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Annotation of mandoc/tbl_opts.c, Revision 1.11

1.11    ! kristaps    1: /*     $Id: tbl_opts.c,v 1.10 2011/03/20 16:02:05 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:  */
1.11    ! kristaps   17: #ifdef HAVE_CONFIG_H
        !            18: #include "config.h"
        !            19: #endif
        !            20:
1.3       kristaps   21: #include <ctype.h>
1.1       kristaps   22: #include <stdio.h>
                     23: #include <stdlib.h>
                     24: #include <string.h>
                     25:
1.3       kristaps   26: #include "mandoc.h"
1.10      kristaps   27: #include "libmandoc.h"
1.1       kristaps   28: #include "libroff.h"
                     29:
                     30: enum   tbl_ident {
                     31:        KEY_CENTRE = 0,
                     32:        KEY_DELIM,
                     33:        KEY_EXPAND,
                     34:        KEY_BOX,
                     35:        KEY_DBOX,
                     36:        KEY_ALLBOX,
                     37:        KEY_TAB,
                     38:        KEY_LINESIZE,
                     39:        KEY_NOKEEP,
                     40:        KEY_DPOINT,
                     41:        KEY_NOSPACE,
                     42:        KEY_FRAME,
                     43:        KEY_DFRAME,
                     44:        KEY_MAX
                     45: };
                     46:
                     47: struct tbl_phrase {
                     48:        const char      *name;
                     49:        int              key;
                     50:        enum tbl_ident   ident;
                     51: };
                     52:
                     53: /* Handle Commonwealth/American spellings. */
                     54: #define        KEY_MAXKEYS      14
                     55:
1.3       kristaps   56: /* Maximum length of key name string. */
                     57: #define        KEY_MAXNAME      13
                     58:
                     59: /* Maximum length of key number size. */
                     60: #define        KEY_MAXNUMSZ     10
                     61:
1.1       kristaps   62: static const struct tbl_phrase keys[KEY_MAXKEYS] = {
                     63:        { "center",      TBL_OPT_CENTRE,        KEY_CENTRE},
                     64:        { "centre",      TBL_OPT_CENTRE,        KEY_CENTRE},
                     65:        { "delim",       0,                     KEY_DELIM},
                     66:        { "expand",      TBL_OPT_EXPAND,        KEY_EXPAND},
                     67:        { "box",         TBL_OPT_BOX,           KEY_BOX},
                     68:        { "doublebox",   TBL_OPT_DBOX,          KEY_DBOX},
                     69:        { "allbox",      TBL_OPT_ALLBOX,        KEY_ALLBOX},
                     70:        { "frame",       TBL_OPT_BOX,           KEY_FRAME},
                     71:        { "doubleframe", TBL_OPT_DBOX,          KEY_DFRAME},
                     72:        { "tab",         0,                     KEY_TAB},
                     73:        { "linesize",    0,                     KEY_LINESIZE},
                     74:        { "nokeep",      TBL_OPT_NOKEEP,        KEY_NOKEEP},
                     75:        { "decimalpoint", 0,                    KEY_DPOINT},
                     76:        { "nospaces",    TBL_OPT_NOSPACE,       KEY_NOSPACE},
                     77: };
                     78:
1.5       kristaps   79: static int              arg(struct tbl_node *, int,
1.7       kristaps   80:                                const char *, int *, enum tbl_ident);
1.5       kristaps   81: static void             opt(struct tbl_node *, int,
                     82:                                const char *, int *);
1.1       kristaps   83:
                     84: static int
1.7       kristaps   85: arg(struct tbl_node *tbl, int ln, const char *p, int *pos, enum tbl_ident key)
1.1       kristaps   86: {
1.3       kristaps   87:        int              i;
                     88:        char             buf[KEY_MAXNUMSZ];
1.1       kristaps   89:
1.3       kristaps   90:        while (isspace((unsigned char)p[*pos]))
                     91:                (*pos)++;
1.1       kristaps   92:
1.3       kristaps   93:        /* Arguments always begin with a parenthesis. */
                     94:
                     95:        if ('(' != p[*pos]) {
1.10      kristaps   96:                mandoc_msg(MANDOCERR_TBL, tbl->parse,
                     97:                                ln, *pos, NULL);
1.1       kristaps   98:                return(0);
                     99:        }
                    100:
1.3       kristaps  101:        (*pos)++;
1.1       kristaps  102:
1.3       kristaps  103:        /*
                    104:         * The arguments can be ANY value, so we can't just stop at the
                    105:         * next close parenthesis (the argument can be a closed
                    106:         * parenthesis itself).
                    107:         */
1.1       kristaps  108:
                    109:        switch (key) {
                    110:        case (KEY_DELIM):
1.6       kristaps  111:                if ('\0' == p[(*pos)++]) {
1.10      kristaps  112:                        mandoc_msg(MANDOCERR_TBL, tbl->parse,
                    113:                                        ln, *pos - 1, NULL);
1.3       kristaps  114:                        return(0);
                    115:                }
                    116:
1.6       kristaps  117:                if ('\0' == p[(*pos)++]) {
1.10      kristaps  118:                        mandoc_msg(MANDOCERR_TBL, tbl->parse,
                    119:                                        ln, *pos - 1, NULL);
1.1       kristaps  120:                        return(0);
1.3       kristaps  121:                }
1.1       kristaps  122:                break;
                    123:        case (KEY_TAB):
1.5       kristaps  124:                if ('\0' != (tbl->opts.tab = p[(*pos)++]))
1.3       kristaps  125:                        break;
                    126:
1.10      kristaps  127:                mandoc_msg(MANDOCERR_TBL, tbl->parse,
                    128:                                ln, *pos - 1, NULL);
1.3       kristaps  129:                return(0);
1.1       kristaps  130:        case (KEY_LINESIZE):
1.3       kristaps  131:                for (i = 0; i < KEY_MAXNUMSZ && p[*pos]; i++, (*pos)++) {
                    132:                        buf[i] = p[*pos];
                    133:                        if ( ! isdigit((unsigned char)buf[i]))
                    134:                                break;
                    135:                }
                    136:
                    137:                if (i < KEY_MAXNUMSZ) {
                    138:                        buf[i] = '\0';
1.5       kristaps  139:                        tbl->opts.linesize = atoi(buf);
1.3       kristaps  140:                        break;
                    141:                }
                    142:
1.10      kristaps  143:                mandoc_msg(MANDOCERR_TBL, tbl->parse, ln, *pos, NULL);
1.3       kristaps  144:                return(0);
1.1       kristaps  145:        case (KEY_DPOINT):
1.5       kristaps  146:                if ('\0' != (tbl->opts.decimal = p[(*pos)++]))
1.3       kristaps  147:                        break;
                    148:
1.10      kristaps  149:                mandoc_msg(MANDOCERR_TBL, tbl->parse,
                    150:                                ln, *pos - 1, NULL);
1.3       kristaps  151:                return(0);
1.1       kristaps  152:        default:
                    153:                abort();
1.3       kristaps  154:                /* NOTREACHED */
1.1       kristaps  155:        }
                    156:
1.3       kristaps  157:        /* End with a close parenthesis. */
1.1       kristaps  158:
1.3       kristaps  159:        if (')' == p[(*pos)++])
                    160:                return(1);
1.1       kristaps  161:
1.10      kristaps  162:        mandoc_msg(MANDOCERR_TBL, tbl->parse, ln, *pos - 1, NULL);
1.3       kristaps  163:        return(0);
1.1       kristaps  164: }
                    165:
1.3       kristaps  166: static void
1.5       kristaps  167: opt(struct tbl_node *tbl, int ln, const char *p, int *pos)
1.1       kristaps  168: {
                    169:        int              i, sv;
1.3       kristaps  170:        char             buf[KEY_MAXNAME];
1.1       kristaps  171:
1.3       kristaps  172:        /*
                    173:         * Parse individual options from the stream as surrounded by
                    174:         * this goto.  Each pass through the routine parses out a single
                    175:         * option and registers it.  Option arguments are processed in
                    176:         * the arg() function.
                    177:         */
1.1       kristaps  178:
1.3       kristaps  179: again: /*
1.1       kristaps  180:         * EBNF describing this section:
                    181:         *
                    182:         * options      ::= option_list [:space:]* [;][\n]
                    183:         * option_list  ::= option option_tail
                    184:         * option_tail  ::= [:space:]+ option_list |
                    185:         *              ::= epsilon
                    186:         * option       ::= [:alpha:]+ args
                    187:         * args         ::= [:space:]* [(] [:alpha:]+ [)]
                    188:         */
                    189:
1.3       kristaps  190:        while (isspace((unsigned char)p[*pos]))
                    191:                (*pos)++;
                    192:
                    193:        /* Safe exit point. */
                    194:
                    195:        if (';' == p[*pos])
                    196:                return;
                    197:
                    198:        /* Copy up to first non-alpha character. */
                    199:
                    200:        for (sv = *pos, i = 0; i < KEY_MAXNAME; i++, (*pos)++) {
1.9       kristaps  201:                buf[i] = (char)tolower((unsigned char)p[*pos]);
1.3       kristaps  202:                if ( ! isalpha((unsigned char)buf[i]))
                    203:                        break;
                    204:        }
                    205:
                    206:        /* Exit if buffer is empty (or overrun). */
                    207:
                    208:        if (KEY_MAXNAME == i || 0 == i) {
1.10      kristaps  209:                mandoc_msg(MANDOCERR_TBL, tbl->parse, ln, *pos, NULL);
1.3       kristaps  210:                return;
1.1       kristaps  211:        }
                    212:
1.3       kristaps  213:        buf[i] = '\0';
                    214:
                    215:        while (isspace((unsigned char)p[*pos]))
                    216:                (*pos)++;
                    217:
                    218:        /*
                    219:         * Look through all of the available keys to find one that
                    220:         * matches the input.  FIXME: hashtable this.
                    221:         */
                    222:
1.1       kristaps  223:        for (i = 0; i < KEY_MAXKEYS; i++) {
1.3       kristaps  224:                if (strcmp(buf, keys[i].name))
1.1       kristaps  225:                        continue;
1.3       kristaps  226:
                    227:                /*
                    228:                 * Note: this is more difficult to recover from, as we
                    229:                 * can be anywhere in the option sequence and it's
                    230:                 * harder to jump to the next.  Meanwhile, just bail out
                    231:                 * of the sequence altogether.
                    232:                 */
                    233:
1.1       kristaps  234:                if (keys[i].key)
1.5       kristaps  235:                        tbl->opts.opts |= keys[i].key;
1.1       kristaps  236:                else if ( ! arg(tbl, ln, p, pos, keys[i].ident))
1.3       kristaps  237:                        return;
1.1       kristaps  238:
                    239:                break;
                    240:        }
                    241:
1.3       kristaps  242:        /*
                    243:         * Allow us to recover from bad options by continuing to another
                    244:         * parse sequence.
                    245:         */
                    246:
1.1       kristaps  247:        if (KEY_MAXKEYS == i)
1.10      kristaps  248:                mandoc_msg(MANDOCERR_TBLOPT, tbl->parse, ln, sv, NULL);
1.3       kristaps  249:
                    250:        goto again;
1.4       kristaps  251:        /* NOTREACHED */
1.1       kristaps  252: }
                    253:
                    254: int
1.5       kristaps  255: tbl_option(struct tbl_node *tbl, int ln, const char *p)
1.1       kristaps  256: {
                    257:        int              pos;
                    258:
1.3       kristaps  259:        /*
                    260:         * Table options are always on just one line, so automatically
                    261:         * switch into the next input mode here.
                    262:         */
                    263:        tbl->part = TBL_PART_LAYOUT;
                    264:
1.1       kristaps  265:        pos = 0;
1.3       kristaps  266:        opt(tbl, ln, p, &pos);
                    267:
                    268:        /* Always succeed. */
                    269:        return(1);
1.1       kristaps  270: }

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