1 /* $Id: tbl_layout.c,v 1.22 2011/09/18 14:14:15 schwarze Exp $ */
3 * Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
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.
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.
28 #include "libmandoc.h"
37 * FIXME: we can make this parse a lot nicer by, when an error is
38 * encountered in a layout key, bailing to the next key (i.e. to the
39 * next whitespace then continuing).
44 static const struct tbl_phrase keys[KEYS_MAX] = {
45 { 'c', TBL_CELL_CENTRE },
46 { 'r', TBL_CELL_RIGHT },
47 { 'l', TBL_CELL_LEFT },
48 { 'n', TBL_CELL_NUMBER },
49 { 's', TBL_CELL_SPAN },
50 { 'a', TBL_CELL_LONG },
51 { '^', TBL_CELL_DOWN },
52 { '-', TBL_CELL_HORIZ },
53 { '_', TBL_CELL_HORIZ },
54 { '=', TBL_CELL_DHORIZ },
55 { '|', TBL_CELL_VERT }
58 static int mods(struct tbl_node *, struct tbl_cell *,
59 int, const char *, int *);
60 static int cell(struct tbl_node *, struct tbl_row *,
61 int, const char *, int *);
62 static void row(struct tbl_node *, int, const char *, int *);
63 static struct tbl_cell *cell_alloc(struct tbl_node *,
64 struct tbl_row *, enum tbl_cellt);
65 static void head_adjust(const struct tbl_cell *,
69 mods(struct tbl_node *tbl, struct tbl_cell *cp,
70 int ln, const char *p, int *pos)
75 /* Not all types accept modifiers. */
80 case (TBL_CELL_HORIZ):
82 case (TBL_CELL_DHORIZ):
86 case (TBL_CELL_DVERT):
94 * XXX: since, at least for now, modifiers are non-conflicting
95 * (are separable by value, regardless of position), we let
96 * modifiers come in any order. The existing tbl doesn't let
114 /* Throw away parenthesised expression. */
116 if ('(' == p[*pos]) {
118 while (p[*pos] && ')' != p[*pos])
120 if (')' == p[*pos]) {
124 mandoc_msg(MANDOCERR_TBLLAYOUT,
125 tbl->parse, ln, *pos, NULL);
129 /* Parse numerical spacing from modifier string. */
131 if (isdigit((unsigned char)p[*pos])) {
132 for (i = 0; i < 4; i++) {
133 if ( ! isdigit((unsigned char)p[*pos + i]))
135 buf[i] = p[*pos + i];
139 /* No greater than 4 digits. */
142 mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
148 cp->spacing = (size_t)atoi(buf);
154 /* TODO: GNU has many more extensions. */
156 switch (tolower((unsigned char)p[(*pos)++])) {
158 cp->flags |= TBL_CELL_WIGN;
161 cp->flags |= TBL_CELL_UP;
164 cp->flags |= TBL_CELL_EQUAL;
167 cp->flags |= TBL_CELL_TALIGN;
170 cp->flags |= TBL_CELL_BALIGN;
172 case ('w'): /* XXX for now, ignore minimal column width */
184 mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
189 switch (tolower((unsigned char)p[(*pos)++])) {
193 cp->flags |= TBL_CELL_BOLD;
198 cp->flags |= TBL_CELL_ITALIC;
208 mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
214 cell(struct tbl_node *tbl, struct tbl_row *rp,
215 int ln, const char *p, int *pos)
220 /* Parse the column position (`r', `R', `|', ...). */
222 for (i = 0; i < KEYS_MAX; i++)
223 if (tolower((unsigned char)p[*pos]) == keys[i].name)
227 mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
235 * If a span cell is found first, raise a warning and abort the
236 * parse. If a span cell is found and the last layout element
237 * isn't a "normal" layout, bail.
239 * FIXME: recover from this somehow?
242 if (TBL_CELL_SPAN == c) {
243 if (NULL == rp->first) {
244 mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
248 switch (rp->last->pos) {
249 case (TBL_CELL_VERT):
250 case (TBL_CELL_DVERT):
251 case (TBL_CELL_HORIZ):
252 case (TBL_CELL_DHORIZ):
253 mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
262 * If a vertical spanner is found, we may not be in the first
266 if (TBL_CELL_DOWN == c && rp == tbl->first_row) {
267 mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse, ln, *pos, NULL);
273 /* Extra check for the double-vertical. */
275 if (TBL_CELL_VERT == c && '|' == p[*pos]) {
280 /* Disallow adjacent spacers. */
282 if (rp->last && (TBL_CELL_VERT == c || TBL_CELL_DVERT == c) &&
283 (TBL_CELL_VERT == rp->last->pos ||
284 TBL_CELL_DVERT == rp->last->pos)) {
285 mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse, ln, *pos - 1, NULL);
289 /* Allocate cell then parse its modifiers. */
291 return(mods(tbl, cell_alloc(tbl, rp, c), ln, p, pos));
296 row(struct tbl_node *tbl, int ln, const char *p, int *pos)
301 * EBNF describing this section:
303 * row ::= row_list [:space:]* [.]?[\n]
304 * row_list ::= [:space:]* row_elem row_tail
305 * row_tail ::= [:space:]*[,] row_list |
307 * row_elem ::= [\t\ ]*[:alpha:]+
310 rp = mandoc_calloc(1, sizeof(struct tbl_row));
312 tbl->last_row->next = rp;
315 tbl->last_row = tbl->first_row = rp;
318 while (isspace((unsigned char)p[*pos]))
321 /* Safely exit layout context. */
323 if ('.' == p[*pos]) {
324 tbl->part = TBL_PART_DATA;
325 if (NULL == tbl->first_row)
326 mandoc_msg(MANDOCERR_TBLNOLAYOUT, tbl->parse,
332 /* End (and possibly restart) a row. */
334 if (',' == p[*pos]) {
337 } else if ('\0' == p[*pos])
340 if ( ! cell(tbl, rp, ln, p, pos))
348 tbl_layout(struct tbl_node *tbl, int ln, const char *p)
353 row(tbl, ln, p, &pos);
355 /* Always succeed. */
359 static struct tbl_cell *
360 cell_alloc(struct tbl_node *tbl, struct tbl_row *rp, enum tbl_cellt pos)
362 struct tbl_cell *p, *pp;
363 struct tbl_head *h, *hp;
365 p = mandoc_calloc(1, sizeof(struct tbl_cell));
367 if (NULL != (pp = rp->last)) {
371 rp->last = rp->first = p;
376 * This is a little bit complicated. Here we determine the
377 * header the corresponds to a cell. We add headers dynamically
378 * when need be or re-use them, otherwise. As an example, given
386 * We first add the new headers (as there are none) in (1); then
387 * in (2) we insert the first spanner (as it doesn't match up
388 * with the header); then we re-use the prior data headers,
389 * skipping over the spanners; then we re-use everything and add
390 * a last spanner. Note that VERT headers are made into DVERT
394 h = pp ? pp->head->next : tbl->first_head;
397 /* Re-use data header. */
398 if (TBL_HEAD_DATA == h->pos &&
399 (TBL_CELL_VERT != p->pos &&
400 TBL_CELL_DVERT != p->pos)) {
405 /* Re-use spanner header. */
406 if (TBL_HEAD_DATA != h->pos &&
407 (TBL_CELL_VERT == p->pos ||
408 TBL_CELL_DVERT == p->pos)) {
414 /* Right-shift headers with a new spanner. */
415 if (TBL_HEAD_DATA == h->pos &&
416 (TBL_CELL_VERT == p->pos ||
417 TBL_CELL_DVERT == p->pos)) {
418 hp = mandoc_calloc(1, sizeof(struct tbl_head));
419 hp->ident = tbl->opts.cols++;
423 if (h == tbl->first_head)
424 tbl->first_head = hp;
432 if (NULL != (h = h->next)) {
438 /* Fall through to default case... */
441 hp = mandoc_calloc(1, sizeof(struct tbl_head));
442 hp->ident = tbl->opts.cols++;
444 if (tbl->last_head) {
445 hp->prev = tbl->last_head;
446 tbl->last_head->next = hp;
449 tbl->last_head = tbl->first_head = hp;
457 head_adjust(const struct tbl_cell *cellp, struct tbl_head *head)
459 if (TBL_CELL_VERT != cellp->pos &&
460 TBL_CELL_DVERT != cellp->pos) {
461 head->pos = TBL_HEAD_DATA;
465 if (TBL_CELL_VERT == cellp->pos)
466 if (TBL_HEAD_DVERT != head->pos)
467 head->pos = TBL_HEAD_VERT;
469 if (TBL_CELL_DVERT == cellp->pos)
470 head->pos = TBL_HEAD_DVERT;