ceph/src/boost/libs/spirit/include/boost/spirit/repository/home/qi/primitive/iter_pos.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_REPOSITORY_QI_ITER_POS_NOV_20_2009_1245PM)
   7 #define BOOST_SPIRIT_REPOSITORY_QI_ITER_POS_NOV_20_2009_1245PM
   8
   9 #include <boost/spirit/include/qi_parse.hpp>
  10
  11 ///////////////////////////////////////////////////////////////////////////////
  12 // definition the place holder
  13 namespace boost { namespace spirit { namespace repository { namespace qi
  14 {
  15     BOOST_SPIRIT_TERMINAL(iter_pos);
  16 }}}}
  17
  18 ///////////////////////////////////////////////////////////////////////////////
  19 // implementation the enabler
  20 namespace boost { namespace spirit
  21 {
  22     // We want custom_parser::iter_pos to be usable as a terminal only,
  23     // and only for parser expressions (qi::domain).
  24     template <>
  25     struct use_terminal<qi::domain, repository::qi::tag::iter_pos>
  26       : mpl::true_
  27     {};
  28 }}
  29
  30 ///////////////////////////////////////////////////////////////////////////////
  31 // implementation of the parser
  32 namespace boost { namespace spirit { namespace repository { namespace qi
  33 {
  34     struct iter_pos_parser
  35       : boost::spirit::qi::primitive_parser<iter_pos_parser>
  36     {
  37         // Define the attribute type exposed by this parser component
  38         template <typename Context, typename Iterator>
  39         struct attribute
  40         {
  41             typedef Iterator type;
  42         };
  43
  44         // This function is called during the actual parsing process
  45         template <typename Iterator, typename Context
  46           , typename Skipper, typename Attribute>
  47         bool parse(Iterator& first, Iterator const& last
  48           , Context&, Skipper const& skipper, Attribute& attr) const
  49         {
  50             boost::spirit::qi::skip_over(first, last, skipper);
  51             boost::spirit::traits::assign_to(first, attr);
  52             return true;
  53         }
  54
  55         // This function is called during error handling to create
  56         // a human readable string for the error context.
  57         template <typename Context>
  58         boost::spirit::info what(Context&) const
  59         {
  60             return boost::spirit::info("iter_pos");
  61         }
  62     };
  63 }}}}
  64
  65 ///////////////////////////////////////////////////////////////////////////////
  66 // instantiation of the parser
  67 namespace boost { namespace spirit { namespace qi
  68 {
  69     // This is the factory function object invoked in order to create
  70     // an instance of our iter_pos_parser.
  71     template <typename Modifiers>
  72     struct make_primitive<repository::qi::tag::iter_pos, Modifiers>
  73     {
  74         typedef repository::qi::iter_pos_parser result_type;
  75
  76         result_type operator()(unused_type, unused_type) const
  77         {
  78             return result_type();
  79         }
  80     };
  81 }}}
  82
  83 #endif