ceph/src/boost/boost/spirit/home/qi/detail/expect_function.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(SPIRIT_EXPECT_FUNCTION_APR_29_2007_0558PM)
   8 #define SPIRIT_EXPECT_FUNCTION_APR_29_2007_0558PM
   9
  10 #if defined(_MSC_VER)
  11 #pragma once
  12 #endif
  13
  14 #include <boost/spirit/home/support/unused.hpp>
  15 #include <boost/spirit/home/support/multi_pass_wrapper.hpp>
  16 #include <boost/throw_exception.hpp>
  17
  18 namespace boost { namespace spirit { namespace qi { namespace detail
  19 {
  20     template <
  21         typename Iterator, typename Context
  22       , typename Skipper, typename Exception>
  23     struct expect_function
  24     {
  25         typedef Iterator iterator_type;
  26         typedef Context context_type;
  27
  28         expect_function(
  29             Iterator& first_, Iterator const& last_
  30           , Context& context_, Skipper const& skipper_)
  31           : first(first_)
  32           , last(last_)
  33           , context(context_)
  34           , skipper(skipper_)
  35           , is_first(true)
  36         {
  37         }
  38
  39         template <typename Component, typename Attribute>
  40         bool operator()(Component const& component, Attribute& attr) const
  41         {
  42             // if this is not the first component in the expect chain we
  43             // need to flush any multi_pass iterator we might be acting on
  44             if (!is_first)
  45                 spirit::traits::clear_queue(first);
  46
  47             // if we are testing the first component in the sequence,
  48             // return true if the parser fails, if this is not the first
  49             // component, throw exception if the parser fails
  50             if (!component.parse(first, last, context, skipper, attr))
  51             {
  52                 if (is_first)
  53                 {
  54                     is_first = false;
  55                     return true;        // true means the match failed
  56                 }
  57                 boost::throw_exception(Exception(first, last, component.what(context)));
  58 #if defined(BOOST_NO_EXCEPTIONS)
  59                 return true;            // for systems not supporting exceptions
  60 #endif
  61             }
  62             is_first = false;
  63             return false;
  64         }
  65
  66         template <typename Component>
  67         bool operator()(Component const& component) const
  68         {
  69             // if this is not the first component in the expect chain we
  70             // need to flush any multi_pass iterator we might be acting on
  71             if (!is_first)
  72                 spirit::traits::clear_queue(first);
  73
  74             // if we are testing the first component in the sequence,
  75             // return true if the parser fails, if this not the first
  76             // component, throw exception if the parser fails
  77             if (!component.parse(first, last, context, skipper, unused))
  78             {
  79                 if (is_first)
  80                 {
  81                     is_first = false;
  82                     return true;
  83                 }
  84                 boost::throw_exception(Exception(first, last, component.what(context)));
  85 #if defined(BOOST_NO_EXCEPTIONS)
  86                 return false;   // for systems not supporting exceptions
  87 #endif
  88             }
  89             is_first = false;
  90             return false;
  91         }
  92
  93         Iterator& first;
  94         Iterator const& last;
  95         Context& context;
  96         Skipper const& skipper;
  97         mutable bool is_first;
  98
  99     private:
 100         // silence MSVC warning C4512: assignment operator could not be generated
 101         expect_function& operator= (expect_function const&);
 102     };
 103 }}}}
 104
 105 #endif