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95 lines
2.7 KiB
95 lines
2.7 KiB
3 years ago
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///////////////////////////////////////////////////////////////////////////////
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// as_inverse.hpp
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//
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// Copyright 2008 Eric Niebler. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_XPRESSIVE_DETAIL_STATIC_TRANSFORMS_AS_INVERSE_HPP_EAN_04_05_2007
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#define BOOST_XPRESSIVE_DETAIL_STATIC_TRANSFORMS_AS_INVERSE_HPP_EAN_04_05_2007
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// MS compatible compilers support #pragma once
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#if defined(_MSC_VER)
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# pragma once
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#endif
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#include <boost/mpl/sizeof.hpp>
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#include <boost/mpl/not.hpp>
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#include <boost/xpressive/detail/detail_fwd.hpp>
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#include <boost/xpressive/detail/static/static.hpp>
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#include <boost/proto/core.hpp>
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#define UNCV(x) typename remove_const<x>::type
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#define UNREF(x) typename remove_reference<x>::type
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#define UNCVREF(x) UNCV(UNREF(x))
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namespace boost { namespace xpressive { namespace grammar_detail
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{
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template<typename T>
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struct inverter
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{
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typedef T type;
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static T call(T t)
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{
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t.inverse();
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return t;
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}
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};
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template<typename Traits, typename ICase, typename Not>
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struct inverter<detail::literal_matcher<Traits, ICase, Not> >
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{
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typedef detail::literal_matcher<Traits, ICase, typename mpl::not_<Not>::type> type;
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static type call(detail::literal_matcher<Traits, ICase, Not> t)
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{
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return type(t.ch_);
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}
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};
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template<typename Traits>
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struct inverter<detail::logical_newline_matcher<Traits> >
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{
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// ~_ln matches any one character that is not in the "newline" character class
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typedef detail::posix_charset_matcher<Traits> type;
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static type call(detail::logical_newline_matcher<Traits> t)
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{
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return type(t.newline(), true);
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}
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};
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template<typename Traits>
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struct inverter<detail::assert_word_matcher<detail::word_boundary<mpl::true_>, Traits> >
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{
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typedef detail::assert_word_matcher<detail::word_boundary<mpl::false_>, Traits> type;
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static type call(detail::assert_word_matcher<detail::word_boundary<mpl::true_>, Traits> t)
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{
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return type(t.word());
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}
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};
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struct as_inverse : proto::callable
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{
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template<typename Sig>
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struct result;
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template<typename This, typename Matcher>
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struct result<This(Matcher)>
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: inverter<UNCVREF(Matcher)>
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{};
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template<typename Matcher>
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typename inverter<Matcher>::type operator ()(Matcher const &matcher) const
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{
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return inverter<Matcher>::call(matcher);
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}
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};
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}}}
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#undef UNCV
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#undef UNREF
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#undef UNCVREF
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#endif
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