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/* This file is part of indexlib.
* Copyright (C) 2005 Luís Pedro Coelho <[email protected]>
*
* Indexlib 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 and available as file
* GPL_V2 which is distributed along with indexlib.
*
* Indexlib 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., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of this program with any edition of
* the Qt library by Trolltech AS, Norway (or with modified versions
* of Qt that use the same license as Qt), and distribute linked
* combinations including the two. You must obey the GNU General
* Public License in all respects for all of the code used other than
* Qt. If you modify this file, you may extend this exception to
* your version of the file, but you are not obligated to do so. If
* you do not wish to do so, delete this exception statement from
* your version.
*/
#include "match.h"
#include "format.h"
#include "compat.h"
#include <iostream>
#include <assert.h>
namespace {
inline
void setbit( unsigned& u, unsigned idx ) {
u |= ( 1 << idx );
}
inline
bool getbit( unsigned u, unsigned idx ) {
return u & ( 1 << idx );
}
}
indexlib::Match::Match( std::string str, unsigned flags ):
masks_( 256 ),
caseinsensitive_( flags & caseinsensitive ),
pattern_rest_( str, kMin( str.size(), sizeof( unsigned ) * 8 - 1 ) )
{
hot_bit_ = kMin( str.size(), sizeof( unsigned ) * 8 - 1 );
for ( unsigned i = 0; i != hot_bit_; ++i ) {
if ( caseinsensitive_ ) {
setbit( masks_[ ( unsigned char )std::toupper( str[ i ] ) ], i );
setbit( masks_[ ( unsigned char )std::tolower( str[ i ] ) ], i );
} else {
setbit( masks_[ ( unsigned char )str[ i ] ], i );
}
}
}
indexlib::Match::~Match() {
}
bool indexlib::Match::process( const char* string ) const {
unsigned state = 0;
while ( *string ) {
state |= 1;
state &= masks_[ ( unsigned char )*string ];
state <<= 1;
++string;
if ( getbit( state, hot_bit_ ) && ( pattern_rest_ == std::string( string, pattern_rest_.size() ) ) ) return true;
}
return !hot_bit_;
}
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