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1 | /* | |
2 | * Copyright © 2008,2009 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 | * THE AUTHOR(S) DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, | |
17 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO | |
18 | * EVENT SHALL THE AUTHOR(S) 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 | /* The language is documented in doc/fcformat.fncs | |
32 | * These are the features implemented: | |
33 | * | |
34 | * simple %{elt} | |
35 | * width %width{elt} | |
36 | * index %{elt[idx]} | |
37 | * name= %{elt=} | |
38 | * :name= %{:elt} | |
39 | * default %{elt:-word} | |
40 | * count %{#elt} | |
41 | * subexpr %{{expr}} | |
42 | * filter-out %{-elt1,elt2,elt3{expr}} | |
43 | * filter-in %{+elt1,elt2,elt3{expr}} | |
44 | * conditional %{?elt1,elt2,!elt3{}{}} | |
45 | * enumerate %{[]elt1,elt2{expr}} | |
46 | * langset langset enumeration using the same syntax | |
47 | * builtin %{=blt} | |
48 | * convert %{elt|conv1|conv2|conv3} | |
49 | * | |
50 | * converters: | |
51 | * basename FcStrBasename | |
52 | * dirname FcStrDirname | |
53 | * downcase FcStrDowncase | |
54 | * shescape | |
55 | * cescape | |
56 | * xmlescape | |
57 | * delete delete chars | |
58 | * escape escape chars | |
59 | * translate translate chars | |
60 | * | |
61 | * builtins: | |
62 | * unparse FcNameUnparse | |
63 | * fcmatch fc-match default | |
64 | * fclist fc-list default | |
65 | * pkgkit PackageKit package tag format | |
66 | * | |
67 | * | |
68 | * Some ideas for future syntax extensions: | |
69 | * | |
70 | * - verbose builtin that is like FcPatternPrint | |
71 | * - allow indexing subexprs using '%{[idx]elt1,elt2{subexpr}}' | |
72 | * - conditional/filtering/deletion on binding (using '(w)'/'(s)'/'(=)' notation) | |
73 | */ | |
74 | ||
75 | ||
76 | #define FCMATCH_FORMAT "%{file:-<unknown filename>|basename}: \"%{family[0]:-<unknown family>}\" \"%{style[0]:-<unknown style>}\"" | |
77 | #define FCLIST_FORMAT "%{?file{%{file}: }}%{=unparse}" | |
78 | #define PKGKIT_FORMAT "%{[]family{font(%{family|downcase|delete( )})\n}}%{[]lang{font(:lang=%{lang|downcase|translate(_,-)})\n}}" | |
79 | ||
80 | ||
81 | static void | |
82 | message (const char *fmt, ...) | |
83 | { | |
84 | va_list args; | |
85 | va_start (args, fmt); | |
86 | fprintf (stderr, "Fontconfig: Pattern format error: "); | |
87 | vfprintf (stderr, fmt, args); | |
88 | fprintf (stderr, ".\n"); | |
89 | va_end (args); | |
90 | } | |
91 | ||
92 | ||
93 | typedef struct _FcFormatContext | |
94 | { | |
95 | const FcChar8 *format_orig; | |
96 | const FcChar8 *format; | |
97 | int format_len; | |
98 | FcChar8 *word; | |
99 | FcBool word_allocated; | |
100 | } FcFormatContext; | |
101 | ||
102 | static FcBool | |
103 | FcFormatContextInit (FcFormatContext *c, | |
104 | const FcChar8 *format, | |
105 | FcChar8 *scratch, | |
106 | int scratch_len) | |
107 | { | |
108 | c->format_orig = c->format = format; | |
109 | c->format_len = strlen ((const char *) format); | |
110 | ||
111 | if (c->format_len < scratch_len) | |
112 | { | |
113 | c->word = scratch; | |
114 | c->word_allocated = FcFalse; | |
115 | } | |
116 | else | |
117 | { | |
118 | c->word = malloc (c->format_len + 1); | |
119 | c->word_allocated = FcTrue; | |
120 | } | |
121 | ||
122 | return c->word != NULL; | |
123 | } | |
124 | ||
125 | static void | |
126 | FcFormatContextDone (FcFormatContext *c) | |
127 | { | |
128 | if (c && c->word_allocated) | |
129 | { | |
130 | free (c->word); | |
131 | } | |
132 | } | |
133 | ||
134 | static FcBool | |
135 | consume_char (FcFormatContext *c, | |
136 | FcChar8 term) | |
137 | { | |
138 | if (*c->format != term) | |
139 | return FcFalse; | |
140 | ||
141 | c->format++; | |
142 | return FcTrue; | |
143 | } | |
144 | ||
145 | static FcBool | |
146 | expect_char (FcFormatContext *c, | |
147 | FcChar8 term) | |
148 | { | |
149 | FcBool res = consume_char (c, term); | |
150 | if (!res) | |
151 | { | |
152 | if (c->format == c->format_orig + c->format_len) | |
153 | message ("format ended while expecting '%c'", | |
154 | term); | |
155 | else | |
156 | message ("expected '%c' at %d", | |
157 | term, c->format - c->format_orig + 1); | |
158 | } | |
159 | return res; | |
160 | } | |
161 | ||
162 | static FcBool | |
163 | FcCharIsPunct (const FcChar8 c) | |
164 | { | |
165 | if (c < '0') | |
166 | return FcTrue; | |
167 | if (c <= '9') | |
168 | return FcFalse; | |
169 | if (c < 'A') | |
170 | return FcTrue; | |
171 | if (c <= 'Z') | |
172 | return FcFalse; | |
173 | if (c < 'a') | |
174 | return FcTrue; | |
175 | if (c <= 'z') | |
176 | return FcFalse; | |
177 | if (c <= '~') | |
178 | return FcTrue; | |
179 | return FcFalse; | |
180 | } | |
181 | ||
182 | static char escaped_char(const char ch) | |
183 | { | |
184 | switch (ch) { | |
185 | case 'a': return '\a'; | |
186 | case 'b': return '\b'; | |
187 | case 'f': return '\f'; | |
188 | case 'n': return '\n'; | |
189 | case 'r': return '\r'; | |
190 | case 't': return '\t'; | |
191 | case 'v': return '\v'; | |
192 | default: return ch; | |
193 | } | |
194 | } | |
195 | ||
196 | static FcBool | |
197 | read_word (FcFormatContext *c) | |
198 | { | |
199 | FcChar8 *p; | |
200 | ||
201 | p = c->word; | |
202 | ||
203 | while (*c->format) | |
204 | { | |
205 | if (*c->format == '\\') | |
206 | { | |
207 | c->format++; | |
208 | if (*c->format) | |
209 | *p++ = escaped_char (*c->format++); | |
210 | continue; | |
211 | } | |
212 | else if (FcCharIsPunct (*c->format)) | |
213 | break; | |
214 | ||
215 | *p++ = *c->format++; | |
216 | } | |
217 | *p = '\0'; | |
218 | ||
219 | if (p == c->word) | |
220 | { | |
221 | message ("expected identifier at %d", | |
222 | c->format - c->format_orig + 1); | |
223 | return FcFalse; | |
224 | } | |
225 | ||
226 | return FcTrue; | |
227 | } | |
228 | ||
229 | static FcBool | |
230 | read_chars (FcFormatContext *c, | |
231 | FcChar8 term) | |
232 | { | |
233 | FcChar8 *p; | |
234 | ||
235 | p = c->word; | |
236 | ||
237 | while (*c->format && *c->format != '}' && *c->format != term) | |
238 | { | |
239 | if (*c->format == '\\') | |
240 | { | |
241 | c->format++; | |
242 | if (*c->format) | |
243 | *p++ = escaped_char (*c->format++); | |
244 | continue; | |
245 | } | |
246 | ||
247 | *p++ = *c->format++; | |
248 | } | |
249 | *p = '\0'; | |
250 | ||
251 | if (p == c->word) | |
252 | { | |
253 | message ("expected character data at %d", | |
254 | c->format - c->format_orig + 1); | |
255 | return FcFalse; | |
256 | } | |
257 | ||
258 | return FcTrue; | |
259 | } | |
260 | ||
261 | static FcBool | |
262 | FcPatternFormatToBuf (FcPattern *pat, | |
263 | const FcChar8 *format, | |
264 | FcStrBuf *buf); | |
265 | ||
266 | static FcBool | |
267 | interpret_builtin (FcFormatContext *c, | |
268 | FcPattern *pat, | |
269 | FcStrBuf *buf) | |
270 | { | |
271 | FcChar8 *new_str; | |
272 | FcBool ret; | |
273 | ||
274 | if (!expect_char (c, '=') || | |
275 | !read_word (c)) | |
276 | return FcFalse; | |
277 | ||
278 | /* try simple builtins first */ | |
279 | if (0) { } | |
280 | #define BUILTIN(name, func) \ | |
281 | else if (0 == strcmp ((const char *) c->word, name))\ | |
282 | do { new_str = func (pat); ret = FcTrue; } while (0) | |
283 | BUILTIN ("unparse", FcNameUnparse); | |
284 | /* BUILTIN ("verbose", FcPatternPrint); XXX */ | |
285 | #undef BUILTIN | |
286 | else | |
287 | ret = FcFalse; | |
288 | ||
289 | if (ret) | |
290 | { | |
291 | if (new_str) | |
292 | { | |
293 | FcStrBufString (buf, new_str); | |
294 | free (new_str); | |
295 | return FcTrue; | |
296 | } | |
297 | else | |
298 | return FcFalse; | |
299 | } | |
300 | ||
301 | /* now try our custom formats */ | |
302 | if (0) { } | |
303 | #define BUILTIN(name, format) \ | |
304 | else if (0 == strcmp ((const char *) c->word, name))\ | |
305 | ret = FcPatternFormatToBuf (pat, (const FcChar8 *) format, buf) | |
306 | BUILTIN ("fcmatch", FCMATCH_FORMAT); | |
307 | BUILTIN ("fclist", FCLIST_FORMAT); | |
308 | BUILTIN ("pkgkit", PKGKIT_FORMAT); | |
309 | #undef BUILTIN | |
310 | else | |
311 | ret = FcFalse; | |
312 | ||
313 | if (!ret) | |
314 | message ("unknown builtin \"%s\"", | |
315 | c->word); | |
316 | ||
317 | return ret; | |
318 | } | |
319 | ||
320 | static FcBool | |
321 | interpret_expr (FcFormatContext *c, | |
322 | FcPattern *pat, | |
323 | FcStrBuf *buf, | |
324 | FcChar8 term); | |
325 | ||
326 | static FcBool | |
327 | interpret_subexpr (FcFormatContext *c, | |
328 | FcPattern *pat, | |
329 | FcStrBuf *buf) | |
330 | { | |
331 | return expect_char (c, '{') && | |
332 | interpret_expr (c, pat, buf, '}') && | |
333 | expect_char (c, '}'); | |
334 | } | |
335 | ||
336 | static FcBool | |
337 | maybe_interpret_subexpr (FcFormatContext *c, | |
338 | FcPattern *pat, | |
339 | FcStrBuf *buf) | |
340 | { | |
341 | return (*c->format == '{') ? | |
342 | interpret_subexpr (c, pat, buf) : | |
343 | FcTrue; | |
344 | } | |
345 | ||
346 | static FcBool | |
347 | skip_subexpr (FcFormatContext *c); | |
348 | ||
349 | static FcBool | |
350 | skip_percent (FcFormatContext *c) | |
351 | { | |
352 | int width; | |
353 | ||
354 | if (!expect_char (c, '%')) | |
355 | return FcFalse; | |
356 | ||
357 | /* skip an optional width specifier */ | |
358 | width = strtol ((const char *) c->format, (char **) &c->format, 10); | |
359 | ||
360 | if (!expect_char (c, '{')) | |
361 | return FcFalse; | |
362 | ||
363 | while(*c->format && *c->format != '}') | |
364 | { | |
365 | switch (*c->format) | |
366 | { | |
367 | case '\\': | |
368 | c->format++; /* skip over '\\' */ | |
369 | if (*c->format) | |
370 | c->format++; | |
371 | continue; | |
372 | case '{': | |
373 | if (!skip_subexpr (c)) | |
374 | return FcFalse; | |
375 | continue; | |
376 | } | |
377 | c->format++; | |
378 | } | |
379 | ||
380 | return expect_char (c, '}'); | |
381 | } | |
382 | ||
383 | static FcBool | |
384 | skip_expr (FcFormatContext *c) | |
385 | { | |
386 | while(*c->format && *c->format != '}') | |
387 | { | |
388 | switch (*c->format) | |
389 | { | |
390 | case '\\': | |
391 | c->format++; /* skip over '\\' */ | |
392 | if (*c->format) | |
393 | c->format++; | |
394 | continue; | |
395 | case '%': | |
396 | if (!skip_percent (c)) | |
397 | return FcFalse; | |
398 | continue; | |
399 | } | |
400 | c->format++; | |
401 | } | |
402 | ||
403 | return FcTrue; | |
404 | } | |
405 | ||
406 | static FcBool | |
407 | skip_subexpr (FcFormatContext *c) | |
408 | { | |
409 | return expect_char (c, '{') && | |
410 | skip_expr (c) && | |
411 | expect_char (c, '}'); | |
412 | } | |
413 | ||
414 | static FcBool | |
415 | maybe_skip_subexpr (FcFormatContext *c) | |
416 | { | |
417 | return (*c->format == '{') ? | |
418 | skip_subexpr (c) : | |
419 | FcTrue; | |
420 | } | |
421 | ||
422 | static FcBool | |
423 | interpret_filter_in (FcFormatContext *c, | |
424 | FcPattern *pat, | |
425 | FcStrBuf *buf) | |
426 | { | |
427 | FcObjectSet *os; | |
428 | FcPattern *subpat; | |
429 | ||
430 | if (!expect_char (c, '+')) | |
431 | return FcFalse; | |
432 | ||
433 | os = FcObjectSetCreate (); | |
434 | if (!os) | |
435 | return FcFalse; | |
436 | ||
437 | do | |
438 | { | |
439 | if (!read_word (c) || | |
440 | !FcObjectSetAdd (os, (const char *) c->word)) | |
441 | { | |
442 | FcObjectSetDestroy (os); | |
443 | return FcFalse; | |
444 | } | |
445 | } | |
446 | while (consume_char (c, ',')); | |
447 | ||
448 | subpat = FcPatternFilter (pat, os); | |
449 | FcObjectSetDestroy (os); | |
450 | ||
451 | if (!subpat || | |
452 | !interpret_subexpr (c, subpat, buf)) | |
453 | return FcFalse; | |
454 | ||
455 | FcPatternDestroy (subpat); | |
456 | return FcTrue; | |
457 | } | |
458 | ||
459 | static FcBool | |
460 | interpret_filter_out (FcFormatContext *c, | |
461 | FcPattern *pat, | |
462 | FcStrBuf *buf) | |
463 | { | |
464 | FcPattern *subpat; | |
465 | ||
466 | if (!expect_char (c, '-')) | |
467 | return FcFalse; | |
468 | ||
469 | subpat = FcPatternDuplicate (pat); | |
470 | if (!subpat) | |
471 | return FcFalse; | |
472 | ||
473 | do | |
474 | { | |
475 | if (!read_word (c)) | |
476 | { | |
477 | FcPatternDestroy (subpat); | |
478 | return FcFalse; | |
479 | } | |
480 | ||
481 | FcPatternDel (subpat, (const char *) c->word); | |
482 | } | |
483 | while (consume_char (c, ',')); | |
484 | ||
485 | if (!interpret_subexpr (c, subpat, buf)) | |
486 | return FcFalse; | |
487 | ||
488 | FcPatternDestroy (subpat); | |
489 | return FcTrue; | |
490 | } | |
491 | ||
492 | static FcBool | |
493 | interpret_cond (FcFormatContext *c, | |
494 | FcPattern *pat, | |
495 | FcStrBuf *buf) | |
496 | { | |
497 | FcBool pass; | |
498 | ||
499 | if (!expect_char (c, '?')) | |
500 | return FcFalse; | |
501 | ||
502 | pass = FcTrue; | |
503 | ||
504 | do | |
505 | { | |
506 | FcBool negate; | |
507 | FcValue v; | |
508 | ||
509 | negate = consume_char (c, '!'); | |
510 | ||
511 | if (!read_word (c)) | |
512 | return FcFalse; | |
513 | ||
514 | pass = pass && | |
515 | (negate ^ | |
516 | (FcResultMatch == | |
517 | FcPatternGet (pat, (const char *) c->word, 0, &v))); | |
518 | } | |
519 | while (consume_char (c, ',')); | |
520 | ||
521 | if (pass) | |
522 | { | |
523 | if (!interpret_subexpr (c, pat, buf) || | |
524 | !maybe_skip_subexpr (c)) | |
525 | return FcFalse; | |
526 | } | |
527 | else | |
528 | { | |
529 | if (!skip_subexpr (c) || | |
530 | !maybe_interpret_subexpr (c, pat, buf)) | |
531 | return FcFalse; | |
532 | } | |
533 | ||
534 | return FcTrue; | |
535 | } | |
536 | ||
537 | static FcBool | |
538 | interpret_count (FcFormatContext *c, | |
539 | FcPattern *pat, | |
540 | FcStrBuf *buf) | |
541 | { | |
542 | int count; | |
543 | FcPatternElt *e; | |
544 | FcChar8 buf_static[64]; | |
545 | ||
546 | if (!expect_char (c, '#')) | |
547 | return FcFalse; | |
548 | ||
549 | if (!read_word (c)) | |
550 | return FcFalse; | |
551 | ||
552 | count = 0; | |
553 | e = FcPatternObjectFindElt (pat, | |
554 | FcObjectFromName ((const char *) c->word)); | |
555 | if (e) | |
556 | { | |
557 | FcValueListPtr l; | |
558 | count++; | |
559 | for (l = FcPatternEltValues(e); | |
560 | l->next; | |
561 | l = l->next) | |
562 | count++; | |
563 | } | |
564 | ||
565 | snprintf ((char *) buf_static, sizeof (buf_static), "%d", count); | |
566 | FcStrBufString (buf, buf_static); | |
567 | ||
568 | return FcTrue; | |
569 | } | |
570 | ||
571 | static FcBool | |
572 | interpret_enumerate (FcFormatContext *c, | |
573 | FcPattern *pat, | |
574 | FcStrBuf *buf) | |
575 | { | |
576 | FcObjectSet *os; | |
577 | FcPattern *subpat; | |
578 | const FcChar8 *format_save; | |
579 | int idx; | |
580 | FcBool ret, done; | |
581 | FcStrList *lang_strs; | |
582 | ||
583 | if (!expect_char (c, '[') || | |
584 | !expect_char (c, ']')) | |
585 | return FcFalse; | |
586 | ||
587 | os = FcObjectSetCreate (); | |
588 | if (!os) | |
589 | return FcFalse; | |
590 | ||
591 | ret = FcTrue; | |
592 | ||
593 | do | |
594 | { | |
595 | if (!read_word (c) || | |
596 | !FcObjectSetAdd (os, (const char *) c->word)) | |
597 | { | |
598 | FcObjectSetDestroy (os); | |
599 | return FcFalse; | |
600 | } | |
601 | } | |
602 | while (consume_char (c, ',')); | |
603 | ||
604 | /* If we have one element and it's of type FcLangSet, we want | |
605 | * to enumerate the languages in it. */ | |
606 | lang_strs = NULL; | |
607 | if (os->nobject == 1) | |
608 | { | |
609 | FcLangSet *langset; | |
610 | if (FcResultMatch == | |
611 | FcPatternGetLangSet (pat, os->objects[0], idx, &langset)) | |
612 | { | |
613 | FcStrSet *ss; | |
614 | if (!(ss = FcLangSetGetLangs (langset)) || | |
615 | !(lang_strs = FcStrListCreate (ss))) | |
616 | goto bail0; | |
617 | } | |
618 | } | |
619 | ||
620 | subpat = FcPatternDuplicate (pat); | |
621 | if (!subpat) | |
622 | goto bail0; | |
623 | ||
624 | format_save = c->format; | |
625 | idx = 0; | |
626 | do | |
627 | { | |
628 | int i; | |
629 | ||
630 | done = FcTrue; | |
631 | ||
632 | if (lang_strs) | |
633 | { | |
634 | FcChar8 *lang; | |
635 | ||
636 | FcPatternDel (subpat, os->objects[0]); | |
637 | if ((lang = FcStrListNext (lang_strs))) | |
638 | { | |
639 | FcPatternAddString (subpat, os->objects[0], lang); | |
640 | done = FcFalse; | |
641 | } | |
642 | } | |
643 | else | |
644 | { | |
645 | for (i = 0; i < os->nobject; i++) | |
646 | { | |
647 | FcValue v; | |
648 | ||
649 | /* XXX this can be optimized by accessing valuelist linked lists | |
650 | * directly and remembering where we were. Most (all) value lists | |
651 | * in normal uses are pretty short though (language tags are | |
652 | * stored as a LangSet, not separate values.). */ | |
653 | FcPatternDel (subpat, os->objects[i]); | |
654 | if (FcResultMatch == | |
655 | FcPatternGet (pat, os->objects[i], idx, &v)) | |
656 | { | |
657 | FcPatternAdd (subpat, os->objects[i], v, FcFalse); | |
658 | done = FcFalse; | |
659 | } | |
660 | } | |
661 | } | |
662 | ||
663 | if (!done) | |
664 | { | |
665 | c->format = format_save; | |
666 | ret = interpret_subexpr (c, subpat, buf); | |
667 | if (!ret) | |
668 | goto bail; | |
669 | } | |
670 | ||
671 | idx++; | |
672 | } while (!done); | |
673 | ||
674 | if (c->format == format_save) | |
675 | skip_subexpr (c); | |
676 | ||
677 | bail: | |
678 | FcPatternDestroy (subpat); | |
679 | bail0: | |
680 | if (lang_strs) | |
681 | FcStrListDone (lang_strs); | |
682 | FcObjectSetDestroy (os); | |
683 | ||
684 | return ret; | |
685 | } | |
686 | ||
687 | static FcBool | |
688 | interpret_simple (FcFormatContext *c, | |
689 | FcPattern *pat, | |
690 | FcStrBuf *buf) | |
691 | { | |
692 | FcPatternElt *e; | |
693 | FcBool add_colon = FcFalse; | |
694 | FcBool add_elt_name = FcFalse; | |
695 | int idx; | |
696 | FcChar8 *else_string; | |
697 | ||
698 | if (consume_char (c, ':')) | |
699 | add_colon = FcTrue; | |
700 | ||
701 | if (!read_word (c)) | |
702 | return FcFalse; | |
703 | ||
704 | idx = -1; | |
705 | if (consume_char (c, '[')) | |
706 | { | |
707 | idx = strtol ((const char *) c->format, (char **) &c->format, 10); | |
708 | if (idx < 0) | |
709 | { | |
710 | message ("expected non-negative number at %d", | |
711 | c->format-1 - c->format_orig + 1); | |
712 | return FcFalse; | |
713 | } | |
714 | if (!expect_char (c, ']')) | |
715 | return FcFalse; | |
716 | } | |
717 | ||
718 | if (consume_char (c, '=')) | |
719 | add_elt_name = FcTrue; | |
720 | ||
721 | /* modifiers */ | |
722 | else_string = NULL; | |
723 | if (consume_char (c, ':')) | |
724 | { | |
725 | FcChar8 *orig; | |
726 | /* divert the c->word for now */ | |
727 | orig = c->word; | |
728 | c->word = c->word + strlen ((const char *) c->word) + 1; | |
729 | /* for now we just support 'default value' */ | |
730 | if (!expect_char (c, '-') || | |
731 | !read_chars (c, '\0')) | |
732 | { | |
733 | c->word = orig; | |
734 | return FcFalse; | |
735 | } | |
736 | else_string = c->word; | |
737 | c->word = orig; | |
738 | } | |
739 | ||
740 | e = FcPatternObjectFindElt (pat, | |
741 | FcObjectFromName ((const char *) c->word)); | |
742 | if (e || else_string) | |
743 | { | |
744 | FcValueListPtr l = NULL; | |
745 | ||
746 | if (add_colon) | |
747 | FcStrBufChar (buf, ':'); | |
748 | if (add_elt_name) | |
749 | { | |
750 | FcStrBufString (buf, c->word); | |
751 | FcStrBufChar (buf, '='); | |
752 | } | |
753 | ||
754 | if (e) | |
755 | l = FcPatternEltValues(e); | |
756 | ||
757 | if (idx != -1) | |
758 | { | |
759 | while (l && idx > 0) | |
760 | { | |
761 | l = FcValueListNext(l); | |
762 | idx--; | |
763 | } | |
764 | if (l && idx == 0) | |
765 | { | |
766 | if (!FcNameUnparseValue (buf, &l->value, '\0')) | |
767 | return FcFalse; | |
768 | } | |
769 | else goto notfound; | |
770 | } | |
771 | else if (l) | |
772 | { | |
773 | FcNameUnparseValueList (buf, l, '\0'); | |
774 | } | |
775 | else | |
776 | { | |
777 | notfound: | |
778 | if (else_string) | |
779 | FcStrBufString (buf, else_string); | |
780 | } | |
781 | } | |
782 | ||
783 | return FcTrue; | |
784 | } | |
785 | ||
786 | static FcBool | |
787 | cescape (FcFormatContext *c, | |
788 | const FcChar8 *str, | |
789 | FcStrBuf *buf) | |
790 | { | |
791 | while(*str) | |
792 | { | |
793 | switch (*str) | |
794 | { | |
795 | case '\\': | |
796 | case '"': | |
797 | FcStrBufChar (buf, '\\'); | |
798 | break; | |
799 | } | |
800 | FcStrBufChar (buf, *str++); | |
801 | } | |
802 | return FcTrue; | |
803 | } | |
804 | ||
805 | static FcBool | |
806 | shescape (FcFormatContext *c, | |
807 | const FcChar8 *str, | |
808 | FcStrBuf *buf) | |
809 | { | |
810 | FcStrBufChar (buf, '\''); | |
811 | while(*str) | |
812 | { | |
813 | if (*str == '\'') | |
814 | FcStrBufString (buf, (const FcChar8 *) "'\\''"); | |
815 | else | |
816 | FcStrBufChar (buf, *str); | |
817 | str++; | |
818 | } | |
819 | FcStrBufChar (buf, '\''); | |
820 | return FcTrue; | |
821 | } | |
822 | ||
823 | static FcBool | |
824 | xmlescape (FcFormatContext *c, | |
825 | const FcChar8 *str, | |
826 | FcStrBuf *buf) | |
827 | { | |
828 | while(*str) | |
829 | { | |
830 | switch (*str) | |
831 | { | |
832 | case '&': FcStrBufString (buf, (const FcChar8 *) "&"); break; | |
833 | case '<': FcStrBufString (buf, (const FcChar8 *) "<"); break; | |
834 | case '>': FcStrBufString (buf, (const FcChar8 *) ">"); break; | |
835 | default: FcStrBufChar (buf, *str); break; | |
836 | } | |
837 | str++; | |
838 | } | |
839 | return FcTrue; | |
840 | } | |
841 | ||
842 | static FcBool | |
843 | delete_chars (FcFormatContext *c, | |
844 | const FcChar8 *str, | |
845 | FcStrBuf *buf) | |
846 | { | |
847 | /* XXX not UTF-8 aware */ | |
848 | ||
849 | if (!expect_char (c, '(') || | |
850 | !read_chars (c, ')') || | |
851 | !expect_char (c, ')')) | |
852 | return FcFalse; | |
853 | ||
854 | while(*str) | |
855 | { | |
856 | FcChar8 *p; | |
857 | ||
858 | p = (FcChar8 *) strpbrk ((const char *) str, (const char *) c->word); | |
859 | if (p) | |
860 | { | |
861 | FcStrBufData (buf, str, p - str); | |
862 | str = p + 1; | |
863 | } | |
864 | else | |
865 | { | |
866 | FcStrBufString (buf, str); | |
867 | break; | |
868 | } | |
869 | ||
870 | } | |
871 | ||
872 | return FcTrue; | |
873 | } | |
874 | ||
875 | static FcBool | |
876 | escape_chars (FcFormatContext *c, | |
877 | const FcChar8 *str, | |
878 | FcStrBuf *buf) | |
879 | { | |
880 | /* XXX not UTF-8 aware */ | |
881 | ||
882 | if (!expect_char (c, '(') || | |
883 | !read_chars (c, ')') || | |
884 | !expect_char (c, ')')) | |
885 | return FcFalse; | |
886 | ||
887 | while(*str) | |
888 | { | |
889 | FcChar8 *p; | |
890 | ||
891 | p = (FcChar8 *) strpbrk ((const char *) str, (const char *) c->word); | |
892 | if (p) | |
893 | { | |
894 | FcStrBufData (buf, str, p - str); | |
895 | FcStrBufChar (buf, c->word[0]); | |
896 | FcStrBufChar (buf, *p); | |
897 | str = p + 1; | |
898 | } | |
899 | else | |
900 | { | |
901 | FcStrBufString (buf, str); | |
902 | break; | |
903 | } | |
904 | ||
905 | } | |
906 | ||
907 | return FcTrue; | |
908 | } | |
909 | ||
910 | static FcBool | |
911 | translate_chars (FcFormatContext *c, | |
912 | const FcChar8 *str, | |
913 | FcStrBuf *buf) | |
914 | { | |
915 | char *from, *to, repeat; | |
916 | int from_len, to_len; | |
917 | ||
918 | /* XXX not UTF-8 aware */ | |
919 | ||
920 | if (!expect_char (c, '(') || | |
921 | !read_chars (c, ',') || | |
922 | !expect_char (c, ',')) | |
923 | return FcFalse; | |
924 | ||
925 | from = (char *) c->word; | |
926 | from_len = strlen (from); | |
927 | to = from + from_len + 1; | |
928 | ||
929 | /* hack: we temporarily divert c->word */ | |
930 | c->word = (FcChar8 *) to; | |
931 | if (!read_chars (c, ')')) | |
932 | { | |
933 | c->word = (FcChar8 *) from; | |
934 | return FcFalse; | |
935 | } | |
936 | c->word = (FcChar8 *) from; | |
937 | ||
938 | to_len = strlen (to); | |
939 | repeat = to[to_len - 1]; | |
940 | ||
941 | if (!expect_char (c, ')')) | |
942 | return FcFalse; | |
943 | ||
944 | while(*str) | |
945 | { | |
946 | FcChar8 *p; | |
947 | ||
948 | p = (FcChar8 *) strpbrk ((const char *) str, (const char *) from); | |
949 | if (p) | |
950 | { | |
951 | int i; | |
952 | FcStrBufData (buf, str, p - str); | |
953 | i = strchr (from, *p) - from; | |
954 | FcStrBufChar (buf, i < to_len ? to[i] : repeat); | |
955 | str = p + 1; | |
956 | } | |
957 | else | |
958 | { | |
959 | FcStrBufString (buf, str); | |
960 | break; | |
961 | } | |
962 | ||
963 | } | |
964 | ||
965 | return FcTrue; | |
966 | } | |
967 | ||
968 | static FcBool | |
969 | interpret_convert (FcFormatContext *c, | |
970 | FcStrBuf *buf, | |
971 | int start) | |
972 | { | |
973 | const FcChar8 *str; | |
974 | FcChar8 *new_str; | |
975 | FcStrBuf new_buf; | |
976 | FcChar8 buf_static[8192]; | |
977 | FcBool ret; | |
978 | ||
979 | if (!expect_char (c, '|') || | |
980 | !read_word (c)) | |
981 | return FcFalse; | |
982 | ||
983 | /* prepare the buffer */ | |
984 | FcStrBufChar (buf, '\0'); | |
985 | if (buf->failed) | |
986 | return FcFalse; | |
987 | str = buf->buf + start; | |
988 | buf->len = start; | |
989 | ||
990 | /* try simple converters first */ | |
991 | if (0) { } | |
992 | #define CONVERTER(name, func) \ | |
993 | else if (0 == strcmp ((const char *) c->word, name))\ | |
994 | do { new_str = func (str); ret = FcTrue; } while (0) | |
995 | CONVERTER ("downcase", FcStrDowncase); | |
996 | CONVERTER ("basename", FcStrBasename); | |
997 | CONVERTER ("dirname", FcStrDirname); | |
998 | #undef CONVERTER | |
999 | else | |
1000 | ret = FcFalse; | |
1001 | ||
1002 | if (ret) | |
1003 | { | |
1004 | if (new_str) | |
1005 | { | |
1006 | FcStrBufString (buf, new_str); | |
1007 | free (new_str); | |
1008 | return FcTrue; | |
1009 | } | |
1010 | else | |
1011 | return FcFalse; | |
1012 | } | |
1013 | ||
1014 | FcStrBufInit (&new_buf, buf_static, sizeof (buf_static)); | |
1015 | ||
1016 | /* now try our custom converters */ | |
1017 | if (0) { } | |
1018 | #define CONVERTER(name, func) \ | |
1019 | else if (0 == strcmp ((const char *) c->word, name))\ | |
1020 | ret = func (c, str, &new_buf) | |
1021 | CONVERTER ("cescape", cescape); | |
1022 | CONVERTER ("shescape", shescape); | |
1023 | CONVERTER ("xmlescape", xmlescape); | |
1024 | CONVERTER ("delete", delete_chars); | |
1025 | CONVERTER ("escape", escape_chars); | |
1026 | CONVERTER ("translate", translate_chars); | |
1027 | #undef CONVERTER | |
1028 | else | |
1029 | ret = FcFalse; | |
1030 | ||
1031 | if (ret) | |
1032 | { | |
1033 | FcStrBufChar (&new_buf, '\0'); | |
1034 | FcStrBufString (buf, new_buf.buf); | |
1035 | } | |
1036 | else | |
1037 | message ("unknown converter \"%s\"", | |
1038 | c->word); | |
1039 | ||
1040 | FcStrBufDestroy (&new_buf); | |
1041 | ||
1042 | return ret; | |
1043 | } | |
1044 | ||
1045 | static FcBool | |
1046 | maybe_interpret_converts (FcFormatContext *c, | |
1047 | FcStrBuf *buf, | |
1048 | int start) | |
1049 | { | |
1050 | while (*c->format == '|') | |
1051 | if (!interpret_convert (c, buf, start)) | |
1052 | return FcFalse; | |
1053 | ||
1054 | return FcTrue; | |
1055 | } | |
1056 | ||
1057 | static FcBool | |
1058 | align_to_width (FcStrBuf *buf, | |
1059 | int start, | |
1060 | int width) | |
1061 | { | |
1062 | int len; | |
1063 | ||
1064 | if (buf->failed) | |
1065 | return FcFalse; | |
1066 | ||
1067 | len = buf->len - start; | |
1068 | if (len < -width) | |
1069 | { | |
1070 | /* left align */ | |
1071 | while (len++ < -width) | |
1072 | FcStrBufChar (buf, ' '); | |
1073 | } | |
1074 | else if (len < width) | |
1075 | { | |
1076 | int old_len; | |
1077 | old_len = len; | |
1078 | /* right align */ | |
1079 | while (len++ < width) | |
1080 | FcStrBufChar (buf, ' '); | |
1081 | if (buf->failed) | |
1082 | return FcFalse; | |
1083 | len = old_len; | |
1084 | memmove (buf->buf + buf->len - len, | |
1085 | buf->buf + buf->len - width, | |
1086 | len); | |
1087 | memset (buf->buf + buf->len - width, | |
1088 | ' ', | |
1089 | width - len); | |
1090 | } | |
1091 | ||
1092 | return !buf->failed; | |
1093 | } | |
1094 | static FcBool | |
1095 | interpret_percent (FcFormatContext *c, | |
1096 | FcPattern *pat, | |
1097 | FcStrBuf *buf) | |
1098 | { | |
1099 | int width, start; | |
1100 | FcBool ret; | |
1101 | ||
1102 | if (!expect_char (c, '%')) | |
1103 | return FcFalse; | |
1104 | ||
1105 | if (consume_char (c, '%')) /* "%%" */ | |
1106 | { | |
1107 | FcStrBufChar (buf, '%'); | |
1108 | return FcTrue; | |
1109 | } | |
1110 | ||
1111 | /* parse an optional width specifier */ | |
1112 | width = strtol ((const char *) c->format, (char **) &c->format, 10); | |
1113 | ||
1114 | if (!expect_char (c, '{')) | |
1115 | return FcFalse; | |
1116 | ||
1117 | start = buf->len; | |
1118 | ||
1119 | switch (*c->format) { | |
1120 | case '=': ret = interpret_builtin (c, pat, buf); break; | |
1121 | case '{': ret = interpret_subexpr (c, pat, buf); break; | |
1122 | case '+': ret = interpret_filter_in (c, pat, buf); break; | |
1123 | case '-': ret = interpret_filter_out (c, pat, buf); break; | |
1124 | case '?': ret = interpret_cond (c, pat, buf); break; | |
1125 | case '#': ret = interpret_count (c, pat, buf); break; | |
1126 | case '[': ret = interpret_enumerate (c, pat, buf); break; | |
1127 | default: ret = interpret_simple (c, pat, buf); break; | |
1128 | } | |
1129 | ||
1130 | return ret && | |
1131 | maybe_interpret_converts (c, buf, start) && | |
1132 | align_to_width (buf, start, width) && | |
1133 | expect_char (c, '}'); | |
1134 | } | |
1135 | ||
1136 | static FcBool | |
1137 | interpret_expr (FcFormatContext *c, | |
1138 | FcPattern *pat, | |
1139 | FcStrBuf *buf, | |
1140 | FcChar8 term) | |
1141 | { | |
1142 | while (*c->format && *c->format != term) | |
1143 | { | |
1144 | switch (*c->format) | |
1145 | { | |
1146 | case '\\': | |
1147 | c->format++; /* skip over '\\' */ | |
1148 | if (*c->format) | |
1149 | FcStrBufChar (buf, escaped_char (*c->format++)); | |
1150 | continue; | |
1151 | case '%': | |
1152 | if (!interpret_percent (c, pat, buf)) | |
1153 | return FcFalse; | |
1154 | continue; | |
1155 | } | |
1156 | FcStrBufChar (buf, *c->format++); | |
1157 | } | |
1158 | return FcTrue; | |
1159 | } | |
1160 | ||
1161 | static FcBool | |
1162 | FcPatternFormatToBuf (FcPattern *pat, | |
1163 | const FcChar8 *format, | |
1164 | FcStrBuf *buf) | |
1165 | { | |
1166 | FcFormatContext c; | |
1167 | FcChar8 word_static[1024]; | |
1168 | FcBool ret; | |
1169 | ||
1170 | if (!FcFormatContextInit (&c, format, word_static, sizeof (word_static))) | |
1171 | return FcFalse; | |
1172 | ||
1173 | ret = interpret_expr (&c, pat, buf, '\0'); | |
1174 | ||
1175 | FcFormatContextDone (&c); | |
1176 | ||
1177 | return ret; | |
1178 | } | |
1179 | ||
1180 | FcChar8 * | |
1181 | FcPatternFormat (FcPattern *pat, | |
1182 | const FcChar8 *format) | |
1183 | { | |
1184 | FcStrBuf buf; | |
1185 | FcChar8 buf_static[8192 - 1024]; | |
1186 | FcBool ret; | |
1187 | ||
1188 | FcStrBufInit (&buf, buf_static, sizeof (buf_static)); | |
1189 | ||
1190 | ret = FcPatternFormatToBuf (pat, format, &buf); | |
1191 | ||
1192 | if (ret) | |
1193 | return FcStrBufDone (&buf); | |
1194 | else | |
1195 | { | |
1196 | FcStrBufDestroy (&buf); | |
1197 | return NULL; | |
1198 | } | |
1199 | } | |
1200 | ||
1201 | #define __fcformat__ | |
1202 | #include "fcaliastail.h" | |
1203 | #undef __fcformat__ |