Commit | Line | Data |
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f9679f70 DF |
1 | /* |
2 | * Copyright (c) 1980 Regents of the University of California. | |
3 | * All rights reserved. The Berkeley software License Agreement | |
4 | * specifies the terms and conditions for redistribution. | |
5 | */ | |
6 | ||
7 | #ifndef lint | |
70190965 | 8 | static char *sccsid = "@(#)ex_vops3.c 7.3 (Berkeley) %G%"; |
f9679f70 DF |
9 | #endif not lint |
10 | ||
1c1e118c MH |
11 | #include "ex.h" |
12 | #include "ex_tty.h" | |
13 | #include "ex_vis.h" | |
14 | ||
15 | /* | |
16 | * Routines to handle structure. | |
17 | * Operations supported are: | |
18 | * ( ) { } [ ] | |
19 | * | |
20 | * These cover: LISP TEXT | |
21 | * ( ) s-exprs sentences | |
22 | * { } list at same paragraphs | |
23 | * [ ] defuns sections | |
24 | * | |
25 | * { and } for C used to attempt to do something with matching {}'s, but | |
26 | * I couldn't find definitions which worked intuitively very well, so I | |
27 | * scrapped this. | |
28 | * | |
29 | * The code here is very hard to understand. | |
30 | */ | |
31 | line *llimit; | |
32 | int (*lf)(); | |
33 | ||
34 | #ifdef LISPCODE | |
35 | int lindent(); | |
36 | #endif | |
37 | ||
38 | bool wasend; | |
39 | ||
40 | /* | |
41 | * Find over structure, repeated count times. | |
42 | * Don't go past line limit. F is the operation to | |
43 | * be performed eventually. If pastatom then the user said {} | |
44 | * rather than (), implying past atoms in a list (or a paragraph | |
45 | * rather than a sentence. | |
46 | */ | |
47 | lfind(pastatom, cnt, f, limit) | |
48 | bool pastatom; | |
49 | int cnt, (*f)(); | |
50 | line *limit; | |
51 | { | |
52 | register int c; | |
53 | register int rc = 0; | |
54 | char save[LBSIZE]; | |
55 | ||
56 | /* | |
57 | * Initialize, saving the current line buffer state | |
58 | * and computing the limit; a 0 argument means | |
59 | * directional end of file. | |
60 | */ | |
61 | wasend = 0; | |
62 | lf = f; | |
63 | strcpy(save, linebuf); | |
64 | if (limit == 0) | |
65 | limit = dir < 0 ? one : dol; | |
66 | llimit = limit; | |
67 | wdot = dot; | |
68 | wcursor = cursor; | |
69 | ||
70 | if (pastatom >= 2) { | |
71 | while (cnt > 0 && word(f, cnt)) | |
72 | cnt--; | |
73 | if (pastatom == 3) | |
74 | eend(f); | |
75 | if (dot == wdot) { | |
76 | wdot = 0; | |
77 | if (cursor == wcursor) | |
78 | rc = -1; | |
79 | } | |
80 | } | |
81 | #ifdef LISPCODE | |
82 | else if (!value(LISP)) { | |
83 | #else | |
84 | else { | |
85 | #endif | |
86 | char *icurs; | |
87 | line *idot; | |
88 | ||
89 | if (linebuf[0] == 0) { | |
90 | do | |
91 | if (!lnext()) | |
92 | goto ret; | |
93 | while (linebuf[0] == 0); | |
94 | if (dir > 0) { | |
95 | wdot--; | |
96 | linebuf[0] = 0; | |
97 | wcursor = linebuf; | |
98 | /* | |
99 | * If looking for sentence, next line | |
100 | * starts one. | |
101 | */ | |
102 | if (!pastatom) { | |
103 | icurs = wcursor; | |
104 | idot = wdot; | |
105 | goto begin; | |
106 | } | |
107 | } | |
108 | } | |
109 | icurs = wcursor; | |
110 | idot = wdot; | |
111 | ||
112 | /* | |
113 | * Advance so as to not find same thing again. | |
114 | */ | |
115 | if (dir > 0) { | |
116 | if (!lnext()) { | |
117 | rc = -1; | |
118 | goto ret; | |
119 | } | |
120 | } else | |
121 | ignore(lskipa1("")); | |
122 | ||
123 | /* | |
124 | * Count times find end of sentence/paragraph. | |
125 | */ | |
126 | begin: | |
127 | for (;;) { | |
128 | while (!endsent(pastatom)) | |
129 | if (!lnext()) | |
130 | goto ret; | |
131 | if (!pastatom || wcursor == linebuf && endPS()) | |
132 | if (--cnt <= 0) | |
133 | break; | |
134 | if (linebuf[0] == 0) { | |
135 | do | |
136 | if (!lnext()) | |
137 | goto ret; | |
138 | while (linebuf[0] == 0); | |
139 | } else | |
140 | if (!lnext()) | |
141 | goto ret; | |
142 | } | |
143 | ||
144 | /* | |
145 | * If going backwards, and didn't hit the end of the buffer, | |
146 | * then reverse direction. | |
147 | */ | |
148 | if (dir < 0 && (wdot != llimit || wcursor != linebuf)) { | |
149 | dir = 1; | |
150 | llimit = dot; | |
151 | /* | |
152 | * Empty line needs special treatement. | |
153 | * If moved to it from other than begining of next line, | |
154 | * then a sentence starts on next line. | |
155 | */ | |
156 | if (linebuf[0] == 0 && !pastatom && | |
157 | (wdot != dot - 1 || cursor != linebuf)) { | |
158 | lnext(); | |
159 | goto ret; | |
160 | } | |
161 | } | |
162 | ||
163 | /* | |
164 | * If we are not at a section/paragraph division, | |
165 | * advance to next. | |
166 | */ | |
167 | if (wcursor == icurs && wdot == idot || wcursor != linebuf || !endPS()) | |
168 | ignore(lskipa1("")); | |
169 | } | |
170 | #ifdef LISPCODE | |
171 | else { | |
172 | c = *wcursor; | |
173 | /* | |
174 | * Startup by skipping if at a ( going left or a ) going | |
175 | * right to keep from getting stuck immediately. | |
176 | */ | |
177 | if (dir < 0 && c == '(' || dir > 0 && c == ')') { | |
178 | if (!lnext()) { | |
179 | rc = -1; | |
180 | goto ret; | |
181 | } | |
182 | } | |
183 | /* | |
184 | * Now chew up repitition count. Each time around | |
185 | * if at the beginning of an s-exp (going forwards) | |
186 | * or the end of an s-exp (going backwards) | |
187 | * skip the s-exp. If not at beg/end resp, then stop | |
188 | * if we hit a higher level paren, else skip an atom, | |
189 | * counting it unless pastatom. | |
190 | */ | |
191 | while (cnt > 0) { | |
192 | c = *wcursor; | |
193 | if (dir < 0 && c == ')' || dir > 0 && c == '(') { | |
194 | if (!lskipbal("()")) | |
195 | goto ret; | |
196 | /* | |
197 | * Unless this is the last time going | |
198 | * backwards, skip past the matching paren | |
199 | * so we don't think it is a higher level paren. | |
200 | */ | |
201 | if (dir < 0 && cnt == 1) | |
202 | goto ret; | |
203 | if (!lnext() || !ltosolid()) | |
204 | goto ret; | |
205 | --cnt; | |
206 | } else if (dir < 0 && c == '(' || dir > 0 && c == ')') | |
207 | /* Found a higher level paren */ | |
208 | goto ret; | |
209 | else { | |
210 | if (!lskipatom()) | |
211 | goto ret; | |
212 | if (!pastatom) | |
213 | --cnt; | |
214 | } | |
215 | } | |
216 | } | |
217 | #endif | |
218 | ret: | |
219 | strcLIN(save); | |
220 | return (rc); | |
221 | } | |
222 | ||
223 | /* | |
224 | * Is this the end of a sentence? | |
225 | */ | |
226 | endsent(pastatom) | |
227 | bool pastatom; | |
228 | { | |
229 | register char *cp = wcursor; | |
230 | register int c, d; | |
231 | ||
232 | /* | |
233 | * If this is the beginning of a line, then | |
234 | * check for the end of a paragraph or section. | |
235 | */ | |
236 | if (cp == linebuf) | |
237 | return (endPS()); | |
238 | ||
239 | /* | |
240 | * Sentences end with . ! ? not at the beginning | |
241 | * of the line, and must be either at the end of the line, | |
242 | * or followed by 2 spaces. Any number of intervening ) ] ' " | |
243 | * characters are allowed. | |
244 | */ | |
245 | if (!any(c = *cp, ".!?")) | |
246 | goto tryps; | |
247 | do | |
248 | if ((d = *++cp) == 0) | |
249 | return (1); | |
250 | while (any(d, ")]'")); | |
251 | if (*cp == 0 || *cp++ == ' ' && *cp == ' ') | |
252 | return (1); | |
253 | tryps: | |
254 | if (cp[1] == 0) | |
255 | return (endPS()); | |
256 | return (0); | |
257 | } | |
258 | ||
259 | /* | |
260 | * End of paragraphs/sections are respective | |
261 | * macros as well as blank lines and form feeds. | |
262 | */ | |
263 | endPS() | |
264 | { | |
265 | ||
266 | return (linebuf[0] == 0 || | |
267 | isa(svalue(PARAGRAPHS)) || isa(svalue(SECTIONS))); | |
268 | ||
269 | } | |
270 | ||
271 | #ifdef LISPCODE | |
272 | lindent(addr) | |
273 | line *addr; | |
274 | { | |
275 | register int i; | |
276 | char *swcurs = wcursor; | |
277 | line *swdot = wdot; | |
278 | ||
279 | again: | |
280 | if (addr > one) { | |
281 | register char *cp; | |
282 | register int cnt = 0; | |
283 | ||
284 | addr--; | |
285 | getline(*addr); | |
286 | for (cp = linebuf; *cp; cp++) | |
287 | if (*cp == '(') | |
288 | cnt++; | |
289 | else if (*cp == ')') | |
290 | cnt--; | |
291 | cp = vpastwh(linebuf); | |
292 | if (*cp == 0) | |
293 | goto again; | |
294 | if (cnt == 0) | |
295 | return (whitecnt(linebuf)); | |
296 | addr++; | |
297 | } | |
298 | wcursor = linebuf; | |
299 | linebuf[0] = 0; | |
300 | wdot = addr; | |
301 | dir = -1; | |
302 | llimit = one; | |
303 | lf = lindent; | |
304 | if (!lskipbal("()")) | |
305 | i = 0; | |
306 | else if (wcursor == linebuf) | |
307 | i = 2; | |
308 | else { | |
309 | register char *wp = wcursor; | |
310 | ||
311 | dir = 1; | |
312 | llimit = wdot; | |
313 | if (!lnext() || !ltosolid() || !lskipatom()) { | |
314 | wcursor = wp; | |
315 | i = 1; | |
316 | } else | |
317 | i = 0; | |
318 | i += column(wcursor) - 1; | |
319 | if (!inopen) | |
320 | i--; | |
321 | } | |
322 | wdot = swdot; | |
323 | wcursor = swcurs; | |
324 | return (i); | |
325 | } | |
326 | #endif | |
327 | ||
328 | lmatchp(addr) | |
329 | line *addr; | |
330 | { | |
331 | register int i; | |
332 | register char *parens, *cp; | |
333 | ||
d266c416 | 334 | for (cp = cursor; !any(*cp, "({[)}]");) |
1c1e118c MH |
335 | if (*cp++ == 0) |
336 | return (0); | |
337 | lf = 0; | |
d266c416 | 338 | parens = any(*cp, "()") ? "()" : any(*cp, "[]") ? "[]" : "{}"; |
1c1e118c MH |
339 | if (*cp == parens[1]) { |
340 | dir = -1; | |
341 | llimit = one; | |
342 | } else { | |
343 | dir = 1; | |
344 | llimit = dol; | |
345 | } | |
346 | if (addr) | |
347 | llimit = addr; | |
348 | if (splitw) | |
349 | llimit = dot; | |
350 | wcursor = cp; | |
351 | wdot = dot; | |
352 | i = lskipbal(parens); | |
353 | return (i); | |
354 | } | |
355 | ||
356 | lsmatch(cp) | |
357 | char *cp; | |
358 | { | |
359 | char save[LBSIZE]; | |
360 | register char *sp = save; | |
361 | register char *scurs = cursor; | |
362 | ||
363 | wcursor = cp; | |
364 | strcpy(sp, linebuf); | |
365 | *wcursor = 0; | |
366 | strcpy(cursor, genbuf); | |
367 | cursor = strend(linebuf) - 1; | |
368 | if (lmatchp(dot - vcline)) { | |
369 | register int i = insmode; | |
370 | register int c = outcol; | |
371 | register int l = outline; | |
372 | ||
373 | if (!MI) | |
374 | endim(); | |
375 | vgoto(splitw ? WECHO : LINE(wdot - llimit), column(wcursor) - 1); | |
376 | flush(); | |
377 | sleep(1); | |
378 | vgoto(l, c); | |
379 | if (i) | |
380 | goim(); | |
381 | } | |
d266c416 MH |
382 | else { |
383 | strcLIN(sp); | |
384 | strcpy(scurs, genbuf); | |
385 | if (!lmatchp((line *) 0)) | |
386 | beep(); | |
387 | } | |
1c1e118c MH |
388 | strcLIN(sp); |
389 | wdot = 0; | |
390 | wcursor = 0; | |
391 | cursor = scurs; | |
392 | } | |
393 | ||
394 | ltosolid() | |
395 | { | |
396 | ||
397 | return (ltosol1("()")); | |
398 | } | |
399 | ||
400 | ltosol1(parens) | |
401 | register char *parens; | |
402 | { | |
403 | register char *cp; | |
404 | ||
405 | if (*parens && !*wcursor && !lnext()) | |
406 | return (0); | |
407 | while (isspace(*wcursor) || (*wcursor == 0 && *parens)) | |
408 | if (!lnext()) | |
409 | return (0); | |
410 | if (any(*wcursor, parens) || dir > 0) | |
411 | return (1); | |
412 | for (cp = wcursor; cp > linebuf; cp--) | |
413 | if (isspace(cp[-1]) || any(cp[-1], parens)) | |
414 | break; | |
415 | wcursor = cp; | |
416 | return (1); | |
417 | } | |
418 | ||
419 | lskipbal(parens) | |
420 | register char *parens; | |
421 | { | |
422 | register int level = dir; | |
423 | register int c; | |
424 | ||
425 | do { | |
f0f2d980 MH |
426 | if (!lnext()) { |
427 | wdot = NOLINE; | |
1c1e118c | 428 | return (0); |
f0f2d980 | 429 | } |
1c1e118c MH |
430 | c = *wcursor; |
431 | if (c == parens[1]) | |
432 | level--; | |
433 | else if (c == parens[0]) | |
434 | level++; | |
435 | } while (level); | |
436 | return (1); | |
437 | } | |
438 | ||
439 | lskipatom() | |
440 | { | |
441 | ||
442 | return (lskipa1("()")); | |
443 | } | |
444 | ||
445 | lskipa1(parens) | |
446 | register char *parens; | |
447 | { | |
448 | register int c; | |
449 | ||
450 | for (;;) { | |
451 | if (dir < 0 && wcursor == linebuf) { | |
452 | if (!lnext()) | |
453 | return (0); | |
454 | break; | |
455 | } | |
456 | c = *wcursor; | |
457 | if (c && (isspace(c) || any(c, parens))) | |
458 | break; | |
459 | if (!lnext()) | |
460 | return (0); | |
461 | if (dir > 0 && wcursor == linebuf) | |
462 | break; | |
463 | } | |
464 | return (ltosol1(parens)); | |
465 | } | |
466 | ||
467 | lnext() | |
468 | { | |
469 | ||
470 | if (dir > 0) { | |
471 | if (*wcursor) | |
472 | wcursor++; | |
473 | if (*wcursor) | |
474 | return (1); | |
475 | if (wdot >= llimit) { | |
d266c416 | 476 | if (lf == vmove && wcursor > linebuf) |
1c1e118c MH |
477 | wcursor--; |
478 | return (0); | |
479 | } | |
480 | wdot++; | |
481 | getline(*wdot); | |
482 | wcursor = linebuf; | |
483 | return (1); | |
484 | } else { | |
485 | --wcursor; | |
486 | if (wcursor >= linebuf) | |
487 | return (1); | |
488 | #ifdef LISPCODE | |
489 | if (lf == lindent && linebuf[0] == '(') | |
490 | llimit = wdot; | |
491 | #endif | |
492 | if (wdot <= llimit) { | |
493 | wcursor = linebuf; | |
494 | return (0); | |
495 | } | |
496 | wdot--; | |
497 | getline(*wdot); | |
498 | wcursor = linebuf[0] == 0 ? linebuf : strend(linebuf) - 1; | |
499 | return (1); | |
500 | } | |
501 | } | |
502 | ||
503 | lbrack(c, f) | |
504 | register int c; | |
505 | int (*f)(); | |
506 | { | |
507 | register line *addr; | |
508 | ||
509 | addr = dot; | |
510 | for (;;) { | |
511 | addr += dir; | |
512 | if (addr < one || addr > dol) { | |
513 | addr -= dir; | |
514 | break; | |
515 | } | |
516 | getline(*addr); | |
517 | if (linebuf[0] == '{' || | |
518 | #ifdef LISPCODE | |
519 | value(LISP) && linebuf[0] == '(' || | |
520 | #endif | |
521 | isa(svalue(SECTIONS))) { | |
522 | if (c == ']' && f != vmove) { | |
523 | addr--; | |
524 | getline(*addr); | |
525 | } | |
526 | break; | |
527 | } | |
528 | if (c == ']' && f != vmove && linebuf[0] == '}') | |
529 | break; | |
530 | } | |
531 | if (addr == dot) | |
532 | return (0); | |
533 | if (f != vmove) | |
534 | wcursor = c == ']' ? strend(linebuf) : linebuf; | |
535 | else | |
536 | wcursor = 0; | |
537 | wdot = addr; | |
538 | vmoving = 0; | |
539 | return (1); | |
540 | } | |
541 | ||
542 | isa(cp) | |
543 | register char *cp; | |
544 | { | |
545 | ||
546 | if (linebuf[0] != '.') | |
547 | return (0); | |
548 | for (; cp[0] && cp[1]; cp += 2) | |
549 | if (linebuf[1] == cp[0]) { | |
550 | if (linebuf[2] == cp[1]) | |
551 | return (1); | |
552 | if (linebuf[2] == 0 && cp[1] == ' ') | |
553 | return (1); | |
554 | } | |
555 | return (0); | |
556 | } |