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1.3 ! kristaps 1: /* $Id: tbl_layout.c,v 1.2 2010/12/29 15:21:34 kristaps Exp $ */
1.1 kristaps 2: /*
3: * Copyright (c) 2009, 2010 Kristaps Dzonsons <kristaps@bsd.lv>
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>
21:
22: #include "mandoc.h"
23: #include "libmandoc.h"
24: #include "libroff.h"
25:
26: struct tbl_phrase {
27: char name;
28: enum tbl_cellt key;
29: };
30:
1.2 kristaps 31: #define KEYS_MAX 11
1.1 kristaps 32:
33: static const struct tbl_phrase keys[KEYS_MAX] = {
34: { 'c', TBL_CELL_CENTRE },
35: { 'r', TBL_CELL_RIGHT },
36: { 'l', TBL_CELL_LEFT },
37: { 'n', TBL_CELL_NUMBER },
38: { 's', TBL_CELL_SPAN },
39: { 'a', TBL_CELL_LONG },
40: { '^', TBL_CELL_DOWN },
41: { '-', TBL_CELL_HORIZ },
42: { '_', TBL_CELL_HORIZ },
43: { '=', TBL_CELL_DHORIZ },
44: { '|', TBL_CELL_VERT }
45: };
46:
47: static int mods(struct tbl *, struct tbl_cell *,
48: int, const char *, int *);
49: static int cell(struct tbl *, struct tbl_row *,
50: int, const char *, int *);
51: static void row(struct tbl *, int, const char *, int *);
52:
53: static int
54: mods(struct tbl *tbl, struct tbl_cell *cp,
55: int ln, const char *p, int *pos)
56: {
57: char buf[5];
58: int i;
59:
60: mod:
61: /*
62: * XXX: since, at least for now, modifiers are non-conflicting
63: * (are separable by value, regardless of position), we let
64: * modifiers come in any order. The existing tbl doesn't let
65: * this happen.
66: */
67: switch (p[*pos]) {
68: case ('\0'):
69: /* FALLTHROUGH */
70: case (' '):
71: /* FALLTHROUGH */
72: case ('\t'):
73: /* FALLTHROUGH */
74: case (','):
75: /* FALLTHROUGH */
76: case ('.'):
77: return(1);
78: default:
79: break;
80: }
81:
82: /* Parse numerical spacing from modifier string. */
83:
84: if (isdigit((unsigned char)p[*pos])) {
85: for (i = 0; i < 4; i++) {
86: if ( ! isdigit((unsigned char)p[*pos + i]))
87: break;
88: buf[i] = p[*pos + i];
89: }
90: buf[i] = '\0';
91:
92: /* No greater than 4 digits. */
93:
94: if (4 == i) {
95: TBL_MSG(tbl, MANDOCERR_TBLLAYOUT, ln, *pos);
96: return(0);
97: }
98:
99: *pos += i;
100: cp->spacing = atoi(buf);
101:
102: goto mod;
103: /* NOTREACHED */
104: }
105:
106: /* TODO: GNU has many more extensions. */
107:
1.2 kristaps 108: switch (tolower(p[(*pos)++])) {
1.1 kristaps 109: case ('z'):
110: cp->flags |= TBL_CELL_WIGN;
111: goto mod;
112: case ('u'):
113: cp->flags |= TBL_CELL_UP;
114: goto mod;
115: case ('e'):
116: cp->flags |= TBL_CELL_EQUAL;
117: goto mod;
118: case ('t'):
119: cp->flags |= TBL_CELL_TALIGN;
120: goto mod;
121: case ('d'):
122: cp->flags |= TBL_CELL_BALIGN;
123: goto mod;
124: case ('f'):
1.2 kristaps 125: break;
1.1 kristaps 126: case ('b'):
127: /* FALLTHROUGH */
128: case ('i'):
1.2 kristaps 129: (*pos)--;
1.1 kristaps 130: break;
131: default:
132: TBL_MSG(tbl, MANDOCERR_TBLLAYOUT, ln, *pos - 1);
133: return(0);
134: }
135:
1.2 kristaps 136: switch (tolower(p[(*pos)++])) {
1.1 kristaps 137: case ('b'):
138: cp->flags |= TBL_CELL_BOLD;
139: goto mod;
140: case ('i'):
141: cp->flags |= TBL_CELL_ITALIC;
142: goto mod;
143: default:
144: break;
145: }
146:
147: TBL_MSG(tbl, MANDOCERR_TBLLAYOUT, ln, *pos - 1);
148: return(0);
149: }
150:
151: static int
152: cell(struct tbl *tbl, struct tbl_row *rp,
153: int ln, const char *p, int *pos)
154: {
155: struct tbl_cell *cp;
156: int i;
157: enum tbl_cellt c;
158:
159: /* Parse the column position (`r', `R', `|', ...). */
160:
161: for (i = 0; i < KEYS_MAX; i++)
1.2 kristaps 162: if (tolower(p[*pos]) == keys[i].name)
1.1 kristaps 163: break;
164:
165: if (KEYS_MAX == i) {
166: TBL_MSG(tbl, MANDOCERR_TBLLAYOUT, ln, *pos);
167: return(0);
168: }
169:
170: (*pos)++;
171: c = keys[i].key;
172:
173: /* Extra check for the double-vertical. */
174:
175: if (TBL_CELL_VERT == c && '|' == p[*pos]) {
176: (*pos)++;
177: c = TBL_CELL_DVERT;
178: }
179:
180: /* Disallow adjacent spacers. */
181:
182: if (rp->last && (TBL_CELL_VERT == c || TBL_CELL_DVERT == c) &&
183: (TBL_CELL_VERT == rp->last->pos ||
184: TBL_CELL_DVERT == rp->last->pos)) {
185: TBL_MSG(tbl, MANDOCERR_TBLLAYOUT, ln, *pos - 1);
186: return(0);
187: }
188:
189: /* Allocate cell then parse its modifiers. */
190:
191: cp = mandoc_calloc(1, sizeof(struct tbl_cell));
192: cp->pos = c;
193:
194: if (rp->last) {
195: rp->last->next = cp;
196: rp->last = cp;
197: } else
198: rp->last = rp->first = cp;
199:
200: return(mods(tbl, cp, ln, p, pos));
201: }
202:
203:
204: static void
205: row(struct tbl *tbl, int ln, const char *p, int *pos)
206: {
207: struct tbl_row *rp;
208:
209: row: /*
210: * EBNF describing this section:
211: *
212: * row ::= row_list [:space:]* [.]?[\n]
213: * row_list ::= [:space:]* row_elem row_tail
214: * row_tail ::= [:space:]*[,] row_list |
215: * epsilon
216: * row_elem ::= [\t\ ]*[:alpha:]+
217: */
218:
219: rp = mandoc_calloc(1, sizeof(struct tbl_row));
1.3 ! kristaps 220: if (tbl->last_row) {
! 221: tbl->last_row->next = rp;
! 222: tbl->last_row = rp;
1.1 kristaps 223: } else
1.3 ! kristaps 224: tbl->last_row = tbl->first_row = rp;
1.1 kristaps 225:
226: cell:
227: while (isspace((unsigned char)p[*pos]))
228: (*pos)++;
229:
230: /* Safely exit layout context. */
231:
232: if ('.' == p[*pos]) {
233: tbl->part = TBL_PART_DATA;
1.3 ! kristaps 234: if (NULL == tbl->first_row)
1.1 kristaps 235: TBL_MSG(tbl, MANDOCERR_TBLNOLAYOUT, ln, *pos);
236: (*pos)++;
237: return;
238: }
239:
240: /* End (and possibly restart) a row. */
241:
242: if (',' == p[*pos]) {
243: (*pos)++;
244: goto row;
245: } else if ('\0' == p[*pos])
246: return;
247:
248: if ( ! cell(tbl, rp, ln, p, pos))
249: return;
250:
251: goto cell;
252: /* NOTREACHED */
253: }
254:
255:
256: int
257: tbl_layout(struct tbl *tbl, int ln, const char *p)
258: {
259: int pos;
260:
261: pos = 0;
262: row(tbl, ln, p, &pos);
263:
264: /* Always succeed. */
265: return(1);
266: }