/******************************************************************************
Copyright (c) 1992, 1995, 1996 Xerox Corporation. All rights reserved.
Portions of this code were written by Stephen White, aka ghond.
Use and copying of this software and preparation of derivative works based
upon this software are permitted. Any distribution of this software or
derivative works must comply with all applicable United States export
control laws. This software is made available AS IS, and Xerox Corporation
makes no warranty about the software, its performance or its conformity to
any specification. Any person obtaining a copy of this software is requested
to send their name and post office or electronic mail address to:
Pavel Curtis
Xerox PARC
3333 Coyote Hill Rd.
Palo Alto, CA 94304
Pavel@Xerox.Com
*****************************************************************************/
#include "my-ctype.h"
#include "my-stdio.h"
#include "my-stdlib.h"
#include "my-string.h"
#include "my-time.h"
#include "config.h"
#include "db.h"
#include "list.h"
#include "match.h"
#include "parse_cmd.h"
#include "storage.h"
#include "structures.h"
#include "utils.h"
char **
parse_into_words(char *input, int *nwords)
{
static char **words = 0;
static int max_words = 0;
int in_quotes = 0;
char *ptr = input;
if (!words) {
max_words = 50;
words = mymalloc(max_words * sizeof(char *), M_STRING);
}
while (*input == ' ')
input++;
for (*nwords = 0; *input != '\0'; (*nwords)++) {
if (*nwords == max_words) {
int new_max = max_words * 2;
char **new = mymalloc(new_max * sizeof(char *), M_STRING);
int i;
for (i = 0; i < max_words; i++)
new[i] = words[i];
myfree(words, M_STRING);
words = new;
max_words = new_max;
}
words[*nwords] = ptr;
while (*input != '\0' && (in_quotes || *input != ' ')) {
char c = *(input++);
if (c == '"')
in_quotes = !in_quotes;
else if (c == '\\') {
if (*input != '\0')
*(ptr++) = *(input++);
} else
*(ptr++) = c;
}
while (*input == ' ')
input++;
*(ptr++) = '\0';
}
return words;
}
static char *
build_string(int argc, char *argv[])
{
int i, len = 0;
char *str;
if (!argc)
return str_dup("");
len = strlen(argv[0]);
for (i = 1; i < argc; i++)
len += 1 + strlen(argv[i]);
str = (char *) mymalloc(len + 1, M_STRING);
strcpy(str, argv[0]);
for (i = 1; i < argc; i++) {
strcat(str, " ");
strcat(str, argv[i]);
}
return str;
}
#define MAXWORDS 500 /* maximum number of words in a line */
/* This limit should be removed... */
Var
parse_into_wordlist(const char *command)
{
int argc, i;
char **argv;
Var args;
char *s = str_dup(command);
argv = parse_into_words(s, &argc);
args = new_list(argc);
for (i = 1; i <= argc; i++) {
args.v.list[i].type = TYPE_STR;
args.v.list[i].v.str = str_dup(argv[i - 1]);
}
free_str(s);
return args;
}
Parsed_Command *
parse_command(const char *command, Objid user)
{
static Parsed_Command pc;
const char *argstr;
char *buf;
const char *verb;
int argc;
char **argv;
int pstart, pend, dlen;
int i;
while (*command == ' ')
command++;
switch (*command) {
case '"':
verb = "say";
goto finish_specials;
case ':':
verb = "emote";
goto finish_specials;
case ';':
verb = "eval";
goto finish_specials;
finish_specials:
argstr = command + 1;
buf = (char *) mymalloc(strlen(argstr) + strlen(verb) + 2,
M_STRING);
strcpy(buf, verb);
strcat(buf, " ");
strcat(buf, argstr);
break;
default:
buf = str_dup(command);
{ /* Skip past even complexly-quoted verbs */
int in_quotes = 0;
argstr = command;
while (*argstr && (in_quotes || *argstr != ' ')) {
char c = *(argstr++);
if (c == '"')
in_quotes = !in_quotes;
else if (c == '\\' && *argstr)
argstr++;
}
}
while (*argstr == ' ')
argstr++;
break;
}
argv = parse_into_words(buf, &argc);
if (argc == 0) {
free_str(buf);
return 0;
}
pc.verb = str_dup(argv[0]);
pc.argstr = str_dup(argstr);
pc.args = new_list(argc - 1);
for (i = 1; i < argc; i++) {
pc.args.v.list[i].type = TYPE_STR;
pc.args.v.list[i].v.str = str_dup(argv[i]);
}
/*
* look for a preposition
*/
if (argc > 1) {
pc.prep = db_find_prep(argc - 1, argv + 1, &pstart, &pend);
if (pc.prep == PREP_NONE) {
pstart = argc;
pend = argc;
} else {
pstart++;
pend++;
}
} else {
pc.prep = PREP_NONE;
pstart = argc;
pend = argc;
}
/*
* if there's a preposition,
* find the iobj & dobj around it, if any
*/
if (pc.prep != PREP_NONE) {
pc.prepstr = build_string(pend - pstart + 1, argv + pstart);
pc.iobjstr = build_string(argc - (pend + 1), argv + (pend + 1));
pc.iobj = match_object(user, pc.iobjstr);
} else {
pc.prepstr = str_dup("");
pc.iobjstr = str_dup("");
pc.iobj = NOTHING;
}
dlen = pstart - 1;
if (dlen == 0) {
pc.dobjstr = str_dup("");
pc.dobj = NOTHING;
} else {
pc.dobjstr = build_string(dlen, argv + 1);
pc.dobj = match_object(user, pc.dobjstr);
}
free_str(buf);
return &pc;
}
void
free_parsed_command(Parsed_Command *pc)
{
free_str(pc->verb);
free_str(pc->argstr);
free_var(pc->args);
free_str(pc->dobjstr);
free_str(pc->prepstr);
free_str(pc->iobjstr);
}
char rcsid_parse_cmd[] = "$Id: parse_cmd.c,v 2.2 1996/02/08 06:55:06 pavel Exp $";
/* $Log: parse_cmd.c,v $
* Revision 2.2 1996/02/08 06:55:06 pavel
* Updated copyright notice for 1996. Release 1.8.0beta1.
*
* Revision 2.1 1995/12/28 00:40:37 pavel
* Fixed memory leak in freeing Parsed_Command structures.
* Release 1.8.0alpha3.
*
* Revision 2.0 1995/11/30 04:29:31 pavel
* New baseline version, corresponding to release 1.8.0alpha1.
*
* Revision 1.10 1992/10/23 23:03:47 pavel
* Added copyright notice.
*
* Revision 1.9 1992/10/21 03:02:35 pavel
* Converted to use new automatic configuration system.
*
* Revision 1.8 1992/10/17 20:49:22 pavel
* Global rename of strdup->str_dup, strref->str_ref, vardup->var_dup, and
* varref->var_ref.
*
* Revision 1.7 1992/09/14 17:30:26 pjames
* Moved db_modification code to db modules.
*
* Revision 1.6 1992/08/31 22:32:16 pjames
* Changed some `char *'s to `const char *' and fixed code accordingly.
*
* Revision 1.5 1992/08/28 16:15:47 pjames
* Changed myfree(*, M_STRING) to free_str(*).
* Changed some strref's to strdup.
*
* Revision 1.4 1992/08/20 23:49:12 pavel
* Moved #define MAXARGS from config.h to here, renamed to MAXWORDS. Also
* changed the file name from `parse_command.c' to `parse_cmd.c', to make it
* easier to use on 14-character-file-name systems.
*
* Revision 1.3 1992/08/10 17:35:34 pjames
* Added find_verb() which doesn't fill in a Parse_Info, just returns
* information about the verb.
*
* Revision 1.2 1992/07/21 00:04:53 pavel
* Added rcsid_<filename-root> declaration to hold the RCS ident. string.
*
* Revision 1.1 1992/07/20 23:23:12 pavel
* Initial RCS-controlled version.
*/