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
34namespace 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
135

source code of boost/libs/spirit/include/boost/spirit/home/karma/nonterminal/simple_trace.hpp