
/*
 * 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_
