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diff --git a/tdespell2/filter.h b/tdespell2/filter.h
new file mode 100644
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+++ b/tdespell2/filter.h
@@ -0,0 +1,122 @@
+// -*- Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil; -*-
+/*
+ * filter.h
+ *
+ * Copyright (C)  2004  Zack Rusin <zack@kde.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301  USA
+ */
+
+#ifndef KSPELL_FILTER_H
+#define KSPELL_FILTER_H
+
+#include <tqstring.h>
+#include <tdelibs_export.h>
+
+namespace KSpell2
+{
+    class Settings;
+
+    /**
+     * Structure abstracts the word and its position in the
+     * parent text.
+     *
+     * @author Zack Rusin <zack@kde.org>
+     * @short struct represents word
+     */
+    struct Word
+    {
+        Word() : start( 0 ), end( true )
+            {}
+
+        Word( const TQString& w, int st, bool e = false )
+            : word( w ), start( st ), end( e )
+            {}
+        Word( const Word& other )
+            : word( other.word ), start( other.start ),
+              end( other.end )
+            {}
+
+        TQString word;
+        uint    start;
+        bool    end;
+    };
+
+    /**
+     * Filter is used to split text into words which
+     * will be spell checked.
+     *
+     * @author Zack Rusin <zack@kde.org>
+     * @short used to split text into words
+     */
+    class KDE_EXPORT Filter
+    {
+    public:
+        static Filter *defaultFilter();
+    public:
+        Filter();
+        virtual ~Filter();
+
+        static Word end();
+
+        /**
+         * Sets the Settings object for this Filter
+         */
+        void setSettings( Settings* );
+
+        /**
+         * Returns currently used Settings object
+         */
+        Settings *settings() const;
+
+        bool atEnd() const;
+
+        void setBuffer( const TQString& buffer );
+        TQString buffer() const;
+
+        void restart();
+
+        virtual Word nextWord() const;
+        virtual Word previousWord() const;
+        virtual Word wordAtPosition( unsigned int pos ) const;
+
+        virtual void setCurrentPosition( int );
+        virtual int currentPosition() const;
+        virtual void replace( const Word& w, const TQString& newWord );
+
+        /**
+         * Should return the sentence containing the current word
+         */
+        virtual TQString context() const;
+    protected:
+        bool trySkipLinks() const;
+        bool ignore( const TQString& word ) const;
+        TQChar skipToLetter( uint &fromPosition ) const;
+        bool shouldBeSkipped( bool wordWasUppercase, bool wordWasRunTogether,
+                              const TQString& foundWord ) const;
+
+    protected:
+        TQString      m_buffer;
+        mutable uint m_currentPosition;
+
+    private:
+        class Private;
+        Private *d;
+    };
+
+}
+
+#endif