241 lines
8.0 KiB
C++
241 lines
8.0 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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// transmogrify.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_TRANSMOGRIFY_HPP_EAN_10_04_2005
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#define BOOST_XPRESSIVE_DETAIL_STATIC_TRANSMOGRIFY_HPP_EAN_10_04_2005
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// MS compatible compilers support #pragma once
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#if defined(_MSC_VER) && (_MSC_VER >= 1020)
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# pragma once
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#endif
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#include <cstring> // for std::strlen
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#include <boost/mpl/if.hpp>
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#include <boost/mpl/or.hpp>
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#include <boost/mpl/bool.hpp>
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#include <boost/mpl/assert.hpp>
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#include <boost/type_traits/is_same.hpp>
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#include <boost/xpressive/detail/detail_fwd.hpp>
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#include <boost/xpressive/detail/core/matchers.hpp>
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#include <boost/xpressive/detail/static/placeholders.hpp>
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#include <boost/xpressive/detail/utility/dont_care.hpp>
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#include <boost/xpressive/detail/utility/traits_utils.hpp>
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namespace boost { namespace xpressive { namespace detail
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{
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template<typename T, typename Char>
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struct is_char_literal
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: mpl::or_<is_same<T, Char>, is_same<T, char> >
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{};
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///////////////////////////////////////////////////////////////////////////////
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// transmogrify
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//
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template<typename BidiIter, typename ICase, typename Traits, typename Matcher, typename EnableIf = void>
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struct default_transmogrify
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{
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typedef typename Traits::char_type char_type;
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typedef typename Traits::string_type string_type;
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typedef typename mpl::if_c
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<
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is_char_literal<Matcher, char_type>::value
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, literal_matcher<Traits, ICase, mpl::false_>
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, string_matcher<Traits, ICase>
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>::type type;
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template<typename Matcher2, typename Visitor>
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static type call(Matcher2 const &m, Visitor &visitor)
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{
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return default_transmogrify::call_(m, visitor, is_char_literal<Matcher2, char_type>());
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}
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template<typename Matcher2, typename Visitor>
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static type call_(Matcher2 const &m, Visitor &visitor, mpl::true_)
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{
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char_type ch = char_cast<char_type>(m, visitor.traits());
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return type(ch, visitor.traits());
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}
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template<typename Matcher2, typename Visitor>
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static type call_(Matcher2 const &m, Visitor &visitor, mpl::false_)
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{
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string_type str = string_cast<string_type>(m, visitor.traits());
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return type(str, visitor.traits());
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}
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};
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template<typename BidiIter, typename ICase, typename Traits, typename Matcher>
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struct default_transmogrify<BidiIter, ICase, Traits, Matcher, typename Matcher::is_boost_xpressive_xpression_>
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{
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typedef Matcher type;
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template<typename Matcher2>
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static Matcher2 const &call(Matcher2 const &m, dont_care)
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{
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return m;
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}
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};
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template<typename BidiIter, typename ICase, typename Traits, typename Matcher>
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struct transmogrify
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: default_transmogrify<BidiIter, ICase, Traits, Matcher>
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{};
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template<typename BidiIter, typename ICase, typename Traits>
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struct transmogrify<BidiIter, ICase, Traits, assert_bol_placeholder >
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{
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typedef assert_bol_matcher<Traits> type;
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template<typename Matcher2, typename Visitor>
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static type call(Matcher2, Visitor &visitor)
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{
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return type(visitor.traits());
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}
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};
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template<typename BidiIter, typename ICase, typename Traits>
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struct transmogrify<BidiIter, ICase, Traits, assert_eol_placeholder >
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{
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typedef assert_eol_matcher<Traits> type;
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template<typename Matcher2, typename Visitor>
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static type call(Matcher2, Visitor &visitor)
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{
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return type(visitor.traits());
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}
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};
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template<typename BidiIter, typename ICase, typename Traits>
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struct transmogrify<BidiIter, ICase, Traits, logical_newline_placeholder >
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{
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typedef logical_newline_matcher<Traits> type;
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template<typename Matcher2, typename Visitor>
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static type call(Matcher2, Visitor &visitor)
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{
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return type(visitor.traits());
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}
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};
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template<typename BidiIter, typename ICase, typename Traits, typename Char>
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struct transmogrify<BidiIter, ICase, Traits, range_placeholder<Char> >
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{
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// By design, we don't widen character ranges.
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typedef typename iterator_value<BidiIter>::type char_type;
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BOOST_MPL_ASSERT((is_same<Char, char_type>));
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typedef range_matcher<Traits, ICase> type;
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template<typename Matcher2, typename Visitor>
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static type call(Matcher2 const &m, Visitor &visitor)
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{
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return type(m.ch_min_, m.ch_max_, m.not_, visitor.traits());
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}
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};
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template<typename BidiIter, typename ICase, typename Traits>
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struct transmogrify<BidiIter, ICase, Traits, mark_placeholder >
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{
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typedef mark_matcher<Traits, ICase> type;
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template<typename Matcher2, typename Visitor>
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static type call(Matcher2 const &m, Visitor &visitor)
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{
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return type(m.mark_number_, visitor.traits());
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}
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};
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template<typename BidiIter, typename ICase, typename Traits>
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struct transmogrify<BidiIter, ICase, Traits, posix_charset_placeholder >
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{
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typedef posix_charset_matcher<Traits> type;
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template<typename Matcher2, typename Visitor>
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static type call(Matcher2 const &m, Visitor &visitor)
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{
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char const *name_end = m.name_ + std::strlen(m.name_);
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return type(visitor.traits().lookup_classname(m.name_, name_end, ICase::value), m.not_);
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}
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};
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template<typename BidiIter, typename Traits, typename Size>
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struct transmogrify<BidiIter, mpl::true_, Traits, set_matcher<Traits, Size> >
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{
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typedef set_matcher<Traits, Size> type;
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template<typename Matcher2, typename Visitor>
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static type call(Matcher2 m, Visitor &visitor)
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{
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m.nocase(visitor.traits());
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return m;
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}
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};
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template<typename BidiIter, typename ICase, typename Traits, typename Cond>
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struct transmogrify<BidiIter, ICase, Traits, assert_word_placeholder<Cond> >
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{
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typedef assert_word_matcher<Cond, Traits> type;
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template<typename Visitor>
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static type call(dont_care, Visitor &visitor)
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{
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return type(visitor.traits());
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}
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};
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template<typename BidiIter, typename ICase, typename Traits>
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struct transmogrify<BidiIter, ICase, Traits, reference_wrapper<basic_regex<BidiIter> > >
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{
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typedef regex_byref_matcher<BidiIter> type;
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template<typename Matcher2>
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static type call(Matcher2 const &m, dont_care)
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{
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return type(detail::core_access<BidiIter>::get_regex_impl(m.get()));
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}
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};
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template<typename BidiIter, typename ICase, typename Traits>
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struct transmogrify<BidiIter, ICase, Traits, reference_wrapper<basic_regex<BidiIter> const> >
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{
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typedef regex_byref_matcher<BidiIter> type;
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template<typename Matcher2>
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static type call(Matcher2 const &m, dont_care)
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{
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return type(detail::core_access<BidiIter>::get_regex_impl(m.get()));
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}
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};
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template<typename BidiIter, typename ICase, typename Traits>
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struct transmogrify<BidiIter, ICase, Traits, tracking_ptr<regex_impl<BidiIter> > >
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{
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typedef regex_matcher<BidiIter> type;
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template<typename Matcher2>
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static type call(Matcher2 const &m, dont_care)
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{
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return type(m.get());
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}
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};
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template<typename BidiIter, typename ICase, typename Traits>
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struct transmogrify<BidiIter, ICase, Traits, self_placeholder >
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{
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typedef regex_byref_matcher<BidiIter> type;
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template<typename Matcher2, typename Visitor>
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static type call(Matcher2, Visitor &visitor)
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{
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return type(visitor.self());
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}
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};
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}}}
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#endif
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