/******************************************************************************

 * Top contributors (to current version):

 *   Andrew Reynolds, Haniel Barbosa, Gereon Kremer

 *

 * 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.

 * ****************************************************************************

 *

 * Conversion from ProofNode to s-expressions.

 */

#include "cvc5_private.h"

#ifndef CVC5__EXPR__PROOF_NODE_TO_SEXPR_H

#define CVC5__EXPR__PROOF_NODE_TO_SEXPR_H

#include <map>

#include "expr/node.h"

#include "expr/proof_rule.h"

namespace cvc5 {

class ProofNode;

/** A class to convert ProofNode objects to s-expressions */

class ProofNodeToSExpr

{

 public:

  ProofNodeToSExpr();

  /** Convert the given proof node to an s-expression

   *

   * This is useful for operations where it is useful to view a ProofNode as

   * a Node. Printing is one such example, where a ProofNode can be printed

   * as a dag after this conversion.

   *

   * The s-expression for a ProofNode has the form:

   *   (SEXPR (VAR "<d_rule>") S1 ... Sn (VAR ":args") (SEXPR <d_args>))

   * where S1, ..., Sn are the s-expressions for its <d_children>.

   */

  Node convertToSExpr(const ProofNode* pn);

 private:

  /** map proof rules to a variable */

  std::map<PfRule, Node> d_pfrMap;

  /** Dummy ":args" marker */

  Node d_argsMarker;

  /** Dummy ":conclusion" marker */

  Node d_conclusionMarker;

  /** map proof nodes to their s-expression */

  std::map<const ProofNode*, Node> d_pnMap;

  /**

   * map nodes to a bound variable, used for nodes that have special AST status

   * like builtin operators

   */

  std::map<Node, Node> d_nodeMap;

  /** get or make pf rule variable */

  Node getOrMkPfRuleVariable(PfRule r);

  /** get or make node variable */

  Node getOrMkNodeVariable(Node n);

};

}  // namespace cvc5

#endif /* CVC5__EXPR__PROOF_RULE_H */