You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
77 lines
2.8 KiB
77 lines
2.8 KiB
#ifndef LPC_MATCH_H1105564052_INCLUDE_GUARD_
|
|
#define LPC_MATCH_H1105564052_INCLUDE_GUARD_
|
|
|
|
/* This file is part of indexlib.
|
|
* Copyright (C) 2005 Luís Pedro Coelho <luis@luispedro.org>
|
|
*
|
|
* 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 <string>
|
|
#include <vector>
|
|
#include <map>
|
|
|
|
namespace indexlib {
|
|
|
|
/**
|
|
* \brief A class for string matching
|
|
*
|
|
* This class represents a pattern in a pre-processed form so that searching for it in larger textes is
|
|
* very fast. This allows for a very fast way to ask "does this pattern appear in this text?"
|
|
*
|
|
* The implementation uses the shift-or algorithm which is very fast, but especially designed for
|
|
* patterns which are shorter than the number of bits in a word ( 32 bits on most architechtures ). For
|
|
* larger patterns, the first 32 characters are matched using shift-or and the next characters are strcmp()ed.
|
|
* Even for patterns larger than 32 characters, this should be a fast strategy.
|
|
*/
|
|
class Match {
|
|
public:
|
|
enum flags { caseinsensitive = 1 };
|
|
/** Construct an object to match string \param pattern
|
|
*/
|
|
Match( std::string pattern, unsigned flags = 0 );
|
|
~Match();
|
|
|
|
/**
|
|
* Returns true if the pattern appears in \param string
|
|
* It has no memory
|
|
*/
|
|
bool process( const char* string ) const;
|
|
bool process( std::string str ) const { return process( str.c_str() ); }
|
|
private:
|
|
typedef std::vector<unsigned> masks_type;
|
|
masks_type masks_;
|
|
unsigned hot_bit_;
|
|
bool caseinsensitive_;
|
|
std::string pattern_rest_;
|
|
};
|
|
}
|
|
|
|
|
|
#endif /* LPC_MATCH_H1105564052_INCLUDE_GUARD_ */
|