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#include "bool_matcher.h"
#include <map>
#include <vector>
#include <algorithm>
using namespace std;
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
struct bool_expr_item
{
size_t item_num;
struct bool_item * items;
};
struct bool_matcher
{
unsigned int bool_expr_num;
struct bool_expr_match * bool_expr_ids;
struct bool_expr_item * bool_expr_items;
unsigned int bool_item_num;
unsigned long long * bool_items;
unsigned int * mapped_ptr;
unsigned int * mapped_ids;
unsigned int bitmap_size;
unsigned char * bitmap;
};
bool operator<(const struct bool_item & lhs, const struct bool_item & rhs)
{
return lhs.item_id<rhs.item_id;
}
struct bool_matcher * bool_matcher_new(struct bool_expr * exprs, size_t expr_num, size_t * mem_size)
{
if(exprs==NULL || expr_num==0) return NULL;
unsigned int mem_bytes=0;
struct bool_matcher * matcher=new struct bool_matcher;
mem_bytes+=sizeof(bool_matcher);
matcher->bool_expr_num=(unsigned int)expr_num;
matcher->bool_expr_ids =new struct bool_expr_match[expr_num];
matcher->bool_expr_items=new struct bool_expr_item[expr_num];
mem_bytes+=(unsigned int)expr_num*(sizeof(struct bool_expr_match)+sizeof(struct bool_expr_item));
for(unsigned int i=0; i<expr_num; i++)
{
matcher->bool_expr_ids[i].expr_id =exprs[i].expr_id;
matcher->bool_expr_ids[i].user_tag =exprs[i].user_tag;
matcher->bool_expr_items[i].item_num=exprs[i].item_num;
matcher->bool_expr_items[i].items=new struct bool_item[exprs[i].item_num];
mem_bytes+=(unsigned int)exprs[i].item_num*sizeof(struct bool_item);
copy(exprs[i].items, exprs[i].items+exprs[i].item_num, matcher->bool_expr_items[i].items);
sort(matcher->bool_expr_items[i].items, matcher->bool_expr_items[i].items+exprs[i].item_num);
}
map<unsigned long long, unsigned int> M1;
for(unsigned int i=0; i<expr_num; i++)
{
for(unsigned int j=0; j<exprs[i].item_num; j++)
{
if(exprs[i].items[j].not_flag==0) M1[exprs[i].items[j].item_id]++;
}
}
map< unsigned long long, vector<unsigned int> > M2;
for(unsigned int i=0; i<expr_num; i++)
{
unsigned int min_count=-1;
unsigned long long item_id;
for(unsigned int j=0; j<exprs[i].item_num; j++)
{
if(exprs[i].items[j].not_flag==0)
{
unsigned int c=M1[exprs[i].items[j].item_id];
if(c<min_count)
{
min_count=c;
item_id=exprs[i].items[j].item_id;
}
}
}
M2[item_id].push_back(i);
}
matcher->bool_item_num=(unsigned int)M2.size();
matcher->bool_items =new unsigned long long[M2.size()];
matcher->mapped_ptr =new unsigned int[M2.size()+1];
matcher->mapped_ids =new unsigned int[matcher->bool_expr_num];
mem_bytes+=((unsigned int)M2.size()+1+matcher->bool_expr_num)*sizeof(unsigned int)+(unsigned int)M2.size()*sizeof(unsigned long long);
matcher->mapped_ptr[0]=0;
map< unsigned long long, vector<unsigned int> >::const_iterator it=M2.begin();
for(unsigned int k=0; k<M2.size(); ++k, ++it)
{
matcher->bool_items[k]=it->first;
copy(it->second.begin(), it->second.end(), matcher->mapped_ids+matcher->mapped_ptr[k]);
matcher->mapped_ptr[k+1]=matcher->mapped_ptr[k]+(unsigned int)it->second.size();
}
M1.clear();
M2.clear();
matcher->bitmap_size=(1U<<27);
matcher->bitmap=new unsigned char[(matcher->bitmap_size)>>3];
mem_bytes+=(matcher->bitmap_size)>>3;
memset(matcher->bitmap, 0, (matcher->bitmap_size)>>3);
for(unsigned int i=0; i<matcher->bool_item_num; i++)
{
unsigned int j=matcher->bool_items[i]&(matcher->bitmap_size-1);
matcher->bitmap[j>>3]|=(1U<<(j&7));
}
if(mem_size!=NULL) *mem_size=mem_bytes;
return matcher;
}
int res_comp(const void * lhs, const void * rhs)
{
bool_expr_match * _lhs=(bool_expr_match *)lhs;
bool_expr_match * _rhs=(bool_expr_match *)rhs;
return (_lhs->expr_id<_rhs->expr_id) ? 1 : -1;
}
int do_match(struct bool_expr_item * expr, unsigned long long * item_ids, size_t item_num)
{
unsigned int i=0;
for(unsigned int j=0; j<expr->item_num; ++j)
{
if(expr->items[j].not_flag==0)
{
while(i<item_num && item_ids[i]<expr->items[j].item_id) ++i;
if(i==item_num || item_ids[i]>expr->items[j].item_id) return 0;
++i;
}
else
{
while(i<item_num && item_ids[i]<expr->items[j].item_id) ++i;
if(i<item_num && item_ids[i]==expr->items[j].item_id) return 0;
}
}
return 1;
}
int bool_matcher_match(struct bool_matcher * matcher, unsigned long long * item_ids, size_t item_num, struct bool_expr_match * results, size_t n_result)
{
if(matcher==NULL) return -1;
if(item_num==0) return 0;
// sort(item_ids, item_ids+item_num);
// size_t J=0;
// for(unsigned int i=1; i<item_num; i++)
// {
// if(item_ids[i]!=item_ids[J]) item_ids[++J]=item_ids[i];
// }
// item_num=J+1;
unsigned int r=0;
for(unsigned int i=0; i<item_num; i++)
{
unsigned int t=item_ids[i]&(matcher->bitmap_size-1);
if((matcher->bitmap[t>>3]&(1U<<(t&7)))==0) continue;
int l=0, h=(int)matcher->bool_item_num-1;
while(l<=h)
{
int m=(l+h)/2;
if(item_ids[i]==matcher->bool_items[m])
{
for(unsigned int j=matcher->mapped_ptr[m]; j<matcher->mapped_ptr[m+1]; j++)
{
unsigned int idx=matcher->mapped_ids[j];
int ret=do_match(matcher->bool_expr_items+idx, item_ids, item_num);
if(ret==1)
{
if(r==n_result) goto END;
results[r++]=matcher->bool_expr_ids[idx];
}
}
break;
}
else if(item_ids[i]<matcher->bool_items[m])
{
h=m-1;
}
else
{
l=m+1;
}
}
}
END:
qsort(results, r, sizeof(bool_expr_match), res_comp);
return r;
}
void bool_matcher_free(struct bool_matcher * matcher)
{
if(matcher==NULL) return;
delete [] matcher->bool_expr_ids;
for(unsigned int i=0; i<matcher->bool_expr_num; i++) delete [] matcher->bool_expr_items[i].items;
delete [] matcher->bool_expr_items;
delete [] matcher->bool_items;
delete [] matcher->mapped_ptr;
delete [] matcher->mapped_ids;
delete [] matcher->bitmap;
delete matcher;
return;
}
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