Annotation of mandoc/tbl_layout.c, Revision 1.25
1.25 ! schwarze 1: /* $Id: tbl_layout.c,v 1.24 2014/03/23 11:25:26 schwarze Exp $ */
1.1 kristaps 2: /*
1.22 schwarze 3: * Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
1.25 ! schwarze 4: * Copyright (c) 2012, 2014 Ingo Schwarze <schwarze@openbsd.org>
1.1 kristaps 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 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.
17: */
1.18 kristaps 18: #ifdef HAVE_CONFIG_H
19: #include "config.h"
20: #endif
21:
1.1 kristaps 22: #include <ctype.h>
23: #include <stdlib.h>
24: #include <string.h>
1.4 kristaps 25: #include <time.h>
1.1 kristaps 26:
27: #include "mandoc.h"
1.24 schwarze 28: #include "mandoc_aux.h"
1.1 kristaps 29: #include "libmandoc.h"
30: #include "libroff.h"
31:
32: struct tbl_phrase {
33: char name;
34: enum tbl_cellt key;
35: };
36:
1.11 kristaps 37: /*
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).
41: */
42:
1.2 kristaps 43: #define KEYS_MAX 11
1.1 kristaps 44:
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 },
1.23 schwarze 55: { '=', TBL_CELL_DHORIZ }
1.1 kristaps 56: };
57:
1.6 kristaps 58: static int mods(struct tbl_node *, struct tbl_cell *,
1.5 kristaps 59: int, const char *, int *);
1.6 kristaps 60: static int cell(struct tbl_node *, struct tbl_row *,
1.5 kristaps 61: int, const char *, int *);
1.6 kristaps 62: static void row(struct tbl_node *, int, const char *, int *);
1.23 schwarze 63: static struct tbl_cell *cell_alloc(struct tbl_node *, struct tbl_row *,
64: enum tbl_cellt, int vert);
1.1 kristaps 65:
66: static int
1.6 kristaps 67: mods(struct tbl_node *tbl, struct tbl_cell *cp,
1.1 kristaps 68: int ln, const char *p, int *pos)
69: {
70: char buf[5];
71: int i;
1.20 kristaps 72:
73: /* Not all types accept modifiers. */
74:
75: switch (cp->pos) {
76: case (TBL_CELL_DOWN):
77: /* FALLTHROUGH */
78: case (TBL_CELL_HORIZ):
79: /* FALLTHROUGH */
80: case (TBL_CELL_DHORIZ):
81: return(1);
82: default:
83: break;
84: }
1.1 kristaps 85:
86: mod:
87: /*
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
91: * this happen.
92: */
93: switch (p[*pos]) {
94: case ('\0'):
95: /* FALLTHROUGH */
96: case (' '):
97: /* FALLTHROUGH */
98: case ('\t'):
99: /* FALLTHROUGH */
100: case (','):
101: /* FALLTHROUGH */
102: case ('.'):
1.25 ! schwarze 103: /* FALLTHROUGH */
! 104: case ('|'):
1.1 kristaps 105: return(1);
106: default:
107: break;
1.12 kristaps 108: }
109:
110: /* Throw away parenthesised expression. */
111:
112: if ('(' == p[*pos]) {
113: (*pos)++;
114: while (p[*pos] && ')' != p[*pos])
115: (*pos)++;
116: if (')' == p[*pos]) {
117: (*pos)++;
118: goto mod;
119: }
1.17 kristaps 120: mandoc_msg(MANDOCERR_TBLLAYOUT,
121: tbl->parse, ln, *pos, NULL);
1.12 kristaps 122: return(0);
1.1 kristaps 123: }
124:
125: /* Parse numerical spacing from modifier string. */
126:
127: if (isdigit((unsigned char)p[*pos])) {
128: for (i = 0; i < 4; i++) {
129: if ( ! isdigit((unsigned char)p[*pos + i]))
130: break;
131: buf[i] = p[*pos + i];
132: }
133: buf[i] = '\0';
134:
135: /* No greater than 4 digits. */
136:
137: if (4 == i) {
1.17 kristaps 138: mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
139: ln, *pos, NULL);
1.1 kristaps 140: return(0);
141: }
142:
143: *pos += i;
1.15 kristaps 144: cp->spacing = (size_t)atoi(buf);
1.1 kristaps 145:
146: goto mod;
147: /* NOTREACHED */
148: }
149:
150: /* TODO: GNU has many more extensions. */
151:
1.13 joerg 152: switch (tolower((unsigned char)p[(*pos)++])) {
1.1 kristaps 153: case ('z'):
154: cp->flags |= TBL_CELL_WIGN;
155: goto mod;
156: case ('u'):
157: cp->flags |= TBL_CELL_UP;
158: goto mod;
159: case ('e'):
160: cp->flags |= TBL_CELL_EQUAL;
161: goto mod;
162: case ('t'):
163: cp->flags |= TBL_CELL_TALIGN;
164: goto mod;
165: case ('d'):
166: cp->flags |= TBL_CELL_BALIGN;
1.10 schwarze 167: goto mod;
168: case ('w'): /* XXX for now, ignore minimal column width */
1.1 kristaps 169: goto mod;
170: case ('f'):
1.2 kristaps 171: break;
1.21 kristaps 172: case ('r'):
173: /* FALLTHROUGH */
1.1 kristaps 174: case ('b'):
175: /* FALLTHROUGH */
176: case ('i'):
1.2 kristaps 177: (*pos)--;
1.1 kristaps 178: break;
179: default:
1.17 kristaps 180: mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
181: ln, *pos - 1, NULL);
1.1 kristaps 182: return(0);
183: }
184:
1.13 joerg 185: switch (tolower((unsigned char)p[(*pos)++])) {
1.21 kristaps 186: case ('3'):
187: /* FALLTHROUGH */
1.1 kristaps 188: case ('b'):
189: cp->flags |= TBL_CELL_BOLD;
190: goto mod;
1.21 kristaps 191: case ('2'):
192: /* FALLTHROUGH */
1.1 kristaps 193: case ('i'):
194: cp->flags |= TBL_CELL_ITALIC;
1.21 kristaps 195: goto mod;
196: case ('1'):
197: /* FALLTHROUGH */
198: case ('r'):
1.1 kristaps 199: goto mod;
200: default:
201: break;
202: }
203:
1.17 kristaps 204: mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
205: ln, *pos - 1, NULL);
1.1 kristaps 206: return(0);
207: }
208:
209: static int
1.6 kristaps 210: cell(struct tbl_node *tbl, struct tbl_row *rp,
1.1 kristaps 211: int ln, const char *p, int *pos)
212: {
1.23 schwarze 213: int vert, i;
1.1 kristaps 214: enum tbl_cellt c;
215:
1.23 schwarze 216: /* Handle vertical lines. */
217:
218: for (vert = 0; '|' == p[*pos]; ++*pos)
219: vert++;
220: while (' ' == p[*pos])
221: (*pos)++;
1.25 ! schwarze 222:
! 223: /* Handle trailing vertical lines */
! 224:
! 225: if ('.' == p[*pos] || '\0' == p[*pos]) {
! 226: rp->vert = vert;
! 227: return(1);
! 228: }
1.23 schwarze 229:
230: /* Parse the column position (`c', `l', `r', ...). */
1.1 kristaps 231:
232: for (i = 0; i < KEYS_MAX; i++)
1.13 joerg 233: if (tolower((unsigned char)p[*pos]) == keys[i].name)
1.1 kristaps 234: break;
235:
236: if (KEYS_MAX == i) {
1.17 kristaps 237: mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
238: ln, *pos, NULL);
1.1 kristaps 239: return(0);
240: }
241:
1.11 kristaps 242: c = keys[i].key;
243:
244: /*
245: * If a span cell is found first, raise a warning and abort the
1.14 kristaps 246: * parse. If a span cell is found and the last layout element
247: * isn't a "normal" layout, bail.
248: *
249: * FIXME: recover from this somehow?
1.11 kristaps 250: */
251:
1.14 kristaps 252: if (TBL_CELL_SPAN == c) {
253: if (NULL == rp->first) {
1.17 kristaps 254: mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
255: ln, *pos, NULL);
1.14 kristaps 256: return(0);
257: } else if (rp->last)
258: switch (rp->last->pos) {
259: case (TBL_CELL_HORIZ):
260: case (TBL_CELL_DHORIZ):
1.17 kristaps 261: mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
262: ln, *pos, NULL);
1.14 kristaps 263: return(0);
264: default:
265: break;
266: }
1.16 kristaps 267: }
268:
269: /*
270: * If a vertical spanner is found, we may not be in the first
271: * row.
272: */
273:
274: if (TBL_CELL_DOWN == c && rp == tbl->first_row) {
1.17 kristaps 275: mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse, ln, *pos, NULL);
1.16 kristaps 276: return(0);
1.11 kristaps 277: }
278:
1.1 kristaps 279: (*pos)++;
280:
281: /* Disallow adjacent spacers. */
282:
1.23 schwarze 283: if (vert > 2) {
1.17 kristaps 284: mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse, ln, *pos - 1, NULL);
1.1 kristaps 285: return(0);
286: }
287:
288: /* Allocate cell then parse its modifiers. */
289:
1.23 schwarze 290: return(mods(tbl, cell_alloc(tbl, rp, c, vert), ln, p, pos));
1.1 kristaps 291: }
292:
293:
294: static void
1.6 kristaps 295: row(struct tbl_node *tbl, int ln, const char *p, int *pos)
1.1 kristaps 296: {
297: struct tbl_row *rp;
298:
299: row: /*
300: * EBNF describing this section:
301: *
302: * row ::= row_list [:space:]* [.]?[\n]
303: * row_list ::= [:space:]* row_elem row_tail
304: * row_tail ::= [:space:]*[,] row_list |
305: * epsilon
306: * row_elem ::= [\t\ ]*[:alpha:]+
307: */
308:
309: rp = mandoc_calloc(1, sizeof(struct tbl_row));
1.23 schwarze 310: if (tbl->last_row)
1.3 kristaps 311: tbl->last_row->next = rp;
1.23 schwarze 312: else
313: tbl->first_row = rp;
314: tbl->last_row = rp;
1.1 kristaps 315:
316: cell:
317: while (isspace((unsigned char)p[*pos]))
318: (*pos)++;
319:
320: /* Safely exit layout context. */
321:
322: if ('.' == p[*pos]) {
323: tbl->part = TBL_PART_DATA;
1.3 kristaps 324: if (NULL == tbl->first_row)
1.17 kristaps 325: mandoc_msg(MANDOCERR_TBLNOLAYOUT, tbl->parse,
326: ln, *pos, NULL);
1.1 kristaps 327: (*pos)++;
328: return;
329: }
330:
331: /* End (and possibly restart) a row. */
332:
333: if (',' == p[*pos]) {
334: (*pos)++;
335: goto row;
336: } else if ('\0' == p[*pos])
337: return;
338:
339: if ( ! cell(tbl, rp, ln, p, pos))
340: return;
341:
342: goto cell;
343: /* NOTREACHED */
344: }
345:
346: int
1.6 kristaps 347: tbl_layout(struct tbl_node *tbl, int ln, const char *p)
1.1 kristaps 348: {
349: int pos;
350:
351: pos = 0;
352: row(tbl, ln, p, &pos);
353:
354: /* Always succeed. */
355: return(1);
356: }
1.5 kristaps 357:
358: static struct tbl_cell *
1.23 schwarze 359: cell_alloc(struct tbl_node *tbl, struct tbl_row *rp, enum tbl_cellt pos,
360: int vert)
1.5 kristaps 361: {
362: struct tbl_cell *p, *pp;
363: struct tbl_head *h, *hp;
364:
365: p = mandoc_calloc(1, sizeof(struct tbl_cell));
366:
367: if (NULL != (pp = rp->last)) {
1.23 schwarze 368: pp->next = p;
369: h = pp->head->next;
370: } else {
371: rp->first = p;
372: h = tbl->first_head;
373: }
374: rp->last = p;
1.5 kristaps 375:
376: p->pos = pos;
1.23 schwarze 377: p->vert = vert;
1.5 kristaps 378:
1.23 schwarze 379: /* Re-use header. */
1.5 kristaps 380:
381: if (h) {
1.23 schwarze 382: p->head = h;
383: return(p);
1.5 kristaps 384: }
385:
386: hp = mandoc_calloc(1, sizeof(struct tbl_head));
1.9 kristaps 387: hp->ident = tbl->opts.cols++;
1.23 schwarze 388: hp->vert = vert;
1.5 kristaps 389:
390: if (tbl->last_head) {
391: hp->prev = tbl->last_head;
392: tbl->last_head->next = hp;
393: } else
1.23 schwarze 394: tbl->first_head = hp;
395: tbl->last_head = hp;
1.5 kristaps 396:
397: p->head = hp;
398: return(p);
399: }
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