Chris@16: ///////////////////////////////////////////////////////////////////////////////
Chris@16: // transmogrify.hpp
Chris@16: //
Chris@16: //  Copyright 2008 Eric Niebler. Distributed under the Boost
Chris@16: //  Software License, Version 1.0. (See accompanying file
Chris@16: //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #ifndef BOOST_XPRESSIVE_DETAIL_STATIC_TRANSMOGRIFY_HPP_EAN_10_04_2005
Chris@16: #define BOOST_XPRESSIVE_DETAIL_STATIC_TRANSMOGRIFY_HPP_EAN_10_04_2005
Chris@16: 
Chris@16: // MS compatible compilers support #pragma once
Chris@101: #if defined(_MSC_VER)
Chris@16: # pragma once
Chris@16: #endif
Chris@16: 
Chris@16: #include <cstring> // for std::strlen
Chris@16: #include <boost/mpl/if.hpp>
Chris@16: #include <boost/mpl/or.hpp>
Chris@16: #include <boost/mpl/bool.hpp>
Chris@16: #include <boost/mpl/assert.hpp>
Chris@16: #include <boost/type_traits/is_same.hpp>
Chris@16: #include <boost/xpressive/detail/detail_fwd.hpp>
Chris@16: #include <boost/xpressive/detail/core/matchers.hpp>
Chris@16: #include <boost/xpressive/detail/static/placeholders.hpp>
Chris@16: #include <boost/xpressive/detail/utility/dont_care.hpp>
Chris@16: #include <boost/xpressive/detail/utility/traits_utils.hpp>
Chris@16: 
Chris@16: namespace boost { namespace xpressive { namespace detail
Chris@16: {
Chris@16:     template<typename T, typename Char>
Chris@16:     struct is_char_literal
Chris@16:       : mpl::or_<is_same<T, Char>, is_same<T, char> >
Chris@16:     {};
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////////
Chris@16:     // transmogrify
Chris@16:     //
Chris@16:     template<typename BidiIter, typename ICase, typename Traits, typename Matcher, typename EnableIf = void>
Chris@16:     struct default_transmogrify
Chris@16:     {
Chris@16:         typedef typename Traits::char_type char_type;
Chris@16:         typedef typename Traits::string_type string_type;
Chris@16: 
Chris@16:         typedef typename mpl::if_c
Chris@16:         <
Chris@16:             is_char_literal<Matcher, char_type>::value
Chris@16:           , literal_matcher<Traits, ICase, mpl::false_>
Chris@16:           , string_matcher<Traits, ICase>
Chris@16:         >::type type;
Chris@16: 
Chris@16:         template<typename Matcher2, typename Visitor>
Chris@16:         static type call(Matcher2 const &m, Visitor &visitor)
Chris@16:         {
Chris@16:             return default_transmogrify::call_(m, visitor, is_char_literal<Matcher2, char_type>());
Chris@16:         }
Chris@16: 
Chris@16:         template<typename Matcher2, typename Visitor>
Chris@16:         static type call_(Matcher2 const &m, Visitor &visitor, mpl::true_)
Chris@16:         {
Chris@16:             char_type ch = char_cast<char_type>(m, visitor.traits());
Chris@16:             return type(ch, visitor.traits());
Chris@16:         }
Chris@16: 
Chris@16:         template<typename Matcher2, typename Visitor>
Chris@16:         static type call_(Matcher2 const &m, Visitor &visitor, mpl::false_)
Chris@16:         {
Chris@16:             string_type str = string_cast<string_type>(m, visitor.traits());
Chris@16:             return type(str, visitor.traits());
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16:     template<typename BidiIter, typename ICase, typename Traits, typename Matcher>
Chris@16:     struct default_transmogrify<BidiIter, ICase, Traits, Matcher, typename Matcher::is_boost_xpressive_xpression_>
Chris@16:     {
Chris@16:         typedef Matcher type;
Chris@16: 
Chris@16:         template<typename Matcher2>
Chris@16:         static Matcher2 const &call(Matcher2 const &m, dont_care)
Chris@16:         {
Chris@16:             return m;
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16:     template<typename BidiIter, typename ICase, typename Traits, typename Matcher>
Chris@16:     struct transmogrify
Chris@16:       : default_transmogrify<BidiIter, ICase, Traits, Matcher>
Chris@16:     {};
Chris@16: 
Chris@16:     template<typename BidiIter, typename ICase, typename Traits>
Chris@16:     struct transmogrify<BidiIter, ICase, Traits, assert_bol_placeholder >
Chris@16:     {
Chris@16:         typedef assert_bol_matcher<Traits> type;
Chris@16: 
Chris@16:         template<typename Matcher2, typename Visitor>
Chris@16:         static type call(Matcher2, Visitor &visitor)
Chris@16:         {
Chris@16:             return type(visitor.traits());
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16:     template<typename BidiIter, typename ICase, typename Traits>
Chris@16:     struct transmogrify<BidiIter, ICase, Traits, assert_eol_placeholder >
Chris@16:     {
Chris@16:         typedef assert_eol_matcher<Traits> type;
Chris@16: 
Chris@16:         template<typename Matcher2, typename Visitor>
Chris@16:         static type call(Matcher2, Visitor &visitor)
Chris@16:         {
Chris@16:             return type(visitor.traits());
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16:     template<typename BidiIter, typename ICase, typename Traits>
Chris@16:     struct transmogrify<BidiIter, ICase, Traits, logical_newline_placeholder >
Chris@16:     {
Chris@16:         typedef logical_newline_matcher<Traits> type;
Chris@16: 
Chris@16:         template<typename Matcher2, typename Visitor>
Chris@16:         static type call(Matcher2, Visitor &visitor)
Chris@16:         {
Chris@16:             return type(visitor.traits());
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16:     template<typename BidiIter, typename ICase, typename Traits, typename Char>
Chris@16:     struct transmogrify<BidiIter, ICase, Traits, range_placeholder<Char> >
Chris@16:     {
Chris@16:         // By design, we don't widen character ranges.
Chris@16:         typedef typename iterator_value<BidiIter>::type char_type;
Chris@16:         BOOST_MPL_ASSERT((is_same<Char, char_type>));
Chris@16:         typedef range_matcher<Traits, ICase> type;
Chris@16: 
Chris@16:         template<typename Matcher2, typename Visitor>
Chris@16:         static type call(Matcher2 const &m, Visitor &visitor)
Chris@16:         {
Chris@16:             return type(m.ch_min_, m.ch_max_, m.not_, visitor.traits());
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16:     template<typename BidiIter, typename ICase, typename Traits>
Chris@16:     struct transmogrify<BidiIter, ICase, Traits, mark_placeholder >
Chris@16:     {
Chris@16:         typedef mark_matcher<Traits, ICase> type;
Chris@16: 
Chris@16:         template<typename Matcher2, typename Visitor>
Chris@16:         static type call(Matcher2 const &m, Visitor &visitor)
Chris@16:         {
Chris@16:             return type(m.mark_number_, visitor.traits());
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16:     template<typename BidiIter, typename ICase, typename Traits>
Chris@16:     struct transmogrify<BidiIter, ICase, Traits, posix_charset_placeholder >
Chris@16:     {
Chris@16:         typedef posix_charset_matcher<Traits> type;
Chris@16: 
Chris@16:         template<typename Matcher2, typename Visitor>
Chris@16:         static type call(Matcher2 const &m, Visitor &visitor)
Chris@16:         {
Chris@16:             char const *name_end = m.name_ + std::strlen(m.name_);
Chris@16:             return type(visitor.traits().lookup_classname(m.name_, name_end, ICase::value), m.not_);
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16:     template<typename BidiIter, typename Traits, typename Size>
Chris@16:     struct transmogrify<BidiIter, mpl::true_, Traits, set_matcher<Traits, Size> >
Chris@16:     {
Chris@16:         typedef set_matcher<Traits, Size> type;
Chris@16: 
Chris@16:         template<typename Matcher2, typename Visitor>
Chris@16:         static type call(Matcher2 m, Visitor &visitor)
Chris@16:         {
Chris@16:             m.nocase(visitor.traits());
Chris@16:             return m;
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16:     template<typename BidiIter, typename ICase, typename Traits, typename Cond>
Chris@16:     struct transmogrify<BidiIter, ICase, Traits, assert_word_placeholder<Cond> >
Chris@16:     {
Chris@16:         typedef assert_word_matcher<Cond, Traits> type;
Chris@16: 
Chris@16:         template<typename Visitor>
Chris@16:         static type call(dont_care, Visitor &visitor)
Chris@16:         {
Chris@16:             return type(visitor.traits());
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16:     template<typename BidiIter, typename ICase, typename Traits>
Chris@16:     struct transmogrify<BidiIter, ICase, Traits, reference_wrapper<basic_regex<BidiIter> > >
Chris@16:     {
Chris@16:         typedef regex_byref_matcher<BidiIter> type;
Chris@16: 
Chris@16:         template<typename Matcher2>
Chris@16:         static type call(Matcher2 const &m, dont_care)
Chris@16:         {
Chris@16:             return type(detail::core_access<BidiIter>::get_regex_impl(m.get()));
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16:     template<typename BidiIter, typename ICase, typename Traits>
Chris@16:     struct transmogrify<BidiIter, ICase, Traits, reference_wrapper<basic_regex<BidiIter> const> >
Chris@16:     {
Chris@16:         typedef regex_byref_matcher<BidiIter> type;
Chris@16: 
Chris@16:         template<typename Matcher2>
Chris@16:         static type call(Matcher2 const &m, dont_care)
Chris@16:         {
Chris@16:             return type(detail::core_access<BidiIter>::get_regex_impl(m.get()));
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16:     template<typename BidiIter, typename ICase, typename Traits>
Chris@16:     struct transmogrify<BidiIter, ICase, Traits, tracking_ptr<regex_impl<BidiIter> > >
Chris@16:     {
Chris@16:         typedef regex_matcher<BidiIter> type;
Chris@16: 
Chris@16:         template<typename Matcher2>
Chris@16:         static type call(Matcher2 const &m, dont_care)
Chris@16:         {
Chris@16:             return type(m.get());
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16:     template<typename BidiIter, typename ICase, typename Traits>
Chris@16:     struct transmogrify<BidiIter, ICase, Traits, self_placeholder >
Chris@16:     {
Chris@16:         typedef regex_byref_matcher<BidiIter> type;
Chris@16: 
Chris@16:         template<typename Matcher2, typename Visitor>
Chris@16:         static type call(Matcher2, Visitor &visitor)
Chris@16:         {
Chris@16:             return type(visitor.self());
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16: }}}
Chris@16: 
Chris@16: #endif