parse.c revision 1.9
1/* $NetBSD: parse.c,v 1.9 2000/09/22 08:19:21 jsm Exp $ */ 2 3/* 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36#include <sys/cdefs.h> 37#ifndef lint 38#if 0 39static char sccsid[] = "@(#)parse.c 8.2 (Berkeley) 4/28/95"; 40#else 41__RCSID("$NetBSD: parse.c,v 1.9 2000/09/22 08:19:21 jsm Exp $"); 42#endif 43#endif /* not lint */ 44 45#include "extern.h" 46 47void 48wordinit() 49{ 50 struct wlist *w; 51 52 for (w = wlist; w->string; w++) 53 install(w); 54} 55 56int 57hash(s) 58 const char *s; 59{ 60 int hashval = 0; 61 62 while (*s) { 63 hashval += *s++; 64 hashval *= HASHMUL; 65 hashval &= HASHMASK; 66 } 67 return hashval; 68} 69 70struct wlist * 71lookup(s) 72 const char *s; 73{ 74 struct wlist *wp; 75 76 for (wp = hashtab[hash(s)]; wp != NULL; wp = wp->next) 77 if (*s == *wp->string && strcmp(s, wp->string) == 0) 78 return wp; 79 return NULL; 80} 81 82void 83install(wp) 84 struct wlist *wp; 85{ 86 int hashval; 87 88 if (lookup(wp->string) == NULL) { 89 hashval = hash(wp->string); 90 wp->next = hashtab[hashval]; 91 hashtab[hashval] = wp; 92 } else 93 printf("Multiply defined %s.\n", wp->string); 94} 95 96void 97parse() 98{ 99 struct wlist *wp; 100 int n; 101 int flag; 102 103 wordnumber = 0; /* for cypher */ 104 for (n = 0; n <= wordcount; n++) { 105 if ((wp = lookup(words[n])) == NULL) { 106 wordvalue[n] = -1; 107 wordtype[n] = -1; 108 } else { 109 wordvalue[n] = wp->value; 110 wordtype[n] = wp->article; 111 } 112 } 113 /* We never use adjectives for anything, so yank them all. */ 114 for (n = 1; n < wordcount; n++) 115 if (wordtype[n] == ADJS) { 116 int i; 117 for (i = n + 1; i < wordcount; i++) { 118 wordtype[i - 1] = wordtype[i]; 119 wordvalue[i - 1] = wordvalue[i]; 120 strcpy(words[i - 1], words[i]); 121 } 122 wordcount--; 123 } 124 /* Don't let a comma mean AND if followed by a verb. */ 125 for (n = 0; n < wordcount; n++) 126 if (wordvalue[n] == AND && words[n][0] == ',' 127 && wordtype[n + 1] == VERB) { 128 wordvalue[n] = -1; 129 wordtype[n] = -1; 130 } 131 /* Trim "AND AND" which can happen naturally at the end of a 132 * comma-delimited list. 133 */ 134 for (n = 1; n < wordcount; n++) 135 if (wordvalue[n - 1] == AND && wordvalue[n] == AND) { 136 int i; 137 for (i = n + 1; i < wordcount; i++) { 138 wordtype[i - 1] = wordtype[i]; 139 wordvalue[i - 1] = wordvalue[i]; 140 strcpy(words[i - 1], words[i]); 141 } 142 wordcount--; 143 } 144 145 /* If there is a sequence (NOUN | OBJECT) AND EVERYTHING 146 * then move all the EVERYTHINGs to the beginning, since that's where 147 * they're expected. We can't get rid of the NOUNs and OBJECTs in 148 * case they aren't in EVERYTHING (i.e. not here or nonexistant). 149 */ 150 flag = 1; 151 while (flag) { 152 flag = 0; 153 for (n = 1; n < wordcount; n++) 154 if ((wordtype[n - 1] == NOUNS || wordtype[n - 1] == OBJECT) && 155 wordvalue[n] == AND && wordvalue[n + 1] == EVERYTHING) { 156 char tmpword[WORDLEN]; 157 wordvalue[n + 1] = wordvalue[n - 1]; 158 wordvalue[n - 1] = EVERYTHING; 159 wordtype[n + 1] = wordtype[n - 1]; 160 wordtype[n - 1] = OBJECT; 161 strcpy(tmpword, words[n - 1]); 162 strcpy(words[n - 1], words[n + 1]); 163 strcpy(words[n + 1], tmpword); 164 flag = 1; 165 } 166 /* And trim EVERYTHING AND EVERYTHING. */ 167 for (n = 1; n < wordcount; n++) 168 if (wordvalue[n - 1] == EVERYTHING && 169 wordvalue[n] == AND && wordvalue[n + 1] == EVERYTHING) { 170 int i; 171 for (i = n + 1; i < wordcount; i++) { 172 wordtype[i - 1] = wordtype[i + 1]; 173 wordvalue[i - 1] = wordvalue[i + 1]; 174 strcpy(words[i - 1], words[i + 1]); 175 } 176 wordcount--; 177 wordcount--; 178 flag = 1; 179 } 180 } 181} 182