/*============================================================================= | |
Copyright (c) 2002-2003 Joel de Guzman | |
Copyright (c) 2002-2003 Hartmut Kaiser | |
http://spirit.sourceforge.net/ | |
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_AS_PARSER_HPP) | |
#define BOOST_SPIRIT_AS_PARSER_HPP | |
#include <boost/spirit/home/classic/namespace.hpp> | |
#include <boost/spirit/home/classic/core/primitives/primitives.hpp> | |
namespace boost { namespace spirit { | |
BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN | |
/////////////////////////////////////////////////////////////////////////// | |
// | |
// Helper templates to derive the parser type from an auxilliary type | |
// and to generate an object of the required parser type given an | |
// auxilliary object. Supported types to convert are parsers, | |
// single characters and character strings. | |
// | |
/////////////////////////////////////////////////////////////////////////// | |
namespace impl | |
{ | |
template<typename T> | |
struct default_as_parser | |
{ | |
typedef T type; | |
static type const& convert(type const& p) | |
{ | |
return p; | |
} | |
}; | |
struct char_as_parser | |
{ | |
typedef chlit<char> type; | |
static type convert(char ch) | |
{ | |
return type(ch); | |
} | |
}; | |
struct wchar_as_parser | |
{ | |
typedef chlit<wchar_t> type; | |
static type convert(wchar_t ch) | |
{ | |
return type(ch); | |
} | |
}; | |
struct string_as_parser | |
{ | |
typedef strlit<char const*> type; | |
static type convert(char const* str) | |
{ | |
return type(str); | |
} | |
}; | |
struct wstring_as_parser | |
{ | |
typedef strlit<wchar_t const*> type; | |
static type convert(wchar_t const* str) | |
{ | |
return type(str); | |
} | |
}; | |
} | |
template<typename T> | |
struct as_parser : impl::default_as_parser<T> {}; | |
template<> | |
struct as_parser<char> : impl::char_as_parser {}; | |
template<> | |
struct as_parser<wchar_t> : impl::wchar_as_parser {}; | |
template<> | |
struct as_parser<char*> : impl::string_as_parser {}; | |
template<> | |
struct as_parser<char const*> : impl::string_as_parser {}; | |
template<> | |
struct as_parser<wchar_t*> : impl::wstring_as_parser {}; | |
template<> | |
struct as_parser<wchar_t const*> : impl::wstring_as_parser {}; | |
template<int N> | |
struct as_parser<char[N]> : impl::string_as_parser {}; | |
template<int N> | |
struct as_parser<wchar_t[N]> : impl::wstring_as_parser {}; | |
template<int N> | |
struct as_parser<char const[N]> : impl::string_as_parser {}; | |
template<int N> | |
struct as_parser<wchar_t const[N]> : impl::wstring_as_parser {}; | |
BOOST_SPIRIT_CLASSIC_NAMESPACE_END | |
}} // namespace BOOST_SPIRIT_CLASSIC_NS | |
#endif |