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John Gardner: handling of ASCII control characters during input
[mandoc.git] / mdoc_markdown.c
1 /* $Id: mdoc_markdown.c,v 1.35 2020/04/03 11:35:01 schwarze Exp $ */
2 /*
3 * Copyright (c) 2017, 2018, 2020 Ingo Schwarze <schwarze@openbsd.org>
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 *
17 * Markdown formatter for mdoc(7) used by mandoc(1).
18 */
19 #include <sys/types.h>
20
21 #include <assert.h>
22 #include <ctype.h>
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <string.h>
26
27 #include "mandoc_aux.h"
28 #include "mandoc.h"
29 #include "roff.h"
30 #include "mdoc.h"
31 #include "main.h"
32
33 struct md_act {
34 int (*cond)(struct roff_node *);
35 int (*pre)(struct roff_node *);
36 void (*post)(struct roff_node *);
37 const char *prefix; /* pre-node string constant */
38 const char *suffix; /* post-node string constant */
39 };
40
41 static void md_nodelist(struct roff_node *);
42 static void md_node(struct roff_node *);
43 static const char *md_stack(char);
44 static void md_preword(void);
45 static void md_rawword(const char *);
46 static void md_word(const char *);
47 static void md_named(const char *);
48 static void md_char(unsigned char);
49 static void md_uri(const char *);
50
51 static int md_cond_head(struct roff_node *);
52 static int md_cond_body(struct roff_node *);
53
54 static int md_pre_abort(struct roff_node *);
55 static int md_pre_raw(struct roff_node *);
56 static int md_pre_word(struct roff_node *);
57 static int md_pre_skip(struct roff_node *);
58 static void md_pre_syn(struct roff_node *);
59 static int md_pre_An(struct roff_node *);
60 static int md_pre_Ap(struct roff_node *);
61 static int md_pre_Bd(struct roff_node *);
62 static int md_pre_Bk(struct roff_node *);
63 static int md_pre_Bl(struct roff_node *);
64 static int md_pre_D1(struct roff_node *);
65 static int md_pre_Dl(struct roff_node *);
66 static int md_pre_En(struct roff_node *);
67 static int md_pre_Eo(struct roff_node *);
68 static int md_pre_Fa(struct roff_node *);
69 static int md_pre_Fd(struct roff_node *);
70 static int md_pre_Fn(struct roff_node *);
71 static int md_pre_Fo(struct roff_node *);
72 static int md_pre_In(struct roff_node *);
73 static int md_pre_It(struct roff_node *);
74 static int md_pre_Lk(struct roff_node *);
75 static int md_pre_Mt(struct roff_node *);
76 static int md_pre_Nd(struct roff_node *);
77 static int md_pre_Nm(struct roff_node *);
78 static int md_pre_No(struct roff_node *);
79 static int md_pre_Ns(struct roff_node *);
80 static int md_pre_Pp(struct roff_node *);
81 static int md_pre_Rs(struct roff_node *);
82 static int md_pre_Sh(struct roff_node *);
83 static int md_pre_Sm(struct roff_node *);
84 static int md_pre_Vt(struct roff_node *);
85 static int md_pre_Xr(struct roff_node *);
86 static int md_pre__T(struct roff_node *);
87 static int md_pre_br(struct roff_node *);
88
89 static void md_post_raw(struct roff_node *);
90 static void md_post_word(struct roff_node *);
91 static void md_post_pc(struct roff_node *);
92 static void md_post_Bk(struct roff_node *);
93 static void md_post_Bl(struct roff_node *);
94 static void md_post_D1(struct roff_node *);
95 static void md_post_En(struct roff_node *);
96 static void md_post_Eo(struct roff_node *);
97 static void md_post_Fa(struct roff_node *);
98 static void md_post_Fd(struct roff_node *);
99 static void md_post_Fl(struct roff_node *);
100 static void md_post_Fn(struct roff_node *);
101 static void md_post_Fo(struct roff_node *);
102 static void md_post_In(struct roff_node *);
103 static void md_post_It(struct roff_node *);
104 static void md_post_Lb(struct roff_node *);
105 static void md_post_Nm(struct roff_node *);
106 static void md_post_Pf(struct roff_node *);
107 static void md_post_Vt(struct roff_node *);
108 static void md_post__T(struct roff_node *);
109
110 static const struct md_act md_acts[MDOC_MAX - MDOC_Dd] = {
111 { NULL, NULL, NULL, NULL, NULL }, /* Dd */
112 { NULL, NULL, NULL, NULL, NULL }, /* Dt */
113 { NULL, NULL, NULL, NULL, NULL }, /* Os */
114 { NULL, md_pre_Sh, NULL, NULL, NULL }, /* Sh */
115 { NULL, md_pre_Sh, NULL, NULL, NULL }, /* Ss */
116 { NULL, md_pre_Pp, NULL, NULL, NULL }, /* Pp */
117 { md_cond_body, md_pre_D1, md_post_D1, NULL, NULL }, /* D1 */
118 { md_cond_body, md_pre_Dl, md_post_D1, NULL, NULL }, /* Dl */
119 { md_cond_body, md_pre_Bd, md_post_D1, NULL, NULL }, /* Bd */
120 { NULL, NULL, NULL, NULL, NULL }, /* Ed */
121 { md_cond_body, md_pre_Bl, md_post_Bl, NULL, NULL }, /* Bl */
122 { NULL, NULL, NULL, NULL, NULL }, /* El */
123 { NULL, md_pre_It, md_post_It, NULL, NULL }, /* It */
124 { NULL, md_pre_raw, md_post_raw, "*", "*" }, /* Ad */
125 { NULL, md_pre_An, NULL, NULL, NULL }, /* An */
126 { NULL, md_pre_Ap, NULL, NULL, NULL }, /* Ap */
127 { NULL, md_pre_raw, md_post_raw, "*", "*" }, /* Ar */
128 { NULL, md_pre_raw, md_post_raw, "**", "**" }, /* Cd */
129 { NULL, md_pre_raw, md_post_raw, "**", "**" }, /* Cm */
130 { NULL, md_pre_raw, md_post_raw, "`", "`" }, /* Dv */
131 { NULL, md_pre_raw, md_post_raw, "`", "`" }, /* Er */
132 { NULL, md_pre_raw, md_post_raw, "`", "`" }, /* Ev */
133 { NULL, NULL, NULL, NULL, NULL }, /* Ex */
134 { NULL, md_pre_Fa, md_post_Fa, NULL, NULL }, /* Fa */
135 { NULL, md_pre_Fd, md_post_Fd, "**", "**" }, /* Fd */
136 { NULL, md_pre_raw, md_post_Fl, "**-", "**" }, /* Fl */
137 { NULL, md_pre_Fn, md_post_Fn, NULL, NULL }, /* Fn */
138 { NULL, md_pre_Fd, md_post_raw, "*", "*" }, /* Ft */
139 { NULL, md_pre_raw, md_post_raw, "**", "**" }, /* Ic */
140 { NULL, md_pre_In, md_post_In, NULL, NULL }, /* In */
141 { NULL, md_pre_raw, md_post_raw, "`", "`" }, /* Li */
142 { md_cond_head, md_pre_Nd, NULL, NULL, NULL }, /* Nd */
143 { NULL, md_pre_Nm, md_post_Nm, "**", "**" }, /* Nm */
144 { md_cond_body, md_pre_word, md_post_word, "[", "]" }, /* Op */
145 { NULL, md_pre_abort, NULL, NULL, NULL }, /* Ot */
146 { NULL, md_pre_raw, md_post_raw, "*", "*" }, /* Pa */
147 { NULL, NULL, NULL, NULL, NULL }, /* Rv */
148 { NULL, NULL, NULL, NULL, NULL }, /* St */
149 { NULL, md_pre_raw, md_post_raw, "*", "*" }, /* Va */
150 { NULL, md_pre_Vt, md_post_Vt, "*", "*" }, /* Vt */
151 { NULL, md_pre_Xr, NULL, NULL, NULL }, /* Xr */
152 { NULL, NULL, md_post_pc, NULL, NULL }, /* %A */
153 { NULL, md_pre_raw, md_post_pc, "*", "*" }, /* %B */
154 { NULL, NULL, md_post_pc, NULL, NULL }, /* %D */
155 { NULL, md_pre_raw, md_post_pc, "*", "*" }, /* %I */
156 { NULL, md_pre_raw, md_post_pc, "*", "*" }, /* %J */
157 { NULL, NULL, md_post_pc, NULL, NULL }, /* %N */
158 { NULL, NULL, md_post_pc, NULL, NULL }, /* %O */
159 { NULL, NULL, md_post_pc, NULL, NULL }, /* %P */
160 { NULL, NULL, md_post_pc, NULL, NULL }, /* %R */
161 { NULL, md_pre__T, md_post__T, NULL, NULL }, /* %T */
162 { NULL, NULL, md_post_pc, NULL, NULL }, /* %V */
163 { NULL, NULL, NULL, NULL, NULL }, /* Ac */
164 { md_cond_body, md_pre_word, md_post_word, "<", ">" }, /* Ao */
165 { md_cond_body, md_pre_word, md_post_word, "<", ">" }, /* Aq */
166 { NULL, NULL, NULL, NULL, NULL }, /* At */
167 { NULL, NULL, NULL, NULL, NULL }, /* Bc */
168 { NULL, NULL, NULL, NULL, NULL }, /* Bf XXX not implemented */
169 { md_cond_body, md_pre_word, md_post_word, "[", "]" }, /* Bo */
170 { md_cond_body, md_pre_word, md_post_word, "[", "]" }, /* Bq */
171 { NULL, NULL, NULL, NULL, NULL }, /* Bsx */
172 { NULL, NULL, NULL, NULL, NULL }, /* Bx */
173 { NULL, NULL, NULL, NULL, NULL }, /* Db */
174 { NULL, NULL, NULL, NULL, NULL }, /* Dc */
175 { md_cond_body, md_pre_word, md_post_word, "\"", "\"" }, /* Do */
176 { md_cond_body, md_pre_word, md_post_word, "\"", "\"" }, /* Dq */
177 { NULL, NULL, NULL, NULL, NULL }, /* Ec */
178 { NULL, NULL, NULL, NULL, NULL }, /* Ef */
179 { NULL, md_pre_raw, md_post_raw, "*", "*" }, /* Em */
180 { md_cond_body, md_pre_Eo, md_post_Eo, NULL, NULL }, /* Eo */
181 { NULL, NULL, NULL, NULL, NULL }, /* Fx */
182 { NULL, md_pre_raw, md_post_raw, "**", "**" }, /* Ms */
183 { NULL, md_pre_No, NULL, NULL, NULL }, /* No */
184 { NULL, md_pre_Ns, NULL, NULL, NULL }, /* Ns */
185 { NULL, NULL, NULL, NULL, NULL }, /* Nx */
186 { NULL, NULL, NULL, NULL, NULL }, /* Ox */
187 { NULL, NULL, NULL, NULL, NULL }, /* Pc */
188 { NULL, NULL, md_post_Pf, NULL, NULL }, /* Pf */
189 { md_cond_body, md_pre_word, md_post_word, "(", ")" }, /* Po */
190 { md_cond_body, md_pre_word, md_post_word, "(", ")" }, /* Pq */
191 { NULL, NULL, NULL, NULL, NULL }, /* Qc */
192 { md_cond_body, md_pre_raw, md_post_raw, "'`", "`'" }, /* Ql */
193 { md_cond_body, md_pre_word, md_post_word, "\"", "\"" }, /* Qo */
194 { md_cond_body, md_pre_word, md_post_word, "\"", "\"" }, /* Qq */
195 { NULL, NULL, NULL, NULL, NULL }, /* Re */
196 { md_cond_body, md_pre_Rs, NULL, NULL, NULL }, /* Rs */
197 { NULL, NULL, NULL, NULL, NULL }, /* Sc */
198 { md_cond_body, md_pre_word, md_post_word, "'", "'" }, /* So */
199 { md_cond_body, md_pre_word, md_post_word, "'", "'" }, /* Sq */
200 { NULL, md_pre_Sm, NULL, NULL, NULL }, /* Sm */
201 { NULL, md_pre_raw, md_post_raw, "*", "*" }, /* Sx */
202 { NULL, md_pre_raw, md_post_raw, "**", "**" }, /* Sy */
203 { NULL, md_pre_raw, md_post_raw, "`", "`" }, /* Tn */
204 { NULL, NULL, NULL, NULL, NULL }, /* Ux */
205 { NULL, NULL, NULL, NULL, NULL }, /* Xc */
206 { NULL, NULL, NULL, NULL, NULL }, /* Xo */
207 { NULL, md_pre_Fo, md_post_Fo, "**", "**" }, /* Fo */
208 { NULL, NULL, NULL, NULL, NULL }, /* Fc */
209 { md_cond_body, md_pre_word, md_post_word, "[", "]" }, /* Oo */
210 { NULL, NULL, NULL, NULL, NULL }, /* Oc */
211 { NULL, md_pre_Bk, md_post_Bk, NULL, NULL }, /* Bk */
212 { NULL, NULL, NULL, NULL, NULL }, /* Ek */
213 { NULL, NULL, NULL, NULL, NULL }, /* Bt */
214 { NULL, NULL, NULL, NULL, NULL }, /* Hf */
215 { NULL, md_pre_raw, md_post_raw, "*", "*" }, /* Fr */
216 { NULL, NULL, NULL, NULL, NULL }, /* Ud */
217 { NULL, NULL, md_post_Lb, NULL, NULL }, /* Lb */
218 { NULL, md_pre_abort, NULL, NULL, NULL }, /* Lp */
219 { NULL, md_pre_Lk, NULL, NULL, NULL }, /* Lk */
220 { NULL, md_pre_Mt, NULL, NULL, NULL }, /* Mt */
221 { md_cond_body, md_pre_word, md_post_word, "{", "}" }, /* Brq */
222 { md_cond_body, md_pre_word, md_post_word, "{", "}" }, /* Bro */
223 { NULL, NULL, NULL, NULL, NULL }, /* Brc */
224 { NULL, NULL, md_post_pc, NULL, NULL }, /* %C */
225 { NULL, md_pre_skip, NULL, NULL, NULL }, /* Es */
226 { md_cond_body, md_pre_En, md_post_En, NULL, NULL }, /* En */
227 { NULL, NULL, NULL, NULL, NULL }, /* Dx */
228 { NULL, NULL, md_post_pc, NULL, NULL }, /* %Q */
229 { NULL, md_pre_Lk, md_post_pc, NULL, NULL }, /* %U */
230 { NULL, NULL, NULL, NULL, NULL }, /* Ta */
231 { NULL, md_pre_skip, NULL, NULL, NULL }, /* Tg */
232 };
233 static const struct md_act *md_act(enum roff_tok);
234
235 static int outflags;
236 #define MD_spc (1 << 0) /* Blank character before next word. */
237 #define MD_spc_force (1 << 1) /* Even before trailing punctuation. */
238 #define MD_nonl (1 << 2) /* Prevent linebreak in markdown code. */
239 #define MD_nl (1 << 3) /* Break markdown code line. */
240 #define MD_br (1 << 4) /* Insert an output line break. */
241 #define MD_sp (1 << 5) /* Insert a paragraph break. */
242 #define MD_Sm (1 << 6) /* Horizontal spacing mode. */
243 #define MD_Bk (1 << 7) /* Word keep mode. */
244 #define MD_An_split (1 << 8) /* Author mode is "split". */
245 #define MD_An_nosplit (1 << 9) /* Author mode is "nosplit". */
246
247 static int escflags; /* Escape in generated markdown code: */
248 #define ESC_BOL (1 << 0) /* "#*+-" near the beginning of a line. */
249 #define ESC_NUM (1 << 1) /* "." after a leading number. */
250 #define ESC_HYP (1 << 2) /* "(" immediately after "]". */
251 #define ESC_SQU (1 << 4) /* "]" when "[" is open. */
252 #define ESC_FON (1 << 5) /* "*" immediately after unrelated "*". */
253 #define ESC_EOL (1 << 6) /* " " at the and of a line. */
254
255 static int code_blocks, quote_blocks, list_blocks;
256 static int outcount;
257
258
259 static const struct md_act *
260 md_act(enum roff_tok tok)
261 {
262 assert(tok >= MDOC_Dd && tok <= MDOC_MAX);
263 return md_acts + (tok - MDOC_Dd);
264 }
265
266 void
267 markdown_mdoc(void *arg, const struct roff_meta *mdoc)
268 {
269 outflags = MD_Sm;
270 md_word(mdoc->title);
271 if (mdoc->msec != NULL) {
272 outflags &= ~MD_spc;
273 md_word("(");
274 md_word(mdoc->msec);
275 md_word(")");
276 }
277 md_word("-");
278 md_word(mdoc->vol);
279 if (mdoc->arch != NULL) {
280 md_word("(");
281 md_word(mdoc->arch);
282 md_word(")");
283 }
284 outflags |= MD_sp;
285
286 md_nodelist(mdoc->first->child);
287
288 outflags |= MD_sp;
289 md_word(mdoc->os);
290 md_word("-");
291 md_word(mdoc->date);
292 putchar('\n');
293 }
294
295 static void
296 md_nodelist(struct roff_node *n)
297 {
298 while (n != NULL) {
299 md_node(n);
300 n = n->next;
301 }
302 }
303
304 static void
305 md_node(struct roff_node *n)
306 {
307 const struct md_act *act;
308 int cond, process_children;
309
310 if (n->type == ROFFT_COMMENT || n->flags & NODE_NOPRT)
311 return;
312
313 if (outflags & MD_nonl)
314 outflags &= ~(MD_nl | MD_sp);
315 else if (outflags & MD_spc &&
316 n->flags & NODE_LINE &&
317 !roff_node_transparent(n))
318 outflags |= MD_nl;
319
320 act = NULL;
321 cond = 0;
322 process_children = 1;
323 n->flags &= ~NODE_ENDED;
324
325 if (n->type == ROFFT_TEXT) {
326 if (n->flags & NODE_DELIMC)
327 outflags &= ~(MD_spc | MD_spc_force);
328 else if (outflags & MD_Sm)
329 outflags |= MD_spc_force;
330 md_word(n->string);
331 if (n->flags & NODE_DELIMO)
332 outflags &= ~(MD_spc | MD_spc_force);
333 else if (outflags & MD_Sm)
334 outflags |= MD_spc;
335 } else if (n->tok < ROFF_MAX) {
336 switch (n->tok) {
337 case ROFF_br:
338 process_children = md_pre_br(n);
339 break;
340 case ROFF_sp:
341 process_children = md_pre_Pp(n);
342 break;
343 default:
344 process_children = 0;
345 break;
346 }
347 } else {
348 act = md_act(n->tok);
349 cond = act->cond == NULL || (*act->cond)(n);
350 if (cond && act->pre != NULL &&
351 (n->end == ENDBODY_NOT || n->child != NULL))
352 process_children = (*act->pre)(n);
353 }
354
355 if (process_children && n->child != NULL)
356 md_nodelist(n->child);
357
358 if (n->flags & NODE_ENDED)
359 return;
360
361 if (cond && act->post != NULL)
362 (*act->post)(n);
363
364 if (n->end != ENDBODY_NOT)
365 n->body->flags |= NODE_ENDED;
366 }
367
368 static const char *
369 md_stack(char c)
370 {
371 static char *stack;
372 static size_t sz;
373 static size_t cur;
374
375 switch (c) {
376 case '\0':
377 break;
378 case (char)-1:
379 assert(cur);
380 stack[--cur] = '\0';
381 break;
382 default:
383 if (cur + 1 >= sz) {
384 sz += 8;
385 stack = mandoc_realloc(stack, sz);
386 }
387 stack[cur] = c;
388 stack[++cur] = '\0';
389 break;
390 }
391 return stack == NULL ? "" : stack;
392 }
393
394 /*
395 * Handle vertical and horizontal spacing.
396 */
397 static void
398 md_preword(void)
399 {
400 const char *cp;
401
402 /*
403 * If a list block is nested inside a code block or a blockquote,
404 * blank lines for paragraph breaks no longer work; instead,
405 * they terminate the list. Work around this markdown issue
406 * by using mere line breaks instead.
407 */
408
409 if (list_blocks && outflags & MD_sp) {
410 outflags &= ~MD_sp;
411 outflags |= MD_br;
412 }
413
414 /*
415 * End the old line if requested.
416 * Escape whitespace at the end of the markdown line
417 * such that it won't look like an output line break.
418 */
419
420 if (outflags & MD_sp)
421 putchar('\n');
422 else if (outflags & MD_br) {
423 putchar(' ');
424 putchar(' ');
425 } else if (outflags & MD_nl && escflags & ESC_EOL)
426 md_named("zwnj");
427
428 /* Start a new line if necessary. */
429
430 if (outflags & (MD_nl | MD_br | MD_sp)) {
431 putchar('\n');
432 for (cp = md_stack('\0'); *cp != '\0'; cp++) {
433 putchar(*cp);
434 if (*cp == '>')
435 putchar(' ');
436 }
437 outflags &= ~(MD_nl | MD_br | MD_sp);
438 escflags = ESC_BOL;
439 outcount = 0;
440
441 /* Handle horizontal spacing. */
442
443 } else if (outflags & MD_spc) {
444 if (outflags & MD_Bk)
445 fputs("&nbsp;", stdout);
446 else
447 putchar(' ');
448 escflags &= ~ESC_FON;
449 outcount++;
450 }
451
452 outflags &= ~(MD_spc_force | MD_nonl);
453 if (outflags & MD_Sm)
454 outflags |= MD_spc;
455 else
456 outflags &= ~MD_spc;
457 }
458
459 /*
460 * Print markdown syntax elements.
461 * Can also be used for constant strings when neither escaping
462 * nor delimiter handling is required.
463 */
464 static void
465 md_rawword(const char *s)
466 {
467 md_preword();
468
469 if (*s == '\0')
470 return;
471
472 if (escflags & ESC_FON) {
473 escflags &= ~ESC_FON;
474 if (*s == '*' && !code_blocks)
475 fputs("&zwnj;", stdout);
476 }
477
478 while (*s != '\0') {
479 switch(*s) {
480 case '*':
481 if (s[1] == '\0')
482 escflags |= ESC_FON;
483 break;
484 case '[':
485 escflags |= ESC_SQU;
486 break;
487 case ']':
488 escflags |= ESC_HYP;
489 escflags &= ~ESC_SQU;
490 break;
491 default:
492 break;
493 }
494 md_char(*s++);
495 }
496 if (s[-1] == ' ')
497 escflags |= ESC_EOL;
498 else
499 escflags &= ~ESC_EOL;
500 }
501
502 /*
503 * Print text and mdoc(7) syntax elements.
504 */
505 static void
506 md_word(const char *s)
507 {
508 const char *seq, *prevfont, *currfont, *nextfont;
509 char c;
510 int bs, sz, uc, breakline;
511
512 /* No spacing before closing delimiters. */
513 if (s[0] != '\0' && s[1] == '\0' &&
514 strchr("!),.:;?]", s[0]) != NULL &&
515 (outflags & MD_spc_force) == 0)
516 outflags &= ~MD_spc;
517
518 md_preword();
519
520 if (*s == '\0')
521 return;
522
523 /* No spacing after opening delimiters. */
524 if ((s[0] == '(' || s[0] == '[') && s[1] == '\0')
525 outflags &= ~MD_spc;
526
527 breakline = 0;
528 prevfont = currfont = "";
529 while ((c = *s++) != '\0') {
530 bs = 0;
531 switch(c) {
532 case ASCII_NBRSP:
533 if (code_blocks)
534 c = ' ';
535 else {
536 md_named("nbsp");
537 c = '\0';
538 }
539 break;
540 case ASCII_HYPH:
541 bs = escflags & ESC_BOL && !code_blocks;
542 c = '-';
543 break;
544 case ASCII_BREAK:
545 continue;
546 case '#':
547 case '+':
548 case '-':
549 bs = escflags & ESC_BOL && !code_blocks;
550 break;
551 case '(':
552 bs = escflags & ESC_HYP && !code_blocks;
553 break;
554 case ')':
555 bs = escflags & ESC_NUM && !code_blocks;
556 break;
557 case '*':
558 case '[':
559 case '_':
560 case '`':
561 bs = !code_blocks;
562 break;
563 case '.':
564 bs = escflags & ESC_NUM && !code_blocks;
565 break;
566 case '<':
567 if (code_blocks == 0) {
568 md_named("lt");
569 c = '\0';
570 }
571 break;
572 case '=':
573 if (escflags & ESC_BOL && !code_blocks) {
574 md_named("equals");
575 c = '\0';
576 }
577 break;
578 case '>':
579 if (code_blocks == 0) {
580 md_named("gt");
581 c = '\0';
582 }
583 break;
584 case '\\':
585 uc = 0;
586 nextfont = NULL;
587 switch (mandoc_escape(&s, &seq, &sz)) {
588 case ESCAPE_UNICODE:
589 uc = mchars_num2uc(seq + 1, sz - 1);
590 break;
591 case ESCAPE_NUMBERED:
592 uc = mchars_num2char(seq, sz);
593 break;
594 case ESCAPE_SPECIAL:
595 uc = mchars_spec2cp(seq, sz);
596 break;
597 case ESCAPE_UNDEF:
598 uc = *seq;
599 break;
600 case ESCAPE_DEVICE:
601 md_rawword("markdown");
602 continue;
603 case ESCAPE_FONTBOLD:
604 nextfont = "**";
605 break;
606 case ESCAPE_FONTITALIC:
607 nextfont = "*";
608 break;
609 case ESCAPE_FONTBI:
610 nextfont = "***";
611 break;
612 case ESCAPE_FONT:
613 case ESCAPE_FONTCW:
614 case ESCAPE_FONTROMAN:
615 nextfont = "";
616 break;
617 case ESCAPE_FONTPREV:
618 nextfont = prevfont;
619 break;
620 case ESCAPE_BREAK:
621 breakline = 1;
622 break;
623 case ESCAPE_NOSPACE:
624 case ESCAPE_SKIPCHAR:
625 case ESCAPE_OVERSTRIKE:
626 /* XXX not implemented */
627 /* FALLTHROUGH */
628 case ESCAPE_ERROR:
629 default:
630 break;
631 }
632 if (nextfont != NULL && !code_blocks) {
633 if (*currfont != '\0') {
634 outflags &= ~MD_spc;
635 md_rawword(currfont);
636 }
637 prevfont = currfont;
638 currfont = nextfont;
639 if (*currfont != '\0') {
640 outflags &= ~MD_spc;
641 md_rawword(currfont);
642 }
643 }
644 if (uc) {
645 if ((uc < 0x20 && uc != 0x09) ||
646 (uc > 0x7E && uc < 0xA0))
647 uc = 0xFFFD;
648 if (code_blocks) {
649 seq = mchars_uc2str(uc);
650 fputs(seq, stdout);
651 outcount += strlen(seq);
652 } else {
653 printf("&#%d;", uc);
654 outcount++;
655 }
656 escflags &= ~ESC_FON;
657 }
658 c = '\0';
659 break;
660 case ']':
661 bs = escflags & ESC_SQU && !code_blocks;
662 escflags |= ESC_HYP;
663 break;
664 default:
665 break;
666 }
667 if (bs)
668 putchar('\\');
669 md_char(c);
670 if (breakline &&
671 (*s == '\0' || *s == ' ' || *s == ASCII_NBRSP)) {
672 printf(" \n");
673 breakline = 0;
674 while (*s == ' ' || *s == ASCII_NBRSP)
675 s++;
676 }
677 }
678 if (*currfont != '\0') {
679 outflags &= ~MD_spc;
680 md_rawword(currfont);
681 } else if (s[-2] == ' ')
682 escflags |= ESC_EOL;
683 else
684 escflags &= ~ESC_EOL;
685 }
686
687 /*
688 * Print a single HTML named character reference.
689 */
690 static void
691 md_named(const char *s)
692 {
693 printf("&%s;", s);
694 escflags &= ~(ESC_FON | ESC_EOL);
695 outcount++;
696 }
697
698 /*
699 * Print a single raw character and maintain certain escape flags.
700 */
701 static void
702 md_char(unsigned char c)
703 {
704 if (c != '\0') {
705 putchar(c);
706 if (c == '*')
707 escflags |= ESC_FON;
708 else
709 escflags &= ~ESC_FON;
710 outcount++;
711 }
712 if (c != ']')
713 escflags &= ~ESC_HYP;
714 if (c == ' ' || c == '\t' || c == '>')
715 return;
716 if (isdigit(c) == 0)
717 escflags &= ~ESC_NUM;
718 else if (escflags & ESC_BOL)
719 escflags |= ESC_NUM;
720 escflags &= ~ESC_BOL;
721 }
722
723 static int
724 md_cond_head(struct roff_node *n)
725 {
726 return n->type == ROFFT_HEAD;
727 }
728
729 static int
730 md_cond_body(struct roff_node *n)
731 {
732 return n->type == ROFFT_BODY;
733 }
734
735 static int
736 md_pre_abort(struct roff_node *n)
737 {
738 abort();
739 }
740
741 static int
742 md_pre_raw(struct roff_node *n)
743 {
744 const char *prefix;
745
746 if ((prefix = md_act(n->tok)->prefix) != NULL) {
747 md_rawword(prefix);
748 outflags &= ~MD_spc;
749 if (*prefix == '`')
750 code_blocks++;
751 }
752 return 1;
753 }
754
755 static void
756 md_post_raw(struct roff_node *n)
757 {
758 const char *suffix;
759
760 if ((suffix = md_act(n->tok)->suffix) != NULL) {
761 outflags &= ~(MD_spc | MD_nl);
762 md_rawword(suffix);
763 if (*suffix == '`')
764 code_blocks--;
765 }
766 }
767
768 static int
769 md_pre_word(struct roff_node *n)
770 {
771 const char *prefix;
772
773 if ((prefix = md_act(n->tok)->prefix) != NULL) {
774 md_word(prefix);
775 outflags &= ~MD_spc;
776 }
777 return 1;
778 }
779
780 static void
781 md_post_word(struct roff_node *n)
782 {
783 const char *suffix;
784
785 if ((suffix = md_act(n->tok)->suffix) != NULL) {
786 outflags &= ~(MD_spc | MD_nl);
787 md_word(suffix);
788 }
789 }
790
791 static void
792 md_post_pc(struct roff_node *n)
793 {
794 struct roff_node *nn;
795
796 md_post_raw(n);
797 if (n->parent->tok != MDOC_Rs)
798 return;
799
800 if ((nn = roff_node_next(n)) != NULL) {
801 md_word(",");
802 if (nn->tok == n->tok &&
803 (nn = roff_node_prev(n)) != NULL &&
804 nn->tok == n->tok)
805 md_word("and");
806 } else {
807 md_word(".");
808 outflags |= MD_nl;
809 }
810 }
811
812 static int
813 md_pre_skip(struct roff_node *n)
814 {
815 return 0;
816 }
817
818 static void
819 md_pre_syn(struct roff_node *n)
820 {
821 struct roff_node *np;
822
823 if ((n->flags & NODE_SYNPRETTY) == 0 ||
824 (np = roff_node_prev(n)) == NULL)
825 return;
826
827 if (np->tok == n->tok &&
828 n->tok != MDOC_Ft &&
829 n->tok != MDOC_Fo &&
830 n->tok != MDOC_Fn) {
831 outflags |= MD_br;
832 return;
833 }
834
835 switch (np->tok) {
836 case MDOC_Fd:
837 case MDOC_Fn:
838 case MDOC_Fo:
839 case MDOC_In:
840 case MDOC_Vt:
841 outflags |= MD_sp;
842 break;
843 case MDOC_Ft:
844 if (n->tok != MDOC_Fn && n->tok != MDOC_Fo) {
845 outflags |= MD_sp;
846 break;
847 }
848 /* FALLTHROUGH */
849 default:
850 outflags |= MD_br;
851 break;
852 }
853 }
854
855 static int
856 md_pre_An(struct roff_node *n)
857 {
858 switch (n->norm->An.auth) {
859 case AUTH_split:
860 outflags &= ~MD_An_nosplit;
861 outflags |= MD_An_split;
862 return 0;
863 case AUTH_nosplit:
864 outflags &= ~MD_An_split;
865 outflags |= MD_An_nosplit;
866 return 0;
867 default:
868 if (outflags & MD_An_split)
869 outflags |= MD_br;
870 else if (n->sec == SEC_AUTHORS &&
871 ! (outflags & MD_An_nosplit))
872 outflags |= MD_An_split;
873 return 1;
874 }
875 }
876
877 static int
878 md_pre_Ap(struct roff_node *n)
879 {
880 outflags &= ~MD_spc;
881 md_word("'");
882 outflags &= ~MD_spc;
883 return 0;
884 }
885
886 static int
887 md_pre_Bd(struct roff_node *n)
888 {
889 switch (n->norm->Bd.type) {
890 case DISP_unfilled:
891 case DISP_literal:
892 return md_pre_Dl(n);
893 default:
894 return md_pre_D1(n);
895 }
896 }
897
898 static int
899 md_pre_Bk(struct roff_node *n)
900 {
901 switch (n->type) {
902 case ROFFT_BLOCK:
903 return 1;
904 case ROFFT_BODY:
905 outflags |= MD_Bk;
906 return 1;
907 default:
908 return 0;
909 }
910 }
911
912 static void
913 md_post_Bk(struct roff_node *n)
914 {
915 if (n->type == ROFFT_BODY)
916 outflags &= ~MD_Bk;
917 }
918
919 static int
920 md_pre_Bl(struct roff_node *n)
921 {
922 n->norm->Bl.count = 0;
923 if (n->norm->Bl.type == LIST_column)
924 md_pre_Dl(n);
925 outflags |= MD_sp;
926 return 1;
927 }
928
929 static void
930 md_post_Bl(struct roff_node *n)
931 {
932 n->norm->Bl.count = 0;
933 if (n->norm->Bl.type == LIST_column)
934 md_post_D1(n);
935 outflags |= MD_sp;
936 }
937
938 static int
939 md_pre_D1(struct roff_node *n)
940 {
941 /*
942 * Markdown blockquote syntax does not work inside code blocks.
943 * The best we can do is fall back to another nested code block.
944 */
945 if (code_blocks) {
946 md_stack('\t');
947 code_blocks++;
948 } else {
949 md_stack('>');
950 quote_blocks++;
951 }
952 outflags |= MD_sp;
953 return 1;
954 }
955
956 static void
957 md_post_D1(struct roff_node *n)
958 {
959 md_stack((char)-1);
960 if (code_blocks)
961 code_blocks--;
962 else
963 quote_blocks--;
964 outflags |= MD_sp;
965 }
966
967 static int
968 md_pre_Dl(struct roff_node *n)
969 {
970 /*
971 * Markdown code block syntax does not work inside blockquotes.
972 * The best we can do is fall back to another nested blockquote.
973 */
974 if (quote_blocks) {
975 md_stack('>');
976 quote_blocks++;
977 } else {
978 md_stack('\t');
979 code_blocks++;
980 }
981 outflags |= MD_sp;
982 return 1;
983 }
984
985 static int
986 md_pre_En(struct roff_node *n)
987 {
988 if (n->norm->Es == NULL ||
989 n->norm->Es->child == NULL)
990 return 1;
991
992 md_word(n->norm->Es->child->string);
993 outflags &= ~MD_spc;
994 return 1;
995 }
996
997 static void
998 md_post_En(struct roff_node *n)
999 {
1000 if (n->norm->Es == NULL ||
1001 n->norm->Es->child == NULL ||
1002 n->norm->Es->child->next == NULL)
1003 return;
1004
1005 outflags &= ~MD_spc;
1006 md_word(n->norm->Es->child->next->string);
1007 }
1008
1009 static int
1010 md_pre_Eo(struct roff_node *n)
1011 {
1012 if (n->end == ENDBODY_NOT &&
1013 n->parent->head->child == NULL &&
1014 n->child != NULL &&
1015 n->child->end != ENDBODY_NOT)
1016 md_preword();
1017 else if (n->end != ENDBODY_NOT ? n->child != NULL :
1018 n->parent->head->child != NULL && (n->child != NULL ||
1019 (n->parent->tail != NULL && n->parent->tail->child != NULL)))
1020 outflags &= ~(MD_spc | MD_nl);
1021 return 1;
1022 }
1023
1024 static void
1025 md_post_Eo(struct roff_node *n)
1026 {
1027 if (n->end != ENDBODY_NOT) {
1028 outflags |= MD_spc;
1029 return;
1030 }
1031
1032 if (n->child == NULL && n->parent->head->child == NULL)
1033 return;
1034
1035 if (n->parent->tail != NULL && n->parent->tail->child != NULL)
1036 outflags &= ~MD_spc;
1037 else
1038 outflags |= MD_spc;
1039 }
1040
1041 static int
1042 md_pre_Fa(struct roff_node *n)
1043 {
1044 int am_Fa;
1045
1046 am_Fa = n->tok == MDOC_Fa;
1047
1048 if (am_Fa)
1049 n = n->child;
1050
1051 while (n != NULL) {
1052 md_rawword("*");
1053 outflags &= ~MD_spc;
1054 md_node(n);
1055 outflags &= ~MD_spc;
1056 md_rawword("*");
1057 if ((n = n->next) != NULL)
1058 md_word(",");
1059 }
1060 return 0;
1061 }
1062
1063 static void
1064 md_post_Fa(struct roff_node *n)
1065 {
1066 struct roff_node *nn;
1067
1068 if ((nn = roff_node_next(n)) != NULL && nn->tok == MDOC_Fa)
1069 md_word(",");
1070 }
1071
1072 static int
1073 md_pre_Fd(struct roff_node *n)
1074 {
1075 md_pre_syn(n);
1076 md_pre_raw(n);
1077 return 1;
1078 }
1079
1080 static void
1081 md_post_Fd(struct roff_node *n)
1082 {
1083 md_post_raw(n);
1084 outflags |= MD_br;
1085 }
1086
1087 static void
1088 md_post_Fl(struct roff_node *n)
1089 {
1090 struct roff_node *nn;
1091
1092 md_post_raw(n);
1093 if (n->child == NULL && (nn = roff_node_next(n)) != NULL &&
1094 nn->type != ROFFT_TEXT && (nn->flags & NODE_LINE) == 0)
1095 outflags &= ~MD_spc;
1096 }
1097
1098 static int
1099 md_pre_Fn(struct roff_node *n)
1100 {
1101 md_pre_syn(n);
1102
1103 if ((n = n->child) == NULL)
1104 return 0;
1105
1106 md_rawword("**");
1107 outflags &= ~MD_spc;
1108 md_node(n);
1109 outflags &= ~MD_spc;
1110 md_rawword("**");
1111 outflags &= ~MD_spc;
1112 md_word("(");
1113
1114 if ((n = n->next) != NULL)
1115 md_pre_Fa(n);
1116 return 0;
1117 }
1118
1119 static void
1120 md_post_Fn(struct roff_node *n)
1121 {
1122 md_word(")");
1123 if (n->flags & NODE_SYNPRETTY) {
1124 md_word(";");
1125 outflags |= MD_sp;
1126 }
1127 }
1128
1129 static int
1130 md_pre_Fo(struct roff_node *n)
1131 {
1132 switch (n->type) {
1133 case ROFFT_BLOCK:
1134 md_pre_syn(n);
1135 break;
1136 case ROFFT_HEAD:
1137 if (n->child == NULL)
1138 return 0;
1139 md_pre_raw(n);
1140 break;
1141 case ROFFT_BODY:
1142 outflags &= ~(MD_spc | MD_nl);
1143 md_word("(");
1144 break;
1145 default:
1146 break;
1147 }
1148 return 1;
1149 }
1150
1151 static void
1152 md_post_Fo(struct roff_node *n)
1153 {
1154 switch (n->type) {
1155 case ROFFT_HEAD:
1156 if (n->child != NULL)
1157 md_post_raw(n);
1158 break;
1159 case ROFFT_BODY:
1160 md_post_Fn(n);
1161 break;
1162 default:
1163 break;
1164 }
1165 }
1166
1167 static int
1168 md_pre_In(struct roff_node *n)
1169 {
1170 if (n->flags & NODE_SYNPRETTY) {
1171 md_pre_syn(n);
1172 md_rawword("**");
1173 outflags &= ~MD_spc;
1174 md_word("#include <");
1175 } else {
1176 md_word("<");
1177 outflags &= ~MD_spc;
1178 md_rawword("*");
1179 }
1180 outflags &= ~MD_spc;
1181 return 1;
1182 }
1183
1184 static void
1185 md_post_In(struct roff_node *n)
1186 {
1187 if (n->flags & NODE_SYNPRETTY) {
1188 outflags &= ~MD_spc;
1189 md_rawword(">**");
1190 outflags |= MD_nl;
1191 } else {
1192 outflags &= ~MD_spc;
1193 md_rawword("*>");
1194 }
1195 }
1196
1197 static int
1198 md_pre_It(struct roff_node *n)
1199 {
1200 struct roff_node *bln;
1201
1202 switch (n->type) {
1203 case ROFFT_BLOCK:
1204 return 1;
1205
1206 case ROFFT_HEAD:
1207 bln = n->parent->parent;
1208 if (bln->norm->Bl.comp == 0 &&
1209 bln->norm->Bl.type != LIST_column)
1210 outflags |= MD_sp;
1211 outflags |= MD_nl;
1212
1213 switch (bln->norm->Bl.type) {
1214 case LIST_item:
1215 outflags |= MD_br;
1216 return 0;
1217 case LIST_inset:
1218 case LIST_diag:
1219 case LIST_ohang:
1220 outflags |= MD_br;
1221 return 1;
1222 case LIST_tag:
1223 case LIST_hang:
1224 outflags |= MD_sp;
1225 return 1;
1226 case LIST_bullet:
1227 md_rawword("*\t");
1228 break;
1229 case LIST_dash:
1230 case LIST_hyphen:
1231 md_rawword("-\t");
1232 break;
1233 case LIST_enum:
1234 md_preword();
1235 if (bln->norm->Bl.count < 99)
1236 bln->norm->Bl.count++;
1237 printf("%d.\t", bln->norm->Bl.count);
1238 escflags &= ~ESC_FON;
1239 break;
1240 case LIST_column:
1241 outflags |= MD_br;
1242 return 0;
1243 default:
1244 return 0;
1245 }
1246 outflags &= ~MD_spc;
1247 outflags |= MD_nonl;
1248 outcount = 0;
1249 md_stack('\t');
1250 if (code_blocks || quote_blocks)
1251 list_blocks++;
1252 return 0;
1253
1254 case ROFFT_BODY:
1255 bln = n->parent->parent;
1256 switch (bln->norm->Bl.type) {
1257 case LIST_ohang:
1258 outflags |= MD_br;
1259 break;
1260 case LIST_tag:
1261 case LIST_hang:
1262 md_pre_D1(n);
1263 break;
1264 default:
1265 break;
1266 }
1267 return 1;
1268
1269 default:
1270 return 0;
1271 }
1272 }
1273
1274 static void
1275 md_post_It(struct roff_node *n)
1276 {
1277 struct roff_node *bln;
1278 int i, nc;
1279
1280 if (n->type != ROFFT_BODY)
1281 return;
1282
1283 bln = n->parent->parent;
1284 switch (bln->norm->Bl.type) {
1285 case LIST_bullet:
1286 case LIST_dash:
1287 case LIST_hyphen:
1288 case LIST_enum:
1289 md_stack((char)-1);
1290 if (code_blocks || quote_blocks)
1291 list_blocks--;
1292 break;
1293 case LIST_tag:
1294 case LIST_hang:
1295 md_post_D1(n);
1296 break;
1297
1298 case LIST_column:
1299 if (n->next == NULL)
1300 break;
1301
1302 /* Calculate the array index of the current column. */
1303
1304 i = 0;
1305 while ((n = n->prev) != NULL && n->type != ROFFT_HEAD)
1306 i++;
1307
1308 /*
1309 * If a width was specified for this column,
1310 * subtract what printed, and
1311 * add the same spacing as in mdoc_term.c.
1312 */
1313
1314 nc = bln->norm->Bl.ncols;
1315 i = i < nc ? strlen(bln->norm->Bl.cols[i]) - outcount +
1316 (nc < 5 ? 4 : nc == 5 ? 3 : 1) : 1;
1317 if (i < 1)
1318 i = 1;
1319 while (i-- > 0)
1320 putchar(' ');
1321
1322 outflags &= ~MD_spc;
1323 escflags &= ~ESC_FON;
1324 outcount = 0;
1325 break;
1326
1327 default:
1328 break;
1329 }
1330 }
1331
1332 static void
1333 md_post_Lb(struct roff_node *n)
1334 {
1335 if (n->sec == SEC_LIBRARY)
1336 outflags |= MD_br;
1337 }
1338
1339 static void
1340 md_uri(const char *s)
1341 {
1342 while (*s != '\0') {
1343 if (strchr("%()<>", *s) != NULL) {
1344 printf("%%%2.2hhX", *s);
1345 outcount += 3;
1346 } else {
1347 putchar(*s);
1348 outcount++;
1349 }
1350 s++;
1351 }
1352 }
1353
1354 static int
1355 md_pre_Lk(struct roff_node *n)
1356 {
1357 const struct roff_node *link, *descr, *punct;
1358
1359 if ((link = n->child) == NULL)
1360 return 0;
1361
1362 /* Find beginning of trailing punctuation. */
1363 punct = n->last;
1364 while (punct != link && punct->flags & NODE_DELIMC)
1365 punct = punct->prev;
1366 punct = punct->next;
1367
1368 /* Link text. */
1369 descr = link->next;
1370 if (descr == punct)
1371 descr = link; /* no text */
1372 md_rawword("[");
1373 outflags &= ~MD_spc;
1374 do {
1375 md_word(descr->string);
1376 descr = descr->next;
1377 } while (descr != punct);
1378 outflags &= ~MD_spc;
1379
1380 /* Link target. */
1381 md_rawword("](");
1382 md_uri(link->string);
1383 outflags &= ~MD_spc;
1384 md_rawword(")");
1385
1386 /* Trailing punctuation. */
1387 while (punct != NULL) {
1388 md_word(punct->string);
1389 punct = punct->next;
1390 }
1391 return 0;
1392 }
1393
1394 static int
1395 md_pre_Mt(struct roff_node *n)
1396 {
1397 const struct roff_node *nch;
1398
1399 md_rawword("[");
1400 outflags &= ~MD_spc;
1401 for (nch = n->child; nch != NULL; nch = nch->next)
1402 md_word(nch->string);
1403 outflags &= ~MD_spc;
1404 md_rawword("](mailto:");
1405 for (nch = n->child; nch != NULL; nch = nch->next) {
1406 md_uri(nch->string);
1407 if (nch->next != NULL) {
1408 putchar(' ');
1409 outcount++;
1410 }
1411 }
1412 outflags &= ~MD_spc;
1413 md_rawword(")");
1414 return 0;
1415 }
1416
1417 static int
1418 md_pre_Nd(struct roff_node *n)
1419 {
1420 outflags &= ~MD_nl;
1421 outflags |= MD_spc;
1422 md_word("-");
1423 return 1;
1424 }
1425
1426 static int
1427 md_pre_Nm(struct roff_node *n)
1428 {
1429 switch (n->type) {
1430 case ROFFT_BLOCK:
1431 outflags |= MD_Bk;
1432 md_pre_syn(n);
1433 break;
1434 case ROFFT_HEAD:
1435 case ROFFT_ELEM:
1436 md_pre_raw(n);
1437 break;
1438 default:
1439 break;
1440 }
1441 return 1;
1442 }
1443
1444 static void
1445 md_post_Nm(struct roff_node *n)
1446 {
1447 switch (n->type) {
1448 case ROFFT_BLOCK:
1449 outflags &= ~MD_Bk;
1450 break;
1451 case ROFFT_HEAD:
1452 case ROFFT_ELEM:
1453 md_post_raw(n);
1454 break;
1455 default:
1456 break;
1457 }
1458 }
1459
1460 static int
1461 md_pre_No(struct roff_node *n)
1462 {
1463 outflags |= MD_spc_force;
1464 return 1;
1465 }
1466
1467 static int
1468 md_pre_Ns(struct roff_node *n)
1469 {
1470 outflags &= ~MD_spc;
1471 return 0;
1472 }
1473
1474 static void
1475 md_post_Pf(struct roff_node *n)
1476 {
1477 if (n->next != NULL && (n->next->flags & NODE_LINE) == 0)
1478 outflags &= ~MD_spc;
1479 }
1480
1481 static int
1482 md_pre_Pp(struct roff_node *n)
1483 {
1484 outflags |= MD_sp;
1485 return 0;
1486 }
1487
1488 static int
1489 md_pre_Rs(struct roff_node *n)
1490 {
1491 if (n->sec == SEC_SEE_ALSO)
1492 outflags |= MD_sp;
1493 return 1;
1494 }
1495
1496 static int
1497 md_pre_Sh(struct roff_node *n)
1498 {
1499 switch (n->type) {
1500 case ROFFT_BLOCK:
1501 if (n->sec == SEC_AUTHORS)
1502 outflags &= ~(MD_An_split | MD_An_nosplit);
1503 break;
1504 case ROFFT_HEAD:
1505 outflags |= MD_sp;
1506 md_rawword(n->tok == MDOC_Sh ? "#" : "##");
1507 break;
1508 case ROFFT_BODY:
1509 outflags |= MD_sp;
1510 break;
1511 default:
1512 break;
1513 }
1514 return 1;
1515 }
1516
1517 static int
1518 md_pre_Sm(struct roff_node *n)
1519 {
1520 if (n->child == NULL)
1521 outflags ^= MD_Sm;
1522 else if (strcmp("on", n->child->string) == 0)
1523 outflags |= MD_Sm;
1524 else
1525 outflags &= ~MD_Sm;
1526
1527 if (outflags & MD_Sm)
1528 outflags |= MD_spc;
1529
1530 return 0;
1531 }
1532
1533 static int
1534 md_pre_Vt(struct roff_node *n)
1535 {
1536 switch (n->type) {
1537 case ROFFT_BLOCK:
1538 md_pre_syn(n);
1539 return 1;
1540 case ROFFT_BODY:
1541 case ROFFT_ELEM:
1542 md_pre_raw(n);
1543 return 1;
1544 default:
1545 return 0;
1546 }
1547 }
1548
1549 static void
1550 md_post_Vt(struct roff_node *n)
1551 {
1552 switch (n->type) {
1553 case ROFFT_BODY:
1554 case ROFFT_ELEM:
1555 md_post_raw(n);
1556 break;
1557 default:
1558 break;
1559 }
1560 }
1561
1562 static int
1563 md_pre_Xr(struct roff_node *n)
1564 {
1565 n = n->child;
1566 if (n == NULL)
1567 return 0;
1568 md_node(n);
1569 n = n->next;
1570 if (n == NULL)
1571 return 0;
1572 outflags &= ~MD_spc;
1573 md_word("(");
1574 md_node(n);
1575 md_word(")");
1576 return 0;
1577 }
1578
1579 static int
1580 md_pre__T(struct roff_node *n)
1581 {
1582 if (n->parent->tok == MDOC_Rs && n->parent->norm->Rs.quote_T)
1583 md_word("\"");
1584 else
1585 md_rawword("*");
1586 outflags &= ~MD_spc;
1587 return 1;
1588 }
1589
1590 static void
1591 md_post__T(struct roff_node *n)
1592 {
1593 outflags &= ~MD_spc;
1594 if (n->parent->tok == MDOC_Rs && n->parent->norm->Rs.quote_T)
1595 md_word("\"");
1596 else
1597 md_rawword("*");
1598 md_post_pc(n);
1599 }
1600
1601 static int
1602 md_pre_br(struct roff_node *n)
1603 {
1604 outflags |= MD_br;
1605 return 0;
1606 }
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