Annotation of src/usr.bin/mandoc/tbl_layout.c, Revision 1.10
1.10 ! schwarze 1: /* $Id: tbl_layout.c,v 1.9 2011/05/29 21:22:18 schwarze Exp $ */
1.1 schwarze 2: /*
1.4 schwarze 3: * Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
1.1 schwarze 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: #include <assert.h>
18: #include <ctype.h>
19: #include <stdlib.h>
20: #include <string.h>
1.4 schwarze 21: #include <time.h>
1.1 schwarze 22:
1.4 schwarze 23: #include "mandoc.h"
24: #include "libmandoc.h"
25: #include "libroff.h"
1.1 schwarze 26:
27: struct tbl_phrase {
28: char name;
29: enum tbl_cellt key;
30: };
31:
1.6 schwarze 32: /*
33: * FIXME: we can make this parse a lot nicer by, when an error is
34: * encountered in a layout key, bailing to the next key (i.e. to the
35: * next whitespace then continuing).
36: */
37:
1.4 schwarze 38: #define KEYS_MAX 11
1.1 schwarze 39:
40: static const struct tbl_phrase keys[KEYS_MAX] = {
41: { 'c', TBL_CELL_CENTRE },
42: { 'r', TBL_CELL_RIGHT },
43: { 'l', TBL_CELL_LEFT },
44: { 'n', TBL_CELL_NUMBER },
45: { 's', TBL_CELL_SPAN },
46: { 'a', TBL_CELL_LONG },
47: { '^', TBL_CELL_DOWN },
48: { '-', TBL_CELL_HORIZ },
49: { '_', TBL_CELL_HORIZ },
50: { '=', TBL_CELL_DHORIZ },
51: { '|', TBL_CELL_VERT }
52: };
53:
1.4 schwarze 54: static int mods(struct tbl_node *, struct tbl_cell *,
55: int, const char *, int *);
56: static int cell(struct tbl_node *, struct tbl_row *,
1.1 schwarze 57: int, const char *, int *);
1.4 schwarze 58: static void row(struct tbl_node *, int, const char *, int *);
59: static struct tbl_cell *cell_alloc(struct tbl_node *,
60: struct tbl_row *, enum tbl_cellt);
61: static void head_adjust(const struct tbl_cell *,
62: struct tbl_head *);
1.1 schwarze 63:
64: static int
1.4 schwarze 65: mods(struct tbl_node *tbl, struct tbl_cell *cp,
66: int ln, const char *p, int *pos)
1.1 schwarze 67: {
68: char buf[5];
69: int i;
70:
1.9 schwarze 71: /* Not all types accept modifiers. */
72:
73: switch (cp->pos) {
74: case (TBL_CELL_DOWN):
75: /* FALLTHROUGH */
76: case (TBL_CELL_HORIZ):
77: /* FALLTHROUGH */
78: case (TBL_CELL_DHORIZ):
79: /* FALLTHROUGH */
80: case (TBL_CELL_VERT):
81: /* FALLTHROUGH */
82: case (TBL_CELL_DVERT):
83: return(1);
84: default:
85: break;
86: }
87:
1.4 schwarze 88: mod:
1.1 schwarze 89: /*
90: * XXX: since, at least for now, modifiers are non-conflicting
91: * (are separable by value, regardless of position), we let
92: * modifiers come in any order. The existing tbl doesn't let
93: * this happen.
94: */
1.4 schwarze 95: switch (p[*pos]) {
96: case ('\0'):
97: /* FALLTHROUGH */
98: case (' '):
99: /* FALLTHROUGH */
100: case ('\t'):
101: /* FALLTHROUGH */
102: case (','):
103: /* FALLTHROUGH */
104: case ('.'):
1.1 schwarze 105: return(1);
1.4 schwarze 106: default:
107: break;
108: }
1.1 schwarze 109:
1.6 schwarze 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: }
1.8 schwarze 120: mandoc_msg(MANDOCERR_TBLLAYOUT,
121: tbl->parse, ln, *pos, NULL);
1.6 schwarze 122: return(0);
123: }
124:
1.1 schwarze 125: /* Parse numerical spacing from modifier string. */
126:
1.4 schwarze 127: if (isdigit((unsigned char)p[*pos])) {
1.1 schwarze 128: for (i = 0; i < 4; i++) {
1.4 schwarze 129: if ( ! isdigit((unsigned char)p[*pos + i]))
1.1 schwarze 130: break;
1.4 schwarze 131: buf[i] = p[*pos + i];
1.1 schwarze 132: }
1.4 schwarze 133: buf[i] = '\0';
1.1 schwarze 134:
135: /* No greater than 4 digits. */
136:
1.4 schwarze 137: if (4 == i) {
1.8 schwarze 138: mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
139: ln, *pos, NULL);
1.4 schwarze 140: return(0);
141: }
1.1 schwarze 142:
1.4 schwarze 143: *pos += i;
1.7 schwarze 144: cp->spacing = (size_t)atoi(buf);
1.1 schwarze 145:
1.4 schwarze 146: goto mod;
147: /* NOTREACHED */
1.1 schwarze 148: }
149:
150: /* TODO: GNU has many more extensions. */
151:
1.6 schwarze 152: switch (tolower((unsigned char)p[(*pos)++])) {
1.1 schwarze 153: case ('z'):
154: cp->flags |= TBL_CELL_WIGN;
1.4 schwarze 155: goto mod;
1.1 schwarze 156: case ('u'):
157: cp->flags |= TBL_CELL_UP;
1.4 schwarze 158: goto mod;
1.1 schwarze 159: case ('e'):
160: cp->flags |= TBL_CELL_EQUAL;
1.4 schwarze 161: goto mod;
1.1 schwarze 162: case ('t'):
163: cp->flags |= TBL_CELL_TALIGN;
1.4 schwarze 164: goto mod;
1.1 schwarze 165: case ('d'):
166: cp->flags |= TBL_CELL_BALIGN;
1.5 schwarze 167: goto mod;
168: case ('w'): /* XXX for now, ignore minimal column width */
1.4 schwarze 169: goto mod;
1.1 schwarze 170: case ('f'):
1.4 schwarze 171: break;
1.10 ! schwarze 172: case ('r'):
! 173: /* FALLTHROUGH */
1.1 schwarze 174: case ('b'):
175: /* FALLTHROUGH */
176: case ('i'):
1.4 schwarze 177: (*pos)--;
1.1 schwarze 178: break;
179: default:
1.8 schwarze 180: mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
181: ln, *pos - 1, NULL);
1.4 schwarze 182: return(0);
1.1 schwarze 183: }
184:
1.6 schwarze 185: switch (tolower((unsigned char)p[(*pos)++])) {
1.10 ! schwarze 186: case ('3'):
! 187: /* FALLTHROUGH */
1.1 schwarze 188: case ('b'):
189: cp->flags |= TBL_CELL_BOLD;
1.4 schwarze 190: goto mod;
1.10 ! schwarze 191: case ('2'):
! 192: /* FALLTHROUGH */
1.1 schwarze 193: case ('i'):
194: cp->flags |= TBL_CELL_ITALIC;
1.10 ! schwarze 195: goto mod;
! 196: case ('1'):
! 197: /* FALLTHROUGH */
! 198: case ('r'):
1.4 schwarze 199: goto mod;
1.1 schwarze 200: default:
201: break;
202: }
203:
1.8 schwarze 204: mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
205: ln, *pos - 1, NULL);
1.4 schwarze 206: return(0);
1.1 schwarze 207: }
208:
209: static int
1.4 schwarze 210: cell(struct tbl_node *tbl, struct tbl_row *rp,
211: int ln, const char *p, int *pos)
1.1 schwarze 212: {
1.4 schwarze 213: int i;
1.1 schwarze 214: enum tbl_cellt c;
215:
216: /* Parse the column position (`r', `R', `|', ...). */
217:
1.4 schwarze 218: for (i = 0; i < KEYS_MAX; i++)
1.6 schwarze 219: if (tolower((unsigned char)p[*pos]) == keys[i].name)
1.4 schwarze 220: break;
221:
222: if (KEYS_MAX == i) {
1.8 schwarze 223: mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
224: ln, *pos, NULL);
1.4 schwarze 225: return(0);
1.1 schwarze 226: }
227:
1.6 schwarze 228: c = keys[i].key;
229:
230: /*
231: * If a span cell is found first, raise a warning and abort the
1.7 schwarze 232: * parse. If a span cell is found and the last layout element
233: * isn't a "normal" layout, bail.
234: *
235: * FIXME: recover from this somehow?
1.6 schwarze 236: */
237:
1.7 schwarze 238: if (TBL_CELL_SPAN == c) {
239: if (NULL == rp->first) {
1.8 schwarze 240: mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
241: ln, *pos, NULL);
1.7 schwarze 242: return(0);
243: } else if (rp->last)
244: switch (rp->last->pos) {
245: case (TBL_CELL_VERT):
246: case (TBL_CELL_DVERT):
247: case (TBL_CELL_HORIZ):
248: case (TBL_CELL_DHORIZ):
1.8 schwarze 249: mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
250: ln, *pos, NULL);
1.7 schwarze 251: return(0);
252: default:
253: break;
254: }
255: }
256:
257: /*
258: * If a vertical spanner is found, we may not be in the first
259: * row.
260: */
261:
262: if (TBL_CELL_DOWN == c && rp == tbl->first_row) {
1.8 schwarze 263: mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse, ln, *pos, NULL);
1.6 schwarze 264: return(0);
265: }
266:
1.4 schwarze 267: (*pos)++;
1.1 schwarze 268:
269: /* Extra check for the double-vertical. */
270:
1.4 schwarze 271: if (TBL_CELL_VERT == c && '|' == p[*pos]) {
272: (*pos)++;
1.1 schwarze 273: c = TBL_CELL_DVERT;
1.4 schwarze 274: }
1.1 schwarze 275:
1.4 schwarze 276: /* Disallow adjacent spacers. */
1.1 schwarze 277:
1.4 schwarze 278: if (rp->last && (TBL_CELL_VERT == c || TBL_CELL_DVERT == c) &&
279: (TBL_CELL_VERT == rp->last->pos ||
280: TBL_CELL_DVERT == rp->last->pos)) {
1.8 schwarze 281: mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse, ln, *pos - 1, NULL);
1.4 schwarze 282: return(0);
283: }
1.1 schwarze 284:
285: /* Allocate cell then parse its modifiers. */
286:
1.4 schwarze 287: return(mods(tbl, cell_alloc(tbl, rp, c), ln, p, pos));
1.1 schwarze 288: }
289:
290:
1.4 schwarze 291: static void
292: row(struct tbl_node *tbl, int ln, const char *p, int *pos)
1.1 schwarze 293: {
294: struct tbl_row *rp;
295:
1.4 schwarze 296: row: /*
1.1 schwarze 297: * EBNF describing this section:
298: *
299: * row ::= row_list [:space:]* [.]?[\n]
300: * row_list ::= [:space:]* row_elem row_tail
301: * row_tail ::= [:space:]*[,] row_list |
302: * epsilon
303: * row_elem ::= [\t\ ]*[:alpha:]+
304: */
305:
1.4 schwarze 306: rp = mandoc_calloc(1, sizeof(struct tbl_row));
307: if (tbl->last_row) {
308: tbl->last_row->next = rp;
309: tbl->last_row = rp;
310: } else
311: tbl->last_row = tbl->first_row = rp;
312:
313: cell:
314: while (isspace((unsigned char)p[*pos]))
315: (*pos)++;
316:
317: /* Safely exit layout context. */
318:
319: if ('.' == p[*pos]) {
1.1 schwarze 320: tbl->part = TBL_PART_DATA;
1.4 schwarze 321: if (NULL == tbl->first_row)
1.8 schwarze 322: mandoc_msg(MANDOCERR_TBLNOLAYOUT, tbl->parse,
323: ln, *pos, NULL);
1.4 schwarze 324: (*pos)++;
325: return;
1.1 schwarze 326: }
327:
1.4 schwarze 328: /* End (and possibly restart) a row. */
329:
330: if (',' == p[*pos]) {
331: (*pos)++;
332: goto row;
333: } else if ('\0' == p[*pos])
334: return;
335:
336: if ( ! cell(tbl, rp, ln, p, pos))
337: return;
338:
339: goto cell;
340: /* NOTREACHED */
1.1 schwarze 341: }
342:
343: int
1.4 schwarze 344: tbl_layout(struct tbl_node *tbl, int ln, const char *p)
1.1 schwarze 345: {
346: int pos;
347:
348: pos = 0;
1.4 schwarze 349: row(tbl, ln, p, &pos);
350:
351: /* Always succeed. */
352: return(1);
1.1 schwarze 353: }
1.4 schwarze 354:
355: static struct tbl_cell *
356: cell_alloc(struct tbl_node *tbl, struct tbl_row *rp, enum tbl_cellt pos)
357: {
358: struct tbl_cell *p, *pp;
359: struct tbl_head *h, *hp;
360:
361: p = mandoc_calloc(1, sizeof(struct tbl_cell));
362:
363: if (NULL != (pp = rp->last)) {
364: rp->last->next = p;
365: rp->last = p;
366: } else
367: rp->last = rp->first = p;
368:
369: p->pos = pos;
370:
371: /*
372: * This is a little bit complicated. Here we determine the
373: * header the corresponds to a cell. We add headers dynamically
374: * when need be or re-use them, otherwise. As an example, given
375: * the following:
376: *
377: * 1 c || l
378: * 2 | c | l
379: * 3 l l
380: * 3 || c | l |.
381: *
382: * We first add the new headers (as there are none) in (1); then
383: * in (2) we insert the first spanner (as it doesn't match up
384: * with the header); then we re-use the prior data headers,
385: * skipping over the spanners; then we re-use everything and add
386: * a last spanner. Note that VERT headers are made into DVERT
387: * ones.
388: */
389:
390: h = pp ? pp->head->next : tbl->first_head;
391:
392: if (h) {
393: /* Re-use data header. */
394: if (TBL_HEAD_DATA == h->pos &&
395: (TBL_CELL_VERT != p->pos &&
396: TBL_CELL_DVERT != p->pos)) {
397: p->head = h;
398: return(p);
399: }
400:
401: /* Re-use spanner header. */
402: if (TBL_HEAD_DATA != h->pos &&
403: (TBL_CELL_VERT == p->pos ||
404: TBL_CELL_DVERT == p->pos)) {
405: head_adjust(p, h);
406: p->head = h;
407: return(p);
408: }
409:
410: /* Right-shift headers with a new spanner. */
411: if (TBL_HEAD_DATA == h->pos &&
412: (TBL_CELL_VERT == p->pos ||
413: TBL_CELL_DVERT == p->pos)) {
414: hp = mandoc_calloc(1, sizeof(struct tbl_head));
415: hp->ident = tbl->opts.cols++;
416: hp->prev = h->prev;
417: if (h->prev)
418: h->prev->next = hp;
419: if (h == tbl->first_head)
420: tbl->first_head = hp;
421: h->prev = hp;
422: hp->next = h;
423: head_adjust(p, hp);
424: p->head = hp;
425: return(p);
426: }
427:
428: if (NULL != (h = h->next)) {
429: head_adjust(p, h);
430: p->head = h;
431: return(p);
432: }
433:
434: /* Fall through to default case... */
435: }
436:
437: hp = mandoc_calloc(1, sizeof(struct tbl_head));
438: hp->ident = tbl->opts.cols++;
439:
440: if (tbl->last_head) {
441: hp->prev = tbl->last_head;
442: tbl->last_head->next = hp;
443: tbl->last_head = hp;
444: } else
445: tbl->last_head = tbl->first_head = hp;
446:
447: head_adjust(p, hp);
448: p->head = hp;
449: return(p);
450: }
451:
452: static void
1.9 schwarze 453: head_adjust(const struct tbl_cell *cellp, struct tbl_head *head)
1.4 schwarze 454: {
1.9 schwarze 455: if (TBL_CELL_VERT != cellp->pos &&
456: TBL_CELL_DVERT != cellp->pos) {
1.4 schwarze 457: head->pos = TBL_HEAD_DATA;
458: return;
459: }
460:
1.9 schwarze 461: if (TBL_CELL_VERT == cellp->pos)
1.4 schwarze 462: if (TBL_HEAD_DVERT != head->pos)
463: head->pos = TBL_HEAD_VERT;
464:
1.9 schwarze 465: if (TBL_CELL_DVERT == cellp->pos)
1.4 schwarze 466: head->pos = TBL_HEAD_DVERT;
467: }
468:
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