/jEdit/tags/jedit-4-2-pre4/org/gjt/sp/jedit/buffer/IndentFoldHandler.java
Java | 90 lines | 42 code | 10 blank | 38 comment | 4 complexity | ca257cab1875a706816a4950d85d0659 MD5 | raw file
Possible License(s): BSD-3-Clause, AGPL-1.0, Apache-2.0, LGPL-2.0, LGPL-3.0, GPL-2.0, CC-BY-SA-3.0, LGPL-2.1, GPL-3.0, MPL-2.0-no-copyleft-exception, IPL-1.0
- /*
- * IndentFoldHandler.java - Indent-based fold handler
- * :tabSize=8:indentSize=8:noTabs=false:
- * :folding=explicit:collapseFolds=1:
- *
- * Copyright (C) 2001, 2002 Slava Pestov
- *
- * 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 org.gjt.sp.jedit.buffer;
- import javax.swing.text.Segment;
- import org.gjt.sp.jedit.Buffer;
- /**
- * A fold handler that folds lines based on their indent level.
- * @author Slava Pestov
- * @version $Id: IndentFoldHandler.java 4092 2002-03-17 01:28:44Z spestov $
- * @since jEdit 4.0pre1
- */
- public class IndentFoldHandler extends FoldHandler
- {
- public IndentFoldHandler()
- {
- super("indent");
- }
- //{{{ getFoldLevel() method
- /**
- * Returns the fold level of the specified line.
- * @param buffer The buffer in question
- * @param lineIndex The line index
- * @param seg A segment the fold handler can use to obtain any
- * text from the buffer, if necessary
- * @return The fold level of the specified line
- * @since jEdit 4.0pre1
- */
- public int getFoldLevel(Buffer buffer, int lineIndex, Segment seg)
- {
- int tabSize = buffer.getTabSize();
- buffer.getLineText(lineIndex,seg);
- int offset = seg.offset;
- int count = seg.count;
- int whitespace = 0;
- boolean seenNonWhiteSpace = false;
- loop: for(int i = 0; i < count; i++)
- {
- switch(seg.array[offset + i])
- {
- case ' ':
- whitespace++;
- break;
- case '\t':
- whitespace += (tabSize - whitespace % tabSize);
- break;
- default:
- seenNonWhiteSpace = true;
- break loop;
- }
- }
- if(!seenNonWhiteSpace)
- {
- // empty line. inherit previous line's fold level
- if(lineIndex != 0)
- return buffer.getFoldLevel(lineIndex - 1);
- else
- return 0;
- }
- return whitespace;
- } //}}}
- }