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/* $NetBSD: parse.c,v 1.18 2021/05/02 12:50:43 rillig Exp $ */
/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)parse.c 8.2 (Berkeley) 4/28/95";
#else
__RCSID("$NetBSD: parse.c,v 1.18 2021/05/02 12:50:43 rillig Exp $");
#endif
#endif /* not lint */
#include "extern.h"
#define HASHSIZE 256
#define HASHMUL 81
#define HASHMASK (HASHSIZE - 1)
static int hash(const char *);
static void install(struct wlist *);
static struct wlist *lookup(const char *);
static struct wlist *hashtab[HASHSIZE];
void
wordinit(void)
{
struct wlist *w;
for (w = wlist; w->string; w++)
install(w);
}
static int
hash(const char *s)
{
int hashval = 0;
while (*s) {
hashval += *s++;
hashval *= HASHMUL;
hashval &= HASHMASK;
}
return hashval;
}
static struct wlist *
lookup(const char *s)
{
struct wlist *wp;
for (wp = hashtab[hash(s)]; wp != NULL; wp = wp->next)
if (*s == *wp->string && strcmp(s, wp->string) == 0)
return wp;
return NULL;
}
static void
install(struct wlist *wp)
{
int hashval;
if (lookup(wp->string) == NULL) {
hashval = hash(wp->string);
wp->next = hashtab[hashval];
hashtab[hashval] = wp;
} else
printf("Multiply defined %s.\n", wp->string);
}
void
parse(void)
{
struct wlist *wp;
int n;
int flag;
wordnumber = 0; /* for cypher */
for (n = 0; n <= wordcount; n++) {
if ((wp = lookup(words[n])) == NULL) {
wordvalue[n] = -1;
wordtype[n] = -1;
} else {
wordvalue[n] = wp->value;
wordtype[n] = wp->article;
}
}
/* We never use adjectives for anything, so yank them all. */
for (n = 1; n < wordcount; n++)
if (wordtype[n] == ADJS) {
int i;
for (i = n + 1; i < wordcount; i++) {
wordtype[i - 1] = wordtype[i];
wordvalue[i - 1] = wordvalue[i];
strlcpy(words[i - 1], words[i], WORDLEN);
}
wordcount--;
}
/* Don't let a comma mean AND if followed by a verb. */
for (n = 0; n < wordcount; n++)
if (wordvalue[n] == AND && words[n][0] == ','
&& wordtype[n + 1] == VERB) {
wordvalue[n] = -1;
wordtype[n] = -1;
}
/* Trim "AND AND" which can happen naturally at the end of a
* comma-delimited list.
*/
for (n = 1; n < wordcount; n++)
if (wordvalue[n - 1] == AND && wordvalue[n] == AND) {
int i;
for (i = n + 1; i < wordcount; i++) {
wordtype[i - 1] = wordtype[i];
wordvalue[i - 1] = wordvalue[i];
strlcpy(words[i - 1], words[i], WORDLEN);
}
wordcount--;
}
/* If there is a sequence (NOUN | OBJECT) AND EVERYTHING
* then move all the EVERYTHINGs to the beginning, since that's where
* they're expected. We can't get rid of the NOUNs and OBJECTs in
* case they aren't in EVERYTHING (i.e. not here or nonexistent).
*/
flag = 1;
while (flag) {
flag = 0;
for (n = 1; n < wordcount; n++)
if ((wordtype[n - 1] == NOUNS ||
wordtype[n - 1] == OBJECT) &&
wordvalue[n] == AND &&
wordvalue[n + 1] == EVERYTHING) {
char tmpword[WORDLEN];
wordvalue[n + 1] = wordvalue[n - 1];
wordvalue[n - 1] = EVERYTHING;
wordtype[n + 1] = wordtype[n - 1];
wordtype[n - 1] = OBJECT;
strcpy(tmpword, words[n - 1]);
strlcpy(words[n - 1], words[n + 1], WORDLEN);
strcpy(words[n + 1], tmpword);
flag = 1;
}
/* And trim EVERYTHING AND EVERYTHING. */
for (n = 1; n < wordcount; n++)
if (wordvalue[n - 1] == EVERYTHING &&
wordvalue[n] == AND &&
wordvalue[n + 1] == EVERYTHING) {
int i;
for (i = n + 1; i < wordcount; i++) {
wordtype[i - 1] = wordtype[i + 1];
wordvalue[i - 1] = wordvalue[i + 1];
strlcpy(words[i - 1], words[i + 1], WORDLEN);
}
wordcount--;
wordcount--;
flag = 1;
}
}
}
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