ceph/src/boost/libs/spirit/include/boost/spirit/home/qi/auxiliary/eol.hpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2011 Hartmut Kaiser
   3     Copyright (c) 2001-2011 Joel de Guzman
   4
   5     Distributed under the Boost Software License, Version 1.0. (See accompanying
   6     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   7 ==============================================================================*/
   8 #if !defined(BOOST_SPIRIT_EOL_APRIL_18_2008_0751PM)
   9 #define BOOST_SPIRIT_EOL_APRIL_18_2008_0751PM
  10
  11 #if defined(_MSC_VER)
  12 #pragma once
  13 #endif
  14
  15 #include <boost/mpl/bool.hpp>
  16 #include <boost/spirit/home/qi/domain.hpp>
  17 #include <boost/spirit/home/qi/parser.hpp>
  18 #include <boost/spirit/home/qi/meta_compiler.hpp>
  19 #include <boost/spirit/home/qi/skip_over.hpp>
  20 #include <boost/spirit/home/support/common_terminals.hpp>
  21
  22 namespace boost { namespace spirit
  23 {
  24     ///////////////////////////////////////////////////////////////////////////
  25     // Enablers
  26     ///////////////////////////////////////////////////////////////////////////
  27     template <>
  28     struct use_terminal<qi::domain, tag::eol>       // enables eol
  29       : mpl::true_ {};
  30 }}
  31
  32 namespace boost { namespace spirit { namespace qi
  33 {
  34 #ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
  35     using spirit::eol;
  36 #endif
  37     using spirit::eol_type;
  38
  39     struct eol_parser : primitive_parser<eol_parser>
  40     {
  41         template <typename Context, typename Iterator>
  42         struct attribute
  43         {
  44             typedef unused_type type;
  45         };
  46
  47         template <typename Iterator, typename Context
  48           , typename Skipper, typename Attribute>
  49         bool parse(Iterator& first, Iterator const& last
  50           , Context& /*context*/, Skipper const& skipper
  51           , Attribute& /*attr*/) const
  52         {
  53             qi::skip_over(first, last, skipper);
  54
  55             Iterator it = first;
  56             bool matched = false;
  57             if (it != last && *it == '\r')  // CR
  58             {
  59                 matched = true;
  60                 ++it;
  61             }
  62             if (it != last && *it == '\n')  // LF
  63             {
  64                 matched = true;
  65                 ++it;
  66             }
  67
  68             if (!matched)
  69                 return false;
  70
  71             first = it;
  72             return true;
  73         }
  74
  75         template <typename Context>
  76         info what(Context& /*context*/) const
  77         {
  78             return info("eol");
  79         }
  80     };
  81
  82     ///////////////////////////////////////////////////////////////////////////
  83     // Parser generators: make_xxx function (objects)
  84     ///////////////////////////////////////////////////////////////////////////
  85     template <typename Modifiers>
  86     struct make_primitive<tag::eol, Modifiers>
  87     {
  88         typedef eol_parser result_type;
  89         result_type operator()(unused_type, unused_type) const
  90         {
  91             return result_type();
  92         }
  93     };
  94 }}}
  95
  96 #endif
  97
  98