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/********************* */
/*! \file proof_step_buffer.h
** \verbatim
** Top contributors (to current version):
** Andrew Reynolds
** 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 Proof step and proof step buffer utilities.
**/
#include "cvc4_private.h"
#ifndef CVC4__EXPR__PROOF_STEP_BUFFER_H
#define CVC4__EXPR__PROOF_STEP_BUFFER_H
#include <vector>
#include "expr/node.h"
#include "expr/proof_rule.h"
namespace CVC4 {
class ProofChecker;
/**
* Information for constructing a step in a CDProof. Notice that the conclusion
* of the proof step is intentionally not included in this data structure.
* Instead, it is intended that conclusions may be associated with proof steps
* based on e.g. the result of proof checking.
*/
class ProofStep
{
public:
ProofStep();
ProofStep(PfRule r,
const std::vector<Node>& children,
const std::vector<Node>& args);
/** The proof rule */
PfRule d_rule;
/** The proof children */
std::vector<Node> d_children;
/** The proof arguments */
std::vector<Node> d_args;
};
std::ostream& operator<<(std::ostream& out, ProofStep step);
/**
* Class used to speculatively try and buffer a set of proof steps before
* sending them to a proof object.
*/
class ProofStepBuffer
{
public:
ProofStepBuffer(ProofChecker* pc = nullptr);
~ProofStepBuffer() {}
/**
* Returns the conclusion of the proof step, as determined by the proof
* checker of the given proof. If this is non-null, then the given step
* is added to the buffer maintained by this class.
*
* If expected is non-null, then this method returns null if the result of
* checking is not equal to expected.
*/
Node tryStep(PfRule id,
const std::vector<Node>& children,
const std::vector<Node>& args,
Node expected = Node::null());
/** Same as above, without checking */
void addStep(PfRule id,
const std::vector<Node>& children,
const std::vector<Node>& args,
Node expected);
/** Multi-step version */
void addSteps(ProofStepBuffer& psb);
/** pop step */
void popStep();
/** Get num steps */
size_t getNumSteps() const;
/** Get steps */
const std::vector<std::pair<Node, ProofStep>>& getSteps() const;
/** Clear */
void clear();
private:
/** The proof checker*/
ProofChecker* d_checker;
/** the queued proof steps */
std::vector<std::pair<Node, ProofStep>> d_steps;
};
} // namespace CVC4
#endif /* CVC4__EXPR__PROOF_STEP_BUFFER_H */
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