Commit | Line | Data |
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1c1e118c MH |
1 | /* Copyright (c) 1979 Regents of the University of California */ |
2 | #include "ex.h" | |
3 | #include "ex_tty.h" | |
4 | #include "ex_vis.h" | |
5 | ||
6 | /* | |
7 | * Routines to handle structure. | |
8 | * Operations supported are: | |
9 | * ( ) { } [ ] | |
10 | * | |
11 | * These cover: LISP TEXT | |
12 | * ( ) s-exprs sentences | |
13 | * { } list at same paragraphs | |
14 | * [ ] defuns sections | |
15 | * | |
16 | * { and } for C used to attempt to do something with matching {}'s, but | |
17 | * I couldn't find definitions which worked intuitively very well, so I | |
18 | * scrapped this. | |
19 | * | |
20 | * The code here is very hard to understand. | |
21 | */ | |
22 | line *llimit; | |
23 | int (*lf)(); | |
24 | ||
25 | #ifdef LISPCODE | |
26 | int lindent(); | |
27 | #endif | |
28 | ||
29 | bool wasend; | |
30 | ||
31 | /* | |
32 | * Find over structure, repeated count times. | |
33 | * Don't go past line limit. F is the operation to | |
34 | * be performed eventually. If pastatom then the user said {} | |
35 | * rather than (), implying past atoms in a list (or a paragraph | |
36 | * rather than a sentence. | |
37 | */ | |
38 | lfind(pastatom, cnt, f, limit) | |
39 | bool pastatom; | |
40 | int cnt, (*f)(); | |
41 | line *limit; | |
42 | { | |
43 | register int c; | |
44 | register int rc = 0; | |
45 | char save[LBSIZE]; | |
46 | ||
47 | /* | |
48 | * Initialize, saving the current line buffer state | |
49 | * and computing the limit; a 0 argument means | |
50 | * directional end of file. | |
51 | */ | |
52 | wasend = 0; | |
53 | lf = f; | |
54 | strcpy(save, linebuf); | |
55 | if (limit == 0) | |
56 | limit = dir < 0 ? one : dol; | |
57 | llimit = limit; | |
58 | wdot = dot; | |
59 | wcursor = cursor; | |
60 | ||
61 | if (pastatom >= 2) { | |
62 | while (cnt > 0 && word(f, cnt)) | |
63 | cnt--; | |
64 | if (pastatom == 3) | |
65 | eend(f); | |
66 | if (dot == wdot) { | |
67 | wdot = 0; | |
68 | if (cursor == wcursor) | |
69 | rc = -1; | |
70 | } | |
71 | } | |
72 | #ifdef LISPCODE | |
73 | else if (!value(LISP)) { | |
74 | #else | |
75 | else { | |
76 | #endif | |
77 | char *icurs; | |
78 | line *idot; | |
79 | ||
80 | if (linebuf[0] == 0) { | |
81 | do | |
82 | if (!lnext()) | |
83 | goto ret; | |
84 | while (linebuf[0] == 0); | |
85 | if (dir > 0) { | |
86 | wdot--; | |
87 | linebuf[0] = 0; | |
88 | wcursor = linebuf; | |
89 | /* | |
90 | * If looking for sentence, next line | |
91 | * starts one. | |
92 | */ | |
93 | if (!pastatom) { | |
94 | icurs = wcursor; | |
95 | idot = wdot; | |
96 | goto begin; | |
97 | } | |
98 | } | |
99 | } | |
100 | icurs = wcursor; | |
101 | idot = wdot; | |
102 | ||
103 | /* | |
104 | * Advance so as to not find same thing again. | |
105 | */ | |
106 | if (dir > 0) { | |
107 | if (!lnext()) { | |
108 | rc = -1; | |
109 | goto ret; | |
110 | } | |
111 | } else | |
112 | ignore(lskipa1("")); | |
113 | ||
114 | /* | |
115 | * Count times find end of sentence/paragraph. | |
116 | */ | |
117 | begin: | |
118 | for (;;) { | |
119 | while (!endsent(pastatom)) | |
120 | if (!lnext()) | |
121 | goto ret; | |
122 | if (!pastatom || wcursor == linebuf && endPS()) | |
123 | if (--cnt <= 0) | |
124 | break; | |
125 | if (linebuf[0] == 0) { | |
126 | do | |
127 | if (!lnext()) | |
128 | goto ret; | |
129 | while (linebuf[0] == 0); | |
130 | } else | |
131 | if (!lnext()) | |
132 | goto ret; | |
133 | } | |
134 | ||
135 | /* | |
136 | * If going backwards, and didn't hit the end of the buffer, | |
137 | * then reverse direction. | |
138 | */ | |
139 | if (dir < 0 && (wdot != llimit || wcursor != linebuf)) { | |
140 | dir = 1; | |
141 | llimit = dot; | |
142 | /* | |
143 | * Empty line needs special treatement. | |
144 | * If moved to it from other than begining of next line, | |
145 | * then a sentence starts on next line. | |
146 | */ | |
147 | if (linebuf[0] == 0 && !pastatom && | |
148 | (wdot != dot - 1 || cursor != linebuf)) { | |
149 | lnext(); | |
150 | goto ret; | |
151 | } | |
152 | } | |
153 | ||
154 | /* | |
155 | * If we are not at a section/paragraph division, | |
156 | * advance to next. | |
157 | */ | |
158 | if (wcursor == icurs && wdot == idot || wcursor != linebuf || !endPS()) | |
159 | ignore(lskipa1("")); | |
160 | } | |
161 | #ifdef LISPCODE | |
162 | else { | |
163 | c = *wcursor; | |
164 | /* | |
165 | * Startup by skipping if at a ( going left or a ) going | |
166 | * right to keep from getting stuck immediately. | |
167 | */ | |
168 | if (dir < 0 && c == '(' || dir > 0 && c == ')') { | |
169 | if (!lnext()) { | |
170 | rc = -1; | |
171 | goto ret; | |
172 | } | |
173 | } | |
174 | /* | |
175 | * Now chew up repitition count. Each time around | |
176 | * if at the beginning of an s-exp (going forwards) | |
177 | * or the end of an s-exp (going backwards) | |
178 | * skip the s-exp. If not at beg/end resp, then stop | |
179 | * if we hit a higher level paren, else skip an atom, | |
180 | * counting it unless pastatom. | |
181 | */ | |
182 | while (cnt > 0) { | |
183 | c = *wcursor; | |
184 | if (dir < 0 && c == ')' || dir > 0 && c == '(') { | |
185 | if (!lskipbal("()")) | |
186 | goto ret; | |
187 | /* | |
188 | * Unless this is the last time going | |
189 | * backwards, skip past the matching paren | |
190 | * so we don't think it is a higher level paren. | |
191 | */ | |
192 | if (dir < 0 && cnt == 1) | |
193 | goto ret; | |
194 | if (!lnext() || !ltosolid()) | |
195 | goto ret; | |
196 | --cnt; | |
197 | } else if (dir < 0 && c == '(' || dir > 0 && c == ')') | |
198 | /* Found a higher level paren */ | |
199 | goto ret; | |
200 | else { | |
201 | if (!lskipatom()) | |
202 | goto ret; | |
203 | if (!pastatom) | |
204 | --cnt; | |
205 | } | |
206 | } | |
207 | } | |
208 | #endif | |
209 | ret: | |
210 | strcLIN(save); | |
211 | return (rc); | |
212 | } | |
213 | ||
214 | /* | |
215 | * Is this the end of a sentence? | |
216 | */ | |
217 | endsent(pastatom) | |
218 | bool pastatom; | |
219 | { | |
220 | register char *cp = wcursor; | |
221 | register int c, d; | |
222 | ||
223 | /* | |
224 | * If this is the beginning of a line, then | |
225 | * check for the end of a paragraph or section. | |
226 | */ | |
227 | if (cp == linebuf) | |
228 | return (endPS()); | |
229 | ||
230 | /* | |
231 | * Sentences end with . ! ? not at the beginning | |
232 | * of the line, and must be either at the end of the line, | |
233 | * or followed by 2 spaces. Any number of intervening ) ] ' " | |
234 | * characters are allowed. | |
235 | */ | |
236 | if (!any(c = *cp, ".!?")) | |
237 | goto tryps; | |
238 | do | |
239 | if ((d = *++cp) == 0) | |
240 | return (1); | |
241 | while (any(d, ")]'")); | |
242 | if (*cp == 0 || *cp++ == ' ' && *cp == ' ') | |
243 | return (1); | |
244 | tryps: | |
245 | if (cp[1] == 0) | |
246 | return (endPS()); | |
247 | return (0); | |
248 | } | |
249 | ||
250 | /* | |
251 | * End of paragraphs/sections are respective | |
252 | * macros as well as blank lines and form feeds. | |
253 | */ | |
254 | endPS() | |
255 | { | |
256 | ||
257 | return (linebuf[0] == 0 || | |
258 | isa(svalue(PARAGRAPHS)) || isa(svalue(SECTIONS))); | |
259 | ||
260 | } | |
261 | ||
262 | #ifdef LISPCODE | |
263 | lindent(addr) | |
264 | line *addr; | |
265 | { | |
266 | register int i; | |
267 | char *swcurs = wcursor; | |
268 | line *swdot = wdot; | |
269 | ||
270 | again: | |
271 | if (addr > one) { | |
272 | register char *cp; | |
273 | register int cnt = 0; | |
274 | ||
275 | addr--; | |
276 | getline(*addr); | |
277 | for (cp = linebuf; *cp; cp++) | |
278 | if (*cp == '(') | |
279 | cnt++; | |
280 | else if (*cp == ')') | |
281 | cnt--; | |
282 | cp = vpastwh(linebuf); | |
283 | if (*cp == 0) | |
284 | goto again; | |
285 | if (cnt == 0) | |
286 | return (whitecnt(linebuf)); | |
287 | addr++; | |
288 | } | |
289 | wcursor = linebuf; | |
290 | linebuf[0] = 0; | |
291 | wdot = addr; | |
292 | dir = -1; | |
293 | llimit = one; | |
294 | lf = lindent; | |
295 | if (!lskipbal("()")) | |
296 | i = 0; | |
297 | else if (wcursor == linebuf) | |
298 | i = 2; | |
299 | else { | |
300 | register char *wp = wcursor; | |
301 | ||
302 | dir = 1; | |
303 | llimit = wdot; | |
304 | if (!lnext() || !ltosolid() || !lskipatom()) { | |
305 | wcursor = wp; | |
306 | i = 1; | |
307 | } else | |
308 | i = 0; | |
309 | i += column(wcursor) - 1; | |
310 | if (!inopen) | |
311 | i--; | |
312 | } | |
313 | wdot = swdot; | |
314 | wcursor = swcurs; | |
315 | return (i); | |
316 | } | |
317 | #endif | |
318 | ||
319 | lmatchp(addr) | |
320 | line *addr; | |
321 | { | |
322 | register int i; | |
323 | register char *parens, *cp; | |
324 | ||
d266c416 | 325 | for (cp = cursor; !any(*cp, "({[)}]");) |
1c1e118c MH |
326 | if (*cp++ == 0) |
327 | return (0); | |
328 | lf = 0; | |
d266c416 | 329 | parens = any(*cp, "()") ? "()" : any(*cp, "[]") ? "[]" : "{}"; |
1c1e118c MH |
330 | if (*cp == parens[1]) { |
331 | dir = -1; | |
332 | llimit = one; | |
333 | } else { | |
334 | dir = 1; | |
335 | llimit = dol; | |
336 | } | |
337 | if (addr) | |
338 | llimit = addr; | |
339 | if (splitw) | |
340 | llimit = dot; | |
341 | wcursor = cp; | |
342 | wdot = dot; | |
343 | i = lskipbal(parens); | |
344 | return (i); | |
345 | } | |
346 | ||
347 | lsmatch(cp) | |
348 | char *cp; | |
349 | { | |
350 | char save[LBSIZE]; | |
351 | register char *sp = save; | |
352 | register char *scurs = cursor; | |
353 | ||
354 | wcursor = cp; | |
355 | strcpy(sp, linebuf); | |
356 | *wcursor = 0; | |
357 | strcpy(cursor, genbuf); | |
358 | cursor = strend(linebuf) - 1; | |
359 | if (lmatchp(dot - vcline)) { | |
360 | register int i = insmode; | |
361 | register int c = outcol; | |
362 | register int l = outline; | |
363 | ||
364 | if (!MI) | |
365 | endim(); | |
366 | vgoto(splitw ? WECHO : LINE(wdot - llimit), column(wcursor) - 1); | |
367 | flush(); | |
368 | sleep(1); | |
369 | vgoto(l, c); | |
370 | if (i) | |
371 | goim(); | |
372 | } | |
d266c416 MH |
373 | else { |
374 | strcLIN(sp); | |
375 | strcpy(scurs, genbuf); | |
376 | if (!lmatchp((line *) 0)) | |
377 | beep(); | |
378 | } | |
1c1e118c MH |
379 | strcLIN(sp); |
380 | wdot = 0; | |
381 | wcursor = 0; | |
382 | cursor = scurs; | |
383 | } | |
384 | ||
385 | ltosolid() | |
386 | { | |
387 | ||
388 | return (ltosol1("()")); | |
389 | } | |
390 | ||
391 | ltosol1(parens) | |
392 | register char *parens; | |
393 | { | |
394 | register char *cp; | |
395 | ||
396 | if (*parens && !*wcursor && !lnext()) | |
397 | return (0); | |
398 | while (isspace(*wcursor) || (*wcursor == 0 && *parens)) | |
399 | if (!lnext()) | |
400 | return (0); | |
401 | if (any(*wcursor, parens) || dir > 0) | |
402 | return (1); | |
403 | for (cp = wcursor; cp > linebuf; cp--) | |
404 | if (isspace(cp[-1]) || any(cp[-1], parens)) | |
405 | break; | |
406 | wcursor = cp; | |
407 | return (1); | |
408 | } | |
409 | ||
410 | lskipbal(parens) | |
411 | register char *parens; | |
412 | { | |
413 | register int level = dir; | |
414 | register int c; | |
415 | ||
416 | do { | |
417 | if (!lnext()) | |
418 | return (0); | |
419 | c = *wcursor; | |
420 | if (c == parens[1]) | |
421 | level--; | |
422 | else if (c == parens[0]) | |
423 | level++; | |
424 | } while (level); | |
425 | return (1); | |
426 | } | |
427 | ||
428 | lskipatom() | |
429 | { | |
430 | ||
431 | return (lskipa1("()")); | |
432 | } | |
433 | ||
434 | lskipa1(parens) | |
435 | register char *parens; | |
436 | { | |
437 | register int c; | |
438 | ||
439 | for (;;) { | |
440 | if (dir < 0 && wcursor == linebuf) { | |
441 | if (!lnext()) | |
442 | return (0); | |
443 | break; | |
444 | } | |
445 | c = *wcursor; | |
446 | if (c && (isspace(c) || any(c, parens))) | |
447 | break; | |
448 | if (!lnext()) | |
449 | return (0); | |
450 | if (dir > 0 && wcursor == linebuf) | |
451 | break; | |
452 | } | |
453 | return (ltosol1(parens)); | |
454 | } | |
455 | ||
456 | lnext() | |
457 | { | |
458 | ||
459 | if (dir > 0) { | |
460 | if (*wcursor) | |
461 | wcursor++; | |
462 | if (*wcursor) | |
463 | return (1); | |
464 | if (wdot >= llimit) { | |
d266c416 | 465 | if (lf == vmove && wcursor > linebuf) |
1c1e118c MH |
466 | wcursor--; |
467 | return (0); | |
468 | } | |
469 | wdot++; | |
470 | getline(*wdot); | |
471 | wcursor = linebuf; | |
472 | return (1); | |
473 | } else { | |
474 | --wcursor; | |
475 | if (wcursor >= linebuf) | |
476 | return (1); | |
477 | #ifdef LISPCODE | |
478 | if (lf == lindent && linebuf[0] == '(') | |
479 | llimit = wdot; | |
480 | #endif | |
481 | if (wdot <= llimit) { | |
482 | wcursor = linebuf; | |
483 | return (0); | |
484 | } | |
485 | wdot--; | |
486 | getline(*wdot); | |
487 | wcursor = linebuf[0] == 0 ? linebuf : strend(linebuf) - 1; | |
488 | return (1); | |
489 | } | |
490 | } | |
491 | ||
492 | lbrack(c, f) | |
493 | register int c; | |
494 | int (*f)(); | |
495 | { | |
496 | register line *addr; | |
497 | ||
498 | addr = dot; | |
499 | for (;;) { | |
500 | addr += dir; | |
501 | if (addr < one || addr > dol) { | |
502 | addr -= dir; | |
503 | break; | |
504 | } | |
505 | getline(*addr); | |
506 | if (linebuf[0] == '{' || | |
507 | #ifdef LISPCODE | |
508 | value(LISP) && linebuf[0] == '(' || | |
509 | #endif | |
510 | isa(svalue(SECTIONS))) { | |
511 | if (c == ']' && f != vmove) { | |
512 | addr--; | |
513 | getline(*addr); | |
514 | } | |
515 | break; | |
516 | } | |
517 | if (c == ']' && f != vmove && linebuf[0] == '}') | |
518 | break; | |
519 | } | |
520 | if (addr == dot) | |
521 | return (0); | |
522 | if (f != vmove) | |
523 | wcursor = c == ']' ? strend(linebuf) : linebuf; | |
524 | else | |
525 | wcursor = 0; | |
526 | wdot = addr; | |
527 | vmoving = 0; | |
528 | return (1); | |
529 | } | |
530 | ||
531 | isa(cp) | |
532 | register char *cp; | |
533 | { | |
534 | ||
535 | if (linebuf[0] != '.') | |
536 | return (0); | |
537 | for (; cp[0] && cp[1]; cp += 2) | |
538 | if (linebuf[1] == cp[0]) { | |
539 | if (linebuf[2] == cp[1]) | |
540 | return (1); | |
541 | if (linebuf[2] == 0 && cp[1] == ' ') | |
542 | return (1); | |
543 | } | |
544 | return (0); | |
545 | } |