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/jEdit/tags/jedit-4-0-pre5/org/gjt/sp/jedit/buffer/IndentFoldHandler.java

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Java | 85 lines | 39 code | 8 blank | 38 comment | 5 complexity | a187583a2f553c70fc904f144d1b8826 MD5 | raw file
 1/*
 2 * IndentFoldHandler.java - Indent-based fold handler
 3 * :tabSize=8:indentSize=8:noTabs=false:
 4 * :folding=explicit:collapseFolds=1:
 5 *
 6 * Copyright (C) 2001 Slava Pestov
 7 *
 8 * This program is free software; you can redistribute it and/or
 9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version 2
11 * of the License, or any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
21 */
22
23package org.gjt.sp.jedit.buffer;
24
25import javax.swing.text.Segment;
26import org.gjt.sp.jedit.Buffer;
27
28/**
29 * A fold handler that folds lines based on their indent level.
30 * @author Slava Pestov
31 * @version $Id: IndentFoldHandler.java 3996 2002-01-26 01:36:25Z spestov $
32 * @since jEdit 4.0pre1
33 */
34public class IndentFoldHandler implements FoldHandler
35{
36	//{{{ getFoldLevel() method
37	/**
38	 * Returns the fold level of the specified line.
39	 * @param buffer The buffer in question
40	 * @param lineIndex The line index
41	 * @param seg A segment the fold handler can use to obtain any
42	 * text from the buffer, if necessary
43	 * @return The fold level of the specified line
44	 * @since jEdit 4.0pre1
45	 */
46	public int getFoldLevel(Buffer buffer, int lineIndex, Segment seg)
47	{
48		int tabSize = buffer.getTabSize();
49
50		buffer.getLineText(lineIndex,seg);
51
52		int offset = seg.offset;
53		int count = seg.count;
54
55		int whitespace = 0;
56
57		if(count == 0)
58		{
59			// empty line. inherit previous line's fold level
60			if(lineIndex != 0)
61				whitespace = buffer.getFoldLevel(lineIndex - 1);
62			else
63				whitespace = 0;
64		}
65		else
66		{
67loop:			for(int i = 0; i < count; i++)
68			{
69				switch(seg.array[offset + i])
70				{
71				case ' ':
72					whitespace++;
73					break;
74				case '\t':
75					whitespace += (tabSize - whitespace % tabSize);
76					break;
77				default:
78					break loop;
79				}
80			}
81		}
82
83		return whitespace;
84	} //}}}
85}