//  Copyright (c) 2001-2010 Hartmut Kaiser
//  Copyright (c) 2001-2010 Joel de Guzman
//
//  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)

#if !defined(BOOST_SPIRIT_PARSE_SEXPR_IMPL)
#define BOOST_SPIRIT_PARSE_SEXPR_IMPL

#include <iostream>
#include <string>
#include <boost/spirit/include/support_istream_iterator.hpp>
#include <boost/spirit/include/support_line_pos_iterator.hpp>
#include <boost/spirit/include/qi_parse.hpp>

#include <input/sexpr.hpp>
#include <input/parse_sexpr.hpp>

namespace scheme { namespace input
{
    ///////////////////////////////////////////////////////////////////////////
    template <typename Char>
    bool parse_sexpr(
        std::basic_istream<Char>& is,
        utree& result,
        std::string const& source_file)
    {
        // no white space skipping in the stream!
        is.unsetf(std::ios::skipws);

        typedef
            boost::spirit::basic_istream_iterator<Char>
        stream_iterator_type;
        stream_iterator_type sfirst(is);
        stream_iterator_type slast;

        typedef boost::spirit::line_pos_iterator<stream_iterator_type>
          iterator_type;
        iterator_type first(sfirst);
        iterator_type last(slast);

        scheme::input::sexpr<iterator_type> p(source_file);
        scheme::input::sexpr_white_space<iterator_type> ws;

        using boost::spirit::qi::phrase_parse;
        return phrase_parse(first, last, p, ws, result);
    }

    ///////////////////////////////////////////////////////////////////////////
    template <typename Char>
    bool parse_sexpr_list(
        std::basic_istream<Char>& is,
        utree& result,
        std::string const& source_file)
    {
        // no white space skipping in the stream!
        is.unsetf(std::ios::skipws);

        typedef
            boost::spirit::basic_istream_iterator<Char>
        stream_iterator_type;
        stream_iterator_type sfirst(is);
        stream_iterator_type slast;

        typedef boost::spirit::line_pos_iterator<stream_iterator_type>
          iterator_type;
        iterator_type first(sfirst);
        iterator_type last(slast);

        scheme::input::sexpr<iterator_type> p(source_file);
        scheme::input::sexpr_white_space<iterator_type> ws;

        using boost::spirit::qi::phrase_parse;
        bool ok = phrase_parse(first, last, +p, ws, result);
        result.tag(1); // line
        return ok;
    }

    ///////////////////////////////////////////////////////////////////////////
    template <typename Range>
    typename boost::disable_if<boost::is_base_of<std::ios_base, Range>, bool>::type
    parse_sexpr(
        Range const& rng,
        utree& result,
        std::string const& source_file)
    {
        typedef boost::spirit::line_pos_iterator<typename Range::const_iterator>
          iterator_type;

        scheme::input::sexpr<iterator_type> p(source_file);
        scheme::input::sexpr_white_space<iterator_type> ws;

        iterator_type first(rng.begin());
        iterator_type last(rng.end());

        using boost::spirit::qi::phrase_parse;
        return phrase_parse(first, last, p, ws, result);
    }

    template <typename Range>
    typename boost::disable_if<boost::is_base_of<std::ios_base, Range>, bool>::type
    parse_sexpr_list(
        Range const& rng,
        utree& result,
        std::string const& source_file)
    {
        typedef boost::spirit::line_pos_iterator<typename Range::const_iterator>
          iterator_type;

        scheme::input::sexpr<iterator_type> p(source_file);
        scheme::input::sexpr_white_space<iterator_type> ws;

        iterator_type first(rng.begin());
        iterator_type last(rng.end());

        using boost::spirit::qi::phrase_parse;
        bool ok = phrase_parse(first, last, +p, ws, result);
        result.tag(1); // line
        return ok;
    }

    ///////////////////////////////////////////////////////////////////////////
    bool parse_sexpr(
        utree const& in,
        utree& result,
        std::string const& source_file)
    {
        return parse_sexpr(in.get<utf8_string_range_type>(), result, source_file);
    }

    bool parse_sexpr_list(
        utree const& in,
        utree& result,
        std::string const& source_file)
    {
        return parse_sexpr_list(in.get<utf8_string_range_type>(), result, source_file);
    }
}}

#endif