Annotation of mandoc/tbl_opts.c, Revision 1.4
1.4 ! kristaps 1: /* $Id: tbl_opts.c,v 1.3 2010/12/29 01:16:57 kristaps Exp $ */
1.1 kristaps 2: /*
1.2 kristaps 3: * Copyright (c) 2009, 2010 Kristaps Dzonsons <kristaps@bsd.lv>
1.1 kristaps 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: */
1.3 kristaps 17: #include <ctype.h>
1.1 kristaps 18: #include <stdio.h>
19: #include <stdlib.h>
20: #include <string.h>
21:
1.3 kristaps 22: #include "mandoc.h"
1.1 kristaps 23: #include "libroff.h"
24:
25: enum tbl_ident {
26: KEY_CENTRE = 0,
27: KEY_DELIM,
28: KEY_EXPAND,
29: KEY_BOX,
30: KEY_DBOX,
31: KEY_ALLBOX,
32: KEY_TAB,
33: KEY_LINESIZE,
34: KEY_NOKEEP,
35: KEY_DPOINT,
36: KEY_NOSPACE,
37: KEY_FRAME,
38: KEY_DFRAME,
39: KEY_MAX
40: };
41:
42: struct tbl_phrase {
43: const char *name;
44: int key;
45: enum tbl_ident ident;
46: };
47:
48: /* Handle Commonwealth/American spellings. */
49: #define KEY_MAXKEYS 14
50:
1.3 kristaps 51: /* Maximum length of key name string. */
52: #define KEY_MAXNAME 13
53:
54: /* Maximum length of key number size. */
55: #define KEY_MAXNUMSZ 10
56:
1.1 kristaps 57: static const struct tbl_phrase keys[KEY_MAXKEYS] = {
58: { "center", TBL_OPT_CENTRE, KEY_CENTRE},
59: { "centre", TBL_OPT_CENTRE, KEY_CENTRE},
60: { "delim", 0, KEY_DELIM},
61: { "expand", TBL_OPT_EXPAND, KEY_EXPAND},
62: { "box", TBL_OPT_BOX, KEY_BOX},
63: { "doublebox", TBL_OPT_DBOX, KEY_DBOX},
64: { "allbox", TBL_OPT_ALLBOX, KEY_ALLBOX},
65: { "frame", TBL_OPT_BOX, KEY_FRAME},
66: { "doubleframe", TBL_OPT_DBOX, KEY_DFRAME},
67: { "tab", 0, KEY_TAB},
68: { "linesize", 0, KEY_LINESIZE},
69: { "nokeep", TBL_OPT_NOKEEP, KEY_NOKEEP},
70: { "decimalpoint", 0, KEY_DPOINT},
71: { "nospaces", TBL_OPT_NOSPACE, KEY_NOSPACE},
72: };
73:
74: static int arg(struct tbl *, int, const char *, int *, int);
1.3 kristaps 75: static void opt(struct tbl *, int, const char *, int *);
1.1 kristaps 76:
77: static int
78: arg(struct tbl *tbl, int ln, const char *p, int *pos, int key)
79: {
1.3 kristaps 80: int i;
81: char buf[KEY_MAXNUMSZ];
1.1 kristaps 82:
1.3 kristaps 83: while (isspace((unsigned char)p[*pos]))
84: (*pos)++;
1.1 kristaps 85:
1.3 kristaps 86: /* Arguments always begin with a parenthesis. */
87:
88: if ('(' != p[*pos]) {
89: TBL_MSG(tbl, MANDOCERR_TBL, ln, *pos);
1.1 kristaps 90: return(0);
91: }
92:
1.3 kristaps 93: (*pos)++;
1.1 kristaps 94:
1.3 kristaps 95: /*
96: * The arguments can be ANY value, so we can't just stop at the
97: * next close parenthesis (the argument can be a closed
98: * parenthesis itself).
99: */
1.1 kristaps 100:
101: switch (key) {
102: case (KEY_DELIM):
1.3 kristaps 103: if ('\0' == (tbl->delims[0] = p[(*pos)++])) {
104: TBL_MSG(tbl, MANDOCERR_TBL, ln, *pos - 1);
105: return(0);
106: }
107:
108: if ('\0' == (tbl->delims[1] = p[(*pos)++])) {
109: TBL_MSG(tbl, MANDOCERR_TBL, ln, *pos - 1);
1.1 kristaps 110: return(0);
1.3 kristaps 111: }
1.1 kristaps 112: break;
113: case (KEY_TAB):
1.3 kristaps 114: if ('\0' != (tbl->tab = p[(*pos)++]))
115: break;
116:
117: TBL_MSG(tbl, MANDOCERR_TBL, ln, *pos - 1);
118: return(0);
1.1 kristaps 119: case (KEY_LINESIZE):
1.3 kristaps 120: for (i = 0; i < KEY_MAXNUMSZ && p[*pos]; i++, (*pos)++) {
121: buf[i] = p[*pos];
122: if ( ! isdigit((unsigned char)buf[i]))
123: break;
124: }
125:
126: if (i < KEY_MAXNUMSZ) {
127: buf[i] = '\0';
128: tbl->linesize = atoi(buf);
129: break;
130: }
131:
132: (*tbl->msg)(MANDOCERR_TBL, tbl->data, ln, *pos, NULL);
133: return(0);
1.1 kristaps 134: case (KEY_DPOINT):
1.3 kristaps 135: if ('\0' != (tbl->decimal = p[(*pos)++]))
136: break;
137:
138: TBL_MSG(tbl, MANDOCERR_TBL, ln, *pos - 1);
139: return(0);
1.1 kristaps 140: default:
141: abort();
1.3 kristaps 142: /* NOTREACHED */
1.1 kristaps 143: }
144:
1.3 kristaps 145: /* End with a close parenthesis. */
1.1 kristaps 146:
1.3 kristaps 147: if (')' == p[(*pos)++])
148: return(1);
1.1 kristaps 149:
1.3 kristaps 150: TBL_MSG(tbl, MANDOCERR_TBL, ln, *pos - 1);
151: return(0);
1.1 kristaps 152: }
153:
1.3 kristaps 154: static void
1.1 kristaps 155: opt(struct tbl *tbl, int ln, const char *p, int *pos)
156: {
157: int i, sv;
1.3 kristaps 158: char buf[KEY_MAXNAME];
1.1 kristaps 159:
1.3 kristaps 160: /*
161: * Parse individual options from the stream as surrounded by
162: * this goto. Each pass through the routine parses out a single
163: * option and registers it. Option arguments are processed in
164: * the arg() function.
165: */
1.1 kristaps 166:
1.3 kristaps 167: again: /*
1.1 kristaps 168: * EBNF describing this section:
169: *
170: * options ::= option_list [:space:]* [;][\n]
171: * option_list ::= option option_tail
172: * option_tail ::= [:space:]+ option_list |
173: * ::= epsilon
174: * option ::= [:alpha:]+ args
175: * args ::= [:space:]* [(] [:alpha:]+ [)]
176: */
177:
1.3 kristaps 178: while (isspace((unsigned char)p[*pos]))
179: (*pos)++;
180:
181: /* Safe exit point. */
182:
183: if (';' == p[*pos])
184: return;
185:
186: /* Copy up to first non-alpha character. */
187:
188: for (sv = *pos, i = 0; i < KEY_MAXNAME; i++, (*pos)++) {
189: buf[i] = tolower(p[*pos]);
190: if ( ! isalpha((unsigned char)buf[i]))
191: break;
192: }
193:
194: /* Exit if buffer is empty (or overrun). */
195:
196: if (KEY_MAXNAME == i || 0 == i) {
197: TBL_MSG(tbl, MANDOCERR_TBL, ln, *pos);
198: return;
1.1 kristaps 199: }
200:
1.3 kristaps 201: buf[i] = '\0';
202:
203: while (isspace((unsigned char)p[*pos]))
204: (*pos)++;
205:
206: /*
207: * Look through all of the available keys to find one that
208: * matches the input. FIXME: hashtable this.
209: */
210:
1.1 kristaps 211: for (i = 0; i < KEY_MAXKEYS; i++) {
1.3 kristaps 212: if (strcmp(buf, keys[i].name))
1.1 kristaps 213: continue;
1.3 kristaps 214:
215: /*
216: * Note: this is more difficult to recover from, as we
217: * can be anywhere in the option sequence and it's
218: * harder to jump to the next. Meanwhile, just bail out
219: * of the sequence altogether.
220: */
221:
1.1 kristaps 222: if (keys[i].key)
223: tbl->opts |= keys[i].key;
224: else if ( ! arg(tbl, ln, p, pos, keys[i].ident))
1.3 kristaps 225: return;
1.1 kristaps 226:
227: break;
228: }
229:
1.3 kristaps 230: /*
231: * Allow us to recover from bad options by continuing to another
232: * parse sequence.
233: */
234:
1.1 kristaps 235: if (KEY_MAXKEYS == i)
1.3 kristaps 236: TBL_MSG(tbl, MANDOCERR_TBLOPT, ln, sv);
237:
238: goto again;
1.4 ! kristaps 239: /* NOTREACHED */
1.1 kristaps 240: }
241:
242: int
243: tbl_option(struct tbl *tbl, int ln, const char *p)
244: {
245: int pos;
246:
1.3 kristaps 247: /*
248: * Table options are always on just one line, so automatically
249: * switch into the next input mode here.
250: */
251: tbl->part = TBL_PART_LAYOUT;
252:
1.1 kristaps 253: pos = 0;
1.3 kristaps 254: opt(tbl, ln, p, &pos);
255:
256: /* Always succeed. */
257: return(1);
1.1 kristaps 258: }
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