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Annotation of mandoc/tbl_opts.c, Revision 1.6

1.6     ! kristaps    1: /*     $Id: tbl_opts.c,v 1.5 2011/01/02 10:10:57 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:
1.5       kristaps   74: static int              arg(struct tbl_node *, int,
                     75:                                const char *, int *, int);
                     76: static void             opt(struct tbl_node *, int,
                     77:                                const char *, int *);
1.1       kristaps   78:
                     79: static int
1.5       kristaps   80: arg(struct tbl_node *tbl, int ln, const char *p, int *pos, int key)
1.1       kristaps   81: {
1.3       kristaps   82:        int              i;
                     83:        char             buf[KEY_MAXNUMSZ];
1.1       kristaps   84:
1.3       kristaps   85:        while (isspace((unsigned char)p[*pos]))
                     86:                (*pos)++;
1.1       kristaps   87:
1.3       kristaps   88:        /* Arguments always begin with a parenthesis. */
                     89:
                     90:        if ('(' != p[*pos]) {
                     91:                TBL_MSG(tbl, MANDOCERR_TBL, ln, *pos);
1.1       kristaps   92:                return(0);
                     93:        }
                     94:
1.3       kristaps   95:        (*pos)++;
1.1       kristaps   96:
1.3       kristaps   97:        /*
                     98:         * The arguments can be ANY value, so we can't just stop at the
                     99:         * next close parenthesis (the argument can be a closed
                    100:         * parenthesis itself).
                    101:         */
1.1       kristaps  102:
                    103:        switch (key) {
                    104:        case (KEY_DELIM):
1.6     ! kristaps  105:                if ('\0' == p[(*pos)++]) {
1.3       kristaps  106:                        TBL_MSG(tbl, MANDOCERR_TBL, ln, *pos - 1);
                    107:                        return(0);
                    108:                }
                    109:
1.6     ! kristaps  110:                if ('\0' == p[(*pos)++]) {
1.3       kristaps  111:                        TBL_MSG(tbl, MANDOCERR_TBL, ln, *pos - 1);
1.1       kristaps  112:                        return(0);
1.3       kristaps  113:                }
1.1       kristaps  114:                break;
                    115:        case (KEY_TAB):
1.5       kristaps  116:                if ('\0' != (tbl->opts.tab = p[(*pos)++]))
1.3       kristaps  117:                        break;
                    118:
                    119:                TBL_MSG(tbl, MANDOCERR_TBL, ln, *pos - 1);
                    120:                return(0);
1.1       kristaps  121:        case (KEY_LINESIZE):
1.3       kristaps  122:                for (i = 0; i < KEY_MAXNUMSZ && p[*pos]; i++, (*pos)++) {
                    123:                        buf[i] = p[*pos];
                    124:                        if ( ! isdigit((unsigned char)buf[i]))
                    125:                                break;
                    126:                }
                    127:
                    128:                if (i < KEY_MAXNUMSZ) {
                    129:                        buf[i] = '\0';
1.5       kristaps  130:                        tbl->opts.linesize = atoi(buf);
1.3       kristaps  131:                        break;
                    132:                }
                    133:
                    134:                (*tbl->msg)(MANDOCERR_TBL, tbl->data, ln, *pos, NULL);
                    135:                return(0);
1.1       kristaps  136:        case (KEY_DPOINT):
1.5       kristaps  137:                if ('\0' != (tbl->opts.decimal = p[(*pos)++]))
1.3       kristaps  138:                        break;
                    139:
                    140:                TBL_MSG(tbl, MANDOCERR_TBL, ln, *pos - 1);
                    141:                return(0);
1.1       kristaps  142:        default:
                    143:                abort();
1.3       kristaps  144:                /* NOTREACHED */
1.1       kristaps  145:        }
                    146:
1.3       kristaps  147:        /* End with a close parenthesis. */
1.1       kristaps  148:
1.3       kristaps  149:        if (')' == p[(*pos)++])
                    150:                return(1);
1.1       kristaps  151:
1.3       kristaps  152:        TBL_MSG(tbl, MANDOCERR_TBL, ln, *pos - 1);
                    153:        return(0);
1.1       kristaps  154: }
                    155:
1.3       kristaps  156: static void
1.5       kristaps  157: opt(struct tbl_node *tbl, int ln, const char *p, int *pos)
1.1       kristaps  158: {
                    159:        int              i, sv;
1.3       kristaps  160:        char             buf[KEY_MAXNAME];
1.1       kristaps  161:
1.3       kristaps  162:        /*
                    163:         * Parse individual options from the stream as surrounded by
                    164:         * this goto.  Each pass through the routine parses out a single
                    165:         * option and registers it.  Option arguments are processed in
                    166:         * the arg() function.
                    167:         */
1.1       kristaps  168:
1.3       kristaps  169: again: /*
1.1       kristaps  170:         * EBNF describing this section:
                    171:         *
                    172:         * options      ::= option_list [:space:]* [;][\n]
                    173:         * option_list  ::= option option_tail
                    174:         * option_tail  ::= [:space:]+ option_list |
                    175:         *              ::= epsilon
                    176:         * option       ::= [:alpha:]+ args
                    177:         * args         ::= [:space:]* [(] [:alpha:]+ [)]
                    178:         */
                    179:
1.3       kristaps  180:        while (isspace((unsigned char)p[*pos]))
                    181:                (*pos)++;
                    182:
                    183:        /* Safe exit point. */
                    184:
                    185:        if (';' == p[*pos])
                    186:                return;
                    187:
                    188:        /* Copy up to first non-alpha character. */
                    189:
                    190:        for (sv = *pos, i = 0; i < KEY_MAXNAME; i++, (*pos)++) {
                    191:                buf[i] = tolower(p[*pos]);
                    192:                if ( ! isalpha((unsigned char)buf[i]))
                    193:                        break;
                    194:        }
                    195:
                    196:        /* Exit if buffer is empty (or overrun). */
                    197:
                    198:        if (KEY_MAXNAME == i || 0 == i) {
                    199:                TBL_MSG(tbl, MANDOCERR_TBL, ln, *pos);
                    200:                return;
1.1       kristaps  201:        }
                    202:
1.3       kristaps  203:        buf[i] = '\0';
                    204:
                    205:        while (isspace((unsigned char)p[*pos]))
                    206:                (*pos)++;
                    207:
                    208:        /*
                    209:         * Look through all of the available keys to find one that
                    210:         * matches the input.  FIXME: hashtable this.
                    211:         */
                    212:
1.1       kristaps  213:        for (i = 0; i < KEY_MAXKEYS; i++) {
1.3       kristaps  214:                if (strcmp(buf, keys[i].name))
1.1       kristaps  215:                        continue;
1.3       kristaps  216:
                    217:                /*
                    218:                 * Note: this is more difficult to recover from, as we
                    219:                 * can be anywhere in the option sequence and it's
                    220:                 * harder to jump to the next.  Meanwhile, just bail out
                    221:                 * of the sequence altogether.
                    222:                 */
                    223:
1.1       kristaps  224:                if (keys[i].key)
1.5       kristaps  225:                        tbl->opts.opts |= keys[i].key;
1.1       kristaps  226:                else if ( ! arg(tbl, ln, p, pos, keys[i].ident))
1.3       kristaps  227:                        return;
1.1       kristaps  228:
                    229:                break;
                    230:        }
                    231:
1.3       kristaps  232:        /*
                    233:         * Allow us to recover from bad options by continuing to another
                    234:         * parse sequence.
                    235:         */
                    236:
1.1       kristaps  237:        if (KEY_MAXKEYS == i)
1.3       kristaps  238:                TBL_MSG(tbl, MANDOCERR_TBLOPT, ln, sv);
                    239:
                    240:        goto again;
1.4       kristaps  241:        /* NOTREACHED */
1.1       kristaps  242: }
                    243:
                    244: int
1.5       kristaps  245: tbl_option(struct tbl_node *tbl, int ln, const char *p)
1.1       kristaps  246: {
                    247:        int              pos;
                    248:
1.3       kristaps  249:        /*
                    250:         * Table options are always on just one line, so automatically
                    251:         * switch into the next input mode here.
                    252:         */
                    253:        tbl->part = TBL_PART_LAYOUT;
                    254:
1.1       kristaps  255:        pos = 0;
1.3       kristaps  256:        opt(tbl, ln, p, &pos);
                    257:
                    258:        /* Always succeed. */
                    259:        return(1);
1.1       kristaps  260: }

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