ceph/src/boost/boost/spirit/home/qi/nonterminal/success_handler.hpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2011 Joel de Guzman
   3
   4     Distributed under the Boost Software License, Version 1.0. (See accompanying
   5     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 ==============================================================================*/
   7 #if !defined(BOOST_SPIRIT_SUCCESS_HANDLER_FEBRUARY_25_2011_1051AM)
   8 #define BOOST_SPIRIT_SUCCESS_HANDLER_FEBRUARY_25_2011_1051AM
   9
  10 #if defined(_MSC_VER)
  11 #pragma once
  12 #endif
  13
  14 #include <boost/spirit/home/qi/nonterminal/rule.hpp>
  15 #include <boost/function.hpp>
  16
  17 namespace boost { namespace spirit { namespace qi
  18 {
  19     template <
  20         typename Iterator, typename Context
  21       , typename Skipper, typename F
  22     >
  23     struct success_handler
  24     {
  25         typedef function<
  26             bool(Iterator& first, Iterator const& last
  27               , Context& context
  28               , Skipper const& skipper
  29             )>
  30         function_type;
  31
  32         success_handler(function_type subject_, F f_)
  33           : subject(subject_)
  34           , f(f_)
  35         {
  36         }
  37
  38         bool operator()(
  39             Iterator& first, Iterator const& last
  40           , Context& context, Skipper const& skipper) const
  41         {
  42             Iterator i = first;
  43             bool r = subject(i, last, context, skipper);
  44             if (r)
  45             {
  46                 typedef
  47                     fusion::vector<
  48                         Iterator&
  49                       , Iterator const&
  50                       , Iterator const&>
  51                 params;
  52                 skip_over(first, last, skipper);
  53                 params args(first, last, i);
  54                 f(args, context);
  55
  56                 first = i;
  57             }
  58             return r;
  59         }
  60
  61         function_type subject;
  62         F f;
  63     };
  64
  65     template <
  66         typename Iterator, typename T0, typename T1, typename T2
  67       , typename F>
  68     void on_success(rule<Iterator, T0, T1, T2>& r, F f)
  69     {
  70         typedef rule<Iterator, T0, T1, T2> rule_type;
  71
  72         typedef
  73             success_handler<
  74                 Iterator
  75               , typename rule_type::context_type
  76               , typename rule_type::skipper_type
  77               , F>
  78         success_handler;
  79         r.f = success_handler(r.f, f);
  80     }
  81 }}}
  82
  83 #endif