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This should give some optimization when and-ing things....

Browse source 
*hopes he got this right and it won't screw up the search engine*
but thats what cvs is for :)


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6382 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Michiel Van Der Kolk 2005-04-28 21:28:42 +00:00
parent 74875ef37e
commit 388d9ff6a3
2 changed files with 50 additions and 23 deletions
Download patch file Download diff file Expand all files Collapse all files

72
apps/plugins/searchengine/parser.c
View file

@ -22,14 +22,24 @@
#include "parser.h"
struct token *currentToken, curtoken;
unsigned char *filter[20],*nofilter=0;
int currentlevel=0;
int syntaxerror;
int parse_fd;
char errormsg[250];
unsigned char *parse(int fd) {
unsigned char *ret=0;
int i;
syntaxerror=0;
parse_fd=fd;
currentlevel=0;
if(nofilter==0) {
nofilter=my_malloc(sizeof(unsigned char)*rb->tagdbheader->filecount);
rb->memset(nofilter,1,rb->tagdbheader->filecount);
}
for(i=0;i<20;i++)
filter[i]=nofilter;
database_init();
parser_acceptIt();
currentToken=&curtoken;
@ -101,7 +111,8 @@ unsigned char *parseCompareNum() {
n1=getvalue(&number1);
if(number2.kind==TOKEN_NUM)
n2=getvalue(&number2);
for(i=0;i<rb->tagdbheader->filecount;i++) {
for(i=0;i<rb->tagdbheader->filecount;i++)
if(filter[currentlevel][i]) {
loadentry(i);
if(number1.kind==TOKEN_NUMIDENTIFIER)
n1=getvalue(&number1);
@ -182,7 +193,8 @@ unsigned char *parseCompareString() {
s1=getstring(&string1);
if(string2.kind==TOKEN_STRING)
s2=getstring(&string2);
for(i=0;i<rb->tagdbheader->filecount;i++) {
for(i=0;i<rb->tagdbheader->filecount;i++)
if(filter[currentlevel][i]) {
loadentry(i);
if(string1.kind==TOKEN_STRINGIDENTIFIER)
s1=getstring(&string1);
@ -208,11 +220,14 @@ unsigned char *parseExpr() {
ret = parseExpr();
if(ret==NULL) return 0;
for(i=0;i<rb->tagdbheader->filecount;i++)
ret[i]=!ret[i];
if(filter[currentlevel][i])
ret[i]=!ret[i];
break;
case TOKEN_LPAREN:
parser_accept(TOKEN_LPAREN);
currentlevel++;
ret = parseMExpr();
currentlevel--;
if(ret==NULL) return 0;
parser_accept(TOKEN_RPAREN);
break;
@ -241,26 +256,37 @@ unsigned char *parseMExpr() {
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;
}
ret=parseLExpr();
while(currentToken->kind==TOKEN_OR) {
parser_accept(TOKEN_OR);
PUTS("parseOr");
ret2 = parseLExpr();
if(ret2==NULL) return 0;
for(i=0;i<rb->tagdbheader->filecount;i++)
if(filter[currentlevel][i]) // this should always be true
ret[i]=ret[i] || ret2[i];
else
rb->splash(HZ*2,true,"An or is having a filter, bad.");
}
return ret;
}
unsigned char *parseLExpr() {
unsigned char *ret,*ret2;
int i;
if(syntaxerror) return 0;
PUTS("parseLExpr");
filter[currentlevel]=nofilter;
ret=parseExpr();
filter[currentlevel]=ret;
while(currentToken->kind==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];
}
filter[currentlevel]=nofilter;
return ret;
}

1
apps/plugins/searchengine/parser.h
View file

@ -27,3 +27,4 @@ unsigned char *parseCompareNum(void);
unsigned char *parseCompareString(void);
unsigned char *parseExpr(void);
unsigned char *parseMExpr(void);
unsigned char *parseLExpr(void);