1 /* $Id: tbl_layout.c,v 1.23 2012/05/27 17:54:54 schwarze Exp $ */
3 * Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
4 * Copyright (c) 2012 Ingo Schwarze <schwarze@openbsd.org>
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.
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR 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.
29 #include "libmandoc.h"
38 * FIXME: we can make this parse a lot nicer by, when an error is
39 * encountered in a layout key, bailing to the next key (i.e. to the
40 * next whitespace then continuing).
45 static const struct tbl_phrase keys[KEYS_MAX] = {
46 { 'c', TBL_CELL_CENTRE },
47 { 'r', TBL_CELL_RIGHT },
48 { 'l', TBL_CELL_LEFT },
49 { 'n', TBL_CELL_NUMBER },
50 { 's', TBL_CELL_SPAN },
51 { 'a', TBL_CELL_LONG },
52 { '^', TBL_CELL_DOWN },
53 { '-', TBL_CELL_HORIZ },
54 { '_', TBL_CELL_HORIZ },
55 { '=', TBL_CELL_DHORIZ }
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 *, struct tbl_row *,
64 enum tbl_cellt, int vert);
67 mods(struct tbl_node *tbl, struct tbl_cell *cp,
68 int ln, const char *p, int *pos)
73 /* Not all types accept modifiers. */
78 case (TBL_CELL_HORIZ):
80 case (TBL_CELL_DHORIZ):
88 * XXX: since, at least for now, modifiers are non-conflicting
89 * (are separable by value, regardless of position), we let
90 * modifiers come in any order. The existing tbl doesn't let
108 /* Throw away parenthesised expression. */
110 if ('(' == p[*pos]) {
112 while (p[*pos] && ')' != p[*pos])
114 if (')' == p[*pos]) {
118 mandoc_msg(MANDOCERR_TBLLAYOUT,
119 tbl->parse, ln, *pos, NULL);
123 /* Parse numerical spacing from modifier string. */
125 if (isdigit((unsigned char)p[*pos])) {
126 for (i = 0; i < 4; i++) {
127 if ( ! isdigit((unsigned char)p[*pos + i]))
129 buf[i] = p[*pos + i];
133 /* No greater than 4 digits. */
136 mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
142 cp->spacing = (size_t)atoi(buf);
148 /* TODO: GNU has many more extensions. */
150 switch (tolower((unsigned char)p[(*pos)++])) {
152 cp->flags |= TBL_CELL_WIGN;
155 cp->flags |= TBL_CELL_UP;
158 cp->flags |= TBL_CELL_EQUAL;
161 cp->flags |= TBL_CELL_TALIGN;
164 cp->flags |= TBL_CELL_BALIGN;
166 case ('w'): /* XXX for now, ignore minimal column width */
178 mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
183 switch (tolower((unsigned char)p[(*pos)++])) {
187 cp->flags |= TBL_CELL_BOLD;
192 cp->flags |= TBL_CELL_ITALIC;
202 mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
208 cell(struct tbl_node *tbl, struct tbl_row *rp,
209 int ln, const char *p, int *pos)
214 /* Handle vertical lines. */
216 for (vert = 0; '|' == p[*pos]; ++*pos)
218 while (' ' == p[*pos])
221 /* Parse the column position (`c', `l', `r', ...). */
223 for (i = 0; i < KEYS_MAX; i++)
224 if (tolower((unsigned char)p[*pos]) == keys[i].name)
228 mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
236 * If a span cell is found first, raise a warning and abort the
237 * parse. If a span cell is found and the last layout element
238 * isn't a "normal" layout, bail.
240 * FIXME: recover from this somehow?
243 if (TBL_CELL_SPAN == c) {
244 if (NULL == rp->first) {
245 mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
249 switch (rp->last->pos) {
250 case (TBL_CELL_HORIZ):
251 case (TBL_CELL_DHORIZ):
252 mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
261 * If a vertical spanner is found, we may not be in the first
265 if (TBL_CELL_DOWN == c && rp == tbl->first_row) {
266 mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse, ln, *pos, NULL);
272 /* Disallow adjacent spacers. */
275 mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse, ln, *pos - 1, NULL);
279 /* Allocate cell then parse its modifiers. */
281 return(mods(tbl, cell_alloc(tbl, rp, c, vert), ln, p, pos));
286 row(struct tbl_node *tbl, int ln, const char *p, int *pos)
291 * EBNF describing this section:
293 * row ::= row_list [:space:]* [.]?[\n]
294 * row_list ::= [:space:]* row_elem row_tail
295 * row_tail ::= [:space:]*[,] row_list |
297 * row_elem ::= [\t\ ]*[:alpha:]+
300 rp = mandoc_calloc(1, sizeof(struct tbl_row));
302 tbl->last_row->next = rp;
308 while (isspace((unsigned char)p[*pos]))
311 /* Safely exit layout context. */
313 if ('.' == p[*pos]) {
314 tbl->part = TBL_PART_DATA;
315 if (NULL == tbl->first_row)
316 mandoc_msg(MANDOCERR_TBLNOLAYOUT, tbl->parse,
322 /* End (and possibly restart) a row. */
324 if (',' == p[*pos]) {
327 } else if ('\0' == p[*pos])
330 if ( ! cell(tbl, rp, ln, p, pos))
338 tbl_layout(struct tbl_node *tbl, int ln, const char *p)
343 row(tbl, ln, p, &pos);
345 /* Always succeed. */
349 static struct tbl_cell *
350 cell_alloc(struct tbl_node *tbl, struct tbl_row *rp, enum tbl_cellt pos,
353 struct tbl_cell *p, *pp;
354 struct tbl_head *h, *hp;
356 p = mandoc_calloc(1, sizeof(struct tbl_cell));
358 if (NULL != (pp = rp->last)) {
377 hp = mandoc_calloc(1, sizeof(struct tbl_head));
378 hp->ident = tbl->opts.cols++;
381 if (tbl->last_head) {
382 hp->prev = tbl->last_head;
383 tbl->last_head->next = hp;
385 tbl->first_head = hp;