/*=============================================================================
    Copyright (c) 2001-2014 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_X3_CHAR_SET_OCT_12_2014_1051AM)
#define BOOST_SPIRIT_X3_CHAR_SET_OCT_12_2014_1051AM

#include <boost/spirit/home/x3/char/char_parser.hpp>
#include <boost/spirit/home/x3/char/detail/cast_char.hpp>
#include <boost/spirit/home/x3/support/traits/string_traits.hpp>
#include <boost/spirit/home/x3/support/utility/utf8.hpp>
#include <boost/spirit/home/x3/support/no_case.hpp>
#include <boost/spirit/home/support/char_set/basic_chset.hpp>

#include <boost/type_traits/is_same.hpp>

namespace boost {
namespace spirit {
namespace x3 {
///////////////////////////////////////////////////////////////////////////
// Parser for a character range
///////////////////////////////////////////////////////////////////////////
template <typename Encoding, typename Attribute = typename Encoding::char_type>
struct char_range
    : char_parser< char_range<Encoding, Attribute> >
{

    typedef typename Encoding::char_type char_type;
    typedef Encoding encoding;
    typedef Attribute attribute_type;
    static bool const has_attribute =
        !is_same<unused_type, attribute_type>::value;

    constexpr
    char_range(char_type from_, char_type to_)
        : from(from_), to(to_) {}

    template <typename Char, typename Context>
    bool
    test(Char ch_, Context const& context) const
    {

        char_type ch = char_type(ch_);  // optimize for token based parsing
        return (get_case_compare<encoding>(context)(ch, from) >= 0)
               && (get_case_compare<encoding>(context)(ch, to) <= 0);
    }

    char_type from, to;
};

///////////////////////////////////////////////////////////////////////////
// Parser for a character set
///////////////////////////////////////////////////////////////////////////
template <typename Encoding, typename Attribute = typename Encoding::char_type>
struct char_set : char_parser<char_set<Encoding, Attribute>>
{
    typedef typename Encoding::char_type char_type;
    typedef Encoding encoding;
    typedef Attribute attribute_type;
    static bool const has_attribute =
        !is_same<unused_type, attribute_type>::value;

    template <typename String>
    char_set(String const& str)
    {
        using spirit::x3::detail::cast_char;

        auto* definition = traits::get_c_string(str);
        auto ch = *definition++;

        while (ch)
        {
            auto next = *definition++;

            if (next == '-')
            {
                next = *definition++;

                if (next == 0)
                {
                    chset.set(cast_char<char_type>(ch));
                    chset.set('-');
                    break;
                }

                chset.set(
                    cast_char<char_type>(ch),
                    cast_char<char_type>(next)
                );
            }

            else
            {
                chset.set(cast_char<char_type>(ch));
            }

            ch = next;
        }
    }

    template <typename Char, typename Context>
    bool
    test(Char ch_, Context const& context) const
    {
        return get_case_compare<encoding>(context).in_set(ch_, chset);
    }

    support::detail::basic_chset<char_type> chset;
};

template <typename Encoding, typename Attribute>
struct get_info<char_set<Encoding, Attribute>>
{
    typedef std::string result_type;
    std::string
    operator()(char_set<Encoding, Attribute> const& /* p */) const
    {
        return "char-set";
    }
};

template <typename Encoding, typename Attribute>
struct get_info<char_range<Encoding, Attribute>>
{
    typedef std::string result_type;
    std::string
    operator()(char_range<Encoding, Attribute> const& p) const
    {
        return "char_range \"" + to_utf8(Encoding::toucs4(p.from)) + '-' + to_utf8(Encoding::toucs4(p.to))+ '"';
    }
};

}
}
}

#endif
