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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 http://www.gabi-soft.fr/codebase-en.html. | |
10 | ||
11 | #ifndef BOOST_IOSTREAMS_SHELL_COMMENTS_FILTER_HPP_INCLUDED | |
12 | #define BOOST_IOSTREAMS_SHELL_COMMENTS_FILTER_HPP_INCLUDED | |
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 shell_comments_stdio_filter : public stdio_filter { | |
25 | public: | |
26 | explicit shell_comments_stdio_filter(char comment_char = '#') | |
27 | : comment_char_(comment_char) | |
28 | { } | |
29 | private: | |
30 | void do_filter() | |
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); | |
42 | } | |
43 | } | |
44 | char comment_char_; | |
45 | }; | |
46 | ||
47 | class shell_comments_input_filter : public input_filter { | |
48 | public: | |
49 | explicit shell_comments_input_filter(char comment_char = '#') | |
50 | : comment_char_(comment_char), skip_(false) | |
51 | { } | |
52 | ||
53 | template<typename Source> | |
54 | int get(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 close(Source&) { skip_ = false; } | |
73 | private: | |
74 | char comment_char_; | |
75 | bool skip_; | |
76 | }; | |
77 | ||
78 | class shell_comments_output_filter : public output_filter { | |
79 | public: | |
80 | explicit shell_comments_output_filter(char comment_char = '#') | |
81 | : comment_char_(comment_char), skip_(false) | |
82 | { } | |
83 | ||
84 | template<typename Sink> | |
85 | bool put(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 close(Source&) { skip_ = false; } | |
101 | private: | |
102 | char comment_char_; | |
103 | bool skip_; | |
104 | }; | |
105 | ||
106 | class shell_comments_dual_use_filter : public dual_use_filter { | |
107 | public: | |
108 | explicit shell_comments_dual_use_filter(char comment_char = '#') | |
109 | : comment_char_(comment_char), skip_(false) | |
110 | { } | |
111 | ||
112 | template<typename Source> | |
113 | int get(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 put(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 close(Device&, BOOST_IOS::openmode) { skip_ = false; } | |
147 | private: | |
148 | char comment_char_; | |
149 | bool skip_; | |
150 | }; | |
151 | ||
152 | class shell_comments_multichar_input_filter : public multichar_input_filter { | |
153 | public: | |
154 | explicit shell_comments_multichar_input_filter(char comment_char = '#') | |
155 | : comment_char_(comment_char), skip_(false) | |
156 | { } | |
157 | ||
158 | template<typename Source> | |
159 | std::streamsize read(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 close(Source&) { skip_ = false; } | |
183 | private: | |
184 | char comment_char_; | |
185 | bool skip_; | |
186 | }; | |
187 | ||
188 | class shell_comments_multichar_output_filter : public multichar_output_filter { | |
189 | public: | |
190 | explicit shell_comments_multichar_output_filter(char comment_char = '#') | |
191 | : comment_char_(comment_char), skip_(false) | |
192 | { } | |
193 | ||
194 | template<typename Sink> | |
195 | std::streamsize write(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 close(Source&) { skip_ = false; } | |
215 | private: | |
216 | char comment_char_; | |
217 | bool skip_; | |
218 | }; | |
219 | ||
220 | } } } // End namespaces example, iostreams, boost. | |
221 | ||
222 | #endif // #ifndef BOOST_IOSTREAMS_SHELL_COMMENTS_FILTER_HPP_INCLUDED |