ceph/src/boost/libs/spirit/include/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
  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                     std::streamsize pos = in.tellg();
  75                     std::advance(first, pos);
  76                 } else {
  77                     first = last;
  78                 }
  79                 return true;
  80             }
  81
  82             return false;
  83         }
  84
  85         template <typename Context>
  86         info what(Context& /*context*/) const
  87         {
  88             return info("stream");
  89         }
  90     };
  91
  92     template <typename T, typename Char = char>
  93     struct typed_stream
  94       : proto::terminal<stream_parser<Char, T> >::type
  95     {
  96     };
  97
  98     ///////////////////////////////////////////////////////////////////////////
  99     // Parser generators: make_xxx function (objects)
 100     ///////////////////////////////////////////////////////////////////////////
 101     template <typename Char>
 102     struct make_stream
 103     {
 104         typedef stream_parser<Char> result_type;
 105         result_type operator()(unused_type, unused_type) const
 106         {
 107             return result_type();
 108         }
 109     };
 110
 111     template <typename Modifiers>
 112     struct make_primitive<tag::stream, Modifiers> : make_stream<char> {};
 113
 114     template <typename Modifiers>
 115     struct make_primitive<tag::wstream, Modifiers> : make_stream<wchar_t> {};
 116 }}}
 117
 118 #endif