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mandoc: update to 1.14.5
[unleashed.git] / bin / mandoc / html.c
blob1302972a4e13a65bab4314d53bb548c7f4521475
1 /* $Id: html.c,v 1.254 2019/03/03 13:02:11 schwarze Exp $ */
2 /*
3 * Copyright (c) 2008-2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
4 * Copyright (c) 2011-2015, 2017-2019 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 AUTHORS DISCLAIM ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS 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 #include "config.h"
19
20 #include <sys/types.h>
21 #include <sys/stat.h>
22
23 #include <assert.h>
24 #include <ctype.h>
25 #include <stdarg.h>
26 #include <stddef.h>
27 #include <stdio.h>
28 #include <stdint.h>
29 #include <stdlib.h>
30 #include <string.h>
31 #include <unistd.h>
32
33 #include "mandoc_aux.h"
34 #include "mandoc_ohash.h"
35 #include "mandoc.h"
36 #include "roff.h"
37 #include "out.h"
38 #include "html.h"
39 #include "manconf.h"
40 #include "main.h"
41
42 struct htmldata {
43 const char *name;
44 int flags;
45 #define HTML_NOSTACK (1 << 0)
46 #define HTML_AUTOCLOSE (1 << 1)
47 #define HTML_NLBEFORE (1 << 2)
48 #define HTML_NLBEGIN (1 << 3)
49 #define HTML_NLEND (1 << 4)
50 #define HTML_NLAFTER (1 << 5)
51 #define HTML_NLAROUND (HTML_NLBEFORE | HTML_NLAFTER)
52 #define HTML_NLINSIDE (HTML_NLBEGIN | HTML_NLEND)
53 #define HTML_NLALL (HTML_NLAROUND | HTML_NLINSIDE)
54 #define HTML_INDENT (1 << 6)
55 #define HTML_NOINDENT (1 << 7)
56 };
57
58 static const struct htmldata htmltags[TAG_MAX] = {
59 {"html", HTML_NLALL},
60 {"head", HTML_NLALL | HTML_INDENT},
61 {"body", HTML_NLALL},
62 {"meta", HTML_NOSTACK | HTML_AUTOCLOSE | HTML_NLALL},
63 {"title", HTML_NLAROUND},
64 {"div", HTML_NLAROUND},
65 {"div", 0},
66 {"section", HTML_NLALL},
67 {"h1", HTML_NLAROUND},
68 {"h2", HTML_NLAROUND},
69 {"span", 0},
70 {"link", HTML_NOSTACK | HTML_AUTOCLOSE | HTML_NLALL},
71 {"br", HTML_NOSTACK | HTML_AUTOCLOSE | HTML_NLALL},
72 {"a", 0},
73 {"table", HTML_NLALL | HTML_INDENT},
74 {"tr", HTML_NLALL | HTML_INDENT},
75 {"td", HTML_NLAROUND},
76 {"li", HTML_NLAROUND | HTML_INDENT},
77 {"ul", HTML_NLALL | HTML_INDENT},
78 {"ol", HTML_NLALL | HTML_INDENT},
79 {"dl", HTML_NLALL | HTML_INDENT},
80 {"dt", HTML_NLAROUND},
81 {"dd", HTML_NLAROUND | HTML_INDENT},
82 {"p", HTML_NLAROUND | HTML_INDENT},
83 {"pre", HTML_NLALL | HTML_NOINDENT},
84 {"var", 0},
85 {"cite", 0},
86 {"b", 0},
87 {"i", 0},
88 {"code", 0},
89 {"small", 0},
90 {"style", HTML_NLALL | HTML_INDENT},
91 {"math", HTML_NLALL | HTML_INDENT},
92 {"mrow", 0},
93 {"mi", 0},
94 {"mn", 0},
95 {"mo", 0},
96 {"msup", 0},
97 {"msub", 0},
98 {"msubsup", 0},
99 {"mfrac", 0},
100 {"msqrt", 0},
101 {"mfenced", 0},
102 {"mtable", 0},
103 {"mtr", 0},
104 {"mtd", 0},
105 {"munderover", 0},
106 {"munder", 0},
107 {"mover", 0},
108 };
109
110 /* Avoid duplicate HTML id= attributes. */
111 static struct ohash id_unique;
112
113 static void html_reset_internal(struct html *);
114 static void print_byte(struct html *, char);
115 static void print_endword(struct html *);
116 static void print_indent(struct html *);
117 static void print_word(struct html *, const char *);
118
119 static void print_ctag(struct html *, struct tag *);
120 static int print_escape(struct html *, char);
121 static int print_encode(struct html *, const char *, const char *, int);
122 static void print_href(struct html *, const char *, const char *, int);
123
124
125 void *
126 html_alloc(const struct manoutput *outopts)
127 {
128 struct html *h;
129
130 h = mandoc_calloc(1, sizeof(struct html));
131
132 h->tag = NULL;
133 h->style = outopts->style;
134 if ((h->base_man1 = outopts->man) == NULL)
135 h->base_man2 = NULL;
136 else if ((h->base_man2 = strchr(h->base_man1, ';')) != NULL)
137 *h->base_man2++ = '\0';
138 h->base_includes = outopts->includes;
139 if (outopts->fragment)
140 h->oflags |= HTML_FRAGMENT;
141 if (outopts->toc)
142 h->oflags |= HTML_TOC;
143
144 mandoc_ohash_init(&id_unique, 4, 0);
145
146 return h;
147 }
148
149 static void
150 html_reset_internal(struct html *h)
151 {
152 struct tag *tag;
153 char *cp;
154 unsigned int slot;
155
156 while ((tag = h->tag) != NULL) {
157 h->tag = tag->next;
158 free(tag);
159 }
160 cp = ohash_first(&id_unique, &slot);
161 while (cp != NULL) {
162 free(cp);
163 cp = ohash_next(&id_unique, &slot);
164 }
165 ohash_delete(&id_unique);
166 }
167
168 void
169 html_reset(void *p)
170 {
171 html_reset_internal(p);
172 mandoc_ohash_init(&id_unique, 4, 0);
173 }
174
175 void
176 html_free(void *p)
177 {
178 html_reset_internal(p);
179 free(p);
180 }
181
182 void
183 print_gen_head(struct html *h)
184 {
185 struct tag *t;
186
187 print_otag(h, TAG_META, "?", "charset", "utf-8");
188 if (h->style != NULL) {
189 print_otag(h, TAG_LINK, "?h??", "rel", "stylesheet",
190 h->style, "type", "text/css", "media", "all");
191 return;
192 }
193
194 /*
195 * Print a minimal embedded style sheet.
196 */
197
198 t = print_otag(h, TAG_STYLE, "");
199 print_text(h, "table.head, table.foot { width: 100%; }");
200 print_endline(h);
201 print_text(h, "td.head-rtitle, td.foot-os { text-align: right; }");
202 print_endline(h);
203 print_text(h, "td.head-vol { text-align: center; }");
204 print_endline(h);
205 print_text(h, "div.Pp { margin: 1ex 0ex; }");
206 print_endline(h);
207 print_text(h, "div.Nd, div.Bf, div.Op { display: inline; }");
208 print_endline(h);
209 print_text(h, "span.Pa, span.Ad { font-style: italic; }");
210 print_endline(h);
211 print_text(h, "span.Ms { font-weight: bold; }");
212 print_endline(h);
213 print_text(h, "dl.Bl-diag ");
214 print_byte(h, '>');
215 print_text(h, " dt { font-weight: bold; }");
216 print_endline(h);
217 print_text(h, "code.Nm, code.Fl, code.Cm, code.Ic, "
218 "code.In, code.Fd, code.Fn,");
219 print_endline(h);
220 print_text(h, "code.Cd { font-weight: bold; "
221 "font-family: inherit; }");
222 print_tagq(h, t);
223 }
224
225 void
226 print_metaf(struct html *h, enum mandoc_esc deco)
227 {
228 enum htmlfont font;
229
230 switch (deco) {
231 case ESCAPE_FONTPREV:
232 font = h->metal;
233 break;
234 case ESCAPE_FONTITALIC:
235 font = HTMLFONT_ITALIC;
236 break;
237 case ESCAPE_FONTBOLD:
238 font = HTMLFONT_BOLD;
239 break;
240 case ESCAPE_FONTBI:
241 font = HTMLFONT_BI;
242 break;
243 case ESCAPE_FONTCW:
244 font = HTMLFONT_CW;
245 break;
246 case ESCAPE_FONT:
247 case ESCAPE_FONTROMAN:
248 font = HTMLFONT_NONE;
249 break;
250 default:
251 return;
252 }
253
254 if (h->metaf) {
255 print_tagq(h, h->metaf);
256 h->metaf = NULL;
257 }
258
259 h->metal = h->metac;
260 h->metac = font;
261
262 switch (font) {
263 case HTMLFONT_ITALIC:
264 h->metaf = print_otag(h, TAG_I, "");
265 break;
266 case HTMLFONT_BOLD:
267 h->metaf = print_otag(h, TAG_B, "");
268 break;
269 case HTMLFONT_BI:
270 h->metaf = print_otag(h, TAG_B, "");
271 print_otag(h, TAG_I, "");
272 break;
273 case HTMLFONT_CW:
274 h->metaf = print_otag(h, TAG_SPAN, "c", "Li");
275 break;
276 default:
277 break;
278 }
279 }
280
281 void
282 html_close_paragraph(struct html *h)
283 {
284 struct tag *t;
285
286 for (t = h->tag; t != NULL && t->closed == 0; t = t->next) {
287 switch(t->tag) {
288 case TAG_P:
289 case TAG_PRE:
290 print_tagq(h, t);
291 break;
292 case TAG_A:
293 print_tagq(h, t);
294 continue;
295 default:
296 continue;
297 }
298 break;
299 }
300 }
301
302 /*
303 * ROFF_nf switches to no-fill mode, ROFF_fi to fill mode.
304 * TOKEN_NONE does not switch. The old mode is returned.
305 */
306 enum roff_tok
307 html_fillmode(struct html *h, enum roff_tok want)
308 {
309 struct tag *t;
310 enum roff_tok had;
311
312 for (t = h->tag; t != NULL; t = t->next)
313 if (t->tag == TAG_PRE)
314 break;
315
316 had = t == NULL ? ROFF_fi : ROFF_nf;
317
318 if (want != had) {
319 switch (want) {
320 case ROFF_fi:
321 print_tagq(h, t);
322 break;
323 case ROFF_nf:
324 html_close_paragraph(h);
325 print_otag(h, TAG_PRE, "");
326 break;
327 case TOKEN_NONE:
328 break;
329 default:
330 abort();
331 }
332 }
333 return had;
334 }
335
336 char *
337 html_make_id(const struct roff_node *n, int unique)
338 {
339 const struct roff_node *nch;
340 char *buf, *bufs, *cp;
341 unsigned int slot;
342 int suffix;
343
344 for (nch = n->child; nch != NULL; nch = nch->next)
345 if (nch->type != ROFFT_TEXT)
346 return NULL;
347
348 buf = NULL;
349 deroff(&buf, n);
350 if (buf == NULL)
351 return NULL;
352
353 /*
354 * In ID attributes, only use ASCII characters that are
355 * permitted in URL-fragment strings according to the
356 * explicit list at:
357 * https://url.spec.whatwg.org/#url-fragment-string
358 */
359
360 for (cp = buf; *cp != '\0'; cp++)
361 if (isalnum((unsigned char)*cp) == 0 &&
362 strchr("!$&'()*+,-./:;=?@_~", *cp) == NULL)
363 *cp = '_';
364
365 if (unique == 0)
366 return buf;
367
368 /* Avoid duplicate HTML id= attributes. */
369
370 bufs = NULL;
371 suffix = 1;
372 slot = ohash_qlookup(&id_unique, buf);
373 cp = ohash_find(&id_unique, slot);
374 if (cp != NULL) {
375 while (cp != NULL) {
376 free(bufs);
377 if (++suffix > 127) {
378 free(buf);
379 return NULL;
380 }
381 mandoc_asprintf(&bufs, "%s_%d", buf, suffix);
382 slot = ohash_qlookup(&id_unique, bufs);
383 cp = ohash_find(&id_unique, slot);
384 }
385 free(buf);
386 buf = bufs;
387 }
388 ohash_insert(&id_unique, slot, buf);
389 return buf;
390 }
391
392 static int
393 print_escape(struct html *h, char c)
394 {
395
396 switch (c) {
397 case '<':
398 print_word(h, "&lt;");
399 break;
400 case '>':
401 print_word(h, "&gt;");
402 break;
403 case '&':
404 print_word(h, "&amp;");
405 break;
406 case '"':
407 print_word(h, "&quot;");
408 break;
409 case ASCII_NBRSP:
410 print_word(h, "&nbsp;");
411 break;
412 case ASCII_HYPH:
413 print_byte(h, '-');
414 break;
415 case ASCII_BREAK:
416 break;
417 default:
418 return 0;
419 }
420 return 1;
421 }
422
423 static int
424 print_encode(struct html *h, const char *p, const char *pend, int norecurse)
425 {
426 char numbuf[16];
427 const char *seq;
428 size_t sz;
429 int c, len, breakline, nospace;
430 enum mandoc_esc esc;
431 static const char rejs[10] = { ' ', '\\', '<', '>', '&', '"',
432 ASCII_NBRSP, ASCII_HYPH, ASCII_BREAK, '\0' };
433
434 if (pend == NULL)
435 pend = strchr(p, '\0');
436
437 breakline = 0;
438 nospace = 0;
439
440 while (p < pend) {
441 if (HTML_SKIPCHAR & h->flags && '\\' != *p) {
442 h->flags &= ~HTML_SKIPCHAR;
443 p++;
444 continue;
445 }
446
447 for (sz = strcspn(p, rejs); sz-- && p < pend; p++)
448 print_byte(h, *p);
449
450 if (breakline &&
451 (p >= pend || *p == ' ' || *p == ASCII_NBRSP)) {
452 print_otag(h, TAG_BR, "");
453 breakline = 0;
454 while (p < pend && (*p == ' ' || *p == ASCII_NBRSP))
455 p++;
456 continue;
457 }
458
459 if (p >= pend)
460 break;
461
462 if (*p == ' ') {
463 print_endword(h);
464 p++;
465 continue;
466 }
467
468 if (print_escape(h, *p++))
469 continue;
470
471 esc = mandoc_escape(&p, &seq, &len);
472 switch (esc) {
473 case ESCAPE_FONT:
474 case ESCAPE_FONTPREV:
475 case ESCAPE_FONTBOLD:
476 case ESCAPE_FONTITALIC:
477 case ESCAPE_FONTBI:
478 case ESCAPE_FONTCW:
479 case ESCAPE_FONTROMAN:
480 if (0 == norecurse) {
481 h->flags |= HTML_NOSPACE;
482 print_metaf(h, esc);
483 h->flags &= ~HTML_NOSPACE;
484 }
485 continue;
486 case ESCAPE_SKIPCHAR:
487 h->flags |= HTML_SKIPCHAR;
488 continue;
489 case ESCAPE_ERROR:
490 continue;
491 default:
492 break;
493 }
494
495 if (h->flags & HTML_SKIPCHAR) {
496 h->flags &= ~HTML_SKIPCHAR;
497 continue;
498 }
499
500 switch (esc) {
501 case ESCAPE_UNICODE:
502 /* Skip past "u" header. */
503 c = mchars_num2uc(seq + 1, len - 1);
504 break;
505 case ESCAPE_NUMBERED:
506 c = mchars_num2char(seq, len);
507 if (c < 0)
508 continue;
509 break;
510 case ESCAPE_SPECIAL:
511 c = mchars_spec2cp(seq, len);
512 if (c <= 0)
513 continue;
514 break;
515 case ESCAPE_UNDEF:
516 c = *seq;
517 break;
518 case ESCAPE_DEVICE:
519 print_word(h, "html");
520 continue;
521 case ESCAPE_BREAK:
522 breakline = 1;
523 continue;
524 case ESCAPE_NOSPACE:
525 if ('\0' == *p)
526 nospace = 1;
527 continue;
528 case ESCAPE_OVERSTRIKE:
529 if (len == 0)
530 continue;
531 c = seq[len - 1];
532 break;
533 default:
534 continue;
535 }
536 if ((c < 0x20 && c != 0x09) ||
537 (c > 0x7E && c < 0xA0))
538 c = 0xFFFD;
539 if (c > 0x7E) {
540 (void)snprintf(numbuf, sizeof(numbuf), "&#x%.4X;", c);
541 print_word(h, numbuf);
542 } else if (print_escape(h, c) == 0)
543 print_byte(h, c);
544 }
545
546 return nospace;
547 }
548
549 static void
550 print_href(struct html *h, const char *name, const char *sec, int man)
551 {
552 struct stat sb;
553 const char *p, *pp;
554 char *filename;
555
556 if (man) {
557 pp = h->base_man1;
558 if (h->base_man2 != NULL) {
559 mandoc_asprintf(&filename, "%s.%s", name, sec);
560 if (stat(filename, &sb) == -1)
561 pp = h->base_man2;
562 free(filename);
563 }
564 } else
565 pp = h->base_includes;
566
567 while ((p = strchr(pp, '%')) != NULL) {
568 print_encode(h, pp, p, 1);
569 if (man && p[1] == 'S') {
570 if (sec == NULL)
571 print_byte(h, '1');
572 else
573 print_encode(h, sec, NULL, 1);
574 } else if ((man && p[1] == 'N') ||
575 (man == 0 && p[1] == 'I'))
576 print_encode(h, name, NULL, 1);
577 else
578 print_encode(h, p, p + 2, 1);
579 pp = p + 2;
580 }
581 if (*pp != '\0')
582 print_encode(h, pp, NULL, 1);
583 }
584
585 struct tag *
586 print_otag(struct html *h, enum htmltag tag, const char *fmt, ...)
587 {
588 va_list ap;
589 struct tag *t;
590 const char *attr;
591 char *arg1, *arg2;
592 int style_written, tflags;
593
594 tflags = htmltags[tag].flags;
595
596 /* Push this tag onto the stack of open scopes. */
597
598 if ((tflags & HTML_NOSTACK) == 0) {
599 t = mandoc_malloc(sizeof(struct tag));
600 t->tag = tag;
601 t->next = h->tag;
602 t->refcnt = 0;
603 t->closed = 0;
604 h->tag = t;
605 } else
606 t = NULL;
607
608 if (tflags & HTML_NLBEFORE)
609 print_endline(h);
610 if (h->col == 0)
611 print_indent(h);
612 else if ((h->flags & HTML_NOSPACE) == 0) {
613 if (h->flags & HTML_KEEP)
614 print_word(h, "&#x00A0;");
615 else {
616 if (h->flags & HTML_PREKEEP)
617 h->flags |= HTML_KEEP;
618 print_endword(h);
619 }
620 }
621
622 if ( ! (h->flags & HTML_NONOSPACE))
623 h->flags &= ~HTML_NOSPACE;
624 else
625 h->flags |= HTML_NOSPACE;
626
627 /* Print out the tag name and attributes. */
628
629 print_byte(h, '<');
630 print_word(h, htmltags[tag].name);
631
632 va_start(ap, fmt);
633
634 while (*fmt != '\0' && *fmt != 's') {
635
636 /* Parse attributes and arguments. */
637
638 arg1 = va_arg(ap, char *);
639 arg2 = NULL;
640 switch (*fmt++) {
641 case 'c':
642 attr = "class";
643 break;
644 case 'h':
645 attr = "href";
646 break;
647 case 'i':
648 attr = "id";
649 break;
650 case '?':
651 attr = arg1;
652 arg1 = va_arg(ap, char *);
653 break;
654 default:
655 abort();
656 }
657 if (*fmt == 'M')
658 arg2 = va_arg(ap, char *);
659 if (arg1 == NULL)
660 continue;
661
662 /* Print the attributes. */
663
664 print_byte(h, ' ');
665 print_word(h, attr);
666 print_byte(h, '=');
667 print_byte(h, '"');
668 switch (*fmt) {
669 case 'I':
670 print_href(h, arg1, NULL, 0);
671 fmt++;
672 break;
673 case 'M':
674 print_href(h, arg1, arg2, 1);
675 fmt++;
676 break;
677 case 'R':
678 print_byte(h, '#');
679 print_encode(h, arg1, NULL, 1);
680 fmt++;
681 break;
682 default:
683 print_encode(h, arg1, NULL, 1);
684 break;
685 }
686 print_byte(h, '"');
687 }
688
689 style_written = 0;
690 while (*fmt++ == 's') {
691 arg1 = va_arg(ap, char *);
692 arg2 = va_arg(ap, char *);
693 if (arg2 == NULL)
694 continue;
695 print_byte(h, ' ');
696 if (style_written == 0) {
697 print_word(h, "style=\"");
698 style_written = 1;
699 }
700 print_word(h, arg1);
701 print_byte(h, ':');
702 print_byte(h, ' ');
703 print_word(h, arg2);
704 print_byte(h, ';');
705 }
706 if (style_written)
707 print_byte(h, '"');
708
709 va_end(ap);
710
711 /* Accommodate for "well-formed" singleton escaping. */
712
713 if (HTML_AUTOCLOSE & htmltags[tag].flags)
714 print_byte(h, '/');
715
716 print_byte(h, '>');
717
718 if (tflags & HTML_NLBEGIN)
719 print_endline(h);
720 else
721 h->flags |= HTML_NOSPACE;
722
723 if (tflags & HTML_INDENT)
724 h->indent++;
725 if (tflags & HTML_NOINDENT)
726 h->noindent++;
727
728 return t;
729 }
730
731 static void
732 print_ctag(struct html *h, struct tag *tag)
733 {
734 int tflags;
735
736 if (tag->closed == 0) {
737 tag->closed = 1;
738 if (tag == h->metaf)
739 h->metaf = NULL;
740 if (tag == h->tblt)
741 h->tblt = NULL;
742
743 tflags = htmltags[tag->tag].flags;
744 if (tflags & HTML_INDENT)
745 h->indent--;
746 if (tflags & HTML_NOINDENT)
747 h->noindent--;
748 if (tflags & HTML_NLEND)
749 print_endline(h);
750 print_indent(h);
751 print_byte(h, '<');
752 print_byte(h, '/');
753 print_word(h, htmltags[tag->tag].name);
754 print_byte(h, '>');
755 if (tflags & HTML_NLAFTER)
756 print_endline(h);
757 }
758 if (tag->refcnt == 0) {
759 h->tag = tag->next;
760 free(tag);
761 }
762 }
763
764 void
765 print_gen_decls(struct html *h)
766 {
767 print_word(h, "<!DOCTYPE html>");
768 print_endline(h);
769 }
770
771 void
772 print_gen_comment(struct html *h, struct roff_node *n)
773 {
774 int wantblank;
775
776 print_word(h, "<!-- This is an automatically generated file."
777 " Do not edit.");
778 h->indent = 1;
779 wantblank = 0;
780 while (n != NULL && n->type == ROFFT_COMMENT) {
781 if (strstr(n->string, "-->") == NULL &&
782 (wantblank || *n->string != '\0')) {
783 print_endline(h);
784 print_indent(h);
785 print_word(h, n->string);
786 wantblank = *n->string != '\0';
787 }
788 n = n->next;
789 }
790 if (wantblank)
791 print_endline(h);
792 print_word(h, " -->");
793 print_endline(h);
794 h->indent = 0;
795 }
796
797 void
798 print_text(struct html *h, const char *word)
799 {
800 if (h->col && (h->flags & HTML_NOSPACE) == 0) {
801 if ( ! (HTML_KEEP & h->flags)) {
802 if (HTML_PREKEEP & h->flags)
803 h->flags |= HTML_KEEP;
804 print_endword(h);
805 } else
806 print_word(h, "&#x00A0;");
807 }
808
809 assert(NULL == h->metaf);
810 switch (h->metac) {
811 case HTMLFONT_ITALIC:
812 h->metaf = print_otag(h, TAG_I, "");
813 break;
814 case HTMLFONT_BOLD:
815 h->metaf = print_otag(h, TAG_B, "");
816 break;
817 case HTMLFONT_BI:
818 h->metaf = print_otag(h, TAG_B, "");
819 print_otag(h, TAG_I, "");
820 break;
821 case HTMLFONT_CW:
822 h->metaf = print_otag(h, TAG_SPAN, "c", "Li");
823 break;
824 default:
825 print_indent(h);
826 break;
827 }
828
829 assert(word);
830 if ( ! print_encode(h, word, NULL, 0)) {
831 if ( ! (h->flags & HTML_NONOSPACE))
832 h->flags &= ~HTML_NOSPACE;
833 h->flags &= ~HTML_NONEWLINE;
834 } else
835 h->flags |= HTML_NOSPACE | HTML_NONEWLINE;
836
837 if (h->metaf) {
838 print_tagq(h, h->metaf);
839 h->metaf = NULL;
840 }
841
842 h->flags &= ~HTML_IGNDELIM;
843 }
844
845 void
846 print_tagq(struct html *h, const struct tag *until)
847 {
848 struct tag *this, *next;
849
850 for (this = h->tag; this != NULL; this = next) {
851 next = this == until ? NULL : this->next;
852 print_ctag(h, this);
853 }
854 }
855
856 /*
857 * Close out all open elements up to but excluding suntil.
858 * Note that a paragraph just inside stays open together with it
859 * because paragraphs include subsequent phrasing content.
860 */
861 void
862 print_stagq(struct html *h, const struct tag *suntil)
863 {
864 struct tag *this, *next;
865
866 for (this = h->tag; this != NULL; this = next) {
867 next = this->next;
868 if (this == suntil || (next == suntil &&
869 (this->tag == TAG_P || this->tag == TAG_PRE)))
870 break;
871 print_ctag(h, this);
872 }
873 }
874
875
876 /***********************************************************************
877 * Low level output functions.
878 * They implement line breaking using a short static buffer.
879 ***********************************************************************/
880
881 /*
882 * Buffer one HTML output byte.
883 * If the buffer is full, flush and deactivate it and start a new line.
884 * If the buffer is inactive, print directly.
885 */
886 static void
887 print_byte(struct html *h, char c)
888 {
889 if ((h->flags & HTML_BUFFER) == 0) {
890 putchar(c);
891 h->col++;
892 return;
893 }
894
895 if (h->col + h->bufcol < sizeof(h->buf)) {
896 h->buf[h->bufcol++] = c;
897 return;
898 }
899
900 putchar('\n');
901 h->col = 0;
902 print_indent(h);
903 putchar(' ');
904 putchar(' ');
905 fwrite(h->buf, h->bufcol, 1, stdout);
906 putchar(c);
907 h->col = (h->indent + 1) * 2 + h->bufcol + 1;
908 h->bufcol = 0;
909 h->flags &= ~HTML_BUFFER;
910 }
911
912 /*
913 * If something was printed on the current output line, end it.
914 * Not to be called right after print_indent().
915 */
916 void
917 print_endline(struct html *h)
918 {
919 if (h->col == 0)
920 return;
921
922 if (h->bufcol) {
923 putchar(' ');
924 fwrite(h->buf, h->bufcol, 1, stdout);
925 h->bufcol = 0;
926 }
927 putchar('\n');
928 h->col = 0;
929 h->flags |= HTML_NOSPACE;
930 h->flags &= ~HTML_BUFFER;
931 }
932
933 /*
934 * Flush the HTML output buffer.
935 * If it is inactive, activate it.
936 */
937 static void
938 print_endword(struct html *h)
939 {
940 if (h->noindent) {
941 print_byte(h, ' ');
942 return;
943 }
944
945 if ((h->flags & HTML_BUFFER) == 0) {
946 h->col++;
947 h->flags |= HTML_BUFFER;
948 } else if (h->bufcol) {
949 putchar(' ');
950 fwrite(h->buf, h->bufcol, 1, stdout);
951 h->col += h->bufcol + 1;
952 }
953 h->bufcol = 0;
954 }
955
956 /*
957 * If at the beginning of a new output line,
958 * perform indentation and mark the line as containing output.
959 * Make sure to really produce some output right afterwards,
960 * but do not use print_otag() for producing it.
961 */
962 static void
963 print_indent(struct html *h)
964 {
965 size_t i;
966
967 if (h->col)
968 return;
969
970 if (h->noindent == 0) {
971 h->col = h->indent * 2;
972 for (i = 0; i < h->col; i++)
973 putchar(' ');
974 }
975 h->flags &= ~HTML_NOSPACE;
976 }
977
978 /*
979 * Print or buffer some characters
980 * depending on the current HTML output buffer state.
981 */
982 static void
983 print_word(struct html *h, const char *cp)
984 {
985 while (*cp != '\0')
986 print_byte(h, *cp++);
987 }
Unleashed OS