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/jEdit/tags/jedit-4-0-pre3/org/gjt/sp/jedit/buffer/ExplicitFoldHandler.java

#
Java | 97 lines | 51 code | 7 blank | 39 comment | 8 complexity | 748915330b770a8bf6cd60e00cb04484 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;
26import org.gjt.sp.jedit.Buffer;
27
28/**
29 * A fold handler that folds lines based markers embedded in the text.
30 * ("{{{"
31 * and "}}}").
32 * @author Slava Pestov
33 * @version $Id: ExplicitFoldHandler.java 3832 2001-10-10 10:07:05Z spestov $
34 * @since jEdit 4.0pre1
35 */
36public class ExplicitFoldHandler implements FoldHandler
37{
38	//{{{ getFoldLevel() method
39	/**
40	 * Returns the fold level of the specified line.
41	 * @param buffer The buffer in question
42	 * @param lineIndex The line index
43	 * @param seg A segment the fold handler can use to obtain any
44	 * text from the buffer, if necessary
45	 * @return The fold level of the specified line
46	 * @since jEdit 4.0pre1
47	 */
48	public int getFoldLevel(Buffer buffer, int lineIndex, Segment seg)
49	{
50		if(lineIndex == 0)
51			return 0;
52		else
53		{
54			int tabSize = buffer.getTabSize();
55			int foldLevel = buffer.getFoldLevel(lineIndex - 1);
56
57			buffer.getLineText(lineIndex - 1,seg);
58
59			int offset = seg.offset;
60			int count = seg.count;
61
62			int openingBrackets = 0, closingBrackets = 0;
63loop:			for(int i = 0; i < count; i++)
64			{
65				switch(seg.array[offset + i])
66				{
67				case '{':
68					closingBrackets = 0;
69					openingBrackets++;
70					if(openingBrackets == 3)
71					{
72						foldLevel += tabSize;
73						break loop;
74					}
75					else
76						break;
77				case '}':
78					openingBrackets = 0;
79					closingBrackets++;
80					if(closingBrackets == 3)
81					{
82						if(foldLevel >= tabSize)
83							foldLevel -= tabSize;
84						break loop;
85					}
86					else
87						break;
88				default:
89					closingBrackets = openingBrackets = 0;
90					break;
91				}
92			}
93
94			return foldLevel;
95		}
96	} //}}}
97}