1 | // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com) |
2 | // (C) Copyright 2005-2007 Jonathan Turkanis |
3 | // Distributed under the Boost Software License, Version 1.0. (See accompanying |
4 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.) |
5 | |
6 | // See http://www.boost.org/libs/iostreams for documentation. |
7 | |
8 | // Adapted from an example of James Kanze, with suggestions from Peter Dimov. |
9 | // See https://web.archive.org/web/20041222094942/http://www.gabi-soft.fr/codebase-en.html. |
10 | |
11 | #ifndef BOOST_IOSTREAMS_SHELL_COMMENTS_FILTER_HPP_INCLUDED |
12 | #define |
13 | |
14 | #include <cassert> |
15 | #include <cstdio> // EOF. |
16 | #include <iostream> // cin, cout. |
17 | #include <boost/iostreams/concepts.hpp> |
18 | #include <boost/iostreams/detail/ios.hpp> // BOOST_IOS. |
19 | #include <boost/iostreams/filter/stdio.hpp> |
20 | #include <boost/iostreams/operations.hpp> |
21 | |
22 | namespace boost { namespace iostreams { namespace example { |
23 | |
24 | class : public stdio_filter { |
25 | public: |
26 | explicit (char = '#') |
27 | : comment_char_(comment_char) |
28 | { } |
29 | private: |
30 | void () |
31 | { |
32 | bool skip = false; |
33 | int c; |
34 | while ((c = std::cin.get()) != EOF) { |
35 | skip = c == comment_char_ ? |
36 | true : |
37 | c == '\n' ? |
38 | false : |
39 | skip; |
40 | if (!skip) |
41 | std::cout.put(c: c); |
42 | } |
43 | } |
44 | char ; |
45 | }; |
46 | |
47 | class : public input_filter { |
48 | public: |
49 | explicit (char = '#') |
50 | : comment_char_(comment_char), skip_(false) |
51 | { } |
52 | |
53 | template<typename Source> |
54 | int (Source& src) |
55 | { |
56 | int c; |
57 | while (true) { |
58 | if ((c = boost::iostreams::get(src)) == EOF || c == WOULD_BLOCK) |
59 | break; |
60 | skip_ = c == comment_char_ ? |
61 | true : |
62 | c == '\n' ? |
63 | false : |
64 | skip_; |
65 | if (!skip_) |
66 | break; |
67 | } |
68 | return c; |
69 | } |
70 | |
71 | template<typename Source> |
72 | void (Source&) { skip_ = false; } |
73 | private: |
74 | char ; |
75 | bool ; |
76 | }; |
77 | |
78 | class : public output_filter { |
79 | public: |
80 | explicit (char = '#') |
81 | : comment_char_(comment_char), skip_(false) |
82 | { } |
83 | |
84 | template<typename Sink> |
85 | bool (Sink& dest, int c) |
86 | { |
87 | skip_ = c == comment_char_ ? |
88 | true : |
89 | c == '\n' ? |
90 | false : |
91 | skip_; |
92 | |
93 | if (skip_) |
94 | return true; |
95 | |
96 | return iostreams::put(dest, c); |
97 | } |
98 | |
99 | template<typename Source> |
100 | void (Source&) { skip_ = false; } |
101 | private: |
102 | char ; |
103 | bool ; |
104 | }; |
105 | |
106 | class : public dual_use_filter { |
107 | public: |
108 | explicit (char = '#') |
109 | : comment_char_(comment_char), skip_(false) |
110 | { } |
111 | |
112 | template<typename Source> |
113 | int (Source& src) |
114 | { |
115 | int c; |
116 | while (true) { |
117 | if ((c = boost::iostreams::get(src)) == EOF || c == WOULD_BLOCK) |
118 | break; |
119 | skip_ = c == comment_char_ ? |
120 | true : |
121 | c == '\n' ? |
122 | false : |
123 | skip_; |
124 | if (!skip_) |
125 | break; |
126 | } |
127 | return c; |
128 | } |
129 | |
130 | template<typename Sink> |
131 | bool (Sink& dest, int c) |
132 | { |
133 | skip_ = c == comment_char_ ? |
134 | true : |
135 | c == '\n' ? |
136 | false : |
137 | skip_; |
138 | |
139 | if (skip_) |
140 | return true; |
141 | |
142 | return iostreams::put(dest, c); |
143 | } |
144 | |
145 | template<typename Device> |
146 | void (Device&, BOOST_IOS::openmode) { skip_ = false; } |
147 | private: |
148 | char ; |
149 | bool ; |
150 | }; |
151 | |
152 | class : public multichar_input_filter { |
153 | public: |
154 | explicit (char = '#') |
155 | : comment_char_(comment_char), skip_(false) |
156 | { } |
157 | |
158 | template<typename Source> |
159 | std::streamsize (Source& src, char* s, std::streamsize n) |
160 | { |
161 | for (std::streamsize z = 0; z < n; ++z) { |
162 | int c; |
163 | while (true) { |
164 | if ((c = boost::iostreams::get(src)) == EOF) |
165 | return z != 0 ? z : -1; |
166 | else if (c == WOULD_BLOCK) |
167 | return z; |
168 | skip_ = c == comment_char_ ? |
169 | true : |
170 | c == '\n' ? |
171 | false : |
172 | skip_; |
173 | if (!skip_) |
174 | break; |
175 | } |
176 | s[z] = c; |
177 | } |
178 | return n; |
179 | } |
180 | |
181 | template<typename Source> |
182 | void (Source&) { skip_ = false; } |
183 | private: |
184 | char ; |
185 | bool ; |
186 | }; |
187 | |
188 | class : public multichar_output_filter { |
189 | public: |
190 | explicit (char = '#') |
191 | : comment_char_(comment_char), skip_(false) |
192 | { } |
193 | |
194 | template<typename Sink> |
195 | std::streamsize (Sink& dest, const char* s, std::streamsize n) |
196 | { |
197 | std::streamsize z; |
198 | for (z = 0; z < n; ++z) { |
199 | int c = s[z]; |
200 | skip_ = c == comment_char_ ? |
201 | true : |
202 | c == '\n' ? |
203 | false : |
204 | skip_; |
205 | if (skip_) |
206 | continue; |
207 | if (!iostreams::put(dest, c)) |
208 | break; |
209 | } |
210 | return z; |
211 | } |
212 | |
213 | template<typename Source> |
214 | void (Source&) { skip_ = false; } |
215 | private: |
216 | char ; |
217 | bool ; |
218 | }; |
219 | |
220 | } } } // End namespaces example, iostreams, boost. |
221 | |
222 | #endif // #ifndef BOOST_IOSTREAMS_SHELL_COMMENTS_FILTER_HPP_INCLUDED |
223 | |