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authortoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
committertoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
commit460c52653ab0dcca6f19a4f492ed2c5e4e963ab0 (patch)
tree67208f7c145782a7e90b123b982ca78d88cc2c87 /indexlib/match.h
downloadtdepim-460c52653ab0dcca6f19a4f492ed2c5e4e963ab0.tar.gz
tdepim-460c52653ab0dcca6f19a4f492ed2c5e4e963ab0.zip
Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.
BUG:215923 git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdepim@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
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+#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_ */