third_party/boost/spirit/include/boost/spirit/home/x3/string/literal_string.hpp

/*=============================================================================
    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_LITERAL_STRING_APR_18_2006_1125PM)
#define BOOST_SPIRIT_X3_LITERAL_STRING_APR_18_2006_1125PM

#include <boost/spirit/home/x3/core/parser.hpp>
#include <boost/spirit/home/x3/core/skip_over.hpp>
#include <boost/spirit/home/x3/string/detail/string_parse.hpp>
#include <boost/spirit/home/x3/support/no_case.hpp>
#include <boost/spirit/home/x3/support/utility/utf8.hpp>
#include <boost/spirit/home/support/char_encoding/ascii.hpp>
#include <boost/spirit/home/support/char_encoding/standard.hpp>
#include <boost/spirit/home/support/char_encoding/standard_wide.hpp>

#include <boost/type_traits/is_same.hpp>
#include <boost/type_traits/add_reference.hpp>
#include <string>

namespace boost { namespace spirit { namespace x3
{
    template <typename String, typename Encoding,
        typename Attribute = std::basic_string<typename Encoding::char_type>>
    struct literal_string : parser<literal_string<String, 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;
        static bool const handles_container = has_attribute;

        constexpr literal_string(typename add_reference< typename add_const<String>::type >::type str)
          : str(str)
        {}

        template <typename Iterator, typename Context, typename Attribute_>
        bool parse(Iterator& first, Iterator const& last
          , Context const& context, unused_type, Attribute_& attr) const
        {
            x3::skip_over(first, last, context);
            return detail::string_parse(str, first, last, attr, get_case_compare<encoding>(context));
        }

        String str;
    };

    namespace standard
    {
        constexpr literal_string<char const*, char_encoding::standard>
        string(char const* s)
        {
            return { s };
        }

        inline literal_string<std::basic_string<char>, char_encoding::standard>
        string(std::basic_string<char> const& s)
        {
            return { s };
        }

        inline constexpr literal_string<char const*, char_encoding::standard, unused_type>
        lit(char const* s)
        {
            return { s };
        }

        template <typename Char>
        literal_string<std::basic_string<Char>, char_encoding::standard, unused_type>
        lit(std::basic_string<Char> const& s)
        {
            return { s };
        }
    }

#ifndef BOOST_SPIRIT_NO_STANDARD_WIDE
    namespace standard_wide
    {
        constexpr literal_string<wchar_t const*, char_encoding::standard_wide>
        string(wchar_t const* s)
        {
            return { s };
        }

        inline literal_string<std::basic_string<wchar_t>, char_encoding::standard_wide>
        string(std::basic_string<wchar_t> const& s)
        {
            return { s };
        }

        constexpr literal_string<wchar_t const*, char_encoding::standard_wide, unused_type>
        lit(wchar_t const* s)
        {
            return { s };
        }

        inline literal_string<std::basic_string<wchar_t>, char_encoding::standard_wide, unused_type>
        lit(std::basic_string<wchar_t> const& s)
        {
            return { s };
        }
    }
#endif

#if defined(BOOST_SPIRIT_X3_UNICODE)
    namespace unicode
    {
        constexpr literal_string<char32_t const*, char_encoding::unicode>
        string(char32_t const* s)
        {
            return { s };
        }

        inline literal_string<std::basic_string<char32_t>, char_encoding::unicode>
        string(std::basic_string<char32_t> const& s)
        {
            return { s };
        }

        constexpr literal_string<char32_t const*, char_encoding::unicode, unused_type>
        lit(char32_t const* s)
        {
            return { s };
        }

        inline literal_string<std::basic_string<char32_t>, char_encoding::unicode, unused_type>
        lit(std::basic_string<char32_t> const& s)
        {
            return { s };
        }
    }
#endif

    namespace ascii
    {
        constexpr literal_string<wchar_t const*, char_encoding::ascii>
        string(wchar_t const* s)
        {
            return { s };
        }

        inline literal_string<std::basic_string<wchar_t>, char_encoding::ascii>
        string(std::basic_string<wchar_t> const& s)
        {
            return { s };
        }

        constexpr literal_string<char const*, char_encoding::ascii, unused_type>
        lit(char const* s)
        {
            return { s };
        }

        template <typename Char>
        literal_string<std::basic_string<Char>, char_encoding::ascii, unused_type>
        lit(std::basic_string<Char> const& s)
        {
            return { s };
        }
    }

    namespace iso8859_1
    {
        constexpr literal_string<wchar_t const*, char_encoding::iso8859_1>
        string(wchar_t const* s)
        {
            return { s };
        }

        inline literal_string<std::basic_string<wchar_t>, char_encoding::iso8859_1>
        string(std::basic_string<wchar_t> const& s)
        {
            return { s };
        }

        constexpr literal_string<char const*, char_encoding::iso8859_1, unused_type>
        lit(char const* s)
        {
            return { s };
        }

        template <typename Char>
        literal_string<std::basic_string<Char>, char_encoding::iso8859_1, unused_type>
        lit(std::basic_string<Char> const& s)
        {
            return { s };
        }
    }

    using standard::string;
    using standard::lit;
#ifndef BOOST_SPIRIT_NO_STANDARD_WIDE
    using standard_wide::string;
    using standard_wide::lit;
#endif

    namespace extension
    {
        template <int N>
        struct as_parser<char[N]>
        {
            typedef literal_string<
                char const*, char_encoding::standard, unused_type>
            type;

            typedef type value_type;

            static constexpr type call(char const* s)
            {
                return type(s);
            }
        };

        template <int N>
        struct as_parser<char const[N]> : as_parser<char[N]> {};

#ifndef BOOST_SPIRIT_NO_STANDARD_WIDE
        template <int N>
        struct as_parser<wchar_t[N]>
        {
            typedef literal_string<
                wchar_t const*, char_encoding::standard_wide, unused_type>
            type;

            typedef type value_type;

            static constexpr type call(wchar_t const* s)
            {
                return type(s);
            }
        };

        template <int N>
        struct as_parser<wchar_t const[N]> : as_parser<wchar_t[N]> {};
#endif

        template <>
        struct as_parser<char const*>
        {
            typedef literal_string<
                char const*, char_encoding::standard, unused_type>
            type;

            typedef type value_type;

            static constexpr type call(char const* s)
            {
                return type(s);
            }
        };

        template <typename Char>
        struct as_parser< std::basic_string<Char> >
        {
            typedef literal_string<
                Char const*, char_encoding::standard, unused_type>
            type;

            typedef type value_type;

            static type call(std::basic_string<Char> const& s)
            {
                return type(s.c_str());
            }
        };
    }

    template <typename String, typename Encoding, typename Attribute>
    struct get_info<literal_string<String, Encoding, Attribute>>
    {
        typedef std::string result_type;
        std::string operator()(literal_string<String, Encoding, Attribute> const& p) const
        {
            return '"' + to_utf8(p.str) + '"';
        }
    };
}}}

#endif