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diff --git a/include/filter_reader.h b/include/filter_reader.h
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+
+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright (C) 2007-2010 SoftPLC Corporation, Dick Hollenbeck <dick@softplc.com>
+ * Copyright (C) 2007 KiCad Developers, see change_log.txt for contributors.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program 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, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#ifndef FILTER_READER_H_
+#define FILTER_READER_H_
+
+#include <wx/wx.h>
+#include <richio.h>
+
+
+/**
+ * Class FILTER_READER
+ * reads lines of text from another LINE_READER, but only returns non-comment
+ * lines and non-blank lines from its ReadLine() function.
+ */
+class FILTER_READER : public LINE_READER
+{
+    LINE_READER&  reader;
+
+public:
+
+    /**
+     * Constructor ( LINE_READER& )
+     * does not take ownership over @a aReader, so will not destroy it.
+     */
+    FILTER_READER( LINE_READER& aReader );
+
+    ~FILTER_READER();
+
+    char* ReadLine() throw( IO_ERROR );
+
+    const wxString& GetSource() const
+    {
+        return reader.GetSource();
+    }
+
+    unsigned LineNumber() const
+    {
+        return reader.LineNumber();
+    }
+};
+
+
+/**
+ * Class WHITESPACE_FILTER_READER
+ * reads lines of text from another LINE_READER, but only returns non-comment
+ * lines and non-blank lines with leading whitespace characters (space and tab)
+ * removed from its ReadLine() function.
+ */
+class WHITESPACE_FILTER_READER : public LINE_READER
+{
+    LINE_READER&  reader;
+
+public:
+
+    /**
+     * Constructor ( LINE_READER& )
+     * does not take ownership over @a aReader, so will not destroy it.
+     */
+    WHITESPACE_FILTER_READER( LINE_READER& aReader );
+
+    ~WHITESPACE_FILTER_READER();
+
+    char* ReadLine() throw( IO_ERROR );
+
+    const wxString& GetSource() const
+    {
+        return reader.GetSource();
+    }
+
+    unsigned LineNumber() const
+    {
+        return reader.LineNumber();
+    }
+};
+
+#endif // FILTER_READER_H_