// Copyright (C) 2003, 2004, 2005, 2006 Laboratoire d'Informatique de
// Paris 6 (LIP6), département Systèmes Répartis Coopératifs (SRC),
// Université Pierre et Marie Curie.
//
// This file is part of Spot, a model checking library.
//
// Spot is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// Spot is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
// or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
// License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Spot; see the file COPYING.  If not, write to the Free
// Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
// 02111-1307, USA.

#ifndef SPOT_LTLPARSE_PUBLIC_HH
# define SPOT_LTLPARSE_PUBLIC_HH

# include "ltlast/formula.hh"
// Unfortunately Bison 2.3 uses the same guards in all parsers :(
# undef BISON_LOCATION_HH
# undef BISON_POSITION_HH
# include "ltlparse/location.hh"
# include "ltlenv/defaultenv.hh"
# include <string>
# include <list>
# include <utility>
# include <iosfwd>

namespace spot
{
  namespace ltl
  {
    /// \addtogroup ltl_io
    /// @{

    /// \brief A parse diagnostic with its location.
    typedef std::pair<ltlyy::location, std::string> parse_error;
    /// \brief A list of parser diagnostics, as filled by parse.
    typedef std::list<parse_error> parse_error_list;


    /// \brief Build a formula from an LTL string.
    /// \param ltl_string The string to parse.
    /// \param error_list A list that will be filled with
    ///        parse errors that occured during parsing.
    /// \param env The environment into which parsing should take place.
    /// \param debug When true, causes the parser to trace its execution.
    /// \return A pointer to the formula built from \a ltl_string, or
    ///        0 if the input was unparsable.
    ///
    /// Note that the parser usually tries to recover from errors.  It can
    /// return an non zero value even if it encountered error during the
    /// parsing of \a ltl_string.  If you want to make sure \a ltl_string
    /// was parsed succesfully, check \a error_list for emptiness.
    ///
    /// \warning This function is not reentrant.
    formula* parse(const std::string& ltl_string,
		   parse_error_list& error_list,
		   environment& env = default_environment::instance(),
		   bool debug = false);

    /// \brief Format diagnostics produced by spot::ltl::parse.
    /// \param os Where diagnostics should be output.
    /// \param ltl_string The string that were parsed.
    /// \param error_list The error list filled by spot::ltl::parse while
    ///        parsing \a ltl_string.
    /// \return \c true iff any diagnostic was output.
    bool format_parse_errors(std::ostream& os,
			     const std::string& ltl_string,
			     parse_error_list& error_list);

    /// @}
  }
}

#endif // SPOT_LTLPARSE_PUBLIC_HH