boost/xpressive/detail/static/transforms/as_inverse.hpp
///////////////////////////////////////////////////////////////////////////////
// as_inverse.hpp
//
// Copyright 2007 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_STATIC_TRANSFORMS_AS_INVERSE_HPP_EAN_04_05_2007
#define BOOST_XPRESSIVE_DETAIL_STATIC_TRANSFORMS_AS_INVERSE_HPP_EAN_04_05_2007
// MS compatible compilers support #pragma once
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif
#include <boost/mpl/sizeof.hpp>
#include <boost/xpressive/detail/detail_fwd.hpp>
#include <boost/xpressive/detail/static/static.hpp>
#include <boost/xpressive/proto/proto.hpp>
namespace boost { namespace xpressive { namespace detail
{
template<typename T>
struct inverter
{
typedef T type;
static T call(T t)
{
t.inverse();
return t;
}
};
template<typename Traits, bool ICase, bool Not>
struct inverter<literal_matcher<Traits, ICase, Not> >
{
typedef literal_matcher<Traits, ICase, !Not> type;
static type call(literal_matcher<Traits, ICase, Not> t)
{
return type(t);
}
};
template<typename Traits>
struct inverter<logical_newline_matcher<Traits> >
{
// ~_ln matches any one character that is not in the "newline" character class
typedef posix_charset_matcher<Traits> type;
static type call(logical_newline_matcher<Traits> t)
{
return type(t.newline(), true);
}
};
template<typename Traits>
struct inverter<assert_word_matcher<word_boundary<true>, Traits> >
{
typedef assert_word_matcher<word_boundary<false>, Traits> type;
static type call(assert_word_matcher<word_boundary<true>, Traits> t)
{
return type(t.word());
}
};
template<typename T>
typename inverter<T>::type invert(T const &t)
{
return inverter<T>::call(t);
}
template<typename Grammar>
struct as_inverse
: Grammar
{
as_inverse();
template<typename Expr, typename State, typename Visitor>
struct apply
: inverter<typename Grammar::template apply<Expr, State, Visitor>::type>
{};
template<typename Expr, typename State, typename Visitor>
static typename apply<Expr, State, Visitor>::type
call(Expr const &expr, State const &state, Visitor &visitor)
{
return detail::invert(Grammar::call(expr, state, visitor));
}
};
}}}
#endif