1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
|
// file : backend-elements/indentation/clip.hxx
// author : Boris Kolpackov <boris@kolpackov.net>
// copyright : Copyright (c) 2005-2010 Boris Kolpackov
// license : GNU GPL v2 + exceptions; see accompanying LICENSE file
#ifndef BACKEND_ELEMENTS_INDENTATION_CLIP_HXX
#define BACKEND_ELEMENTS_INDENTATION_CLIP_HXX
#include <backend-elements/types.hxx>
#include <backend-elements/indentation/buffer.hxx>
#include <ostream>
namespace BackendElements
{
namespace Indentation
{
template <typename C>
class ToStreambufAdapter: public std::basic_streambuf<C>,
public NonCopyable
{
public:
typedef
typename std::basic_streambuf<C>::traits_type
Traits;
typedef
typename std::basic_streambuf<C>::char_type
AsChar;
typedef
typename std::basic_streambuf<C>::int_type
AsInt;
public:
ToStreambufAdapter (Buffer<C>& buffer)
: buffer_ (buffer)
{
}
virtual AsInt
overflow (AsInt ch)
{
return buffer_.put (Traits::to_char_type (ch));
}
virtual Int
sync ()
{
return 0;
}
private:
Buffer<C>& buffer_;
};
template <typename C>
class FromStreambufAdapter: public Buffer<C>
{
public:
typedef
typename Buffer<C>::Traits
Traits;
typedef
typename Buffer<C>::AsChar
AsChar;
typedef
typename Buffer<C>::AsInt
AsInt;
typedef
typename Buffer<C>::Write
Write;
public:
FromStreambufAdapter (std::basic_streambuf<C>& b)
: buffer_ (b)
{
}
virtual AsInt
put (AsChar ch)
{
return buffer_.sputc (ch);
}
virtual Void
unbuffer ()
{
try
{
if (buffer_.pubsync () == 0) return;
}
catch (std::ios_base::failure const&)
{
}
throw Write ();
}
private:
std::basic_streambuf<C>& buffer_;
};
template <template <typename> class Buffer, typename C = Char>
class Clip: public NonCopyable
{
public:
Clip (std::basic_ostream<C>& os)
: os_ (os),
prev_ (os_.rdbuf ()),
from_adapter_ (*prev_),
buffer_ (from_adapter_),
to_adapter_ (buffer_)
{
os_.rdbuf (&to_adapter_);
}
/*
template <typename Arg0>
Clip (std::basic_ostream<C>& os, Arg0 a0)
: os_ (os),
prev_ (os_.rdbuf ()),
from_adapter_ (*prev_),
buffer_ (from_adapter_, a0),
to_adapter_ (buffer_)
{
os_.rdbuf (&to_adapter_);
}
*/
~Clip ()
{
try
{
buffer_.unbuffer ();
}
catch (...)
{
os_.rdbuf (prev_);
throw;
}
os_.rdbuf (prev_);
}
Buffer<C>&
buffer ()
{
return buffer_;
}
private:
std::basic_ostream<C>& os_;
std::basic_streambuf<C>* prev_;
FromStreambufAdapter<C> from_adapter_;
Buffer<C> buffer_;
ToStreambufAdapter<C> to_adapter_;
};
}
}
#include <backend-elements/indentation/clip.txx>
#endif // BACKEND_ELEMENTS_INDENTATION_CLIP_HXX
|
