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/jEdit/tags/jedit-4-3-pre5/org/gjt/sp/jedit/buffer/ExplicitFoldHandler.java

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Java | 99 lines | 51 code | 8 blank | 40 comment | 8 complexity | c32f1f32da0dd879c5d0beb2be23fb15 MD5 | raw file
 1/*
 2 * ExplicitFoldHandler.java - Explicit 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;
26
27/**
28 * A fold handler that folds lines based on markers ("{{{" and "}}}")
29 * embedded in the text.
30 *
31 * @author Slava Pestov
32 * @version $Id: ExplicitFoldHandler.java 5339 2006-01-25 23:12:07Z spestov $
33 * @since jEdit 4.0pre1
34 */
35public class ExplicitFoldHandler extends FoldHandler
36{
37	//{{{ ExplicitFoldHandler constructor
38	public ExplicitFoldHandler()
39	{
40		super("explicit");
41	} //}}}
42
43	//{{{ getFoldLevel() method
44	/**
45	 * Returns the fold level of the specified line.
46	 * @param buffer The buffer in question
47	 * @param lineIndex The line index
48	 * @param seg A segment the fold handler can use to obtain any
49	 * text from the buffer, if necessary
50	 * @return The fold level of the specified line
51	 * @since jEdit 4.0pre1
52	 */
53	public int getFoldLevel(JEditBuffer buffer, int lineIndex, Segment seg)
54	{
55		if(lineIndex == 0)
56			return 0;
57		else
58		{
59			int foldLevel = buffer.getFoldLevel(lineIndex - 1);
60
61			buffer.getLineText(lineIndex - 1,seg);
62
63			int offset = seg.offset;
64			int count = seg.count;
65
66			int openingBrackets = 0, closingBrackets = 0;
67			for(int i = 0; i < count; i++)
68			{
69				switch(seg.array[offset + i])
70				{
71				case '{':
72					closingBrackets = 0;
73					openingBrackets++;
74					if(openingBrackets == 3)
75					{
76						foldLevel++;
77						openingBrackets = 0;
78					}
79					break;
80				case '}':
81					openingBrackets = 0;
82					closingBrackets++;
83					if(closingBrackets == 3)
84					{
85						if(foldLevel > 0)
86							foldLevel--;
87						closingBrackets = 0;
88					}
89					break;
90				default:
91					closingBrackets = openingBrackets = 0;
92					break;
93				}
94			}
95
96			return foldLevel;
97		}
98	} //}}}
99}