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
