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/********************* */
/*! \file foreign_theory_rewrite.h
** \verbatim
** Top contributors (to current version):
** Yoni Zohar, Gereon Kremer
** This file is part of the CVC4 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.\endverbatim
**
** \brief The foreign_theory_rewrite preprocessing pass
**
** Simplifies nodes of one theory using rewrites from another.
**/
#include "cvc4_private.h"
#ifndef CVC4__PREPROCESSING__PASSES__FOREIGN_THEORY_REWRITE_H
#define CVC4__PREPROCESSING__PASSES__FOREIGN_THEORY_REWRITE_H
#include "context/cdhashmap.h"
#include "expr/node.h"
#include "preprocessing/preprocessing_pass.h"
namespace cvc5 {
namespace preprocessing {
namespace passes {
using CDNodeMap = context::CDHashMap<Node, Node, NodeHashFunction>;
class ForeignTheoryRewrite : public PreprocessingPass
{
public:
ForeignTheoryRewrite(PreprocessingPassContext* preprocContext);
protected:
PreprocessingPassResult applyInternal(
AssertionPipeline* assertionsToPreprocess) override;
/** the main function that simplifies n.
* does a traversal on n and call rewriting fucntions.
*/
Node simplify(Node n);
/** A specific simplification function specific for GEQ
* constraints in strings.
*/
static Node rewriteStringsGeq(Node n);
/** invoke rewrite functions for n.
* based on the structure of n (typically its kind)
* we invoke rewrites from other theories.
* For example: when encountering a `>=` node,
* we invoke rewrites from the theory of strings.
*/
static Node foreignRewrite(Node n);
/** construct a node with the same operator as originalNode whose children are
* processedChildren
*/
static Node reconstructNode(Node originalNode, std::vector<Node> newChildren);
/** A cache to store the simplified nodes */
CDNodeMap d_cache;
};
} // namespace passes
} // namespace preprocessing
} // namespace cvc5
#endif /* CVC4__PREPROCESSING__PASSES__FOREIGN_THEORY_REWRITE_H */
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