ceph/src/boost/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
  23 #include <boost/fusion/include/vector.hpp>
  24 #include <boost/fusion/include/at.hpp>
  25 #include <boost/mpl/or.hpp>
  26 #include <boost/range/iterator_range_core.hpp>
  27 #include <boost/type_traits/is_integral.hpp>
  28 #include <boost/type_traits/is_enum.hpp>
  29 #include <iterator> // for std::iterator_traits
  30 #include <sstream>
  31
  32 namespace boost { namespace spirit
  33 {
  34     ///////////////////////////////////////////////////////////////////////////
  35     // Enablers
  36     ///////////////////////////////////////////////////////////////////////////
  37
  38     // enables tokenid_mask(id)
  39     template <typename A0>
  40     struct use_terminal<qi::domain
  41       , terminal_ex<tag::tokenid_mask, fusion::vector1<A0> >
  42     > : mpl::or_<is_integral<A0>, is_enum<A0> > {};
  43
  44     // enables *lazy* tokenid_mask(id)
  45     template <>
  46     struct use_lazy_terminal<
  47         qi::domain, tag::tokenid_mask, 1
  48     > : mpl::true_ {};
  49 }}
  50
  51 namespace boost { namespace spirit { namespace qi
  52 {
  53 #ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
  54     using spirit::tokenid_mask;
  55 #endif
  56     using spirit::tokenid_mask_type;
  57
  58     ///////////////////////////////////////////////////////////////////////////
  59     // The plain_tokenid represents a simple token defined by the lexer inside
  60     // a Qi grammar. The difference to plain_token is that it exposes the
  61     // matched token id instead of the iterator_range of the matched input.
  62     // Additionally it applies the given mask to the matched token id.
  63     template <typename Mask>
  64     struct plain_tokenid_mask
  65       : primitive_parser<plain_tokenid_mask<Mask> >
  66     {
  67         template <typename Context, typename Iterator>
  68         struct attribute
  69         {
  70             typedef Mask type;
  71         };
  72
  73         plain_tokenid_mask(Mask const& mask)
  74           : mask(mask) {}
  75
  76         template <typename Iterator, typename Context
  77           , typename Skipper, typename Attribute>
  78         bool parse(Iterator& first, Iterator const& last
  79           , Context& /*context*/, Skipper const& skipper
  80           , Attribute& attr) const
  81         {
  82             qi::skip_over(first, last, skipper);   // always do a pre-skip
  83
  84             if (first != last) {
  85                 // simply match the token id with the mask this component has
  86                 // been initialized with
  87
  88                 typedef typename
  89                     std::iterator_traits<Iterator>::value_type
  90                 token_type;
  91                 typedef typename token_type::id_type id_type;
  92
  93                 token_type const& t = *first;
  94                 if ((t.id() & mask) == id_type(mask))
  95                 {
  96                     spirit::traits::assign_to(t.id(), attr);
  97                     ++first;
  98                     return true;
  99                 }
 100             }
 101             return false;
 102         }
 103
 104         template <typename Context>
 105         info what(Context& /*context*/) const
 106         {
 107             std::stringstream ss;
 108             ss << "tokenid_mask(" << mask << ")";
 109             return info("tokenid_mask", ss.str());
 110         }
 111
 112         Mask mask;
 113     };
 114
 115     ///////////////////////////////////////////////////////////////////////////
 116     // Parser generators: make_xxx function (objects)
 117     ///////////////////////////////////////////////////////////////////////////
 118     template <typename Modifiers, typename Mask>
 119     struct make_primitive<terminal_ex<tag::tokenid_mask, fusion::vector1<Mask> >
 120       , Modifiers>
 121     {
 122         typedef plain_tokenid_mask<Mask> result_type;
 123
 124         template <typename Terminal>
 125         result_type operator()(Terminal const& term, unused_type) const
 126         {
 127             return result_type(fusion::at_c<0>(term.args));
 128         }
 129     };
 130 }}}
 131
 132 namespace boost { namespace spirit { namespace traits
 133 {
 134     ///////////////////////////////////////////////////////////////////////////
 135     template<typename Mask, typename Attr, typename Context, typename Iterator>
 136     struct handles_container<qi::plain_tokenid_mask<Mask>, Attr, Context, Iterator>
 137       : mpl::true_
 138     {};
 139 }}}
 140
 141 #endif