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0c93b91d BE |
1 | /* |
2 | * Copyright © 2008 Red Hat, Inc. | |
3 | * | |
4 | * Red Hat Author(s): Behdad Esfahbod | |
5 | * | |
6 | * Permission to use, copy, modify, distribute, and sell this software and its | |
7 | * documentation for any purpose is hereby granted without fee, provided that | |
8 | * the above copyright notice appear in all copies and that both that | |
9 | * copyright notice and this permission notice appear in supporting | |
10 | * documentation, and that the name of Keith Packard not be used in | |
11 | * advertising or publicity pertaining to distribution of the software without | |
12 | * specific, written prior permission. Keith Packard makes no | |
13 | * representations about the suitability of this software for any purpose. It | |
14 | * is provided "as is" without express or implied warranty. | |
15 | * | |
16 | * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, | |
17 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO | |
18 | * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR | |
19 | * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, | |
20 | * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER | |
21 | * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR | |
22 | * PERFORMANCE OF THIS SOFTWARE. | |
23 | */ | |
24 | ||
25 | #include "fcint.h" | |
26 | #include <stdlib.h> | |
27 | #include <string.h> | |
28 | #include <stdarg.h> | |
29 | ||
30 | ||
31 | static void | |
32 | message (const char *fmt, ...) | |
33 | { | |
34 | va_list args; | |
35 | va_start (args, fmt); | |
8c31a243 | 36 | fprintf (stderr, "Fontconfig: Pattern format error: "); |
0c93b91d | 37 | vfprintf (stderr, fmt, args); |
d6506ff6 | 38 | fprintf (stderr, ".\n"); |
0c93b91d BE |
39 | va_end (args); |
40 | } | |
41 | ||
42 | ||
27b3e2dd | 43 | typedef struct _FcFormatContext |
0c93b91d | 44 | { |
27b3e2dd BE |
45 | const FcChar8 *format_orig; |
46 | const FcChar8 *format; | |
47 | int format_len; | |
48 | FcChar8 *scratch; | |
49 | } FcFormatContext; | |
c493c3b7 | 50 | |
8c31a243 | 51 | static FcBool |
27b3e2dd BE |
52 | FcFormatContextInit (FcFormatContext *c, |
53 | const FcChar8 *format) | |
54 | { | |
55 | c->format_orig = c->format = format; | |
56 | c->format_len = strlen ((const char *) format); | |
57 | c->scratch = malloc (c->format_len + 1); | |
8c31a243 BE |
58 | |
59 | return c->scratch != NULL; | |
27b3e2dd | 60 | } |
c493c3b7 | 61 | |
27b3e2dd BE |
62 | static void |
63 | FcFormatContextDone (FcFormatContext *c) | |
64 | { | |
65 | if (c) | |
66 | { | |
67 | free (c->scratch); | |
68 | } | |
69 | } | |
c493c3b7 | 70 | |
27b3e2dd BE |
71 | static FcBool |
72 | consume_char (FcFormatContext *c, | |
73 | FcChar8 term) | |
74 | { | |
75 | if (*c->format != term) | |
d6506ff6 BE |
76 | return FcFalse; |
77 | ||
78 | c->format++; | |
79 | return FcTrue; | |
80 | } | |
81 | ||
82 | static FcBool | |
83 | expect_char (FcFormatContext *c, | |
84 | FcChar8 term) | |
85 | { | |
86 | FcBool res = consume_char (c, term); | |
87 | if (!res) | |
88 | { | |
89 | if (c->format == c->format_orig + c->format_len) | |
90 | message ("format ended while expecting '%c'", | |
91 | term); | |
92 | else | |
93 | message ("expected '%c' at %d", | |
94 | term, c->format - c->format_orig + 1); | |
95 | } | |
96 | return res; | |
97 | } | |
98 | ||
99 | static FcBool | |
100 | FcCharIsPunct (const FcChar8 c) | |
101 | { | |
102 | if (c < '0') | |
103 | return FcTrue; | |
104 | if (c <= '9') | |
105 | return FcFalse; | |
106 | if (c < 'A') | |
107 | return FcTrue; | |
108 | if (c <= 'Z') | |
109 | return FcFalse; | |
110 | if (c < 'a') | |
111 | return FcTrue; | |
112 | if (c <= 'z') | |
113 | return FcFalse; | |
114 | if (c <= '~') | |
115 | return FcTrue; | |
116 | return FcFalse; | |
117 | } | |
118 | ||
119 | static FcBool | |
120 | read_elt_name_to_scratch (FcFormatContext *c) | |
121 | { | |
122 | FcChar8 *p; | |
123 | ||
124 | p = c->scratch; | |
125 | ||
126 | while (*c->format) | |
127 | { | |
128 | if (*c->format == '\\') | |
129 | { | |
130 | c->format++; | |
131 | if (*c->format) | |
132 | c->format++; | |
133 | continue; | |
134 | } | |
135 | else if (FcCharIsPunct (*c->format)) | |
136 | break; | |
137 | ||
138 | *p++ = *c->format++; | |
139 | } | |
140 | *p = '\0'; | |
141 | ||
142 | if (p == c->scratch) | |
0c93b91d | 143 | { |
d6506ff6 BE |
144 | message ("expected element name at %d", |
145 | c->format - c->format_orig + 1); | |
27b3e2dd BE |
146 | return FcFalse; |
147 | } | |
0c93b91d | 148 | |
27b3e2dd BE |
149 | return FcTrue; |
150 | } | |
0c93b91d | 151 | |
8c31a243 | 152 | static FcBool |
d6506ff6 BE |
153 | interpret (FcFormatContext *c, |
154 | FcPattern *pat, | |
155 | FcStrBuf *buf, | |
156 | FcChar8 term); | |
157 | ||
8c31a243 BE |
158 | static FcBool |
159 | interpret_subexpr (FcFormatContext *c, | |
27b3e2dd BE |
160 | FcPattern *pat, |
161 | FcStrBuf *buf) | |
162 | { | |
8c31a243 BE |
163 | return expect_char (c, '{') && |
164 | interpret (c, pat, buf, '}') && | |
165 | expect_char (c, '}'); | |
166 | } | |
0c93b91d | 167 | |
8c31a243 BE |
168 | static FcBool |
169 | interpret_simple_tag (FcFormatContext *c, | |
170 | FcPattern *pat, | |
171 | FcStrBuf *buf) | |
172 | { | |
173 | FcPatternElt *e; | |
d6506ff6 BE |
174 | FcBool add_colon = FcFalse; |
175 | FcBool add_elt_name = FcFalse; | |
176 | ||
8c31a243 | 177 | if (consume_char (c, ':')) |
d6506ff6 | 178 | add_colon = FcTrue; |
d6506ff6 | 179 | |
d6506ff6 | 180 | if (!read_elt_name_to_scratch (c)) |
8c31a243 | 181 | return FcFalse; |
d6506ff6 BE |
182 | |
183 | if (consume_char (c, '=')) | |
184 | add_elt_name = FcTrue; | |
185 | ||
186 | e = FcPatternObjectFindElt (pat, | |
187 | FcObjectFromName ((const char *) c->scratch)); | |
27b3e2dd BE |
188 | if (e) |
189 | { | |
190 | FcValueListPtr l; | |
d6506ff6 BE |
191 | |
192 | if (add_colon) | |
193 | FcStrBufChar (buf, ':'); | |
194 | if (add_elt_name) | |
195 | { | |
196 | FcStrBufString (buf, c->scratch); | |
197 | FcStrBufChar (buf, '='); | |
198 | } | |
199 | ||
27b3e2dd BE |
200 | l = FcPatternEltValues(e); |
201 | FcNameUnparseValueList (buf, l, '\0'); | |
c493c3b7 BE |
202 | } |
203 | ||
8c31a243 BE |
204 | return FcTrue; |
205 | } | |
206 | ||
207 | static FcBool | |
208 | interpret_filter (FcFormatContext *c, | |
209 | FcPattern *pat, | |
210 | FcStrBuf *buf) | |
211 | { | |
212 | FcObjectSet *os; | |
213 | FcPattern *subpat; | |
214 | ||
215 | if (!expect_char (c, '+')) | |
216 | return FcFalse; | |
217 | ||
218 | os = FcObjectSetCreate (); | |
219 | if (!os) | |
220 | return FcFalse; | |
221 | ||
222 | do | |
223 | { | |
224 | if (!read_elt_name_to_scratch (c) || | |
225 | !FcObjectSetAdd (os, (const char *) c->scratch)) | |
226 | { | |
227 | FcObjectSetDestroy (os); | |
228 | return FcFalse; | |
229 | } | |
230 | } | |
231 | while (consume_char (c, ',')); | |
232 | ||
233 | subpat = FcPatternFilter (pat, os); | |
234 | FcObjectSetDestroy (os); | |
235 | ||
236 | if (!subpat || | |
237 | !interpret_subexpr (c, subpat, buf)) | |
238 | return FcFalse; | |
239 | ||
240 | FcPatternDestroy (subpat); | |
241 | return FcTrue; | |
242 | } | |
243 | ||
244 | static FcBool | |
245 | interpret_delete (FcFormatContext *c, | |
246 | FcPattern *pat, | |
247 | FcStrBuf *buf) | |
248 | { | |
249 | FcPattern *subpat; | |
250 | ||
251 | if (!expect_char (c, '-')) | |
252 | return FcFalse; | |
253 | ||
254 | subpat = FcPatternDuplicate (pat); | |
255 | if (!subpat) | |
256 | return FcFalse; | |
257 | ||
258 | do | |
259 | { | |
260 | if (!read_elt_name_to_scratch (c)) | |
261 | { | |
262 | FcPatternDestroy (subpat); | |
263 | return FcFalse; | |
264 | } | |
265 | ||
266 | FcPatternDel (subpat, (const char *) c->scratch); | |
267 | } | |
268 | while (consume_char (c, ',')); | |
269 | ||
270 | if (!interpret_subexpr (c, subpat, buf)) | |
271 | return FcFalse; | |
272 | ||
273 | FcPatternDestroy (subpat); | |
274 | return FcTrue; | |
275 | } | |
276 | ||
277 | static FcBool | |
278 | interpret_percent (FcFormatContext *c, | |
279 | FcPattern *pat, | |
280 | FcStrBuf *buf) | |
281 | { | |
282 | int width, before; | |
283 | ||
284 | if (!expect_char (c, '%')) | |
285 | return FcFalse; | |
286 | ||
287 | if (consume_char (c, '%')) /* "%%" */ | |
288 | { | |
289 | FcStrBufChar (buf, '%'); | |
290 | return FcTrue; | |
291 | } | |
292 | ||
293 | /* parse an optional width specifier */ | |
294 | width = strtol ((const char *) c->format, (char **) &c->format, 10); | |
295 | ||
296 | before = buf->len; | |
297 | ||
298 | if (!expect_char (c, '{')) | |
299 | return FcFalse; | |
300 | ||
301 | switch (*c->format) { | |
302 | ||
303 | case '{': | |
304 | /* subexpression */ | |
305 | if (!interpret_subexpr (c, pat, buf)) | |
306 | return FcFalse; | |
307 | break; | |
308 | ||
309 | case '+': | |
310 | /* filtering pattern elements */ | |
311 | if (!interpret_filter (c, pat, buf)) | |
312 | return FcFalse; | |
313 | break; | |
314 | ||
315 | case '-': | |
316 | /* deleting pattern elements */ | |
317 | if (!interpret_delete (c, pat, buf)) | |
318 | return FcFalse; | |
319 | break; | |
320 | ||
321 | default: | |
322 | /* simple tag */ | |
323 | if (!interpret_simple_tag (c, pat, buf)) | |
324 | return FcFalse; | |
325 | break; | |
326 | ||
327 | } | |
328 | ||
27b3e2dd BE |
329 | /* handle filters, if any */ |
330 | /* XXX */ | |
331 | ||
c493c3b7 BE |
332 | /* align to width */ |
333 | if (!buf->failed) | |
334 | { | |
335 | int after, len; | |
336 | ||
337 | after = buf->len; | |
338 | ||
339 | len = after - before; | |
340 | ||
341 | if (len < -width) | |
342 | { | |
343 | /* left align */ | |
344 | while (len++ < -width) | |
345 | FcStrBufChar (buf, ' '); | |
346 | } | |
347 | else if (len < width) | |
348 | { | |
349 | /* right align */ | |
350 | while (len++ < width) | |
351 | FcStrBufChar (buf, ' '); | |
352 | len = after - before; | |
353 | memmove (buf->buf + buf->len - len, | |
354 | buf->buf + buf->len - width, | |
355 | len); | |
356 | memset (buf->buf + buf->len - width, | |
357 | ' ', | |
358 | width - len); | |
359 | } | |
0c93b91d | 360 | } |
c493c3b7 | 361 | |
8c31a243 | 362 | return expect_char (c, '}'); |
0c93b91d BE |
363 | } |
364 | ||
365 | static char escaped_char(const char ch) | |
366 | { | |
367 | switch (ch) { | |
368 | case 'a': return '\a'; | |
369 | case 'b': return '\b'; | |
370 | case 'f': return '\f'; | |
371 | case 'n': return '\n'; | |
372 | case 'r': return '\r'; | |
373 | case 't': return '\t'; | |
374 | case 'v': return '\v'; | |
375 | default: return ch; | |
376 | } | |
377 | } | |
378 | ||
8c31a243 | 379 | static FcBool |
27b3e2dd BE |
380 | interpret (FcFormatContext *c, |
381 | FcPattern *pat, | |
382 | FcStrBuf *buf, | |
383 | FcChar8 term) | |
0c93b91d | 384 | { |
27b3e2dd | 385 | for (; *c->format && *c->format != term;) |
0c93b91d | 386 | { |
27b3e2dd | 387 | switch (*c->format) |
0c93b91d BE |
388 | { |
389 | case '\\': | |
27b3e2dd BE |
390 | c->format++; /* skip over '\\' */ |
391 | if (*c->format) | |
392 | FcStrBufChar (buf, escaped_char (*c->format++)); | |
0c93b91d BE |
393 | continue; |
394 | case '%': | |
8c31a243 BE |
395 | if (!interpret_percent (c, pat, buf)) |
396 | return FcFalse; | |
0c93b91d BE |
397 | continue; |
398 | } | |
27b3e2dd | 399 | FcStrBufChar (buf, *c->format++); |
0c93b91d | 400 | } |
8c31a243 | 401 | return FcTrue; |
0c93b91d BE |
402 | } |
403 | ||
404 | FcChar8 * | |
405 | FcPatternFormat (FcPattern *pat, const FcChar8 *format) | |
406 | { | |
0c93b91d | 407 | FcStrBuf buf; |
27b3e2dd | 408 | FcFormatContext c; |
8c31a243 | 409 | FcBool ret; |
0c93b91d BE |
410 | |
411 | FcStrBufInit (&buf, 0, 0); | |
8c31a243 BE |
412 | if (!FcFormatContextInit (&c, format)) |
413 | return NULL; | |
0c93b91d | 414 | |
8c31a243 BE |
415 | ret = interpret (&c, pat, &buf, '\0'); |
416 | if (buf.failed) | |
417 | ret = FcFalse; | |
0c93b91d | 418 | |
27b3e2dd | 419 | FcFormatContextDone (&c); |
8c31a243 BE |
420 | if (ret) |
421 | return FcStrBufDone (&buf); | |
422 | else | |
423 | { | |
424 | FcStrBufDestroy (&buf); | |
425 | return NULL; | |
426 | } | |
0c93b91d BE |
427 | } |
428 | ||
429 | #define __fcformat__ | |
430 | #include "fcaliastail.h" | |
431 | #undef __fcformat__ |