/*

* RFCPageFoldHandler.java

* :tabSize=8:indentSize=8:noTabs=false:

* :folding=explicit:collapseFolds=1:

*

* Copyright (C) 2007 Matthieu Casanova

*

* 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 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, write to the Free Software

* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/

package gatchan.jedit.rfcreader;



import org.gjt.sp.jedit.buffer.FoldHandler;

import org.gjt.sp.jedit.buffer.JEditBuffer;



import javax.swing.text.Segment;



/**

* @author Matthieu Casanova

* @version $Id: Server.java,v 1.33 2007/01/05 15:15:17 matthieu Exp $

*/

public class RFCPageFoldHandler extends FoldHandler

{

	//{{{ RFCPageFoldHandler constructor

	public RFCPageFoldHandler()

	{

		super("rfc-page");

	} //}}}

	

	//{{{ getFoldLevel() method

	public int getFoldLevel(JEditBuffer buffer, int lineIndex, Segment seg)

	{

		if(lineIndex == 0)

			return 0;

		

		int foldLevel = buffer.getFoldLevel(lineIndex - 1);

		buffer.getLineText(lineIndex - 1,seg);

		if (segmentIsPage(seg))

		{

			return foldLevel + 1;

		}

		else if (seg.count == 0)

		{

			buffer.getLineText(lineIndex,seg);

			if (segmentIsPage(seg))

			{

				return Math.max(foldLevel - 1,0);

			}

		}

		return foldLevel;

	} //}}}

	

	//{{{ segmentIsPage() method

	private boolean segmentIsPage(Segment seg)

	{

		int offset = seg.offset;

		int count = seg.count;

		if (count < 8)

			return false;

		

		char[] chars = seg.array;

		if (chars[offset + count - 1] != ']')

			return false;

		

		int i;

		for (i = count - 2;i>0;i--)

		{

			char c = chars[offset + i];

			if (Character.isWhitespace(c))

			{

				i--;

				break;

			}

			

			if (!Character.isDigit(c))

				return false;

		}

		if (i < 5)

			return false;

		

		if (chars[offset + i] == 'e' &&

		    chars[offset + i-1] == 'g' &&

		    chars[offset + i-2] == 'a' &&

		    chars[offset + i-3] == 'P' &&

		    chars[offset + i-4] == '[')

		{

			return true;

		}

		return false;

	} //}}}

}