ceph/src/boost/boost/spirit/home/karma/nonterminal/simple_trace.hpp

   1 //  Copyright (c) 2001-2011 Hartmut Kaiser
   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_KARMA_SIMPLE_TRACE_APR_21_2010_0155PM)
   8 #define BOOST_SPIRIT_KARMA_SIMPLE_TRACE_APR_21_2010_0155PM
   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/karma/nonterminal/debug_handler_state.hpp>
  16 #include <boost/fusion/include/out.hpp>
  17 #include <iostream>
  18
  19 //  The stream to use for debug output
  20 #if !defined(BOOST_SPIRIT_DEBUG_OUT)
  21 #define BOOST_SPIRIT_DEBUG_OUT std::cerr
  22 #endif
  23
  24 //  number of tokens to print while debugging
  25 #if !defined(BOOST_SPIRIT_DEBUG_PRINT_SOME)
  26 #define BOOST_SPIRIT_DEBUG_PRINT_SOME 20
  27 #endif
  28
  29 //  number of spaces to indent
  30 #if !defined(BOOST_SPIRIT_DEBUG_INDENT)
  31 #define BOOST_SPIRIT_DEBUG_INDENT 2
  32 #endif
  33
  34 namespace boost { namespace spirit { namespace karma
  35 {
  36     struct simple_trace
  37     {
  38         int& get_indent() const
  39         {
  40             static int indent = 0;
  41             return indent;
  42         }
  43
  44         void print_indent() const
  45         {
  46             int n = get_indent();
  47             n *= BOOST_SPIRIT_DEBUG_INDENT;
  48             for (int i = 0; i != n; ++i)
  49                 BOOST_SPIRIT_DEBUG_OUT << ' ';
  50         }
  51
  52         template <typename Buffer>
  53         void print_some(char const* tag, Buffer const& buffer) const
  54         {
  55             print_indent();
  56             BOOST_SPIRIT_DEBUG_OUT << '<' << tag << '>' << std::flush;
  57             {
  58                 std::ostreambuf_iterator<char> out(BOOST_SPIRIT_DEBUG_OUT);
  59                 buffer.buffer_copy_to(out, BOOST_SPIRIT_DEBUG_PRINT_SOME);
  60             }
  61             BOOST_SPIRIT_DEBUG_OUT << "</" << tag << '>' << std::endl;
  62         }
  63
  64         template <typename OutputIterator, typename Context, typename State
  65           , typename Buffer>
  66         void operator()(
  67             OutputIterator&, Context const& context
  68           , State state, std::string const& rule_name
  69           , Buffer const& buffer) const
  70         {
  71             switch (state)
  72             {
  73                 case pre_generate:
  74                     print_indent();
  75                     ++get_indent();
  76                     BOOST_SPIRIT_DEBUG_OUT
  77                         << '<' << rule_name << '>' << std::endl;
  78                     print_indent();
  79                     ++get_indent();
  80                     BOOST_SPIRIT_DEBUG_OUT << "<try>" << std::endl;;
  81                     print_indent();
  82                     BOOST_SPIRIT_DEBUG_OUT << "<attributes>";
  83                     traits::print_attribute(
  84                         BOOST_SPIRIT_DEBUG_OUT,
  85                         context.attributes
  86                     );
  87                     BOOST_SPIRIT_DEBUG_OUT << "</attributes>" << std::endl;
  88                     if (!fusion::empty(context.locals))
  89                     {
  90                         print_indent();
  91                         BOOST_SPIRIT_DEBUG_OUT
  92                             << "<locals>" << context.locals << "</locals>"
  93                             << std::endl;
  94                     }
  95                     --get_indent();
  96                     print_indent();
  97                     BOOST_SPIRIT_DEBUG_OUT << "</try>" << std::endl;;
  98                     break;
  99
 100                 case successful_generate:
 101                     print_indent();
 102                     ++get_indent();
 103                     BOOST_SPIRIT_DEBUG_OUT << "<success>" << std::endl;
 104                     print_some("result", buffer);
 105                     if (!fusion::empty(context.locals))
 106                     {
 107                         print_indent();
 108                         BOOST_SPIRIT_DEBUG_OUT
 109                             << "<locals>" << context.locals << "</locals>"
 110                             << std::endl;
 111                     }
 112                     --get_indent();
 113                     print_indent();
 114                     BOOST_SPIRIT_DEBUG_OUT << "</success>" << std::endl;
 115                     --get_indent();
 116                     print_indent();
 117                     BOOST_SPIRIT_DEBUG_OUT
 118                         << "</" << rule_name << '>' << std::endl;
 119                     break;
 120
 121                 case failed_generate:
 122                     print_indent();
 123                     BOOST_SPIRIT_DEBUG_OUT << "<fail/>" << std::endl;
 124                     --get_indent();
 125                     print_indent();
 126                     BOOST_SPIRIT_DEBUG_OUT
 127                         << "</" << rule_name << '>' << std::endl;
 128                     break;
 129             }
 130         }
 131     };
 132 }}}
 133
 134 #endif