Annotation of src/usr.bin/mandoc/tbl_layout.c, Revision 1.5
1.5 ! schwarze 1: /* $Id: tbl_layout.c,v 1.4 2011/01/04 22:28:17 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:
1.4 schwarze 32: #define KEYS_MAX 11
1.1 schwarze 33:
34: static const struct tbl_phrase keys[KEYS_MAX] = {
35: { 'c', TBL_CELL_CENTRE },
36: { 'r', TBL_CELL_RIGHT },
37: { 'l', TBL_CELL_LEFT },
38: { 'n', TBL_CELL_NUMBER },
39: { 's', TBL_CELL_SPAN },
40: { 'a', TBL_CELL_LONG },
41: { '^', TBL_CELL_DOWN },
42: { '-', TBL_CELL_HORIZ },
43: { '_', TBL_CELL_HORIZ },
44: { '=', TBL_CELL_DHORIZ },
45: { '|', TBL_CELL_VERT }
46: };
47:
1.4 schwarze 48: static int mods(struct tbl_node *, struct tbl_cell *,
49: int, const char *, int *);
50: static int cell(struct tbl_node *, struct tbl_row *,
1.1 schwarze 51: int, const char *, int *);
1.4 schwarze 52: static void row(struct tbl_node *, int, const char *, int *);
53: static struct tbl_cell *cell_alloc(struct tbl_node *,
54: struct tbl_row *, enum tbl_cellt);
55: static void head_adjust(const struct tbl_cell *,
56: struct tbl_head *);
1.1 schwarze 57:
58: static int
1.4 schwarze 59: mods(struct tbl_node *tbl, struct tbl_cell *cp,
60: int ln, const char *p, int *pos)
1.1 schwarze 61: {
62: char buf[5];
63: int i;
64:
1.4 schwarze 65: mod:
1.1 schwarze 66: /*
67: * XXX: since, at least for now, modifiers are non-conflicting
68: * (are separable by value, regardless of position), we let
69: * modifiers come in any order. The existing tbl doesn't let
70: * this happen.
71: */
1.4 schwarze 72: switch (p[*pos]) {
73: case ('\0'):
74: /* FALLTHROUGH */
75: case (' '):
76: /* FALLTHROUGH */
77: case ('\t'):
78: /* FALLTHROUGH */
79: case (','):
80: /* FALLTHROUGH */
81: case ('.'):
1.1 schwarze 82: return(1);
1.4 schwarze 83: default:
84: break;
85: }
1.1 schwarze 86:
87: /* Parse numerical spacing from modifier string. */
88:
1.4 schwarze 89: if (isdigit((unsigned char)p[*pos])) {
1.1 schwarze 90: for (i = 0; i < 4; i++) {
1.4 schwarze 91: if ( ! isdigit((unsigned char)p[*pos + i]))
1.1 schwarze 92: break;
1.4 schwarze 93: buf[i] = p[*pos + i];
1.1 schwarze 94: }
1.4 schwarze 95: buf[i] = '\0';
1.1 schwarze 96:
97: /* No greater than 4 digits. */
98:
1.4 schwarze 99: if (4 == i) {
100: TBL_MSG(tbl, MANDOCERR_TBLLAYOUT, ln, *pos);
101: return(0);
102: }
1.1 schwarze 103:
1.4 schwarze 104: *pos += i;
105: cp->spacing = atoi(buf);
1.1 schwarze 106:
1.4 schwarze 107: goto mod;
108: /* NOTREACHED */
1.1 schwarze 109: }
110:
111: /* TODO: GNU has many more extensions. */
112:
1.4 schwarze 113: switch (tolower(p[(*pos)++])) {
1.1 schwarze 114: case ('z'):
115: cp->flags |= TBL_CELL_WIGN;
1.4 schwarze 116: goto mod;
1.1 schwarze 117: case ('u'):
118: cp->flags |= TBL_CELL_UP;
1.4 schwarze 119: goto mod;
1.1 schwarze 120: case ('e'):
121: cp->flags |= TBL_CELL_EQUAL;
1.4 schwarze 122: goto mod;
1.1 schwarze 123: case ('t'):
124: cp->flags |= TBL_CELL_TALIGN;
1.4 schwarze 125: goto mod;
1.1 schwarze 126: case ('d'):
127: cp->flags |= TBL_CELL_BALIGN;
1.5 ! schwarze 128: goto mod;
! 129: case ('w'): /* XXX for now, ignore minimal column width */
1.4 schwarze 130: goto mod;
1.1 schwarze 131: case ('f'):
1.4 schwarze 132: break;
1.1 schwarze 133: case ('b'):
134: /* FALLTHROUGH */
135: case ('i'):
1.4 schwarze 136: (*pos)--;
1.1 schwarze 137: break;
138: default:
1.4 schwarze 139: TBL_MSG(tbl, MANDOCERR_TBLLAYOUT, ln, *pos - 1);
140: return(0);
1.1 schwarze 141: }
142:
1.4 schwarze 143: switch (tolower(p[(*pos)++])) {
1.1 schwarze 144: case ('b'):
145: cp->flags |= TBL_CELL_BOLD;
1.4 schwarze 146: goto mod;
1.1 schwarze 147: case ('i'):
148: cp->flags |= TBL_CELL_ITALIC;
1.4 schwarze 149: goto mod;
1.1 schwarze 150: default:
151: break;
152: }
153:
1.4 schwarze 154: TBL_MSG(tbl, MANDOCERR_TBLLAYOUT, ln, *pos - 1);
155: return(0);
1.1 schwarze 156: }
157:
158: static int
1.4 schwarze 159: cell(struct tbl_node *tbl, struct tbl_row *rp,
160: int ln, const char *p, int *pos)
1.1 schwarze 161: {
1.4 schwarze 162: int i;
1.1 schwarze 163: enum tbl_cellt c;
164:
165: /* Parse the column position (`r', `R', `|', ...). */
166:
1.4 schwarze 167: for (i = 0; i < KEYS_MAX; i++)
168: if (tolower(p[*pos]) == keys[i].name)
169: break;
170:
171: if (KEYS_MAX == i) {
172: TBL_MSG(tbl, MANDOCERR_TBLLAYOUT, ln, *pos);
173: return(0);
1.1 schwarze 174: }
175:
1.4 schwarze 176: (*pos)++;
177: c = keys[i].key;
1.1 schwarze 178:
179: /* Extra check for the double-vertical. */
180:
1.4 schwarze 181: if (TBL_CELL_VERT == c && '|' == p[*pos]) {
182: (*pos)++;
1.1 schwarze 183: c = TBL_CELL_DVERT;
1.4 schwarze 184: }
1.1 schwarze 185:
1.4 schwarze 186: /* Disallow adjacent spacers. */
1.1 schwarze 187:
1.4 schwarze 188: if (rp->last && (TBL_CELL_VERT == c || TBL_CELL_DVERT == c) &&
189: (TBL_CELL_VERT == rp->last->pos ||
190: TBL_CELL_DVERT == rp->last->pos)) {
191: TBL_MSG(tbl, MANDOCERR_TBLLAYOUT, ln, *pos - 1);
192: return(0);
193: }
1.1 schwarze 194:
195: /* Allocate cell then parse its modifiers. */
196:
1.4 schwarze 197: return(mods(tbl, cell_alloc(tbl, rp, c), ln, p, pos));
1.1 schwarze 198: }
199:
200:
1.4 schwarze 201: static void
202: row(struct tbl_node *tbl, int ln, const char *p, int *pos)
1.1 schwarze 203: {
204: struct tbl_row *rp;
205:
1.4 schwarze 206: row: /*
1.1 schwarze 207: * EBNF describing this section:
208: *
209: * row ::= row_list [:space:]* [.]?[\n]
210: * row_list ::= [:space:]* row_elem row_tail
211: * row_tail ::= [:space:]*[,] row_list |
212: * epsilon
213: * row_elem ::= [\t\ ]*[:alpha:]+
214: */
215:
1.4 schwarze 216: rp = mandoc_calloc(1, sizeof(struct tbl_row));
217: if (tbl->last_row) {
218: tbl->last_row->next = rp;
219: tbl->last_row = rp;
220: } else
221: tbl->last_row = tbl->first_row = rp;
222:
223: cell:
224: while (isspace((unsigned char)p[*pos]))
225: (*pos)++;
226:
227: /* Safely exit layout context. */
228:
229: if ('.' == p[*pos]) {
1.1 schwarze 230: tbl->part = TBL_PART_DATA;
1.4 schwarze 231: if (NULL == tbl->first_row)
232: TBL_MSG(tbl, MANDOCERR_TBLNOLAYOUT, ln, *pos);
233: (*pos)++;
234: return;
1.1 schwarze 235: }
236:
1.4 schwarze 237: /* End (and possibly restart) a row. */
238:
239: if (',' == p[*pos]) {
240: (*pos)++;
241: goto row;
242: } else if ('\0' == p[*pos])
243: return;
244:
245: if ( ! cell(tbl, rp, ln, p, pos))
246: return;
247:
248: goto cell;
249: /* NOTREACHED */
1.1 schwarze 250: }
251:
252: int
1.4 schwarze 253: tbl_layout(struct tbl_node *tbl, int ln, const char *p)
1.1 schwarze 254: {
255: int pos;
256:
257: pos = 0;
1.4 schwarze 258: row(tbl, ln, p, &pos);
259:
260: /* Always succeed. */
261: return(1);
1.1 schwarze 262: }
1.4 schwarze 263:
264: static struct tbl_cell *
265: cell_alloc(struct tbl_node *tbl, struct tbl_row *rp, enum tbl_cellt pos)
266: {
267: struct tbl_cell *p, *pp;
268: struct tbl_head *h, *hp;
269:
270: p = mandoc_calloc(1, sizeof(struct tbl_cell));
271:
272: if (NULL != (pp = rp->last)) {
273: rp->last->next = p;
274: rp->last = p;
275: } else
276: rp->last = rp->first = p;
277:
278: p->pos = pos;
279:
280: /*
281: * This is a little bit complicated. Here we determine the
282: * header the corresponds to a cell. We add headers dynamically
283: * when need be or re-use them, otherwise. As an example, given
284: * the following:
285: *
286: * 1 c || l
287: * 2 | c | l
288: * 3 l l
289: * 3 || c | l |.
290: *
291: * We first add the new headers (as there are none) in (1); then
292: * in (2) we insert the first spanner (as it doesn't match up
293: * with the header); then we re-use the prior data headers,
294: * skipping over the spanners; then we re-use everything and add
295: * a last spanner. Note that VERT headers are made into DVERT
296: * ones.
297: */
298:
299: h = pp ? pp->head->next : tbl->first_head;
300:
301: if (h) {
302: /* Re-use data header. */
303: if (TBL_HEAD_DATA == h->pos &&
304: (TBL_CELL_VERT != p->pos &&
305: TBL_CELL_DVERT != p->pos)) {
306: p->head = h;
307: return(p);
308: }
309:
310: /* Re-use spanner header. */
311: if (TBL_HEAD_DATA != h->pos &&
312: (TBL_CELL_VERT == p->pos ||
313: TBL_CELL_DVERT == p->pos)) {
314: head_adjust(p, h);
315: p->head = h;
316: return(p);
317: }
318:
319: /* Right-shift headers with a new spanner. */
320: if (TBL_HEAD_DATA == h->pos &&
321: (TBL_CELL_VERT == p->pos ||
322: TBL_CELL_DVERT == p->pos)) {
323: hp = mandoc_calloc(1, sizeof(struct tbl_head));
324: hp->ident = tbl->opts.cols++;
325: hp->prev = h->prev;
326: if (h->prev)
327: h->prev->next = hp;
328: if (h == tbl->first_head)
329: tbl->first_head = hp;
330: h->prev = hp;
331: hp->next = h;
332: head_adjust(p, hp);
333: p->head = hp;
334: return(p);
335: }
336:
337: if (NULL != (h = h->next)) {
338: head_adjust(p, h);
339: p->head = h;
340: return(p);
341: }
342:
343: /* Fall through to default case... */
344: }
345:
346: hp = mandoc_calloc(1, sizeof(struct tbl_head));
347: hp->ident = tbl->opts.cols++;
348:
349: if (tbl->last_head) {
350: hp->prev = tbl->last_head;
351: tbl->last_head->next = hp;
352: tbl->last_head = hp;
353: } else
354: tbl->last_head = tbl->first_head = hp;
355:
356: head_adjust(p, hp);
357: p->head = hp;
358: return(p);
359: }
360:
361: static void
362: head_adjust(const struct tbl_cell *cell, struct tbl_head *head)
363: {
364: if (TBL_CELL_VERT != cell->pos &&
365: TBL_CELL_DVERT != cell->pos) {
366: head->pos = TBL_HEAD_DATA;
367: return;
368: }
369:
370: if (TBL_CELL_VERT == cell->pos)
371: if (TBL_HEAD_DVERT != head->pos)
372: head->pos = TBL_HEAD_VERT;
373:
374: if (TBL_CELL_DVERT == cell->pos)
375: head->pos = TBL_HEAD_DVERT;
376: }
377:
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