xref: /dragonfly/contrib/mdocml/man.c (revision 4d0c54c1) 
1 /*	$Id: man.c,v 1.107 2011/03/29 08:30:49 kristaps Exp $ */
2 /*
3  * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
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 AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR 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 #ifdef HAVE_CONFIG_H
18 #include "config.h"
19 #endif
20 
21 #include <sys/types.h>
22 
23 #include <assert.h>
24 #include <stdarg.h>
25 #include <stdlib.h>
26 #include <stdio.h>
27 #include <string.h>
28 
29 #include "man.h"
30 #include "mandoc.h"
31 #include "libman.h"
32 #include "libmandoc.h"
33 
34 const	char *const __man_macronames[MAN_MAX] = {
35 	"br",		"TH",		"SH",		"SS",
36 	"TP", 		"LP",		"PP",		"P",
37 	"IP",		"HP",		"SM",		"SB",
38 	"BI",		"IB",		"BR",		"RB",
39 	"R",		"B",		"I",		"IR",
40 	"RI",		"na",		"sp",		"nf",
41 	"fi",		"RE",		"RS",		"DT",
42 	"UC",		"PD",		"AT",		"in",
43 	"ft"
44 	};
45 
46 const	char * const *man_macronames = __man_macronames;
47 
48 static	struct man_node	*man_node_alloc(struct man *, int, int,
49 				enum man_type, enum mant);
50 static	int		 man_node_append(struct man *,
51 				struct man_node *);
52 static	void		 man_node_free(struct man_node *);
53 static	void		 man_node_unlink(struct man *,
54 				struct man_node *);
55 static	int		 man_ptext(struct man *, int, char *, int);
56 static	int		 man_pmacro(struct man *, int, char *, int);
57 static	void		 man_free1(struct man *);
58 static	void		 man_alloc1(struct man *);
59 static	int		 man_descope(struct man *, int, int);
60 
61 
62 const struct man_node *
63 man_node(const struct man *m)
64 {
65 
66 	assert( ! (MAN_HALT & m->flags));
67 	return(m->first);
68 }
69 
70 
71 const struct man_meta *
72 man_meta(const struct man *m)
73 {
74 
75 	assert( ! (MAN_HALT & m->flags));
76 	return(&m->meta);
77 }
78 
79 
80 void
81 man_reset(struct man *man)
82 {
83 
84 	man_free1(man);
85 	man_alloc1(man);
86 }
87 
88 
89 void
90 man_free(struct man *man)
91 {
92 
93 	man_free1(man);
94 	free(man);
95 }
96 
97 
98 struct man *
99 man_alloc(struct regset *regs, struct mparse *parse)
100 {
101 	struct man	*p;
102 
103 	p = mandoc_calloc(1, sizeof(struct man));
104 
105 	man_hash_init();
106 	p->parse = parse;
107 	p->regs = regs;
108 
109 	man_alloc1(p);
110 	return(p);
111 }
112 
113 
114 int
115 man_endparse(struct man *m)
116 {
117 
118 	assert( ! (MAN_HALT & m->flags));
119 	if (man_macroend(m))
120 		return(1);
121 	m->flags |= MAN_HALT;
122 	return(0);
123 }
124 
125 
126 int
127 man_parseln(struct man *m, int ln, char *buf, int offs)
128 {
129 
130 	m->flags |= MAN_NEWLINE;
131 
132 	assert( ! (MAN_HALT & m->flags));
133 
134 	return (mandoc_getcontrol(buf, &offs) ?
135 			man_pmacro(m, ln, buf, offs) :
136 			man_ptext(m, ln, buf, offs));
137 }
138 
139 
140 static void
141 man_free1(struct man *man)
142 {
143 
144 	if (man->first)
145 		man_node_delete(man, man->first);
146 	if (man->meta.title)
147 		free(man->meta.title);
148 	if (man->meta.source)
149 		free(man->meta.source);
150 	if (man->meta.date)
151 		free(man->meta.date);
152 	if (man->meta.vol)
153 		free(man->meta.vol);
154 	if (man->meta.msec)
155 		free(man->meta.msec);
156 }
157 
158 
159 static void
160 man_alloc1(struct man *m)
161 {
162 
163 	memset(&m->meta, 0, sizeof(struct man_meta));
164 	m->flags = 0;
165 	m->last = mandoc_calloc(1, sizeof(struct man_node));
166 	m->first = m->last;
167 	m->last->type = MAN_ROOT;
168 	m->last->tok = MAN_MAX;
169 	m->next = MAN_NEXT_CHILD;
170 }
171 
172 
173 static int
174 man_node_append(struct man *man, struct man_node *p)
175 {
176 
177 	assert(man->last);
178 	assert(man->first);
179 	assert(MAN_ROOT != p->type);
180 
181 	switch (man->next) {
182 	case (MAN_NEXT_SIBLING):
183 		man->last->next = p;
184 		p->prev = man->last;
185 		p->parent = man->last->parent;
186 		break;
187 	case (MAN_NEXT_CHILD):
188 		man->last->child = p;
189 		p->parent = man->last;
190 		break;
191 	default:
192 		abort();
193 		/* NOTREACHED */
194 	}
195 
196 	assert(p->parent);
197 	p->parent->nchild++;
198 
199 	if ( ! man_valid_pre(man, p))
200 		return(0);
201 
202 	switch (p->type) {
203 	case (MAN_HEAD):
204 		assert(MAN_BLOCK == p->parent->type);
205 		p->parent->head = p;
206 		break;
207 	case (MAN_TAIL):
208 		assert(MAN_BLOCK == p->parent->type);
209 		p->parent->tail = p;
210 		break;
211 	case (MAN_BODY):
212 		assert(MAN_BLOCK == p->parent->type);
213 		p->parent->body = p;
214 		break;
215 	default:
216 		break;
217 	}
218 
219 	man->last = p;
220 
221 	switch (p->type) {
222 	case (MAN_TBL):
223 		/* FALLTHROUGH */
224 	case (MAN_TEXT):
225 		if ( ! man_valid_post(man))
226 			return(0);
227 		break;
228 	default:
229 		break;
230 	}
231 
232 	return(1);
233 }
234 
235 
236 static struct man_node *
237 man_node_alloc(struct man *m, int line, int pos,
238 		enum man_type type, enum mant tok)
239 {
240 	struct man_node *p;
241 
242 	p = mandoc_calloc(1, sizeof(struct man_node));
243 	p->line = line;
244 	p->pos = pos;
245 	p->type = type;
246 	p->tok = tok;
247 
248 	if (MAN_NEWLINE & m->flags)
249 		p->flags |= MAN_LINE;
250 	m->flags &= ~MAN_NEWLINE;
251 	return(p);
252 }
253 
254 
255 int
256 man_elem_alloc(struct man *m, int line, int pos, enum mant tok)
257 {
258 	struct man_node *p;
259 
260 	p = man_node_alloc(m, line, pos, MAN_ELEM, tok);
261 	if ( ! man_node_append(m, p))
262 		return(0);
263 	m->next = MAN_NEXT_CHILD;
264 	return(1);
265 }
266 
267 
268 int
269 man_tail_alloc(struct man *m, int line, int pos, enum mant tok)
270 {
271 	struct man_node *p;
272 
273 	p = man_node_alloc(m, line, pos, MAN_TAIL, tok);
274 	if ( ! man_node_append(m, p))
275 		return(0);
276 	m->next = MAN_NEXT_CHILD;
277 	return(1);
278 }
279 
280 
281 int
282 man_head_alloc(struct man *m, int line, int pos, enum mant tok)
283 {
284 	struct man_node *p;
285 
286 	p = man_node_alloc(m, line, pos, MAN_HEAD, tok);
287 	if ( ! man_node_append(m, p))
288 		return(0);
289 	m->next = MAN_NEXT_CHILD;
290 	return(1);
291 }
292 
293 
294 int
295 man_body_alloc(struct man *m, int line, int pos, enum mant tok)
296 {
297 	struct man_node *p;
298 
299 	p = man_node_alloc(m, line, pos, MAN_BODY, tok);
300 	if ( ! man_node_append(m, p))
301 		return(0);
302 	m->next = MAN_NEXT_CHILD;
303 	return(1);
304 }
305 
306 
307 int
308 man_block_alloc(struct man *m, int line, int pos, enum mant tok)
309 {
310 	struct man_node *p;
311 
312 	p = man_node_alloc(m, line, pos, MAN_BLOCK, tok);
313 	if ( ! man_node_append(m, p))
314 		return(0);
315 	m->next = MAN_NEXT_CHILD;
316 	return(1);
317 }
318 
319 int
320 man_word_alloc(struct man *m, int line, int pos, const char *word)
321 {
322 	struct man_node	*n;
323 	size_t		 sv, len;
324 
325 	len = strlen(word);
326 
327 	n = man_node_alloc(m, line, pos, MAN_TEXT, MAN_MAX);
328 	n->string = mandoc_malloc(len + 1);
329 	sv = strlcpy(n->string, word, len + 1);
330 
331 	/* Prohibit truncation. */
332 	assert(sv < len + 1);
333 
334 	if ( ! man_node_append(m, n))
335 		return(0);
336 
337 	m->next = MAN_NEXT_SIBLING;
338 	return(1);
339 }
340 
341 
342 /*
343  * Free all of the resources held by a node.  This does NOT unlink a
344  * node from its context; for that, see man_node_unlink().
345  */
346 static void
347 man_node_free(struct man_node *p)
348 {
349 
350 	if (p->string)
351 		free(p->string);
352 	free(p);
353 }
354 
355 
356 void
357 man_node_delete(struct man *m, struct man_node *p)
358 {
359 
360 	while (p->child)
361 		man_node_delete(m, p->child);
362 
363 	man_node_unlink(m, p);
364 	man_node_free(p);
365 }
366 
367 int
368 man_addeqn(struct man *m, const struct eqn *ep)
369 {
370 	struct man_node	*n;
371 
372 	assert( ! (MAN_HALT & m->flags));
373 
374 	n = man_node_alloc(m, ep->line, ep->pos, MAN_EQN, MAN_MAX);
375 	n->eqn = ep;
376 
377 	if ( ! man_node_append(m, n))
378 		return(0);
379 
380 	m->next = MAN_NEXT_SIBLING;
381 	return(man_descope(m, ep->line, ep->pos));
382 }
383 
384 int
385 man_addspan(struct man *m, const struct tbl_span *sp)
386 {
387 	struct man_node	*n;
388 
389 	assert( ! (MAN_HALT & m->flags));
390 
391 	n = man_node_alloc(m, sp->line, 0, MAN_TBL, MAN_MAX);
392 	n->span = sp;
393 
394 	if ( ! man_node_append(m, n))
395 		return(0);
396 
397 	m->next = MAN_NEXT_SIBLING;
398 	return(man_descope(m, sp->line, 0));
399 }
400 
401 static int
402 man_descope(struct man *m, int line, int offs)
403 {
404 	/*
405 	 * Co-ordinate what happens with having a next-line scope open:
406 	 * first close out the element scope (if applicable), then close
407 	 * out the block scope (also if applicable).
408 	 */
409 
410 	if (MAN_ELINE & m->flags) {
411 		m->flags &= ~MAN_ELINE;
412 		if ( ! man_unscope(m, m->last->parent, MANDOCERR_MAX))
413 			return(0);
414 	}
415 
416 	if ( ! (MAN_BLINE & m->flags))
417 		return(1);
418 	m->flags &= ~MAN_BLINE;
419 
420 	if ( ! man_unscope(m, m->last->parent, MANDOCERR_MAX))
421 		return(0);
422 	return(man_body_alloc(m, line, offs, m->last->tok));
423 }
424 
425 static int
426 man_ptext(struct man *m, int line, char *buf, int offs)
427 {
428 	int		 i;
429 
430 	/* Literal free-form text whitespace is preserved. */
431 
432 	if (MAN_LITERAL & m->flags) {
433 		if ( ! man_word_alloc(m, line, offs, buf + offs))
434 			return(0);
435 		return(man_descope(m, line, offs));
436 	}
437 
438 	/* Pump blank lines directly into the backend. */
439 
440 	for (i = offs; ' ' == buf[i]; i++)
441 		/* Skip leading whitespace. */ ;
442 
443 	if ('\0' == buf[i]) {
444 		/* Allocate a blank entry. */
445 		if ( ! man_word_alloc(m, line, offs, ""))
446 			return(0);
447 		return(man_descope(m, line, offs));
448 	}
449 
450 	/*
451 	 * Warn if the last un-escaped character is whitespace. Then
452 	 * strip away the remaining spaces (tabs stay!).
453 	 */
454 
455 	i = (int)strlen(buf);
456 	assert(i);
457 
458 	if (' ' == buf[i - 1] || '\t' == buf[i - 1]) {
459 		if (i > 1 && '\\' != buf[i - 2])
460 			man_pmsg(m, line, i - 1, MANDOCERR_EOLNSPACE);
461 
462 		for (--i; i && ' ' == buf[i]; i--)
463 			/* Spin back to non-space. */ ;
464 
465 		/* Jump ahead of escaped whitespace. */
466 		i += '\\' == buf[i] ? 2 : 1;
467 
468 		buf[i] = '\0';
469 	}
470 
471 	if ( ! man_word_alloc(m, line, offs, buf + offs))
472 		return(0);
473 
474 	/*
475 	 * End-of-sentence check.  If the last character is an unescaped
476 	 * EOS character, then flag the node as being the end of a
477 	 * sentence.  The front-end will know how to interpret this.
478 	 */
479 
480 	assert(i);
481 	if (mandoc_eos(buf, (size_t)i, 0))
482 		m->last->flags |= MAN_EOS;
483 
484 	return(man_descope(m, line, offs));
485 }
486 
487 static int
488 man_pmacro(struct man *m, int ln, char *buf, int offs)
489 {
490 	int		 i, ppos;
491 	enum mant	 tok;
492 	char		 mac[5];
493 	struct man_node	*n;
494 
495 	if ('"' == buf[offs]) {
496 		man_pmsg(m, ln, offs, MANDOCERR_BADCOMMENT);
497 		return(1);
498 	} else if ('\0' == buf[offs])
499 		return(1);
500 
501 	ppos = offs;
502 
503 	/*
504 	 * Copy the first word into a nil-terminated buffer.
505 	 * Stop copying when a tab, space, or eoln is encountered.
506 	 */
507 
508 	i = 0;
509 	while (i < 4 && '\0' != buf[offs] &&
510 			' ' != buf[offs] && '\t' != buf[offs])
511 		mac[i++] = buf[offs++];
512 
513 	mac[i] = '\0';
514 
515 	tok = (i > 0 && i < 4) ? man_hash_find(mac) : MAN_MAX;
516 
517 	if (MAN_MAX == tok) {
518 		mandoc_vmsg(MANDOCERR_MACRO, m->parse, ln,
519 				ppos, "%s", buf + ppos - 1);
520 		return(1);
521 	}
522 
523 	/* The macro is sane.  Jump to the next word. */
524 
525 	while (buf[offs] && ' ' == buf[offs])
526 		offs++;
527 
528 	/*
529 	 * Trailing whitespace.  Note that tabs are allowed to be passed
530 	 * into the parser as "text", so we only warn about spaces here.
531 	 */
532 
533 	if ('\0' == buf[offs] && ' ' == buf[offs - 1])
534 		man_pmsg(m, ln, offs - 1, MANDOCERR_EOLNSPACE);
535 
536 	/*
537 	 * Remove prior ELINE macro, as it's being clobbered by a new
538 	 * macro.  Note that NSCOPED macros do not close out ELINE
539 	 * macros---they don't print text---so we let those slip by.
540 	 */
541 
542 	if ( ! (MAN_NSCOPED & man_macros[tok].flags) &&
543 			m->flags & MAN_ELINE) {
544 		n = m->last;
545 		assert(MAN_TEXT != n->type);
546 
547 		/* Remove repeated NSCOPED macros causing ELINE. */
548 
549 		if (MAN_NSCOPED & man_macros[n->tok].flags)
550 			n = n->parent;
551 
552 		mandoc_vmsg(MANDOCERR_LINESCOPE, m->parse, n->line,
553 				n->pos, "%s", man_macronames[n->tok]);
554 
555 		man_node_delete(m, n);
556 		m->flags &= ~MAN_ELINE;
557 	}
558 
559 	/*
560 	 * Save the fact that we're in the next-line for a block.  In
561 	 * this way, embedded roff instructions can "remember" state
562 	 * when they exit.
563 	 */
564 
565 	if (MAN_BLINE & m->flags)
566 		m->flags |= MAN_BPLINE;
567 
568 	/* Call to handler... */
569 
570 	assert(man_macros[tok].fp);
571 	if ( ! (*man_macros[tok].fp)(m, tok, ln, ppos, &offs, buf))
572 		goto err;
573 
574 	/*
575 	 * We weren't in a block-line scope when entering the
576 	 * above-parsed macro, so return.
577 	 */
578 
579 	if ( ! (MAN_BPLINE & m->flags)) {
580 		m->flags &= ~MAN_ILINE;
581 		return(1);
582 	}
583 	m->flags &= ~MAN_BPLINE;
584 
585 	/*
586 	 * If we're in a block scope, then allow this macro to slip by
587 	 * without closing scope around it.
588 	 */
589 
590 	if (MAN_ILINE & m->flags) {
591 		m->flags &= ~MAN_ILINE;
592 		return(1);
593 	}
594 
595 	/*
596 	 * If we've opened a new next-line element scope, then return
597 	 * now, as the next line will close out the block scope.
598 	 */
599 
600 	if (MAN_ELINE & m->flags)
601 		return(1);
602 
603 	/* Close out the block scope opened in the prior line.  */
604 
605 	assert(MAN_BLINE & m->flags);
606 	m->flags &= ~MAN_BLINE;
607 
608 	if ( ! man_unscope(m, m->last->parent, MANDOCERR_MAX))
609 		return(0);
610 	return(man_body_alloc(m, ln, ppos, m->last->tok));
611 
612 err:	/* Error out. */
613 
614 	m->flags |= MAN_HALT;
615 	return(0);
616 }
617 
618 /*
619  * Unlink a node from its context.  If "m" is provided, the last parse
620  * point will also be adjusted accordingly.
621  */
622 static void
623 man_node_unlink(struct man *m, struct man_node *n)
624 {
625 
626 	/* Adjust siblings. */
627 
628 	if (n->prev)
629 		n->prev->next = n->next;
630 	if (n->next)
631 		n->next->prev = n->prev;
632 
633 	/* Adjust parent. */
634 
635 	if (n->parent) {
636 		n->parent->nchild--;
637 		if (n->parent->child == n)
638 			n->parent->child = n->prev ? n->prev : n->next;
639 	}
640 
641 	/* Adjust parse point, if applicable. */
642 
643 	if (m && m->last == n) {
644 		/*XXX: this can occur when bailing from validation. */
645 		/*assert(NULL == n->next);*/
646 		if (n->prev) {
647 			m->last = n->prev;
648 			m->next = MAN_NEXT_SIBLING;
649 		} else {
650 			m->last = n->parent;
651 			m->next = MAN_NEXT_CHILD;
652 		}
653 	}
654 
655 	if (m && m->first == n)
656 		m->first = NULL;
657 }
658