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[mandoc.git] / term.c
1 /* $Id: term.c,v 1.201 2011/09/21 09:57:13 schwarze Exp $ */
2 /*
3 * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
4 * Copyright (c) 2010, 2011 Ingo Schwarze <schwarze@openbsd.org>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18 #ifdef HAVE_CONFIG_H
19 #include "config.h"
20 #endif
21
22 #include <sys/types.h>
23
24 #include <assert.h>
25 #include <ctype.h>
26 #include <stdint.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30
31 #include "mandoc.h"
32 #include "out.h"
33 #include "term.h"
34 #include "main.h"
35
36 static void adjbuf(struct termp *p, int);
37 static void bufferc(struct termp *, char);
38 static void encode(struct termp *, const char *, size_t);
39 static void encode1(struct termp *, int);
40
41 void
42 term_free(struct termp *p)
43 {
44
45 if (p->buf)
46 free(p->buf);
47 if (p->symtab)
48 mchars_free(p->symtab);
49
50 free(p);
51 }
52
53
54 void
55 term_begin(struct termp *p, term_margin head,
56 term_margin foot, const void *arg)
57 {
58
59 p->headf = head;
60 p->footf = foot;
61 p->argf = arg;
62 (*p->begin)(p);
63 }
64
65
66 void
67 term_end(struct termp *p)
68 {
69
70 (*p->end)(p);
71 }
72
73 /*
74 * Flush a line of text. A "line" is loosely defined as being something
75 * that should be followed by a newline, regardless of whether it's
76 * broken apart by newlines getting there. A line can also be a
77 * fragment of a columnar list (`Bl -tag' or `Bl -column'), which does
78 * not have a trailing newline.
79 *
80 * The following flags may be specified:
81 *
82 * - TERMP_NOBREAK: this is the most important and is used when making
83 * columns. In short: don't print a newline and instead expect the
84 * next call to do the padding up to the start of the next column.
85 *
86 * - TERMP_TWOSPACE: make sure there is room for at least two space
87 * characters of padding. Otherwise, rather break the line.
88 *
89 * - TERMP_DANGLE: don't newline when TERMP_NOBREAK is specified and
90 * the line is overrun, and don't pad-right if it's underrun.
91 *
92 * - TERMP_HANG: like TERMP_DANGLE, but doesn't newline when
93 * overrunning, instead save the position and continue at that point
94 * when the next invocation.
95 *
96 * In-line line breaking:
97 *
98 * If TERMP_NOBREAK is specified and the line overruns the right
99 * margin, it will break and pad-right to the right margin after
100 * writing. If maxrmargin is violated, it will break and continue
101 * writing from the right-margin, which will lead to the above scenario
102 * upon exit. Otherwise, the line will break at the right margin.
103 */
104 void
105 term_flushln(struct termp *p)
106 {
107 int i; /* current input position in p->buf */
108 size_t vis; /* current visual position on output */
109 size_t vbl; /* number of blanks to prepend to output */
110 size_t vend; /* end of word visual position on output */
111 size_t bp; /* visual right border position */
112 size_t dv; /* temporary for visual pos calculations */
113 int j; /* temporary loop index for p->buf */
114 int jhy; /* last hyph before overflow w/r/t j */
115 size_t maxvis; /* output position of visible boundary */
116 size_t mmax; /* used in calculating bp */
117
118 /*
119 * First, establish the maximum columns of "visible" content.
120 * This is usually the difference between the right-margin and
121 * an indentation, but can be, for tagged lists or columns, a
122 * small set of values.
123 */
124 assert (p->rmargin >= p->offset);
125 dv = p->rmargin - p->offset;
126 maxvis = (int)dv > p->overstep ? dv - (size_t)p->overstep : 0;
127 dv = p->maxrmargin - p->offset;
128 mmax = (int)dv > p->overstep ? dv - (size_t)p->overstep : 0;
129
130 bp = TERMP_NOBREAK & p->flags ? mmax : maxvis;
131
132 /*
133 * Calculate the required amount of padding.
134 */
135 vbl = p->offset + p->overstep > p->viscol ?
136 p->offset + p->overstep - p->viscol : 0;
137
138 vis = vend = 0;
139 i = 0;
140
141 while (i < p->col) {
142 /*
143 * Handle literal tab characters: collapse all
144 * subsequent tabs into a single huge set of spaces.
145 */
146 while (i < p->col && '\t' == p->buf[i]) {
147 vend = (vis / p->tabwidth + 1) * p->tabwidth;
148 vbl += vend - vis;
149 vis = vend;
150 i++;
151 }
152
153 /*
154 * Count up visible word characters. Control sequences
155 * (starting with the CSI) aren't counted. A space
156 * generates a non-printing word, which is valid (the
157 * space is printed according to regular spacing rules).
158 */
159
160 for (j = i, jhy = 0; j < p->col; j++) {
161 if ((j && ' ' == p->buf[j]) || '\t' == p->buf[j])
162 break;
163
164 /* Back over the the last printed character. */
165 if (8 == p->buf[j]) {
166 assert(j);
167 vend -= (*p->width)(p, p->buf[j - 1]);
168 continue;
169 }
170
171 /* Regular word. */
172 /* Break at the hyphen point if we overrun. */
173 if (vend > vis && vend < bp &&
174 ASCII_HYPH == p->buf[j])
175 jhy = j;
176
177 vend += (*p->width)(p, p->buf[j]);
178 }
179
180 /*
181 * Find out whether we would exceed the right margin.
182 * If so, break to the next line.
183 */
184 if (vend > bp && 0 == jhy && vis > 0) {
185 vend -= vis;
186 (*p->endline)(p);
187 p->viscol = 0;
188 if (TERMP_NOBREAK & p->flags) {
189 vbl = p->rmargin;
190 vend += p->rmargin - p->offset;
191 } else
192 vbl = p->offset;
193
194 /* Remove the p->overstep width. */
195
196 bp += (size_t)p->overstep;
197 p->overstep = 0;
198 }
199
200 /* Write out the [remaining] word. */
201 for ( ; i < p->col; i++) {
202 if (vend > bp && jhy > 0 && i > jhy)
203 break;
204 if ('\t' == p->buf[i])
205 break;
206 if (' ' == p->buf[i]) {
207 j = i;
208 while (' ' == p->buf[i])
209 i++;
210 dv = (size_t)(i - j) * (*p->width)(p, ' ');
211 vbl += dv;
212 vend += dv;
213 break;
214 }
215 if (ASCII_NBRSP == p->buf[i]) {
216 vbl += (*p->width)(p, ' ');
217 continue;
218 }
219
220 /*
221 * Now we definitely know there will be
222 * printable characters to output,
223 * so write preceding white space now.
224 */
225 if (vbl) {
226 (*p->advance)(p, vbl);
227 p->viscol += vbl;
228 vbl = 0;
229 }
230
231 if (ASCII_HYPH == p->buf[i]) {
232 (*p->letter)(p, '-');
233 p->viscol += (*p->width)(p, '-');
234 continue;
235 }
236
237 (*p->letter)(p, p->buf[i]);
238 if (8 == p->buf[i])
239 p->viscol -= (*p->width)(p, p->buf[i-1]);
240 else
241 p->viscol += (*p->width)(p, p->buf[i]);
242 }
243 vis = vend;
244 }
245
246 /*
247 * If there was trailing white space, it was not printed;
248 * so reset the cursor position accordingly.
249 */
250 if (vis)
251 vis -= vbl;
252
253 p->col = 0;
254 p->overstep = 0;
255
256 if ( ! (TERMP_NOBREAK & p->flags)) {
257 p->viscol = 0;
258 (*p->endline)(p);
259 return;
260 }
261
262 if (TERMP_HANG & p->flags) {
263 /* We need one blank after the tag. */
264 p->overstep = (int)(vis - maxvis + (*p->width)(p, ' '));
265
266 /*
267 * Behave exactly the same way as groff:
268 * If we have overstepped the margin, temporarily move
269 * it to the right and flag the rest of the line to be
270 * shorter.
271 * If we landed right at the margin, be happy.
272 * If we are one step before the margin, temporarily
273 * move it one step LEFT and flag the rest of the line
274 * to be longer.
275 */
276 if (p->overstep < -1)
277 p->overstep = 0;
278 return;
279
280 } else if (TERMP_DANGLE & p->flags)
281 return;
282
283 /* If the column was overrun, break the line. */
284 if (maxvis <= vis +
285 ((TERMP_TWOSPACE & p->flags) ? (*p->width)(p, ' ') : 0)) {
286 (*p->endline)(p);
287 p->viscol = 0;
288 }
289 }
290
291
292 /*
293 * A newline only breaks an existing line; it won't assert vertical
294 * space. All data in the output buffer is flushed prior to the newline
295 * assertion.
296 */
297 void
298 term_newln(struct termp *p)
299 {
300
301 p->flags |= TERMP_NOSPACE;
302 if (p->col || p->viscol)
303 term_flushln(p);
304 }
305
306
307 /*
308 * Asserts a vertical space (a full, empty line-break between lines).
309 * Note that if used twice, this will cause two blank spaces and so on.
310 * All data in the output buffer is flushed prior to the newline
311 * assertion.
312 */
313 void
314 term_vspace(struct termp *p)
315 {
316
317 term_newln(p);
318 p->viscol = 0;
319 (*p->endline)(p);
320 }
321
322 void
323 term_fontlast(struct termp *p)
324 {
325 enum termfont f;
326
327 f = p->fontl;
328 p->fontl = p->fontq[p->fonti];
329 p->fontq[p->fonti] = f;
330 }
331
332
333 void
334 term_fontrepl(struct termp *p, enum termfont f)
335 {
336
337 p->fontl = p->fontq[p->fonti];
338 p->fontq[p->fonti] = f;
339 }
340
341
342 void
343 term_fontpush(struct termp *p, enum termfont f)
344 {
345
346 assert(p->fonti + 1 < 10);
347 p->fontl = p->fontq[p->fonti];
348 p->fontq[++p->fonti] = f;
349 }
350
351
352 const void *
353 term_fontq(struct termp *p)
354 {
355
356 return(&p->fontq[p->fonti]);
357 }
358
359
360 enum termfont
361 term_fonttop(struct termp *p)
362 {
363
364 return(p->fontq[p->fonti]);
365 }
366
367
368 void
369 term_fontpopq(struct termp *p, const void *key)
370 {
371
372 while (p->fonti >= 0 && key != &p->fontq[p->fonti])
373 p->fonti--;
374 assert(p->fonti >= 0);
375 }
376
377
378 void
379 term_fontpop(struct termp *p)
380 {
381
382 assert(p->fonti);
383 p->fonti--;
384 }
385
386 /*
387 * Handle pwords, partial words, which may be either a single word or a
388 * phrase that cannot be broken down (such as a literal string). This
389 * handles word styling.
390 */
391 void
392 term_word(struct termp *p, const char *word)
393 {
394 const char *seq, *cp;
395 char c;
396 int sz, uc;
397 size_t ssz;
398 enum mandoc_esc esc;
399
400 if ( ! (TERMP_NOSPACE & p->flags)) {
401 if ( ! (TERMP_KEEP & p->flags)) {
402 if (TERMP_PREKEEP & p->flags)
403 p->flags |= TERMP_KEEP;
404 bufferc(p, ' ');
405 if (TERMP_SENTENCE & p->flags)
406 bufferc(p, ' ');
407 } else
408 bufferc(p, ASCII_NBRSP);
409 }
410
411 if ( ! (p->flags & TERMP_NONOSPACE))
412 p->flags &= ~TERMP_NOSPACE;
413 else
414 p->flags |= TERMP_NOSPACE;
415
416 p->flags &= ~(TERMP_SENTENCE | TERMP_IGNDELIM);
417
418 while ('\0' != *word) {
419 if ((ssz = strcspn(word, "\\")) > 0)
420 encode(p, word, ssz);
421
422 word += (int)ssz;
423 if ('\\' != *word)
424 continue;
425
426 word++;
427 esc = mandoc_escape(&word, &seq, &sz);
428 if (ESCAPE_ERROR == esc)
429 break;
430
431 if (TERMENC_ASCII != p->enc)
432 switch (esc) {
433 case (ESCAPE_UNICODE):
434 uc = mchars_num2uc(seq + 1, sz - 1);
435 if ('\0' == uc)
436 break;
437 encode1(p, uc);
438 continue;
439 case (ESCAPE_SPECIAL):
440 uc = mchars_spec2cp(p->symtab, seq, sz);
441 if (uc <= 0)
442 break;
443 encode1(p, uc);
444 continue;
445 default:
446 break;
447 }
448
449 switch (esc) {
450 case (ESCAPE_UNICODE):
451 encode1(p, '?');
452 break;
453 case (ESCAPE_NUMBERED):
454 c = mchars_num2char(seq, sz);
455 if ('\0' != c)
456 encode(p, &c, 1);
457 break;
458 case (ESCAPE_SPECIAL):
459 cp = mchars_spec2str(p->symtab, seq, sz, &ssz);
460 if (NULL != cp)
461 encode(p, cp, ssz);
462 else if (1 == ssz)
463 encode(p, seq, sz);
464 break;
465 case (ESCAPE_FONTBOLD):
466 term_fontrepl(p, TERMFONT_BOLD);
467 break;
468 case (ESCAPE_FONTITALIC):
469 term_fontrepl(p, TERMFONT_UNDER);
470 break;
471 case (ESCAPE_FONT):
472 /* FALLTHROUGH */
473 case (ESCAPE_FONTROMAN):
474 term_fontrepl(p, TERMFONT_NONE);
475 break;
476 case (ESCAPE_FONTPREV):
477 term_fontlast(p);
478 break;
479 case (ESCAPE_NOSPACE):
480 if ('\0' == *word)
481 p->flags |= TERMP_NOSPACE;
482 break;
483 default:
484 break;
485 }
486 }
487 }
488
489 static void
490 adjbuf(struct termp *p, int sz)
491 {
492
493 if (0 == p->maxcols)
494 p->maxcols = 1024;
495 while (sz >= p->maxcols)
496 p->maxcols <<= 2;
497
498 p->buf = mandoc_realloc
499 (p->buf, sizeof(int) * (size_t)p->maxcols);
500 }
501
502 static void
503 bufferc(struct termp *p, char c)
504 {
505
506 if (p->col + 1 >= p->maxcols)
507 adjbuf(p, p->col + 1);
508
509 p->buf[p->col++] = c;
510 }
511
512 /*
513 * See encode().
514 * Do this for a single (probably unicode) value.
515 * Does not check for non-decorated glyphs.
516 */
517 static void
518 encode1(struct termp *p, int c)
519 {
520 enum termfont f;
521
522 if (p->col + 4 >= p->maxcols)
523 adjbuf(p, p->col + 4);
524
525 f = term_fonttop(p);
526
527 if (TERMFONT_NONE == f) {
528 p->buf[p->col++] = c;
529 return;
530 } else if (TERMFONT_UNDER == f) {
531 p->buf[p->col++] = '_';
532 } else
533 p->buf[p->col++] = c;
534
535 p->buf[p->col++] = 8;
536 p->buf[p->col++] = c;
537 }
538
539 static void
540 encode(struct termp *p, const char *word, size_t sz)
541 {
542 enum termfont f;
543 int i, len;
544
545 /* LINTED */
546 len = sz;
547
548 /*
549 * Encode and buffer a string of characters. If the current
550 * font mode is unset, buffer directly, else encode then buffer
551 * character by character.
552 */
553
554 if (TERMFONT_NONE == (f = term_fonttop(p))) {
555 if (p->col + len >= p->maxcols)
556 adjbuf(p, p->col + len);
557 for (i = 0; i < len; i++)
558 p->buf[p->col++] = word[i];
559 return;
560 }
561
562 /* Pre-buffer, assuming worst-case. */
563
564 if (p->col + 1 + (len * 3) >= p->maxcols)
565 adjbuf(p, p->col + 1 + (len * 3));
566
567 for (i = 0; i < len; i++) {
568 if (ASCII_HYPH != word[i] &&
569 ! isgraph((unsigned char)word[i])) {
570 p->buf[p->col++] = word[i];
571 continue;
572 }
573
574 if (TERMFONT_UNDER == f)
575 p->buf[p->col++] = '_';
576 else if (ASCII_HYPH == word[i])
577 p->buf[p->col++] = '-';
578 else
579 p->buf[p->col++] = word[i];
580
581 p->buf[p->col++] = 8;
582 p->buf[p->col++] = word[i];
583 }
584 }
585
586 size_t
587 term_len(const struct termp *p, size_t sz)
588 {
589
590 return((*p->width)(p, ' ') * sz);
591 }
592
593
594 size_t
595 term_strlen(const struct termp *p, const char *cp)
596 {
597 size_t sz, rsz, i;
598 int ssz, c;
599 const char *seq, *rhs;
600 enum mandoc_esc esc;
601 static const char rej[] = { '\\', ASCII_HYPH, ASCII_NBRSP, '\0' };
602
603 /*
604 * Account for escaped sequences within string length
605 * calculations. This follows the logic in term_word() as we
606 * must calculate the width of produced strings.
607 */
608
609 sz = 0;
610 while ('\0' != *cp) {
611 rsz = strcspn(cp, rej);
612 for (i = 0; i < rsz; i++)
613 sz += (*p->width)(p, *cp++);
614
615 c = 0;
616 switch (*cp) {
617 case ('\\'):
618 cp++;
619 esc = mandoc_escape(&cp, &seq, &ssz);
620 if (ESCAPE_ERROR == esc)
621 return(sz);
622
623 if (TERMENC_ASCII != p->enc)
624 switch (esc) {
625 case (ESCAPE_UNICODE):
626 c = mchars_num2uc
627 (seq + 1, ssz - 1);
628 if ('\0' == c)
629 break;
630 sz += (*p->width)(p, c);
631 continue;
632 case (ESCAPE_SPECIAL):
633 c = mchars_spec2cp
634 (p->symtab, seq, ssz);
635 if (c <= 0)
636 break;
637 sz += (*p->width)(p, c);
638 continue;
639 default:
640 break;
641 }
642
643 rhs = NULL;
644
645 switch (esc) {
646 case (ESCAPE_UNICODE):
647 sz += (*p->width)(p, '?');
648 break;
649 case (ESCAPE_NUMBERED):
650 c = mchars_num2char(seq, ssz);
651 if ('\0' != c)
652 sz += (*p->width)(p, c);
653 break;
654 case (ESCAPE_SPECIAL):
655 rhs = mchars_spec2str
656 (p->symtab, seq, ssz, &rsz);
657
658 if (ssz != 1 || rhs)
659 break;
660
661 rhs = seq;
662 rsz = ssz;
663 break;
664 default:
665 break;
666 }
667
668 if (NULL == rhs)
669 break;
670
671 for (i = 0; i < rsz; i++)
672 sz += (*p->width)(p, *rhs++);
673 break;
674 case (ASCII_NBRSP):
675 sz += (*p->width)(p, ' ');
676 cp++;
677 break;
678 case (ASCII_HYPH):
679 sz += (*p->width)(p, '-');
680 cp++;
681 break;
682 default:
683 break;
684 }
685 }
686
687 return(sz);
688 }
689
690 /* ARGSUSED */
691 size_t
692 term_vspan(const struct termp *p, const struct roffsu *su)
693 {
694 double r;
695
696 switch (su->unit) {
697 case (SCALE_CM):
698 r = su->scale * 2;
699 break;
700 case (SCALE_IN):
701 r = su->scale * 6;
702 break;
703 case (SCALE_PC):
704 r = su->scale;
705 break;
706 case (SCALE_PT):
707 r = su->scale / 8;
708 break;
709 case (SCALE_MM):
710 r = su->scale / 1000;
711 break;
712 case (SCALE_VS):
713 r = su->scale;
714 break;
715 default:
716 r = su->scale - 1;
717 break;
718 }
719
720 if (r < 0.0)
721 r = 0.0;
722 return(/* LINTED */(size_t)
723 r);
724 }
725
726 size_t
727 term_hspan(const struct termp *p, const struct roffsu *su)
728 {
729 double v;
730
731 v = ((*p->hspan)(p, su));
732 if (v < 0.0)
733 v = 0.0;
734 return((size_t) /* LINTED */
735 v);
736 }
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