stream to write to
*/
void outputAsText(std::ostream& os) const;
DratInstructionKind d_kind;
SatClause d_clause;
};
class DratProof
{
public:
DratProof(const DratProof&) = default;
DratProof(DratProof&&) = default;
~DratProof() = default;
/**
* Parses a DRAT proof from the **binary format**.
* The format is described at:
* https://www.cs.utexas.edu/~marijn/drat-trim/#contact
*
* What do the standard authors mean by the format being "binary"?
* They just mean that proofs in this format should be understood as
* sequences of bytes, not sequences of ASCII/Unicode/your favorite character
* set characters.
*
* @param binaryProof a string containing the bytes of the binary proof.
* Even though the proof isn't text, it's safe to store it in a string
* because C++ strings don't make any gaurantees about the encoding of
* their contents. This makes them (effectively) just byte sequences.
*
* @return the parsed proof
*/
static DratProof fromBinary(const std::string& binaryProof);
/**
* @return The instructions in this proof
*/
const std::vector<DratInstruction>& getInstructions() const;
/**
* Write the DRAT proof in textual format.
* The format is described in:
* http://www.cs.utexas.edu/~marijn/publications/drat-trim.pdf
*
* @param os the stream to write to
*/
void outputAsText(std::ostream& os) const;
private:
/**
* Create an DRAT proof with no instructions.
*/
DratProof();
/**
* The instructions of the DRAT proof.
*/
std::vector<DratInstruction> d_instructions;
};
} // namespace drat
} // namespace proof
} // namespace CVC4
#endif // __CVC4__PROOF__DRAT__DRAT_PROOF_H
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