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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2005 by Michiel van der Kolk
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "searchengine.h"
#include "token.h"
#include "dbinterface.h"
#include "parser.h"
struct token *tokenbuffer,*currentToken;
int currentindex;
int syntaxerror;
char errormsg[250];
unsigned char *parse(struct token *tokenbuf) {
unsigned char *ret=0;
currentindex=0;
syntaxerror=0;
tokenbuffer=tokenbuf;
database_init();
currentToken=&tokenbuffer[currentindex];
PUTS("parse");
ret=parseMExpr();
if(syntaxerror) {
PUTS("Syntaxerror");
rb->splash(HZ*3,true,errormsg);
}
parser_accept(TOKEN_EOF);
return ret;
}
void parser_acceptIt(void) {
if(syntaxerror) return;
currentToken=&tokenbuffer[++currentindex];
}
int parser_accept(unsigned char kind) {
if(currentToken->kind!=kind) {
syntaxerror=1;
rb->snprintf(errormsg,250,"'%d' found where '%d' expected\n",currentToken->kind,kind);
return 0;
}
else {
parser_acceptIt();
return 1;
}
}
unsigned char *parseCompareNum() {
struct token *number1,*number2;
unsigned char *ret;
int i,n1=-1,n2=-1;
int op;
if(syntaxerror) return 0;
PUTS("parseCompareNum");
if(currentToken->kind==TOKEN_NUM ||
currentToken->kind==TOKEN_NUMIDENTIFIER) {
number1=currentToken;
parser_acceptIt();
}
else {
syntaxerror=1;
rb->snprintf(errormsg,250,"'%d' found where NUM/NUMID expected\n",currentToken->kind);
return 0;
}
if(currentToken->kind>=TOKEN_GT && currentToken->kind <= TOKEN_NE) {
op=currentToken->kind;
parser_acceptIt();
}
else {
syntaxerror=1;
rb->snprintf(errormsg,250,"'%d' found where NUMOP expected\n",currentToken->kind);
return 0;
}
if(currentToken->kind==TOKEN_NUM ||
currentToken->kind==TOKEN_NUMIDENTIFIER) {
number2=currentToken;
parser_acceptIt();
}
else {
syntaxerror=1;
rb->snprintf(errormsg,250,"'%d' found where NUM/NUMID expected\n",currentToken->kind);
return 0;
}
ret=my_malloc(sizeof(unsigned char)*rb->tagdbheader->filecount);
if(number1->kind==TOKEN_NUM)
n1=getvalue(number1);
if(number2->kind==TOKEN_NUM)
n2=getvalue(number2);
for(i=0;i<rb->tagdbheader->filecount;i++) {
loadentry(i);
if(number1->kind==TOKEN_NUMIDENTIFIER)
n1=getvalue(number1);
if(number2->kind==TOKEN_NUMIDENTIFIER)
n2=getvalue(number2);
switch(op) {
case TOKEN_GT:
ret[i]=n1 > n2;
break;
case TOKEN_GTE:
ret[i]=n1 >= n2;
break;
case TOKEN_LT:
ret[i]=n1 < n2;
break;
case TOKEN_LTE:
ret[i]=n1 <= n2;
break;
case TOKEN_EQ:
ret[i]=n1 == n2;
break;
case TOKEN_NE:
ret[i]=n1 != n2;
break;
}
}
return ret;
}
unsigned char *parseCompareString() {
struct token *string1,*string2;
unsigned char *ret;
char *s1=NULL,*s2=NULL;
int i,contains;
if(syntaxerror) return 0;
PUTS("parseCompareString");
if(currentToken->kind==TOKEN_STRING ||
currentToken->kind==TOKEN_STRINGIDENTIFIER) {
string1=currentToken;
parser_acceptIt();
}
else {
syntaxerror=1;
rb->snprintf(errormsg,250,"'%d' found where STRING/STRINGID expected\n",currentToken->kind);
return 0;
}
contains=currentToken->kind==TOKEN_CONTAINS;
if(currentToken->kind==TOKEN_CONTAINS ||
currentToken->kind==TOKEN_EQUALS)
parser_acceptIt();
else {
syntaxerror=1;
rb->snprintf(errormsg,250,"'%d' found where CONTAINS/EQUALS expected\n",currentToken->kind);
return 0;
}
if(currentToken->kind==TOKEN_STRING ||
currentToken->kind==TOKEN_STRINGIDENTIFIER) {
string2=currentToken;
parser_acceptIt();
}
else {
syntaxerror=1;
rb->snprintf(errormsg,250,"'%d' found where STRING/STRINGID expected\n",currentToken->kind);
return 0;
}
ret=my_malloc(sizeof(unsigned char)*rb->tagdbheader->filecount);
if(string1->kind==TOKEN_STRING)
s1=getstring(string1);
if(string2->kind==TOKEN_STRING)
s2=getstring(string2);
for(i=0;i<rb->tagdbheader->filecount;i++) {
loadentry(i);
if(string1->kind==TOKEN_STRINGIDENTIFIER)
s1=getstring(string1);
if(string2->kind==TOKEN_STRINGIDENTIFIER)
s2=getstring(string2);
if(contains)
ret[i]=rb->strcasestr(s1,s2)!=0;
else
ret[i]=rb->strcasecmp(s1,s2)==0;
}
return ret;
}
unsigned char *parseExpr() {
unsigned char *ret;
int i;
if(syntaxerror) return 0;
PUTS("parseExpr");
switch(currentToken->kind) {
case TOKEN_NOT:
parser_accept(TOKEN_NOT);
PUTS("parseNot");
ret = parseExpr();
if(ret==NULL) return 0;
for(i=0;i<rb->tagdbheader->filecount;i++)
ret[i]=!ret[i];
break;
case TOKEN_LPAREN:
parser_accept(TOKEN_LPAREN);
ret = parseMExpr();
if(ret==NULL) return 0;
parser_accept(TOKEN_RPAREN);
break;
case TOKEN_NUM:
case TOKEN_NUMIDENTIFIER:
ret = parseCompareNum();
if(ret==NULL) return 0;
break;
case TOKEN_STRING:
case TOKEN_STRINGIDENTIFIER:
ret = parseCompareString();
if(ret==NULL) return 0;
break;
default:
// error, unexpected symbol
syntaxerror=1;
rb->snprintf(errormsg,250,"unexpected '%d' found at parseExpr\n",currentToken->kind);
ret=0;
break;
}
return ret;
}
unsigned char *parseMExpr() {
unsigned char *ret,*ret2;
int i;
if(syntaxerror) return 0;
PUTS("parseMExpr");
ret=parseExpr();
while(currentToken->kind==TOKEN_AND||currentToken->kind==TOKEN_OR) {
switch(currentToken->kind) {
case TOKEN_AND:
parser_accept(TOKEN_AND);
PUTS("parseAnd");
ret2 = parseExpr();
if(ret2==NULL) return 0;
for(i=0;i<rb->tagdbheader->filecount;i++)
ret[i]=ret[i] && ret2[i];
break;
case TOKEN_OR:
parser_accept(TOKEN_OR);
PUTS("parseOr");
ret2 = parseExpr();
if(ret2==NULL) return 0;
for(i=0;i<rb->tagdbheader->filecount;i++)
ret[i]=ret[i] || ret2[i];
break;
}
}
return ret;
}
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