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/******************************************************************************
* Top contributors (to current version):
* Andrew Reynolds
*
* 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.
* ****************************************************************************
*
* Enumerators for regular expressions.
*/
#include "cvc5_private.h"
#ifndef CVC5__THEORY__STRINGS__REGEXP_ENUMERATOR_H
#define CVC5__THEORY__STRINGS__REGEXP_ENUMERATOR_H
#include <vector>
#include "expr/node.h"
#include "expr/type_node.h"
#include "theory/strings/type_enumerator.h"
namespace cvc5 {
namespace theory {
namespace strings {
/**
* Simple regular expression enumerator, generates only singleton language
* regular expressions from a string enumeration, in other words:
* (str.to_re s1) ... (str.to_re sn) ....
* where s1 ... sn ... is the enumeration for strings.
*/
class RegExpEnumerator : public TypeEnumeratorBase<RegExpEnumerator>
{
public:
RegExpEnumerator(TypeNode type, TypeEnumeratorProperties* tep = nullptr);
RegExpEnumerator(const RegExpEnumerator& enumerator);
~RegExpEnumerator() {}
/** get the current term */
Node operator*() override;
/** increment */
RegExpEnumerator& operator++() override;
/** is this enumerator finished? */
bool isFinished() override;
private:
/** underlying string enumerator */
StringEnumerator d_senum;
};
} // namespace strings
} // namespace theory
} // namespace cvc5
#endif /* CVC5__THEORY__STRINGS__TYPE_ENUMERATOR_H */
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