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 #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 #include <iterator> // for std::iterator_traits
  30
  31 namespace boost { namespace spirit
  32 {
  33     ///////////////////////////////////////////////////////////////////////////
  34     // Enablers
  35     ///////////////////////////////////////////////////////////////////////////
  36
  37     // enables tokenid_mask(id)
  38     template <typename A0>
  39     struct use_terminal<qi::domain
  40       , terminal_ex<tag::tokenid_mask, fusion::vector1<A0> >
  41     > : mpl::or_<is_integral<A0>, is_enum<A0> > {};
  42
  43     // enables *lazy* tokenid_mask(id)
  44     template <>
  45     struct use_lazy_terminal<
  46         qi::domain, tag::tokenid_mask, 1
  47     > : mpl::true_ {};
  48 }}
  49
  50 namespace boost { namespace spirit { namespace qi
  51 {
  52 #ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
  53     using spirit::tokenid_mask;
  54 #endif
  55     using spirit::tokenid_mask_type;
  56
  57     ///////////////////////////////////////////////////////////////////////////
  58     // The plain_tokenid represents a simple token defined by the lexer inside
  59     // a Qi grammar. The difference to plain_token is that it exposes the
  60     // matched token id instead of the iterator_range of the matched input.
  61     // Additionally it applies the given mask to the matched token id.
  62     template <typename Mask>
  63     struct plain_tokenid_mask
  64       : primitive_parser<plain_tokenid_mask<Mask> >
  65     {
  66         template <typename Context, typename Iterator>
  67         struct attribute
  68         {
  69             typedef Mask type;
  70         };
  71
  72         plain_tokenid_mask(Mask const& mask)
  73           : mask(mask) {}
  74
  75         template <typename Iterator, typename Context
  76           , typename Skipper, typename Attribute>
  77         bool parse(Iterator& first, Iterator const& last
  78           , Context& /*context*/, Skipper const& skipper
  79           , Attribute& attr) const
  80         {
  81             qi::skip_over(first, last, skipper);   // always do a pre-skip
  82
  83             if (first != last) {
  84                 // simply match the token id with the mask this component has
  85                 // been initialized with
  86
  87                 typedef typename
  88                     std::iterator_traits<Iterator>::value_type
  89                 token_type;
  90                 typedef typename token_type::id_type id_type;
  91
  92                 token_type const& t = *first;
  93                 if ((t.id() & mask) == id_type(mask))
  94                 {
  95                     spirit::traits::assign_to(t.id(), attr);
  96                     ++first;
  97                     return true;
  98                 }
  99             }
 100             return false;
 101         }
 102
 103         template <typename Context>
 104         info what(Context& /*context*/) const
 105         {
 106             return info("tokenid_mask",
 107                 "tokenid_mask(" + boost::lexical_cast<utf8_string>(mask) + ")");
 108         }
 109
 110         Mask mask;
 111     };
 112
 113     ///////////////////////////////////////////////////////////////////////////
 114     // Parser generators: make_xxx function (objects)
 115     ///////////////////////////////////////////////////////////////////////////
 116     template <typename Modifiers, typename Mask>
 117     struct make_primitive<terminal_ex<tag::tokenid_mask, fusion::vector1<Mask> >
 118       , Modifiers>
 119     {
 120         typedef plain_tokenid_mask<Mask> result_type;
 121
 122         template <typename Terminal>
 123         result_type operator()(Terminal const& term, unused_type) const
 124         {
 125             return result_type(fusion::at_c<0>(term.args));
 126         }
 127     };
 128 }}}
 129
 130 namespace boost { namespace spirit { namespace traits
 131 {
 132     ///////////////////////////////////////////////////////////////////////////
 133     template<typename Mask, typename Attr, typename Context, typename Iterator>
 134     struct handles_container<qi::plain_tokenid_mask<Mask>, Attr, Context, Iterator>
 135       : mpl::true_
 136     {};
 137 }}}
 138
 139 #endif