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Annotation of mandoc/tbl_opts.c, Revision 1.15

1.15    ! schwarze    1: /*     $Id: tbl_opts.c,v 1.14 2014/08/10 23:54:41 schwarze Exp $ */
1.1       kristaps    2: /*
1.12      schwarze    3:  * Copyright (c) 2009, 2010, 2011 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: #include "config.h"
1.14      schwarze   18:
                     19: #include <sys/types.h>
1.11      kristaps   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},
1.13      schwarze   65:        { "delim",       0,                     KEY_DELIM},
1.1       kristaps   66:        { "expand",      TBL_OPT_EXPAND,        KEY_EXPAND},
1.13      schwarze   67:        { "box",         TBL_OPT_BOX,           KEY_BOX},
                     68:        { "doublebox",   TBL_OPT_DBOX,          KEY_DBOX},
1.1       kristaps   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:
1.13      schwarze   79: static int              arg(struct tbl_node *, int,
1.7       kristaps   80:                                const char *, int *, enum tbl_ident);
1.13      schwarze   81: static void             opt(struct tbl_node *, int,
1.5       kristaps   82:                                const char *, int *);
1.1       kristaps   83:
1.13      schwarze   84:
1.1       kristaps   85: static int
1.7       kristaps   86: arg(struct tbl_node *tbl, int ln, const char *p, int *pos, enum tbl_ident key)
1.1       kristaps   87: {
1.3       kristaps   88:        int              i;
                     89:        char             buf[KEY_MAXNUMSZ];
1.1       kristaps   90:
1.3       kristaps   91:        while (isspace((unsigned char)p[*pos]))
                     92:                (*pos)++;
1.1       kristaps   93:
1.3       kristaps   94:        /* Arguments always begin with a parenthesis. */
                     95:
                     96:        if ('(' != p[*pos]) {
1.13      schwarze   97:                mandoc_msg(MANDOCERR_TBL, tbl->parse,
                     98:                    ln, *pos, NULL);
1.1       kristaps   99:                return(0);
                    100:        }
                    101:
1.3       kristaps  102:        (*pos)++;
1.1       kristaps  103:
1.3       kristaps  104:        /*
                    105:         * The arguments can be ANY value, so we can't just stop at the
                    106:         * next close parenthesis (the argument can be a closed
                    107:         * parenthesis itself).
                    108:         */
1.1       kristaps  109:
                    110:        switch (key) {
1.13      schwarze  111:        case KEY_DELIM:
1.6       kristaps  112:                if ('\0' == p[(*pos)++]) {
1.10      kristaps  113:                        mandoc_msg(MANDOCERR_TBL, tbl->parse,
1.13      schwarze  114:                            ln, *pos - 1, NULL);
1.3       kristaps  115:                        return(0);
1.13      schwarze  116:                }
1.3       kristaps  117:
1.6       kristaps  118:                if ('\0' == p[(*pos)++]) {
1.10      kristaps  119:                        mandoc_msg(MANDOCERR_TBL, tbl->parse,
1.13      schwarze  120:                            ln, *pos - 1, NULL);
1.1       kristaps  121:                        return(0);
1.13      schwarze  122:                }
1.1       kristaps  123:                break;
1.13      schwarze  124:        case KEY_TAB:
1.5       kristaps  125:                if ('\0' != (tbl->opts.tab = p[(*pos)++]))
1.3       kristaps  126:                        break;
                    127:
1.10      kristaps  128:                mandoc_msg(MANDOCERR_TBL, tbl->parse,
1.13      schwarze  129:                    ln, *pos - 1, NULL);
1.3       kristaps  130:                return(0);
1.13      schwarze  131:        case KEY_LINESIZE:
1.3       kristaps  132:                for (i = 0; i < KEY_MAXNUMSZ && p[*pos]; i++, (*pos)++) {
                    133:                        buf[i] = p[*pos];
                    134:                        if ( ! isdigit((unsigned char)buf[i]))
                    135:                                break;
                    136:                }
                    137:
                    138:                if (i < KEY_MAXNUMSZ) {
                    139:                        buf[i] = '\0';
1.5       kristaps  140:                        tbl->opts.linesize = atoi(buf);
1.3       kristaps  141:                        break;
                    142:                }
                    143:
1.10      kristaps  144:                mandoc_msg(MANDOCERR_TBL, tbl->parse, ln, *pos, NULL);
1.3       kristaps  145:                return(0);
1.13      schwarze  146:        case KEY_DPOINT:
1.5       kristaps  147:                if ('\0' != (tbl->opts.decimal = p[(*pos)++]))
1.3       kristaps  148:                        break;
                    149:
1.13      schwarze  150:                mandoc_msg(MANDOCERR_TBL, tbl->parse,
                    151:                    ln, *pos - 1, NULL);
1.3       kristaps  152:                return(0);
1.1       kristaps  153:        default:
                    154:                abort();
1.3       kristaps  155:                /* NOTREACHED */
1.1       kristaps  156:        }
                    157:
1.3       kristaps  158:        /* End with a close parenthesis. */
1.1       kristaps  159:
1.3       kristaps  160:        if (')' == p[(*pos)++])
                    161:                return(1);
1.1       kristaps  162:
1.10      kristaps  163:        mandoc_msg(MANDOCERR_TBL, tbl->parse, ln, *pos - 1, NULL);
1.3       kristaps  164:        return(0);
1.1       kristaps  165: }
                    166:
1.3       kristaps  167: static void
1.5       kristaps  168: opt(struct tbl_node *tbl, int ln, const char *p, int *pos)
1.1       kristaps  169: {
                    170:        int              i, sv;
1.3       kristaps  171:        char             buf[KEY_MAXNAME];
1.1       kristaps  172:
1.3       kristaps  173:        /*
                    174:         * Parse individual options from the stream as surrounded by
                    175:         * this goto.  Each pass through the routine parses out a single
                    176:         * option and registers it.  Option arguments are processed in
                    177:         * the arg() function.
                    178:         */
1.1       kristaps  179:
1.3       kristaps  180: again: /*
1.1       kristaps  181:         * EBNF describing this section:
                    182:         *
                    183:         * options      ::= option_list [:space:]* [;][\n]
                    184:         * option_list  ::= option option_tail
1.15    ! schwarze  185:         * option_tail  ::= [,:space:]+ option_list |
1.13      schwarze  186:         *              ::= epsilon
1.1       kristaps  187:         * option       ::= [:alpha:]+ args
                    188:         * args         ::= [:space:]* [(] [:alpha:]+ [)]
                    189:         */
                    190:
1.3       kristaps  191:        while (isspace((unsigned char)p[*pos]))
                    192:                (*pos)++;
                    193:
                    194:        /* Safe exit point. */
                    195:
                    196:        if (';' == p[*pos])
                    197:                return;
                    198:
                    199:        /* Copy up to first non-alpha character. */
                    200:
                    201:        for (sv = *pos, i = 0; i < KEY_MAXNAME; i++, (*pos)++) {
1.9       kristaps  202:                buf[i] = (char)tolower((unsigned char)p[*pos]);
1.3       kristaps  203:                if ( ! isalpha((unsigned char)buf[i]))
                    204:                        break;
                    205:        }
                    206:
                    207:        /* Exit if buffer is empty (or overrun). */
                    208:
                    209:        if (KEY_MAXNAME == i || 0 == i) {
1.10      kristaps  210:                mandoc_msg(MANDOCERR_TBL, tbl->parse, ln, *pos, NULL);
1.3       kristaps  211:                return;
1.1       kristaps  212:        }
                    213:
1.3       kristaps  214:        buf[i] = '\0';
                    215:
1.15    ! schwarze  216:        while (isspace((unsigned char)p[*pos]) || p[*pos] == ',')
1.3       kristaps  217:                (*pos)++;
                    218:
1.13      schwarze  219:        /*
1.3       kristaps  220:         * Look through all of the available keys to find one that
                    221:         * matches the input.  FIXME: hashtable this.
                    222:         */
                    223:
1.1       kristaps  224:        for (i = 0; i < KEY_MAXKEYS; i++) {
1.3       kristaps  225:                if (strcmp(buf, keys[i].name))
1.1       kristaps  226:                        continue;
1.3       kristaps  227:
                    228:                /*
                    229:                 * Note: this is more difficult to recover from, as we
                    230:                 * can be anywhere in the option sequence and it's
                    231:                 * harder to jump to the next.  Meanwhile, just bail out
                    232:                 * of the sequence altogether.
                    233:                 */
                    234:
1.13      schwarze  235:                if (keys[i].key)
1.5       kristaps  236:                        tbl->opts.opts |= keys[i].key;
1.1       kristaps  237:                else if ( ! arg(tbl, ln, p, pos, keys[i].ident))
1.3       kristaps  238:                        return;
1.1       kristaps  239:
                    240:                break;
                    241:        }
                    242:
1.13      schwarze  243:        /*
1.3       kristaps  244:         * Allow us to recover from bad options by continuing to another
                    245:         * parse sequence.
                    246:         */
                    247:
1.1       kristaps  248:        if (KEY_MAXKEYS == i)
1.10      kristaps  249:                mandoc_msg(MANDOCERR_TBLOPT, tbl->parse, ln, sv, NULL);
1.3       kristaps  250:
                    251:        goto again;
1.4       kristaps  252:        /* NOTREACHED */
1.1       kristaps  253: }
                    254:
                    255: int
1.5       kristaps  256: tbl_option(struct tbl_node *tbl, int ln, const char *p)
1.1       kristaps  257: {
                    258:        int              pos;
                    259:
1.3       kristaps  260:        /*
                    261:         * Table options are always on just one line, so automatically
                    262:         * switch into the next input mode here.
                    263:         */
                    264:        tbl->part = TBL_PART_LAYOUT;
                    265:
1.1       kristaps  266:        pos = 0;
1.3       kristaps  267:        opt(tbl, ln, p, &pos);
                    268:
                    269:        /* Always succeed. */
                    270:        return(1);
1.1       kristaps  271: }

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