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1 | /*============================================================================= |
2 | Copyright (c) 2013 Daniel James | |
3 | ||
4 | Use, modification and distribution is subject to the Boost Software | |
5 | License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
6 | http://www.boost.org/LICENSE_1_0.txt) | |
7 | =============================================================================*/ | |
8 | ||
9 | #include "glob.hpp" | |
10 | #include <cassert> | |
11 | ||
12 | namespace quickbook | |
13 | { | |
14 | typedef boost::string_ref::const_iterator glob_iterator; | |
15 | ||
16 | void check_glob_range(glob_iterator&, glob_iterator); | |
17 | void check_glob_escape(glob_iterator&, glob_iterator); | |
18 | ||
19 | bool match_section(glob_iterator& pattern_begin, glob_iterator pattern_end, | |
20 | glob_iterator& filename_begin, glob_iterator& filename_end); | |
21 | bool match_range(glob_iterator& pattern_begin, glob_iterator pattern_end, | |
22 | unsigned char x); | |
23 | ||
24 | bool check_glob(boost::string_ref pattern) | |
25 | { | |
26 | bool is_glob = false; | |
27 | bool is_ascii = true; | |
28 | ||
29 | glob_iterator begin = pattern.begin(); | |
30 | glob_iterator end = pattern.end(); | |
31 | ||
32 | while (begin != end) { | |
33 | if (*begin < 32 || *begin > 127) | |
34 | is_ascii = false; | |
35 | ||
36 | switch(*begin) { | |
37 | case '\\': | |
38 | check_glob_escape(begin, end); | |
39 | break; | |
40 | ||
41 | case '[': | |
42 | check_glob_range(begin, end); | |
43 | is_glob = true; | |
44 | break; | |
45 | ||
46 | case ']': | |
47 | throw glob_error("uneven square brackets"); | |
48 | ||
49 | case '?': | |
50 | is_glob = true; | |
51 | ++begin; | |
52 | break; | |
53 | ||
54 | case '*': | |
55 | is_glob = true; | |
56 | ++begin; | |
57 | ||
58 | if (begin != end && *begin == '*') { | |
59 | throw glob_error("'**' not supported"); | |
60 | } | |
61 | break; | |
62 | ||
63 | default: | |
64 | ++begin; | |
65 | } | |
66 | } | |
67 | ||
68 | if (is_glob && !is_ascii) | |
69 | throw glob_error("invalid character, globs are ascii only"); | |
70 | ||
71 | return is_glob; | |
72 | } | |
73 | ||
74 | void check_glob_range(glob_iterator& begin, glob_iterator end) | |
75 | { | |
76 | assert(begin != end && *begin == '['); | |
77 | ++begin; | |
78 | ||
79 | if (*begin == ']') | |
80 | throw glob_error("empty range"); | |
81 | ||
82 | while (begin != end) { | |
83 | switch (*begin) { | |
84 | case '\\': | |
85 | ++begin; | |
86 | ||
87 | if (begin == end) { | |
88 | throw glob_error("trailing escape"); | |
89 | } | |
90 | else if (*begin == '\\' || *begin == '/') { | |
91 | throw glob_error("contains escaped slash"); | |
92 | } | |
93 | ||
94 | ++begin; | |
95 | break; | |
96 | case '[': | |
97 | // TODO: Allow? | |
98 | throw glob_error("nested square brackets"); | |
99 | case ']': | |
100 | ++begin; | |
101 | return; | |
102 | case '/': | |
103 | throw glob_error("slash in square brackets"); | |
104 | default: | |
105 | ++begin; | |
106 | } | |
107 | } | |
108 | ||
109 | throw glob_error("uneven square brackets"); | |
110 | } | |
111 | ||
112 | void check_glob_escape(glob_iterator& begin, glob_iterator end) | |
113 | { | |
114 | assert(begin != end && *begin == '\\'); | |
115 | ||
116 | ++begin; | |
117 | ||
118 | if (begin == end) { | |
119 | throw glob_error("trailing escape"); | |
120 | } | |
121 | else if (*begin == '\\' || *begin == '/') { | |
122 | throw glob_error("contains escaped slash"); | |
123 | } | |
124 | ||
125 | ++begin; | |
126 | } | |
127 | ||
128 | bool glob(boost::string_ref const& pattern, | |
129 | boost::string_ref const& filename) | |
130 | { | |
131 | // If there wasn't this special case then '*' would match an | |
132 | // empty string. | |
133 | if (filename.empty()) return pattern.empty(); | |
134 | ||
135 | glob_iterator pattern_it = pattern.begin(); | |
136 | glob_iterator pattern_end = pattern.end(); | |
137 | ||
138 | glob_iterator filename_it = filename.begin(); | |
139 | glob_iterator filename_end = filename.end(); | |
140 | ||
141 | if (!match_section(pattern_it, pattern_end, filename_it, filename_end)) | |
142 | return false; | |
143 | ||
144 | while (pattern_it != pattern_end) { | |
145 | assert(*pattern_it == '*'); | |
146 | ++pattern_it; | |
147 | ||
148 | if (pattern_it == pattern_end) return true; | |
149 | ||
150 | // TODO: Error? | |
151 | if (*pattern_it == '*') return false; | |
152 | ||
153 | while (true) { | |
154 | if (filename_it == filename_end) return false; | |
155 | if (match_section(pattern_it, pattern_end, filename_it, filename_end)) | |
156 | break; | |
157 | ++filename_it; | |
158 | } | |
159 | } | |
160 | ||
161 | return filename_it == filename_end; | |
162 | } | |
163 | ||
164 | bool match_section(glob_iterator& pattern_begin, glob_iterator pattern_end, | |
165 | glob_iterator& filename_begin, glob_iterator& filename_end) | |
166 | { | |
167 | glob_iterator pattern_it = pattern_begin; | |
168 | glob_iterator filename_it = filename_begin; | |
169 | ||
170 | while (pattern_it != pattern_end && *pattern_it != '*') { | |
171 | if (filename_it == filename_end) return false; | |
172 | ||
173 | switch(*pattern_it) { | |
174 | case '*': | |
175 | assert(false); | |
176 | return false; | |
177 | case '[': | |
178 | if (!match_range(pattern_it, pattern_end, *filename_it)) | |
179 | return false; | |
180 | ++filename_it; | |
181 | break; | |
182 | case '?': | |
183 | ++pattern_it; | |
184 | ++filename_it; | |
185 | break; | |
186 | case '\\': | |
187 | ++pattern_it; | |
188 | if (pattern_it == pattern_end) return false; | |
189 | BOOST_FALLTHROUGH; | |
190 | default: | |
191 | if (*pattern_it != *filename_it) return false; | |
192 | ++pattern_it; | |
193 | ++filename_it; | |
194 | } | |
195 | } | |
196 | ||
197 | if (pattern_it == pattern_end && filename_it != filename_end) | |
198 | return false; | |
199 | ||
200 | pattern_begin = pattern_it; | |
201 | filename_begin = filename_it; | |
202 | return true; | |
203 | } | |
204 | ||
205 | bool match_range(glob_iterator& pattern_begin, glob_iterator pattern_end, | |
206 | unsigned char x) | |
207 | { | |
208 | assert(pattern_begin != pattern_end && *pattern_begin == '['); | |
209 | ++pattern_begin; | |
210 | if (pattern_begin == pattern_end) return false; | |
211 | ||
212 | bool invert_match = false; | |
213 | bool matched = false; | |
214 | ||
215 | if (*pattern_begin == '^') { | |
216 | invert_match = true; | |
217 | ++pattern_begin; | |
218 | if (pattern_begin == pattern_end) return false; | |
219 | } | |
220 | ||
221 | // Search for a match | |
222 | while (true) { | |
223 | unsigned char first = *pattern_begin; | |
224 | ++pattern_begin; | |
225 | if (first == ']') break; | |
226 | if (pattern_begin == pattern_end) return false; | |
227 | ||
228 | if (first == '\\') { | |
229 | first = *pattern_begin; | |
230 | ++pattern_begin; | |
231 | if (pattern_begin == pattern_end) return false; | |
232 | } | |
233 | ||
234 | if (*pattern_begin != '-') { | |
235 | matched = matched || (first == x); | |
236 | } | |
237 | else { | |
238 | ++pattern_begin; | |
239 | if (pattern_begin == pattern_end) return false; | |
240 | ||
241 | unsigned char second = *pattern_begin; | |
242 | ++pattern_begin; | |
243 | if (second == ']') { | |
244 | matched = matched || (first == x) || (x == '-'); | |
245 | break; | |
246 | } | |
247 | if (pattern_begin == pattern_end) return false; | |
248 | ||
249 | if (second == '\\') { | |
250 | second = *pattern_begin; | |
251 | ++pattern_begin; | |
252 | if (pattern_begin == pattern_end) return false; | |
253 | } | |
254 | ||
255 | // TODO: What if second < first? | |
256 | matched = matched || (first <= x && x <= second); | |
257 | } | |
258 | } | |
259 | ||
260 | return invert_match != matched; | |
261 | } | |
262 | ||
263 | std::size_t find_glob_char(boost::string_ref pattern, | |
264 | std::size_t pos) | |
265 | { | |
266 | // Weird style is because boost::string_ref's find_first_of | |
267 | // doesn't take a position argument. | |
268 | std::size_t removed = 0; | |
269 | ||
270 | while (true) { | |
271 | pos = pattern.find_first_of("[]?*\\"); | |
272 | if (pos == boost::string_ref::npos) return pos; | |
273 | if (pattern[pos] != '\\') return pos + removed; | |
274 | pattern.remove_prefix(pos + 2); | |
275 | removed += pos + 2; | |
276 | } | |
277 | } | |
278 | ||
279 | std::string glob_unescape(boost::string_ref pattern) | |
280 | { | |
281 | std::string result; | |
282 | ||
283 | while (true) { | |
284 | std::size_t pos = pattern.find("\\"); | |
285 | if (pos == boost::string_ref::npos) { | |
286 | result.append(pattern.data(), pattern.size()); | |
287 | break; | |
288 | } | |
289 | ||
290 | result.append(pattern.data(), pos); | |
291 | ++pos; | |
292 | if (pos < pattern.size()) { | |
293 | result += pattern[pos]; | |
294 | ++pos; | |
295 | } | |
296 | pattern.remove_prefix(pos); | |
297 | } | |
298 | ||
299 | return result; | |
300 | } | |
301 | } |