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

 * 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);

  /** 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 */