ceph/src/boost/boost/spirit/home/lex/qi/plain_tokenid.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_NOV_26_2010_0944AM)
   7 #define BOOST_SPIRIT_LEX_PLAIN_TOKENID_NOV_26_2010_0944AM
   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/mpl/and.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
  39     template <>
  40     struct use_terminal<qi::domain, tag::tokenid>
  41       : mpl::true_ {};
  42
  43     // enables tokenid(id)
  44     template <typename A0>
  45     struct use_terminal<qi::domain
  46       , terminal_ex<tag::tokenid, fusion::vector1<A0> >
  47     > : mpl::or_<is_integral<A0>, is_enum<A0> > {};
  48
  49     // enables tokenid(idmin, idmax)
  50     template <typename A0, typename A1>
  51     struct use_terminal<qi::domain
  52       , terminal_ex<tag::tokenid, fusion::vector2<A0, A1> >
  53     > : mpl::and_<
  54             mpl::or_<is_integral<A0>, is_enum<A0> >
  55           , mpl::or_<is_integral<A1>, is_enum<A1> >
  56         > {};
  57
  58     // enables *lazy* tokenid(id)
  59     template <>
  60     struct use_lazy_terminal<
  61         qi::domain, tag::tokenid, 1
  62     > : mpl::true_ {};
  63
  64     // enables *lazy* tokenid(idmin, idmax)
  65     template <>
  66     struct use_lazy_terminal<
  67         qi::domain, tag::tokenid, 2
  68     > : mpl::true_ {};
  69 }}
  70
  71 namespace boost { namespace spirit { namespace qi
  72 {
  73 #ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
  74     using spirit::tokenid;
  75 #endif
  76     using spirit::tokenid_type;
  77
  78     ///////////////////////////////////////////////////////////////////////////
  79     // The plain_tokenid represents a simple token defined by the lexer inside
  80     // a Qi grammar. The difference to plain_token is that it exposes the
  81     // matched token id instead of the iterator_range of the matched input.
  82     template <typename TokenId>
  83     struct plain_tokenid
  84       : primitive_parser<plain_tokenid<TokenId> >
  85     {
  86         template <typename Context, typename Iterator>
  87         struct attribute
  88         {
  89             typedef TokenId type;
  90         };
  91
  92         plain_tokenid(TokenId const& id)
  93           : id(id) {}
  94
  95         template <typename Iterator, typename Context
  96           , typename Skipper, typename Attribute>
  97         bool parse(Iterator& first, Iterator const& last
  98           , Context& /*context*/, Skipper const& skipper
  99           , Attribute& attr) const
 100         {
 101             qi::skip_over(first, last, skipper);   // always do a pre-skip
 102
 103             if (first != last) {
 104                 // simply match the token id with the id this component has
 105                 // been initialized with
 106
 107                 typedef typename
 108                     std::iterator_traits<Iterator>::value_type
 109                 token_type;
 110                 typedef typename token_type::id_type id_type;
 111
 112                 token_type const& t = *first;
 113                 if (id_type(~0) == id_type(id) || id_type(id) == t.id()) {
 114                     spirit::traits::assign_to(id, attr);
 115                     ++first;
 116                     return true;
 117                 }
 118             }
 119             return false;
 120         }
 121
 122         template <typename Context>
 123         info what(Context& /*context*/) const
 124         {
 125             std::stringstream ss;
 126             ss << "tokenid(" << id << ")";
 127             return info("tokenid", ss.str());
 128         }
 129
 130         TokenId id;
 131     };
 132
 133     ///////////////////////////////////////////////////////////////////////////
 134     template <typename TokenId>
 135     struct plain_tokenid_range
 136       : primitive_parser<plain_tokenid_range<TokenId> >
 137     {
 138         template <typename Context, typename Iterator>
 139         struct attribute
 140         {
 141             typedef TokenId type;
 142         };
 143
 144         plain_tokenid_range(TokenId const& idmin, TokenId const& idmax)
 145           : idmin(idmin), idmax(idmax) {}
 146
 147         template <typename Iterator, typename Context
 148           , typename Skipper, typename Attribute>
 149         bool parse(Iterator& first, Iterator const& last
 150           , Context& /*context*/, Skipper const& skipper
 151           , Attribute& attr) const
 152         {
 153             qi::skip_over(first, last, skipper);   // always do a pre-skip
 154
 155             if (first != last) {
 156                 // simply match the token id with the id this component has
 157                 // been initialized with
 158
 159                 typedef typename
 160                     std::iterator_traits<Iterator>::value_type
 161                 token_type;
 162                 typedef typename token_type::id_type id_type;
 163
 164                 token_type const& t = *first;
 165                 if (id_type(idmin) >= t.id() && id_type(idmin) <= t.id())
 166                 {
 167                     spirit::traits::assign_to(t.id(), attr);
 168                     ++first;
 169                     return true;
 170                 }
 171             }
 172             return false;
 173         }
 174
 175         template <typename Context>
 176         info what(Context& /*context*/) const
 177         {
 178             std::stringstream ss;
 179             ss << "token(" << idmin << ", " << idmax << ")";
 180             return info("tokenid_range", ss.str());
 181         }
 182
 183         TokenId idmin, idmax;
 184     };
 185
 186     ///////////////////////////////////////////////////////////////////////////
 187     // Parser generators: make_xxx function (objects)
 188     ///////////////////////////////////////////////////////////////////////////
 189     template <typename Modifiers>
 190     struct make_primitive<tag::tokenid, Modifiers>
 191     {
 192         typedef plain_tokenid<std::size_t> result_type;
 193
 194         result_type operator()(unused_type, unused_type) const
 195         {
 196             return result_type(std::size_t(~0));
 197         }
 198     };
 199
 200     template <typename Modifiers, typename TokenId>
 201     struct make_primitive<terminal_ex<tag::tokenid, fusion::vector1<TokenId> >
 202       , Modifiers>
 203     {
 204         typedef plain_tokenid<TokenId> result_type;
 205
 206         template <typename Terminal>
 207         result_type operator()(Terminal const& term, unused_type) const
 208         {
 209             return result_type(fusion::at_c<0>(term.args));
 210         }
 211     };
 212
 213     template <typename Modifiers, typename TokenId>
 214     struct make_primitive<terminal_ex<tag::tokenid, fusion::vector2<TokenId, TokenId> >
 215       , Modifiers>
 216     {
 217         typedef plain_tokenid_range<TokenId> result_type;
 218
 219         template <typename Terminal>
 220         result_type operator()(Terminal const& term, unused_type) const
 221         {
 222             return result_type(fusion::at_c<0>(term.args)
 223               , fusion::at_c<1>(term.args));
 224         }
 225     };
 226 }}}
 227
 228 namespace boost { namespace spirit { namespace traits
 229 {
 230     ///////////////////////////////////////////////////////////////////////////
 231     template<typename Idtype, typename Attr, typename Context, typename Iterator>
 232     struct handles_container<qi::plain_tokenid<Idtype>, Attr, Context, Iterator>
 233       : mpl::true_
 234     {};
 235
 236     template<typename Idtype, typename Attr, typename Context, typename Iterator>
 237     struct handles_container<qi::plain_tokenid_range<Idtype>, Attr, Context, Iterator>
 238       : mpl::true_
 239     {};
 240 }}}
 241
 242 #endif