// Copyright (c) 2001-2011 Hartmut Kaiser | |
// Copyright (c) 2001-2011 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_GET_ENCODING_JANUARY_13_2009_1255PM) | |
#define BOOST_SPIRIT_GET_ENCODING_JANUARY_13_2009_1255PM | |
#if defined(_MSC_VER) | |
#pragma once | |
#endif | |
#include <boost/mpl/identity.hpp> | |
#include <boost/type_traits/is_same.hpp> | |
namespace boost { namespace spirit { namespace detail | |
{ | |
template <typename Modifiers, typename Encoding> | |
struct get_implicit_encoding | |
{ | |
// Extract the implicit encoding from the Modifiers | |
// If one is not found, Encoding is used. The explicit | |
// encoding is the first viable encoding that can be | |
// extracted from the Modifiers (there can be more than one). | |
typedef typename | |
mpl::find_if< | |
char_encodings, | |
has_modifier<Modifiers, tag::char_encoding_base<mpl::_1> > | |
>::type | |
iter; | |
typedef typename | |
mpl::eval_if< | |
is_same<iter, typename mpl::end<char_encodings>::type>, | |
mpl::identity<Encoding>, | |
mpl::deref<iter> | |
>::type | |
type; | |
}; | |
template <typename Modifiers, typename Encoding> | |
struct get_encoding | |
{ | |
// Extract the explicit encoding from the Modifiers | |
// If one is not found, get implicit encoding (see above). | |
// Explicit encoding is the encoding explicitly declared | |
// using the encoding[c] directive. | |
typedef typename | |
mpl::find_if< | |
char_encodings, | |
has_modifier<Modifiers, tag::char_code<tag::encoding, mpl::_1> > | |
>::type | |
iter; | |
typedef typename | |
mpl::eval_if< | |
is_same<iter, typename mpl::end<char_encodings>::type>, | |
get_implicit_encoding<Modifiers, Encoding>, | |
mpl::deref<iter> | |
>::type | |
type; | |
}; | |
template <typename Modifiers, typename Encoding, bool case_modifier = false> | |
struct get_encoding_with_case : mpl::identity<Encoding> {}; | |
template <typename Modifiers, typename Encoding> | |
struct get_encoding_with_case<Modifiers, Encoding, true> | |
: get_encoding<Modifiers, Encoding> {}; | |
}}} | |
#endif |