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/jEdit/tags/jedit-4-1-pre5/org/gjt/sp/jedit/buffer/IndentFoldHandler.java

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Java | 90 lines | 42 code | 10 blank | 38 comment | 4 complexity | ca257cab1875a706816a4950d85d0659 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, 2002 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 4092 2002-03-17 01:28:44Z spestov $
32 * @since jEdit 4.0pre1
33 */
34public class IndentFoldHandler extends FoldHandler
35{
36	public IndentFoldHandler()
37	{
38		super("indent");
39	}
40
41	//{{{ getFoldLevel() method
42	/**
43	 * Returns the fold level of the specified line.
44	 * @param buffer The buffer in question
45	 * @param lineIndex The line index
46	 * @param seg A segment the fold handler can use to obtain any
47	 * text from the buffer, if necessary
48	 * @return The fold level of the specified line
49	 * @since jEdit 4.0pre1
50	 */
51	public int getFoldLevel(Buffer buffer, int lineIndex, Segment seg)
52	{
53		int tabSize = buffer.getTabSize();
54
55		buffer.getLineText(lineIndex,seg);
56
57		int offset = seg.offset;
58		int count = seg.count;
59
60		int whitespace = 0;
61
62		boolean seenNonWhiteSpace = false;
63
64loop:		for(int i = 0; i < count; i++)
65		{
66			switch(seg.array[offset + i])
67			{
68			case ' ':
69				whitespace++;
70				break;
71			case '\t':
72				whitespace += (tabSize - whitespace % tabSize);
73				break;
74			default:
75				seenNonWhiteSpace = true;
76				break loop;
77			}
78		}
79
80		if(!seenNonWhiteSpace)
81		{
82			// empty line. inherit previous line's fold level
83			if(lineIndex != 0)
84				return buffer.getFoldLevel(lineIndex - 1);
85			else
86				return 0;
87		}
88			return whitespace;
89	} //}}}
90}