identifier_generator.h

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// Author(s): Wieger Wesselink
// Copyright: see the accompanying file COPYING or copy at
// https://github.com/mCRL2org/mCRL2/blob/master/COPYING
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
 
#ifndef MCRL2_DATA_IDENTIFIER_GENERATOR_H
#define MCRL2_DATA_IDENTIFIER_GENERATOR_H
 
#include "mcrl2/core/identifier_string.h"
#include "mcrl2/utilities/number_postfix_generator.h"
 
namespace mcrl2
{
 
namespace data
{
 
template <typename Generator = utilities::number_postfix_generator>
class identifier_generator
{
  protected:
    Generator m_generator;
 
  public:
    identifier_generator() = default;
 
    virtual ~identifier_generator() = default;
 
    virtual void clear_context() = 0;
 
    virtual void add_identifier(const core::identifier_string& s) = 0;
 
    virtual void remove_identifier(const core::identifier_string& s) = 0;
 
    void add_identifiers(const std::set<core::identifier_string>& ids)
    {
      for (const core::identifier_string& id: ids)
      {
        add_identifier(id);
      }
    }
 
    void remove_identifiers(const std::set<core::identifier_string>& ids)
    {
      for (const core::identifier_string& id: ids)
      {
        remove_identifier(id);
      }
    }
 
    virtual bool has_identifier(const core::identifier_string& s) const = 0;
 
    virtual core::identifier_string operator()(const std::string& hint, bool add_to_context = true)
    {
      core::identifier_string id(add_to_context?hint:m_generator(hint));
      while (has_identifier(id))
      {
        id = core::identifier_string(m_generator(hint));
      }
      if (add_to_context)
      {
        add_identifier(id);
      }
      return id;
    }
};
 
} // namespace data
 
} // namespace mcrl2
 
#endif // MCRL2_DATA_IDENTIFIER_GENERATOR_H