ceph/src/boost/libs/spirit/include/boost/spirit/home/lex/qi/plain_tokenid_mask.hpp

   1 //  Copyright (c) 2001-2011 Hartmut Kaiser
   2 //
   3 //  Distributed under the Boost Software License, Version 1.0. (See accompanying
   4 //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   5
   6 #if !defined(BOOST_SPIRIT_LEX_PLAIN_TOKENID_MASK_JUN_03_2011_0929PM)
   7 #define BOOST_SPIRIT_LEX_PLAIN_TOKENID_MASK_JUN_03_2011_0929PM
   8
   9 #if defined(_MSC_VER)
  10 #pragma once
  11 #endif
  12
  13 #include <boost/spirit/home/support/info.hpp>
  14 #include <boost/spirit/home/qi/detail/attributes.hpp>
  15 #include <boost/spirit/home/support/common_terminals.hpp>
  16 #include <boost/spirit/home/support/handles_container.hpp>
  17 #include <boost/spirit/home/qi/skip_over.hpp>
  18 #include <boost/spirit/home/qi/domain.hpp>
  19 #include <boost/spirit/home/qi/parser.hpp>
  20 #include <boost/spirit/home/qi/meta_compiler.hpp>
  21 #include <boost/spirit/home/qi/detail/assign_to.hpp>
  22 #include <boost/range/iterator_range.hpp>
  23 #include <boost/fusion/include/vector.hpp>
  24 #include <boost/fusion/include/at.hpp>
  25 #include <boost/mpl/or.hpp>
  26 #include <boost/type_traits/is_integral.hpp>
  27 #include <boost/type_traits/is_enum.hpp>
  28 #include <boost/lexical_cast.hpp>
  29
  30 namespace boost { namespace spirit
  31 {
  32     ///////////////////////////////////////////////////////////////////////////
  33     // Enablers
  34     ///////////////////////////////////////////////////////////////////////////
  35
  36     // enables tokenid_mask(id)
  37     template <typename A0>
  38     struct use_terminal<qi::domain
  39       , terminal_ex<tag::tokenid_mask, fusion::vector1<A0> >
  40     > : mpl::or_<is_integral<A0>, is_enum<A0> > {};
  41
  42     // enables *lazy* tokenid_mask(id)
  43     template <>
  44     struct use_lazy_terminal<
  45         qi::domain, tag::tokenid_mask, 1
  46     > : mpl::true_ {};
  47 }}
  48
  49 namespace boost { namespace spirit { namespace qi
  50 {
  51 #ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
  52     using spirit::tokenid_mask;
  53 #endif
  54     using spirit::tokenid_mask_type;
  55
  56     ///////////////////////////////////////////////////////////////////////////
  57     // The plain_tokenid represents a simple token defined by the lexer inside
  58     // a Qi grammar. The difference to plain_token is that it exposes the
  59     // matched token id instead of the iterator_range of the matched input.
  60     // Additionally it applies the given mask to the matched token id.
  61     template <typename Mask>
  62     struct plain_tokenid_mask
  63       : primitive_parser<plain_tokenid_mask<Mask> >
  64     {
  65         template <typename Context, typename Iterator>
  66         struct attribute
  67         {
  68             typedef Mask type;
  69         };
  70
  71         plain_tokenid_mask(Mask const& mask)
  72           : mask(mask) {}
  73
  74         template <typename Iterator, typename Context
  75           , typename Skipper, typename Attribute>
  76         bool parse(Iterator& first, Iterator const& last
  77           , Context& /*context*/, Skipper const& skipper
  78           , Attribute& attr) const
  79         {
  80             qi::skip_over(first, last, skipper);   // always do a pre-skip
  81
  82             if (first != last) {
  83                 // simply match the token id with the mask this component has
  84                 // been initialized with
  85
  86                 typedef typename
  87                     boost::detail::iterator_traits<Iterator>::value_type
  88                 token_type;
  89                 typedef typename token_type::id_type id_type;
  90
  91                 token_type const& t = *first;
  92                 if ((t.id() & mask) == id_type(mask))
  93                 {
  94                     spirit::traits::assign_to(t.id(), attr);
  95                     ++first;
  96                     return true;
  97                 }
  98             }
  99             return false;
 100         }
 101
 102         template <typename Context>
 103         info what(Context& /*context*/) const
 104         {
 105             return info("tokenid_mask",
 106                 "tokenid_mask(" + boost::lexical_cast<utf8_string>(mask) + ")");
 107         }
 108
 109         Mask mask;
 110     };
 111
 112     ///////////////////////////////////////////////////////////////////////////
 113     // Parser generators: make_xxx function (objects)
 114     ///////////////////////////////////////////////////////////////////////////
 115     template <typename Modifiers, typename Mask>
 116     struct make_primitive<terminal_ex<tag::tokenid_mask, fusion::vector1<Mask> >
 117       , Modifiers>
 118     {
 119         typedef plain_tokenid_mask<Mask> result_type;
 120
 121         template <typename Terminal>
 122         result_type operator()(Terminal const& term, unused_type) const
 123         {
 124             return result_type(fusion::at_c<0>(term.args));
 125         }
 126     };
 127 }}}
 128
 129 namespace boost { namespace spirit { namespace traits
 130 {
 131     ///////////////////////////////////////////////////////////////////////////
 132     template<typename Mask, typename Attr, typename Context, typename Iterator>
 133     struct handles_container<qi::plain_tokenid_mask<Mask>, Attr, Context, Iterator>
 134       : mpl::true_
 135     {};
 136 }}}
 137
 138 #endif