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/*****************************************************************************
** FILE IDENTIFICATION
**
** Hash Table Class
**
** This is part of the CTSim program
** Copyright (c) 1983-2001 Kevin Rosenberg
**
** $Id: hashtable.cpp 7061 2003-09-07 06:34:45Z kevin $
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License (version 2) as
** published by the Free Software Foundation.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
******************************************************************************/
#include "ct.h"
#include <math.h>
#include <stdio.h>
#include <ctype.h>
#include "ctsupport.h"
#include "pol.h"
KeywordCodeEntry::KeywordCodeEntry (const char* const pszKeyword, int iCode)
: m_iCode (iCode), m_pNext(NULL)
{
int nLength = strlen (pszKeyword);
char* pszCopy = new char [ nLength + 1];
for (int i = 0; i < nLength; i++)
pszCopy[i] = tolower (pszKeyword[i]);
pszCopy[nLength] = 0;
m_strKeyword = pszCopy;
delete pszCopy;
}
bool
KeywordCodeEntry::matchesKeyword (const char* const pszCompare) const
{
int nLength = strlen (pszCompare);
char* pszCopy = new char [ nLength + 1];
for (int i = 0; i < nLength; i++)
pszCopy[i] = tolower (pszCompare[i]);
pszCopy[nLength] = 0;
bool bMatch = false;
if (m_strKeyword.compare (pszCompare) == 0)
bMatch = true;
delete pszCopy;
return bMatch;
}
// inittable (table)
// clear symbol table
void
KeywordCodeHashTable::initTable ()
{
int i;
for (i = 0; i < HASHSIZE; i++)
m_hashTable[i] = NULL;
}
// freetable (table)
// free all memory allocated to table, then clear table
void
KeywordCodeHashTable::freeTable ()
{
int i;
KeywordCodeEntry *p, *np;
for (i = 0; i < HASHSIZE; i++) {
np = m_hashTable [i];
while (np != NULL) {
p = np->getNext();
delete np;
np = p;
}
}
initTable ();
}
// form hash value of string s
int
KeywordCodeHashTable::hash (const char* s)
{
int hashval = 0;
while (*s != EOS) {
hashval += tolower(*s);
s++;
}
return (hashval % HASHSIZE);
}
/* Look for s in hash table */
KeywordCodeEntry *
KeywordCodeHashTable::lookup (const char* const pszLookup)
{
KeywordCodeEntry *found = NULL;
for (KeywordCodeEntry* np = m_hashTable[ hash( pszLookup ) ]; np != NULL; np = np->getNext())
if (np->matchesKeyword (pszLookup)) {
found = np; // found it
break;
}
return (found);
}
void
KeywordCodeHashTable::installKeywordCode (const char* const pszKeyword, int iCode)
{
KeywordCodeEntry *np = lookup (pszKeyword);
if (np == NULL) { // not found
np = new KeywordCodeEntry (pszKeyword, iCode);
int hashval = hash (np->getKeyword());
np->setNext (m_hashTable[ hashval ]);
m_hashTable[hashval] = np;
} else // already defined
np->setCode (iCode);
}
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