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b0322a85 CE |
1 | /* |
2 | ** Copyright 2011 Double Precision, Inc. | |
3 | ** See COPYING for distribution information. | |
4 | ** | |
5 | */ | |
6 | ||
7 | #include "unicode_config.h" | |
8 | #include "unicode.h" | |
9 | ||
10 | #include <unistd.h> | |
11 | #include <stdint.h> | |
12 | #include <stdlib.h> | |
13 | #include <string.h> | |
14 | #include <errno.h> | |
15 | ||
16 | #include "wordbreaktab_internal.h" | |
17 | #include "wordbreaktab.h" | |
18 | ||
19 | struct unicode_wb_info { | |
20 | int (*cb_func)(int, void *); | |
21 | void *cb_arg; | |
22 | ||
23 | uint8_t prevclass; | |
24 | size_t wb4_cnt; | |
25 | ||
26 | size_t wb4_extra_cnt; | |
27 | ||
28 | int (*next_handler)(unicode_wb_info_t, uint8_t); | |
29 | int (*end_handler)(unicode_wb_info_t); | |
30 | }; | |
31 | ||
32 | static int sot(unicode_wb_info_t i, uint8_t cl); | |
33 | static int wb4(unicode_wb_info_t i); | |
34 | static int wb1and2_done(unicode_wb_info_t i, uint8_t cl); | |
35 | ||
36 | static int seen_wb67_handler(unicode_wb_info_t i, uint8_t cl); | |
37 | static int seen_wb67_end_handler(unicode_wb_info_t i); | |
38 | static int wb67_done(unicode_wb_info_t i, uint8_t prevclass, uint8_t cl); | |
39 | ||
40 | static int seen_wb1112_handler(unicode_wb_info_t i, uint8_t cl); | |
41 | static int seen_wb1112_end_handler(unicode_wb_info_t i); | |
42 | static int wb1112_done(unicode_wb_info_t i, uint8_t prevclass, uint8_t cl); | |
43 | ||
44 | unicode_wb_info_t unicode_wb_init(int (*cb_func)(int, void *), | |
45 | void *cb_arg) | |
46 | { | |
47 | unicode_wb_info_t i=calloc(1, sizeof(struct unicode_wb_info)); | |
48 | ||
49 | if (!i) | |
50 | return NULL; | |
51 | ||
52 | i->next_handler=sot; | |
53 | i->cb_func=cb_func; | |
54 | i->cb_arg=cb_arg; | |
55 | return i; | |
56 | } | |
57 | ||
58 | int unicode_wb_end(unicode_wb_info_t i) | |
59 | { | |
60 | int rc; | |
61 | ||
62 | if (i->end_handler) | |
63 | rc=(*i->end_handler)(i); | |
64 | else | |
65 | rc=wb4(i); | |
66 | ||
67 | free(i); | |
68 | return rc; | |
69 | } | |
70 | ||
71 | int unicode_wb_next_cnt(unicode_wb_info_t i, | |
72 | const unicode_char *chars, | |
73 | size_t cnt) | |
74 | { | |
75 | int rc; | |
76 | ||
77 | while (cnt) | |
78 | { | |
79 | rc=unicode_wb_next(i, *chars++); | |
80 | --cnt; | |
81 | if (rc) | |
82 | return rc; | |
83 | } | |
84 | return 0; | |
85 | } | |
86 | ||
87 | int unicode_wb_next(unicode_wb_info_t i, unicode_char ch) | |
88 | { | |
89 | return (*i->next_handler) | |
90 | (i, unicode_tab_lookup(ch, | |
91 | unicode_indextab, | |
92 | sizeof(unicode_indextab) | |
93 | / sizeof(unicode_indextab[0]), | |
94 | unicode_rangetab, | |
95 | unicode_classtab, | |
96 | UNICODE_WB_OTHER)); | |
97 | } | |
98 | ||
99 | static int wb4(unicode_wb_info_t i) | |
100 | { | |
101 | int rc=0; | |
102 | ||
103 | while (i->wb4_cnt > 0) | |
104 | { | |
105 | --i->wb4_cnt; | |
106 | ||
107 | if (rc == 0) | |
108 | rc=(*i->cb_func)(0, i->cb_arg); | |
109 | } | |
110 | return rc; | |
111 | } | |
112 | ||
113 | static int result(unicode_wb_info_t i, int flag) | |
114 | { | |
115 | int rc=wb4(i); | |
116 | ||
117 | if (rc == 0) | |
118 | rc=(*i->cb_func)(flag, i->cb_arg); | |
119 | ||
120 | return rc; | |
121 | } | |
122 | ||
123 | #define SET_HANDLER(next,end) (i->next_handler=next, i->end_handler=end) | |
124 | ||
125 | static int sot(unicode_wb_info_t i, uint8_t cl) | |
126 | { | |
127 | i->prevclass=cl; | |
128 | SET_HANDLER(wb1and2_done, NULL); | |
129 | ||
130 | return result(i, 1); /* WB1 */ | |
131 | } | |
132 | ||
133 | static int wb1and2_done(unicode_wb_info_t i, uint8_t cl) | |
134 | { | |
135 | uint8_t prevclass=i->prevclass; | |
136 | ||
137 | i->prevclass=cl; | |
138 | ||
139 | if (prevclass == UNICODE_WB_CR && cl == UNICODE_WB_LF) | |
140 | return result(i, 0); /* WB3 */ | |
141 | ||
142 | switch (prevclass) { | |
143 | case UNICODE_WB_CR: | |
144 | case UNICODE_WB_LF: | |
145 | case UNICODE_WB_Newline: | |
146 | return result(i, 1); /* WB3a */ | |
147 | } | |
148 | ||
149 | switch (cl) { | |
150 | case UNICODE_WB_CR: | |
151 | case UNICODE_WB_LF: | |
152 | case UNICODE_WB_Newline: | |
153 | return result(i, 1); /* WB3b */ | |
154 | } | |
155 | ||
156 | if (cl == UNICODE_WB_Extend || cl == UNICODE_WB_Format) | |
157 | { | |
158 | i->prevclass=prevclass; | |
159 | ++i->wb4_cnt; | |
160 | return 0; /* WB4 */ | |
161 | } | |
162 | ||
163 | if (prevclass == UNICODE_WB_ALetter && cl == UNICODE_WB_ALetter) | |
164 | { | |
165 | return result(i, 0); /* WB5 */ | |
166 | } | |
167 | ||
168 | if (prevclass == UNICODE_WB_ALetter && | |
169 | (cl == UNICODE_WB_MidLetter || cl == UNICODE_WB_MidNumLet)) | |
170 | { | |
171 | i->wb4_extra_cnt=0; | |
172 | SET_HANDLER(seen_wb67_handler, seen_wb67_end_handler); | |
173 | return 0; | |
174 | } | |
175 | ||
176 | return wb67_done(i, prevclass, cl); | |
177 | } | |
178 | ||
179 | /* | |
180 | ** ALetter (MidLetter | MidNumLet ) ? | |
181 | ** | |
182 | ** prevclass cl | |
183 | ** | |
184 | ** Seen ALetter (MidLetter | MidNumLet), with the second character's status | |
185 | ** not returned yet. | |
186 | */ | |
187 | ||
188 | static int seen_wb67_handler(unicode_wb_info_t i, uint8_t cl) | |
189 | { | |
190 | int rc; | |
191 | uint8_t prevclass; | |
192 | size_t extra_cnt; | |
193 | ||
194 | if (cl == UNICODE_WB_Extend || cl == UNICODE_WB_Format) | |
195 | { | |
196 | ++i->wb4_extra_cnt; | |
197 | return 0; | |
198 | } | |
199 | ||
200 | extra_cnt=i->wb4_extra_cnt; | |
201 | ||
202 | /* | |
203 | ** Reset the handler to the default, then check WB6 | |
204 | */ | |
205 | ||
206 | SET_HANDLER(wb1and2_done, NULL); | |
207 | ||
208 | if (cl == UNICODE_WB_ALetter) | |
209 | { | |
210 | rc=result(i, 0); /* WB6 */ | |
211 | i->wb4_cnt=extra_cnt; | |
212 | ||
213 | if (rc == 0) | |
214 | rc=result(i, 0); /* WB7 */ | |
215 | ||
216 | i->prevclass=cl; | |
217 | ||
218 | return rc; | |
219 | } | |
220 | ||
221 | prevclass=i->prevclass; /* This was the second character */ | |
222 | ||
223 | /* | |
224 | ** Process the second character, starting with WB7 | |
225 | */ | |
226 | ||
227 | rc=wb67_done(i, UNICODE_WB_ALetter, prevclass); | |
228 | ||
229 | i->prevclass=prevclass; | |
230 | i->wb4_cnt=extra_cnt; | |
231 | ||
232 | if (rc == 0) | |
233 | rc=(*i->next_handler)(i, cl); | |
234 | /* Process the current char now */ | |
235 | ||
236 | return rc; | |
237 | } | |
238 | ||
239 | /* | |
240 | ** Seen ALetter (MidLetter | MidNumLet), with the second character's status | |
241 | ** not returned yet, and now sot. | |
242 | */ | |
243 | ||
244 | static int seen_wb67_end_handler(unicode_wb_info_t i) | |
245 | { | |
246 | int rc; | |
247 | size_t extra_cnt=i->wb4_extra_cnt; | |
248 | ||
249 | /* | |
250 | ** Process the second character, starting with WB7. | |
251 | */ | |
252 | ||
253 | rc=wb67_done(i, UNICODE_WB_ALetter, i->prevclass); | |
254 | i->wb4_cnt=extra_cnt; | |
255 | if (rc == 0) | |
256 | rc=wb4(i); | |
257 | return rc; | |
258 | } | |
259 | ||
260 | ||
261 | static int wb67_done(unicode_wb_info_t i, uint8_t prevclass, uint8_t cl) | |
262 | { | |
263 | if (prevclass == UNICODE_WB_Numeric && cl == UNICODE_WB_Numeric) | |
264 | return result(i, 0); /* WB8 */ | |
265 | ||
266 | if (prevclass == UNICODE_WB_ALetter && cl == UNICODE_WB_Numeric) | |
267 | return result(i, 0); /* WB9 */ | |
268 | ||
269 | if (prevclass == UNICODE_WB_Numeric && cl == UNICODE_WB_ALetter) | |
270 | return result(i, 0); /* WB10 */ | |
271 | ||
272 | ||
273 | if (prevclass == UNICODE_WB_Numeric && | |
274 | (cl == UNICODE_WB_MidNum || cl == UNICODE_WB_MidNumLet)) | |
275 | { | |
276 | i->wb4_extra_cnt=0; | |
277 | SET_HANDLER(seen_wb1112_handler, seen_wb1112_end_handler); | |
278 | return 0; | |
279 | } | |
280 | ||
281 | return wb1112_done(i, prevclass, cl); | |
282 | } | |
283 | ||
284 | /* | |
285 | ** Numeric (MidNum | MidNumLet ) ? | |
286 | ** | |
287 | ** prevclass cl | |
288 | ** | |
289 | ** Seen Numeric (MidNum | MidNumLet), with the second character's status | |
290 | ** not returned yet. | |
291 | */ | |
292 | ||
293 | static int seen_wb1112_handler(unicode_wb_info_t i, uint8_t cl) | |
294 | { | |
295 | int rc; | |
296 | uint8_t prevclass; | |
297 | size_t extra_cnt; | |
298 | ||
299 | if (cl == UNICODE_WB_Extend || cl == UNICODE_WB_Format) | |
300 | { | |
301 | ++i->wb4_extra_cnt; | |
302 | return 0; | |
303 | } | |
304 | ||
305 | extra_cnt=i->wb4_extra_cnt; | |
306 | ||
307 | /* | |
308 | ** Reset the handler to the default, then check WB6 | |
309 | */ | |
310 | ||
311 | SET_HANDLER(wb1and2_done, NULL); | |
312 | ||
313 | if (cl == UNICODE_WB_Numeric) | |
314 | { | |
315 | rc=result(i, 0); /* WB11 */ | |
316 | i->wb4_cnt=extra_cnt; | |
317 | ||
318 | if (rc == 0) | |
319 | rc=result(i, 0); /* WB12 */ | |
320 | ||
321 | i->prevclass=cl; | |
322 | ||
323 | return rc; | |
324 | } | |
325 | ||
326 | prevclass=i->prevclass; /* This was the second character */ | |
327 | ||
328 | /* | |
329 | ** Process the second character, starting with WB7 | |
330 | */ | |
331 | ||
332 | rc=wb1112_done(i, UNICODE_WB_Numeric, prevclass); | |
333 | ||
334 | i->prevclass=prevclass; | |
335 | i->wb4_cnt=extra_cnt; | |
336 | ||
337 | if (rc == 0) | |
338 | rc=(*i->next_handler)(i, cl); | |
339 | /* Process the current char now */ | |
340 | ||
341 | return rc; | |
342 | } | |
343 | ||
344 | /* | |
345 | ** Seen Numeric (MidNum | MidNumLet), with the second character's status | |
346 | ** not returned yet, and now sot. | |
347 | */ | |
348 | ||
349 | static int seen_wb1112_end_handler(unicode_wb_info_t i) | |
350 | { | |
351 | int rc; | |
352 | size_t extra_cnt=i->wb4_extra_cnt; | |
353 | ||
354 | /* | |
355 | ** Process the second character, starting with WB11. | |
356 | */ | |
357 | ||
358 | rc=wb1112_done(i, UNICODE_WB_Numeric, i->prevclass); | |
359 | i->wb4_cnt=extra_cnt; | |
360 | if (rc == 0) | |
361 | rc=wb4(i); | |
362 | return rc; | |
363 | } | |
364 | ||
365 | static int wb1112_done(unicode_wb_info_t i, uint8_t prevclass, uint8_t cl) | |
366 | { | |
367 | if (prevclass == UNICODE_WB_Katakana && | |
368 | cl == UNICODE_WB_Katakana) | |
369 | return result(i, 0); /* WB13 */ | |
370 | ||
371 | switch (prevclass) { | |
372 | case UNICODE_WB_ALetter: | |
373 | case UNICODE_WB_Numeric: | |
374 | case UNICODE_WB_Katakana: | |
375 | case UNICODE_WB_ExtendNumLet: | |
376 | if (cl == UNICODE_WB_ExtendNumLet) | |
377 | return result(i, 0); /* WB13a */ | |
378 | } | |
379 | ||
380 | if (prevclass == UNICODE_WB_ExtendNumLet) | |
381 | switch (cl) { | |
382 | case UNICODE_WB_ALetter: | |
383 | case UNICODE_WB_Numeric: | |
384 | case UNICODE_WB_Katakana: | |
385 | return result(i, 0); /* WB13b */ | |
386 | } | |
387 | ||
388 | return result(i, 1); /* WB14 */ | |
389 | } | |
390 | ||
391 | /* --------------------------------------------------------------------- */ | |
392 | ||
393 | struct unicode_wbscan_info { | |
394 | unicode_wb_info_t wb_handle; | |
395 | ||
396 | int found; | |
397 | size_t cnt; | |
398 | }; | |
399 | ||
400 | static int unicode_wbscan_callback(int, void *); | |
401 | ||
402 | unicode_wbscan_info_t unicode_wbscan_init() | |
403 | { | |
404 | unicode_wbscan_info_t i=calloc(1, sizeof(struct unicode_wbscan_info)); | |
405 | ||
406 | if (!i) | |
407 | return NULL; | |
408 | ||
409 | if ((i->wb_handle=unicode_wb_init(unicode_wbscan_callback, i)) == NULL) | |
410 | { | |
411 | free(i); | |
412 | return NULL; | |
413 | } | |
414 | ||
415 | return i; | |
416 | } | |
417 | ||
418 | int unicode_wbscan_next(unicode_wbscan_info_t i, unicode_char ch) | |
419 | { | |
420 | if (!i->found) | |
421 | unicode_wb_next(i->wb_handle, ch); | |
422 | ||
423 | return i->found; | |
424 | } | |
425 | ||
426 | size_t unicode_wbscan_end(unicode_wbscan_info_t i) | |
427 | { | |
428 | size_t n; | |
429 | ||
430 | unicode_wb_end(i->wb_handle); | |
431 | ||
432 | n=i->cnt; | |
433 | free(i); | |
434 | return n; | |
435 | } | |
436 | ||
437 | static int unicode_wbscan_callback(int flag, void *arg) | |
438 | { | |
439 | unicode_wbscan_info_t i=(unicode_wbscan_info_t)arg; | |
440 | ||
441 | if (flag && i->cnt > 0) | |
442 | i->found=1; | |
443 | ||
444 | if (!i->found) | |
445 | ++i->cnt; | |
446 | return 0; | |
447 | } | |
448 |