Annotation of mandoc/tbl_layout.c, Revision 1.27
1.27 ! schwarze 1: /* $Id: tbl_layout.c,v 1.26 2014/04/20 16:46:05 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: #include "config.h"
1.27 ! schwarze 19:
! 20: #include <sys/types.h>
1.18 kristaps 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:
1.26 schwarze 58: static int mods(struct tbl_node *, struct tbl_cell *,
1.5 kristaps 59: int, const char *, int *);
1.26 schwarze 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:
1.26 schwarze 66:
1.1 kristaps 67: static int
1.26 schwarze 68: mods(struct tbl_node *tbl, struct tbl_cell *cp,
1.1 kristaps 69: int ln, const char *p, int *pos)
70: {
71: char buf[5];
72: int i;
1.20 kristaps 73:
74: /* Not all types accept modifiers. */
75:
76: switch (cp->pos) {
1.26 schwarze 77: case TBL_CELL_DOWN:
1.20 kristaps 78: /* FALLTHROUGH */
1.26 schwarze 79: case TBL_CELL_HORIZ:
1.20 kristaps 80: /* FALLTHROUGH */
1.26 schwarze 81: case TBL_CELL_DHORIZ:
1.20 kristaps 82: return(1);
83: default:
84: break;
85: }
1.1 kristaps 86:
87: mod:
1.26 schwarze 88: /*
1.1 kristaps 89: * XXX: since, at least for now, modifiers are non-conflicting
90: * (are separable by value, regardless of position), we let
91: * modifiers come in any order. The existing tbl doesn't let
92: * this happen.
93: */
94: switch (p[*pos]) {
1.26 schwarze 95: case '\0':
1.1 kristaps 96: /* FALLTHROUGH */
1.26 schwarze 97: case ' ':
1.1 kristaps 98: /* FALLTHROUGH */
1.26 schwarze 99: case '\t':
1.1 kristaps 100: /* FALLTHROUGH */
1.26 schwarze 101: case ',':
1.1 kristaps 102: /* FALLTHROUGH */
1.26 schwarze 103: case '.':
1.25 schwarze 104: /* FALLTHROUGH */
1.26 schwarze 105: case '|':
1.1 kristaps 106: return(1);
107: default:
108: break;
1.12 kristaps 109: }
110:
111: /* Throw away parenthesised expression. */
112:
113: if ('(' == p[*pos]) {
114: (*pos)++;
115: while (p[*pos] && ')' != p[*pos])
116: (*pos)++;
117: if (')' == p[*pos]) {
118: (*pos)++;
119: goto mod;
120: }
1.26 schwarze 121: mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
122: ln, *pos, NULL);
1.12 kristaps 123: return(0);
1.1 kristaps 124: }
125:
126: /* Parse numerical spacing from modifier string. */
127:
128: if (isdigit((unsigned char)p[*pos])) {
129: for (i = 0; i < 4; i++) {
130: if ( ! isdigit((unsigned char)p[*pos + i]))
131: break;
132: buf[i] = p[*pos + i];
133: }
134: buf[i] = '\0';
135:
136: /* No greater than 4 digits. */
137:
138: if (4 == i) {
1.26 schwarze 139: mandoc_msg(MANDOCERR_TBLLAYOUT,
140: tbl->parse, ln, *pos, NULL);
1.1 kristaps 141: return(0);
142: }
143:
144: *pos += i;
1.15 kristaps 145: cp->spacing = (size_t)atoi(buf);
1.1 kristaps 146:
147: goto mod;
148: /* NOTREACHED */
1.26 schwarze 149: }
1.1 kristaps 150:
151: /* TODO: GNU has many more extensions. */
152:
1.13 joerg 153: switch (tolower((unsigned char)p[(*pos)++])) {
1.26 schwarze 154: case 'z':
1.1 kristaps 155: cp->flags |= TBL_CELL_WIGN;
156: goto mod;
1.26 schwarze 157: case 'u':
1.1 kristaps 158: cp->flags |= TBL_CELL_UP;
159: goto mod;
1.26 schwarze 160: case 'e':
1.1 kristaps 161: cp->flags |= TBL_CELL_EQUAL;
162: goto mod;
1.26 schwarze 163: case 't':
1.1 kristaps 164: cp->flags |= TBL_CELL_TALIGN;
165: goto mod;
1.26 schwarze 166: case 'd':
1.1 kristaps 167: cp->flags |= TBL_CELL_BALIGN;
1.10 schwarze 168: goto mod;
1.26 schwarze 169: case 'w': /* XXX for now, ignore minimal column width */
1.1 kristaps 170: goto mod;
1.26 schwarze 171: case 'f':
1.2 kristaps 172: break;
1.26 schwarze 173: case 'r':
1.21 kristaps 174: /* FALLTHROUGH */
1.26 schwarze 175: case 'b':
1.1 kristaps 176: /* FALLTHROUGH */
1.26 schwarze 177: case 'i':
1.2 kristaps 178: (*pos)--;
1.1 kristaps 179: break;
180: default:
1.17 kristaps 181: mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
1.26 schwarze 182: ln, *pos - 1, NULL);
1.1 kristaps 183: return(0);
184: }
185:
1.13 joerg 186: switch (tolower((unsigned char)p[(*pos)++])) {
1.26 schwarze 187: case '3':
1.21 kristaps 188: /* FALLTHROUGH */
1.26 schwarze 189: case 'b':
1.1 kristaps 190: cp->flags |= TBL_CELL_BOLD;
191: goto mod;
1.26 schwarze 192: case '2':
1.21 kristaps 193: /* FALLTHROUGH */
1.26 schwarze 194: case 'i':
1.1 kristaps 195: cp->flags |= TBL_CELL_ITALIC;
1.21 kristaps 196: goto mod;
1.26 schwarze 197: case '1':
1.21 kristaps 198: /* FALLTHROUGH */
1.26 schwarze 199: case 'r':
1.1 kristaps 200: goto mod;
201: default:
202: break;
203: }
204:
1.17 kristaps 205: mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
1.26 schwarze 206: ln, *pos - 1, NULL);
1.1 kristaps 207: return(0);
208: }
209:
210: static int
1.26 schwarze 211: cell(struct tbl_node *tbl, struct tbl_row *rp,
1.1 kristaps 212: int ln, const char *p, int *pos)
213: {
1.23 schwarze 214: int vert, i;
1.1 kristaps 215: enum tbl_cellt c;
216:
1.23 schwarze 217: /* Handle vertical lines. */
218:
219: for (vert = 0; '|' == p[*pos]; ++*pos)
220: vert++;
221: while (' ' == p[*pos])
222: (*pos)++;
1.25 schwarze 223:
224: /* Handle trailing vertical lines */
225:
226: if ('.' == p[*pos] || '\0' == p[*pos]) {
227: rp->vert = vert;
228: return(1);
229: }
1.23 schwarze 230:
231: /* Parse the column position (`c', `l', `r', ...). */
1.1 kristaps 232:
233: for (i = 0; i < KEYS_MAX; i++)
1.13 joerg 234: if (tolower((unsigned char)p[*pos]) == keys[i].name)
1.1 kristaps 235: break;
236:
237: if (KEYS_MAX == i) {
1.26 schwarze 238: mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
239: ln, *pos, NULL);
1.1 kristaps 240: return(0);
241: }
242:
1.11 kristaps 243: c = keys[i].key;
244:
245: /*
246: * If a span cell is found first, raise a warning and abort the
1.14 kristaps 247: * parse. If a span cell is found and the last layout element
248: * isn't a "normal" layout, bail.
249: *
250: * FIXME: recover from this somehow?
1.11 kristaps 251: */
252:
1.14 kristaps 253: if (TBL_CELL_SPAN == c) {
254: if (NULL == rp->first) {
1.17 kristaps 255: mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
1.26 schwarze 256: ln, *pos, NULL);
1.14 kristaps 257: return(0);
258: } else if (rp->last)
259: switch (rp->last->pos) {
1.26 schwarze 260: case TBL_CELL_HORIZ:
261: /* FALLTHROUGH */
262: case TBL_CELL_DHORIZ:
263: mandoc_msg(MANDOCERR_TBLLAYOUT,
264: tbl->parse, ln, *pos, NULL);
1.14 kristaps 265: return(0);
266: default:
267: break;
268: }
1.16 kristaps 269: }
270:
271: /*
272: * If a vertical spanner is found, we may not be in the first
273: * row.
274: */
275:
276: if (TBL_CELL_DOWN == c && rp == tbl->first_row) {
1.17 kristaps 277: mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse, ln, *pos, NULL);
1.16 kristaps 278: return(0);
1.11 kristaps 279: }
280:
1.1 kristaps 281: (*pos)++;
282:
283: /* Disallow adjacent spacers. */
284:
1.23 schwarze 285: if (vert > 2) {
1.17 kristaps 286: mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse, ln, *pos - 1, NULL);
1.1 kristaps 287: return(0);
288: }
289:
290: /* Allocate cell then parse its modifiers. */
291:
1.23 schwarze 292: return(mods(tbl, cell_alloc(tbl, rp, c, vert), ln, p, pos));
1.1 kristaps 293: }
294:
295: static void
1.6 kristaps 296: row(struct tbl_node *tbl, int ln, const char *p, int *pos)
1.1 kristaps 297: {
298: struct tbl_row *rp;
299:
300: row: /*
301: * EBNF describing this section:
302: *
303: * row ::= row_list [:space:]* [.]?[\n]
304: * row_list ::= [:space:]* row_elem row_tail
305: * row_tail ::= [:space:]*[,] row_list |
306: * epsilon
307: * row_elem ::= [\t\ ]*[:alpha:]+
308: */
309:
310: rp = mandoc_calloc(1, sizeof(struct tbl_row));
1.23 schwarze 311: if (tbl->last_row)
1.3 kristaps 312: tbl->last_row->next = rp;
1.23 schwarze 313: else
314: tbl->first_row = rp;
315: tbl->last_row = rp;
1.1 kristaps 316:
317: cell:
318: while (isspace((unsigned char)p[*pos]))
319: (*pos)++;
320:
321: /* Safely exit layout context. */
322:
323: if ('.' == p[*pos]) {
324: tbl->part = TBL_PART_DATA;
1.26 schwarze 325: if (NULL == tbl->first_row)
326: mandoc_msg(MANDOCERR_TBLNOLAYOUT,
327: tbl->parse, ln, *pos, NULL);
1.1 kristaps 328: (*pos)++;
329: return;
330: }
331:
332: /* End (and possibly restart) a row. */
333:
334: if (',' == p[*pos]) {
335: (*pos)++;
336: goto row;
337: } else if ('\0' == p[*pos])
338: return;
339:
340: if ( ! cell(tbl, rp, ln, p, pos))
341: return;
342:
343: goto cell;
344: /* NOTREACHED */
345: }
346:
347: int
1.6 kristaps 348: tbl_layout(struct tbl_node *tbl, int ln, const char *p)
1.1 kristaps 349: {
350: int pos;
351:
352: pos = 0;
353: row(tbl, ln, p, &pos);
354:
355: /* Always succeed. */
356: return(1);
357: }
1.5 kristaps 358:
359: static struct tbl_cell *
1.23 schwarze 360: cell_alloc(struct tbl_node *tbl, struct tbl_row *rp, enum tbl_cellt pos,
361: int vert)
1.5 kristaps 362: {
363: struct tbl_cell *p, *pp;
364: struct tbl_head *h, *hp;
365:
366: p = mandoc_calloc(1, sizeof(struct tbl_cell));
367:
368: if (NULL != (pp = rp->last)) {
1.23 schwarze 369: pp->next = p;
370: h = pp->head->next;
371: } else {
372: rp->first = p;
373: h = tbl->first_head;
374: }
375: rp->last = p;
1.5 kristaps 376:
377: p->pos = pos;
1.23 schwarze 378: p->vert = vert;
1.5 kristaps 379:
1.23 schwarze 380: /* Re-use header. */
1.5 kristaps 381:
382: if (h) {
1.23 schwarze 383: p->head = h;
384: return(p);
1.5 kristaps 385: }
386:
387: hp = mandoc_calloc(1, sizeof(struct tbl_head));
1.9 kristaps 388: hp->ident = tbl->opts.cols++;
1.23 schwarze 389: hp->vert = vert;
1.5 kristaps 390:
391: if (tbl->last_head) {
392: hp->prev = tbl->last_head;
393: tbl->last_head->next = hp;
394: } else
1.23 schwarze 395: tbl->first_head = hp;
396: tbl->last_head = hp;
1.5 kristaps 397:
398: p->head = hp;
399: return(p);
400: }
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