You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
146 lines
4.3 KiB
146 lines
4.3 KiB
///////////////////////////////////////////////////////////////////////////////
|
|
// traits_utils.hpp
|
|
//
|
|
// Copyright 2008 Eric Niebler. 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)
|
|
|
|
#ifndef BOOST_XPRESSIVE_DETAIL_UTILITY_TRAITS_UTILS_HPP_EAN_10_04_2005
|
|
#define BOOST_XPRESSIVE_DETAIL_UTILITY_TRAITS_UTILS_HPP_EAN_10_04_2005
|
|
|
|
// MS compatible compilers support #pragma once
|
|
#if defined(_MSC_VER)
|
|
# pragma once
|
|
# pragma warning(push)
|
|
# pragma warning(disable : 4100) // unreferenced formal parameter
|
|
#endif
|
|
|
|
#include <string>
|
|
#include <boost/mpl/bool.hpp>
|
|
#include <boost/mpl/assert.hpp>
|
|
#include <boost/utility/enable_if.hpp>
|
|
#include <boost/type_traits/is_same.hpp>
|
|
#include <boost/iterator/transform_iterator.hpp>
|
|
#include <boost/xpressive/detail/utility/algorithm.hpp>
|
|
|
|
namespace boost { namespace xpressive { namespace detail
|
|
{
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
// char_cast
|
|
//
|
|
template<typename ToChar, typename FromChar, typename Traits>
|
|
inline ToChar
|
|
char_cast(FromChar from, Traits const &, typename enable_if<is_same<ToChar, FromChar> >::type * = 0)
|
|
{
|
|
return from;
|
|
}
|
|
|
|
template<typename ToChar, typename FromChar, typename Traits>
|
|
inline ToChar
|
|
char_cast(FromChar from, Traits const &tr, typename disable_if<is_same<ToChar, FromChar> >::type * = 0)
|
|
{
|
|
BOOST_MPL_ASSERT((is_same<FromChar, char>));
|
|
return tr.widen(from);
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
// widen_fun
|
|
//
|
|
template<typename Traits>
|
|
struct widen_fun
|
|
{
|
|
typedef typename Traits::char_type result_type;
|
|
explicit widen_fun(Traits const &tr)
|
|
: traits_(tr)
|
|
{}
|
|
|
|
result_type operator()(char ch) const
|
|
{
|
|
return this->traits_.widen(ch);
|
|
}
|
|
|
|
Traits const &traits_;
|
|
};
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
// string_cast_
|
|
//
|
|
template<
|
|
typename To
|
|
, typename From
|
|
, typename ToChar = typename detail::range_data<To>::type
|
|
, typename FromChar = typename detail::range_data<From>::type
|
|
>
|
|
struct string_cast_
|
|
{
|
|
BOOST_MPL_ASSERT((is_same<FromChar, char>));
|
|
typedef To const result_type;
|
|
template<typename Traits>
|
|
result_type operator()(From const &from, Traits const &tr) const
|
|
{
|
|
widen_fun<Traits> widen(tr);
|
|
To to(
|
|
boost::make_transform_iterator(detail::data_begin(from), widen)
|
|
, boost::make_transform_iterator(detail::data_end(from), widen)
|
|
);
|
|
return to;
|
|
}
|
|
};
|
|
|
|
template<typename To, typename From, typename Char>
|
|
struct string_cast_<To, From, Char, Char>
|
|
{
|
|
typedef To const result_type;
|
|
template<typename Traits>
|
|
result_type operator()(From const &from, Traits const &) const
|
|
{
|
|
To to(detail::data_begin(from), detail::data_end(from));
|
|
return to;
|
|
}
|
|
};
|
|
|
|
template<typename From, typename Char>
|
|
struct string_cast_<From, From, Char, Char>
|
|
{
|
|
typedef From const &result_type;
|
|
template<typename Traits>
|
|
result_type operator()(From const &from, Traits const &) const
|
|
{
|
|
return from;
|
|
}
|
|
};
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
// string_cast
|
|
//
|
|
template<typename To, typename From, typename Traits>
|
|
typename string_cast_<To, From>::result_type
|
|
string_cast(From const &from, Traits const &tr)
|
|
{
|
|
return string_cast_<To, From>()(from, tr);
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
// translate
|
|
//
|
|
template<typename Char, typename Traits>
|
|
inline Char translate(Char ch, Traits const &tr, mpl::false_) // case-sensitive
|
|
{
|
|
return tr.translate(ch);
|
|
}
|
|
|
|
template<typename Char, typename Traits>
|
|
inline Char translate(Char ch, Traits const &tr, mpl::true_) // case-insensitive
|
|
{
|
|
return tr.translate_nocase(ch);
|
|
}
|
|
|
|
}}} // namespace boost::xpressive::detail
|
|
|
|
#if defined(_MSC_VER)
|
|
# pragma warning(pop)
|
|
#endif
|
|
|
|
#endif
|