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Annotation of mandoc/tbl_opts.c, Revision 1.3

1.3     ! kristaps    1: /*     $Id: tbl_opts.c,v 1.2 2010/12/28 13:47:38 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:        /* Try again... */
1.1       kristaps  239:
1.3     ! kristaps  240:        goto again;
1.1       kristaps  241: }
                    242:
                    243: int
                    244: tbl_option(struct tbl *tbl, int ln, const char *p)
                    245: {
                    246:        int              pos;
                    247:
1.3     ! kristaps  248:        /*
        !           249:         * Table options are always on just one line, so automatically
        !           250:         * switch into the next input mode here.
        !           251:         */
        !           252:        tbl->part = TBL_PART_LAYOUT;
        !           253:
1.1       kristaps  254:        pos = 0;
1.3     ! kristaps  255:        opt(tbl, ln, p, &pos);
        !           256:
        !           257:        /* Always succeed. */
        !           258:        return(1);
1.1       kristaps  259: }

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