ceph/src/boost/boost/spirit/home/qi/stream/stream.hpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2011 Hartmut Kaiser
   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_STREAM_MAY_05_2007_1228PM)
   8 #define BOOST_SPIRIT_STREAM_MAY_05_2007_1228PM
   9
  10 #if defined(_MSC_VER)
  11 #pragma once
  12 #endif
  13
  14 #include <boost/spirit/home/qi/detail/string_parse.hpp>
  15 #include <boost/spirit/home/qi/stream/detail/match_manip.hpp>
  16 #include <boost/spirit/home/qi/stream/detail/iterator_source.hpp>
  17 #include <boost/spirit/home/support/detail/hold_any.hpp>
  18 #include <boost/proto/traits.hpp>
  19 #include <iosfwd>
  20 #include <sstream>
  21
  22 ///////////////////////////////////////////////////////////////////////////////
  23 namespace boost { namespace spirit
  24 {
  25     ///////////////////////////////////////////////////////////////////////////
  26     // Enablers
  27     ///////////////////////////////////////////////////////////////////////////
  28     template <>
  29     struct use_terminal<qi::domain, tag::stream> // enables stream
  30       : mpl::true_ {};
  31
  32     template <>
  33     struct use_terminal<qi::domain, tag::wstream> // enables wstream
  34       : mpl::true_ {};
  35 }}
  36
  37 ///////////////////////////////////////////////////////////////////////////////
  38 namespace boost { namespace spirit { namespace qi
  39 {
  40 #ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
  41     using spirit::stream;
  42     using spirit::wstream;
  43 #endif
  44     using spirit::stream_type;
  45     using spirit::wstream_type;
  46
  47     template <typename Char = char, typename T = spirit::basic_hold_any<char> >
  48     struct stream_parser
  49       : primitive_parser<stream_parser<Char, T> >
  50     {
  51         template <typename Context, typename Iterator>
  52         struct attribute
  53         {
  54             typedef T type;
  55         };
  56
  57         template <typename Iterator, typename Context
  58           , typename Skipper, typename Attribute>
  59         bool parse(Iterator& first, Iterator const& last
  60           , Context& /*context*/, Skipper const& skipper
  61           , Attribute& attr_) const
  62         {
  63             typedef qi::detail::iterator_source<Iterator> source_device;
  64             typedef boost::iostreams::stream<source_device> instream;
  65
  66             qi::skip_over(first, last, skipper);
  67
  68             instream in(first, last);           // copies 'first'
  69             in >> attr_;                        // use existing operator>>()
  70
  71             // advance the iterator if everything is ok
  72             if (in) {
  73                 if (!in.eof()) {
  74                     typedef typename
  75                         boost::iterator_difference<Iterator>::type diff_type;
  76
  77                     diff_type pos = static_cast<diff_type>(in.tellg());
  78                     std::advance(first, pos);
  79                 } else {
  80                     first = last;
  81                 }
  82                 return true;
  83             }
  84
  85             return false;
  86         }
  87
  88         template <typename Context>
  89         info what(Context& /*context*/) const
  90         {
  91             return info("stream");
  92         }
  93     };
  94
  95     template <typename T, typename Char = char>
  96     struct typed_stream
  97       : proto::terminal<stream_parser<Char, T> >::type
  98     {
  99     };
 100
 101     ///////////////////////////////////////////////////////////////////////////
 102     // Parser generators: make_xxx function (objects)
 103     ///////////////////////////////////////////////////////////////////////////
 104     template <typename Char>
 105     struct make_stream
 106     {
 107         typedef stream_parser<Char> result_type;
 108         result_type operator()(unused_type, unused_type) const
 109         {
 110             return result_type();
 111         }
 112     };
 113
 114     template <typename Modifiers>
 115     struct make_primitive<tag::stream, Modifiers> : make_stream<char> {};
 116
 117     template <typename Modifiers>
 118     struct make_primitive<tag::wstream, Modifiers> : make_stream<wchar_t> {};
 119 }}}
 120
 121 #endif