xref: /illumos-gate/usr/src/cmd/mandoc/mdoc.c (revision 7855d95b30fd903e3918bad5a29b777e765db821) 
1 /*	$Id: mdoc.c,v 1.256 2015/10/30 19:04:16 schwarze Exp $ */
2 /*
3  * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
4  * Copyright (c) 2010, 2012-2015 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 
22 #include <assert.h>
23 #include <ctype.h>
24 #include <stdarg.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <time.h>
29 
30 #include "mandoc_aux.h"
31 #include "mandoc.h"
32 #include "roff.h"
33 #include "mdoc.h"
34 #include "libmandoc.h"
35 #include "roff_int.h"
36 #include "libmdoc.h"
37 
38 const	char *const __mdoc_macronames[MDOC_MAX + 1] = {
39 	"text",
40 	"Ap",		"Dd",		"Dt",		"Os",
41 	"Sh",		"Ss",		"Pp",		"D1",
42 	"Dl",		"Bd",		"Ed",		"Bl",
43 	"El",		"It",		"Ad",		"An",
44 	"Ar",		"Cd",		"Cm",		"Dv",
45 	"Er",		"Ev",		"Ex",		"Fa",
46 	"Fd",		"Fl",		"Fn",		"Ft",
47 	"Ic",		"In",		"Li",		"Nd",
48 	"Nm",		"Op",		"Ot",		"Pa",
49 	"Rv",		"St",		"Va",		"Vt",
50 	"Xr",		"%A",		"%B",		"%D",
51 	"%I",		"%J",		"%N",		"%O",
52 	"%P",		"%R",		"%T",		"%V",
53 	"Ac",		"Ao",		"Aq",		"At",
54 	"Bc",		"Bf",		"Bo",		"Bq",
55 	"Bsx",		"Bx",		"Db",		"Dc",
56 	"Do",		"Dq",		"Ec",		"Ef",
57 	"Em",		"Eo",		"Fx",		"Ms",
58 	"No",		"Ns",		"Nx",		"Ox",
59 	"Pc",		"Pf",		"Po",		"Pq",
60 	"Qc",		"Ql",		"Qo",		"Qq",
61 	"Re",		"Rs",		"Sc",		"So",
62 	"Sq",		"Sm",		"Sx",		"Sy",
63 	"Tn",		"Ux",		"Xc",		"Xo",
64 	"Fo",		"Fc",		"Oo",		"Oc",
65 	"Bk",		"Ek",		"Bt",		"Hf",
66 	"Fr",		"Ud",		"Lb",		"Lp",
67 	"Lk",		"Mt",		"Brq",		"Bro",
68 	"Brc",		"%C",		"Es",		"En",
69 	"Dx",		"%Q",		"br",		"sp",
70 	"%U",		"Ta",		"ll",
71 };
72 
73 const	char *const __mdoc_argnames[MDOC_ARG_MAX] = {
74 	"split",		"nosplit",		"ragged",
75 	"unfilled",		"literal",		"file",
76 	"offset",		"bullet",		"dash",
77 	"hyphen",		"item",			"enum",
78 	"tag",			"diag",			"hang",
79 	"ohang",		"inset",		"column",
80 	"width",		"compact",		"std",
81 	"filled",		"words",		"emphasis",
82 	"symbolic",		"nested",		"centered"
83 	};
84 
85 const	char * const *mdoc_macronames = __mdoc_macronames + 1;
86 const	char * const *mdoc_argnames = __mdoc_argnames;
87 
88 static	int		  mdoc_ptext(struct roff_man *, int, char *, int);
89 static	int		  mdoc_pmacro(struct roff_man *, int, char *, int);
90 
91 
92 /*
93  * Main parse routine.  Parses a single line -- really just hands off to
94  * the macro (mdoc_pmacro()) or text parser (mdoc_ptext()).
95  */
96 int
97 mdoc_parseln(struct roff_man *mdoc, int ln, char *buf, int offs)
98 {
99 
100 	if (mdoc->last->type != ROFFT_EQN || ln > mdoc->last->line)
101 		mdoc->flags |= MDOC_NEWLINE;
102 
103 	/*
104 	 * Let the roff nS register switch SYNOPSIS mode early,
105 	 * such that the parser knows at all times
106 	 * whether this mode is on or off.
107 	 * Note that this mode is also switched by the Sh macro.
108 	 */
109 	if (roff_getreg(mdoc->roff, "nS"))
110 		mdoc->flags |= MDOC_SYNOPSIS;
111 	else
112 		mdoc->flags &= ~MDOC_SYNOPSIS;
113 
114 	return roff_getcontrol(mdoc->roff, buf, &offs) ?
115 	    mdoc_pmacro(mdoc, ln, buf, offs) :
116 	    mdoc_ptext(mdoc, ln, buf, offs);
117 }
118 
119 void
120 mdoc_macro(MACRO_PROT_ARGS)
121 {
122 	assert(tok > TOKEN_NONE && tok < MDOC_MAX);
123 
124 	(*mdoc_macros[tok].fp)(mdoc, tok, line, ppos, pos, buf);
125 }
126 
127 void
128 mdoc_tail_alloc(struct roff_man *mdoc, int line, int pos, int tok)
129 {
130 	struct roff_node *p;
131 
132 	p = roff_node_alloc(mdoc, line, pos, ROFFT_TAIL, tok);
133 	roff_node_append(mdoc, p);
134 	mdoc->next = ROFF_NEXT_CHILD;
135 }
136 
137 struct roff_node *
138 mdoc_endbody_alloc(struct roff_man *mdoc, int line, int pos, int tok,
139 		struct roff_node *body, enum mdoc_endbody end)
140 {
141 	struct roff_node *p;
142 
143 	body->flags |= MDOC_ENDED;
144 	body->parent->flags |= MDOC_ENDED;
145 	p = roff_node_alloc(mdoc, line, pos, ROFFT_BODY, tok);
146 	p->body = body;
147 	p->norm = body->norm;
148 	p->end = end;
149 	roff_node_append(mdoc, p);
150 	mdoc->next = ROFF_NEXT_SIBLING;
151 	return p;
152 }
153 
154 struct roff_node *
155 mdoc_block_alloc(struct roff_man *mdoc, int line, int pos,
156 	int tok, struct mdoc_arg *args)
157 {
158 	struct roff_node *p;
159 
160 	p = roff_node_alloc(mdoc, line, pos, ROFFT_BLOCK, tok);
161 	p->args = args;
162 	if (p->args)
163 		(args->refcnt)++;
164 
165 	switch (tok) {
166 	case MDOC_Bd:
167 	case MDOC_Bf:
168 	case MDOC_Bl:
169 	case MDOC_En:
170 	case MDOC_Rs:
171 		p->norm = mandoc_calloc(1, sizeof(union mdoc_data));
172 		break;
173 	default:
174 		break;
175 	}
176 	roff_node_append(mdoc, p);
177 	mdoc->next = ROFF_NEXT_CHILD;
178 	return p;
179 }
180 
181 void
182 mdoc_elem_alloc(struct roff_man *mdoc, int line, int pos,
183 	int tok, struct mdoc_arg *args)
184 {
185 	struct roff_node *p;
186 
187 	p = roff_node_alloc(mdoc, line, pos, ROFFT_ELEM, tok);
188 	p->args = args;
189 	if (p->args)
190 		(args->refcnt)++;
191 
192 	switch (tok) {
193 	case MDOC_An:
194 		p->norm = mandoc_calloc(1, sizeof(union mdoc_data));
195 		break;
196 	default:
197 		break;
198 	}
199 	roff_node_append(mdoc, p);
200 	mdoc->next = ROFF_NEXT_CHILD;
201 }
202 
203 void
204 mdoc_node_relink(struct roff_man *mdoc, struct roff_node *p)
205 {
206 
207 	roff_node_unlink(mdoc, p);
208 	p->prev = p->next = NULL;
209 	roff_node_append(mdoc, p);
210 }
211 
212 /*
213  * Parse free-form text, that is, a line that does not begin with the
214  * control character.
215  */
216 static int
217 mdoc_ptext(struct roff_man *mdoc, int line, char *buf, int offs)
218 {
219 	struct roff_node *n;
220 	char		 *c, *ws, *end;
221 
222 	assert(mdoc->last);
223 	n = mdoc->last;
224 
225 	/*
226 	 * Divert directly to list processing if we're encountering a
227 	 * columnar ROFFT_BLOCK with or without a prior ROFFT_BLOCK entry
228 	 * (a ROFFT_BODY means it's already open, in which case we should
229 	 * process within its context in the normal way).
230 	 */
231 
232 	if (n->tok == MDOC_Bl && n->type == ROFFT_BODY &&
233 	    n->end == ENDBODY_NOT && n->norm->Bl.type == LIST_column) {
234 		/* `Bl' is open without any children. */
235 		mdoc->flags |= MDOC_FREECOL;
236 		mdoc_macro(mdoc, MDOC_It, line, offs, &offs, buf);
237 		return 1;
238 	}
239 
240 	if (n->tok == MDOC_It && n->type == ROFFT_BLOCK &&
241 	    NULL != n->parent &&
242 	    MDOC_Bl == n->parent->tok &&
243 	    LIST_column == n->parent->norm->Bl.type) {
244 		/* `Bl' has block-level `It' children. */
245 		mdoc->flags |= MDOC_FREECOL;
246 		mdoc_macro(mdoc, MDOC_It, line, offs, &offs, buf);
247 		return 1;
248 	}
249 
250 	/*
251 	 * Search for the beginning of unescaped trailing whitespace (ws)
252 	 * and for the first character not to be output (end).
253 	 */
254 
255 	/* FIXME: replace with strcspn(). */
256 	ws = NULL;
257 	for (c = end = buf + offs; *c; c++) {
258 		switch (*c) {
259 		case ' ':
260 			if (NULL == ws)
261 				ws = c;
262 			continue;
263 		case '\t':
264 			/*
265 			 * Always warn about trailing tabs,
266 			 * even outside literal context,
267 			 * where they should be put on the next line.
268 			 */
269 			if (NULL == ws)
270 				ws = c;
271 			/*
272 			 * Strip trailing tabs in literal context only;
273 			 * outside, they affect the next line.
274 			 */
275 			if (MDOC_LITERAL & mdoc->flags)
276 				continue;
277 			break;
278 		case '\\':
279 			/* Skip the escaped character, too, if any. */
280 			if (c[1])
281 				c++;
282 			/* FALLTHROUGH */
283 		default:
284 			ws = NULL;
285 			break;
286 		}
287 		end = c + 1;
288 	}
289 	*end = '\0';
290 
291 	if (ws)
292 		mandoc_msg(MANDOCERR_SPACE_EOL, mdoc->parse,
293 		    line, (int)(ws-buf), NULL);
294 
295 	if (buf[offs] == '\0' && ! (mdoc->flags & MDOC_LITERAL)) {
296 		mandoc_msg(MANDOCERR_FI_BLANK, mdoc->parse,
297 		    line, (int)(c - buf), NULL);
298 
299 		/*
300 		 * Insert a `sp' in the case of a blank line.  Technically,
301 		 * blank lines aren't allowed, but enough manuals assume this
302 		 * behaviour that we want to work around it.
303 		 */
304 		roff_elem_alloc(mdoc, line, offs, MDOC_sp);
305 		mdoc->last->flags |= MDOC_VALID | MDOC_ENDED;
306 		mdoc->next = ROFF_NEXT_SIBLING;
307 		return 1;
308 	}
309 
310 	roff_word_alloc(mdoc, line, offs, buf+offs);
311 
312 	if (mdoc->flags & MDOC_LITERAL)
313 		return 1;
314 
315 	/*
316 	 * End-of-sentence check.  If the last character is an unescaped
317 	 * EOS character, then flag the node as being the end of a
318 	 * sentence.  The front-end will know how to interpret this.
319 	 */
320 
321 	assert(buf < end);
322 
323 	if (mandoc_eos(buf+offs, (size_t)(end-buf-offs)))
324 		mdoc->last->flags |= MDOC_EOS;
325 	return 1;
326 }
327 
328 /*
329  * Parse a macro line, that is, a line beginning with the control
330  * character.
331  */
332 static int
333 mdoc_pmacro(struct roff_man *mdoc, int ln, char *buf, int offs)
334 {
335 	struct roff_node *n;
336 	const char	 *cp;
337 	int		  tok;
338 	int		  i, sv;
339 	char		  mac[5];
340 
341 	sv = offs;
342 
343 	/*
344 	 * Copy the first word into a nil-terminated buffer.
345 	 * Stop when a space, tab, escape, or eoln is encountered.
346 	 */
347 
348 	i = 0;
349 	while (i < 4 && strchr(" \t\\", buf[offs]) == NULL)
350 		mac[i++] = buf[offs++];
351 
352 	mac[i] = '\0';
353 
354 	tok = (i > 1 && i < 4) ? mdoc_hash_find(mac) : TOKEN_NONE;
355 
356 	if (tok == TOKEN_NONE) {
357 		mandoc_msg(MANDOCERR_MACRO, mdoc->parse,
358 		    ln, sv, buf + sv - 1);
359 		return 1;
360 	}
361 
362 	/* Skip a leading escape sequence or tab. */
363 
364 	switch (buf[offs]) {
365 	case '\\':
366 		cp = buf + offs + 1;
367 		mandoc_escape(&cp, NULL, NULL);
368 		offs = cp - buf;
369 		break;
370 	case '\t':
371 		offs++;
372 		break;
373 	default:
374 		break;
375 	}
376 
377 	/* Jump to the next non-whitespace word. */
378 
379 	while (buf[offs] && ' ' == buf[offs])
380 		offs++;
381 
382 	/*
383 	 * Trailing whitespace.  Note that tabs are allowed to be passed
384 	 * into the parser as "text", so we only warn about spaces here.
385 	 */
386 
387 	if ('\0' == buf[offs] && ' ' == buf[offs - 1])
388 		mandoc_msg(MANDOCERR_SPACE_EOL, mdoc->parse,
389 		    ln, offs - 1, NULL);
390 
391 	/*
392 	 * If an initial macro or a list invocation, divert directly
393 	 * into macro processing.
394 	 */
395 
396 	if (NULL == mdoc->last || MDOC_It == tok || MDOC_El == tok) {
397 		mdoc_macro(mdoc, tok, ln, sv, &offs, buf);
398 		return 1;
399 	}
400 
401 	n = mdoc->last;
402 	assert(mdoc->last);
403 
404 	/*
405 	 * If the first macro of a `Bl -column', open an `It' block
406 	 * context around the parsed macro.
407 	 */
408 
409 	if (n->tok == MDOC_Bl && n->type == ROFFT_BODY &&
410 	    n->end == ENDBODY_NOT && n->norm->Bl.type == LIST_column) {
411 		mdoc->flags |= MDOC_FREECOL;
412 		mdoc_macro(mdoc, MDOC_It, ln, sv, &sv, buf);
413 		return 1;
414 	}
415 
416 	/*
417 	 * If we're following a block-level `It' within a `Bl -column'
418 	 * context (perhaps opened in the above block or in ptext()),
419 	 * then open an `It' block context around the parsed macro.
420 	 */
421 
422 	if (n->tok == MDOC_It && n->type == ROFFT_BLOCK &&
423 	    NULL != n->parent &&
424 	    MDOC_Bl == n->parent->tok &&
425 	    LIST_column == n->parent->norm->Bl.type) {
426 		mdoc->flags |= MDOC_FREECOL;
427 		mdoc_macro(mdoc, MDOC_It, ln, sv, &sv, buf);
428 		return 1;
429 	}
430 
431 	/* Normal processing of a macro. */
432 
433 	mdoc_macro(mdoc, tok, ln, sv, &offs, buf);
434 
435 	/* In quick mode (for mandocdb), abort after the NAME section. */
436 
437 	if (mdoc->quick && MDOC_Sh == tok &&
438 	    SEC_NAME != mdoc->last->sec)
439 		return 2;
440 
441 	return 1;
442 }
443 
444 enum mdelim
445 mdoc_isdelim(const char *p)
446 {
447 
448 	if ('\0' == p[0])
449 		return DELIM_NONE;
450 
451 	if ('\0' == p[1])
452 		switch (p[0]) {
453 		case '(':
454 		case '[':
455 			return DELIM_OPEN;
456 		case '|':
457 			return DELIM_MIDDLE;
458 		case '.':
459 		case ',':
460 		case ';':
461 		case ':':
462 		case '?':
463 		case '!':
464 		case ')':
465 		case ']':
466 			return DELIM_CLOSE;
467 		default:
468 			return DELIM_NONE;
469 		}
470 
471 	if ('\\' != p[0])
472 		return DELIM_NONE;
473 
474 	if (0 == strcmp(p + 1, "."))
475 		return DELIM_CLOSE;
476 	if (0 == strcmp(p + 1, "fR|\\fP"))
477 		return DELIM_MIDDLE;
478 
479 	return DELIM_NONE;
480 }
481 
482 void
483 mdoc_validate(struct roff_man *mdoc)
484 {
485 
486 	mdoc->last = mdoc->first;
487 	mdoc_node_validate(mdoc);
488 	mdoc_state_reset(mdoc);
489 }
490