/jEdit/tags/jedit-4-5-pre1/org/gjt/sp/jedit/indent/RegexpIndentRule.java
# · Java · 162 lines · 103 code · 14 blank · 45 comment · 17 complexity · 0fcb16cd52d95ad2640dc3bfb9c136ac MD5 · raw file
- /*
- * RegexpIndentRule.java
- * :tabSize=8:indentSize=8:noTabs=false:
- * :folding=explicit:collapseFolds=1:
- *
- * Copyright (C) 2005 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.indent;
- import java.util.List;
- import java.util.regex.Matcher;
- import java.util.regex.Pattern;
- import java.util.regex.PatternSyntaxException;
- import javax.swing.text.Segment;
- import org.gjt.sp.jedit.buffer.JEditBuffer;
- import org.gjt.sp.jedit.syntax.Token;
- import org.gjt.sp.jedit.syntax.TokenHandler;
- import org.gjt.sp.jedit.syntax.TokenMarker;
- /**
- * @author Slava Pestov
- * @version $Id: RegexpIndentRule.java 18919 2010-11-04 10:52:55Z kpouer $
- */
- public class RegexpIndentRule implements IndentRule
- {
- //{{{ RegexpIndentRule constructor
- /**
- * @param collapse If true, then if the next indent rule is
- * an opening bracket, this rule will not increase indent.
- */
- public RegexpIndentRule(String regexp, IndentAction prevPrev,
- IndentAction prev, IndentAction thisLine, boolean collapse)
- throws PatternSyntaxException
- {
- prevPrevAction = prevPrev;
- prevAction = prev;
- thisAction = thisLine;
- this.regexp = Pattern.compile(regexp, Pattern.CASE_INSENSITIVE );
- this.collapse = collapse;
- } //}}}
- //{{{ apply() method
- public void apply(JEditBuffer buffer, int thisLineIndex,
- int prevLineIndex, int prevPrevLineIndex,
- List<IndentAction> indentActions)
- {
- if(thisAction != null
- && lineMatches(buffer, thisLineIndex))
- {
- indentActions.add(thisAction);
- }
- if(prevAction != null
- && prevLineIndex != -1
- && lineMatches(buffer, prevLineIndex))
- {
- indentActions.add(prevAction);
- if (collapse)
- indentActions.add(IndentAction.PrevCollapse);
- }
- if(prevPrevAction != null
- && prevPrevLineIndex != -1
- && lineMatches(buffer, prevPrevLineIndex))
- {
- indentActions.add(prevPrevAction);
- if (collapse)
- indentActions.add(IndentAction.PrevPrevCollapse);
- }
- } //}}}
- //{{{ toString() method
- public String toString()
- {
- return getClass().getName() + '[' + regexp + ']';
- } //}}}
- private IndentAction prevPrevAction, prevAction, thisAction;
- private Pattern regexp;
- private boolean collapse;
- //{{{ class TokenFilter
- /**
- * A filter which removes non syntactic characters in comments
- * or literals which might confuse regexp matchings for indent.
- */
- private static class TokenFilter implements TokenHandler
- {
- public StringBuilder result;
- public TokenFilter(int originalLength)
- {
- result = new StringBuilder(originalLength);
- }
- public void handleToken(Segment seg
- , byte id, int offset, int length
- , TokenMarker.LineContext context)
- {
- // Avoid replacing an empty token into a non empty
- // string.
- if (length <= 0)
- {
- return;
- }
-
- switch (id)
- {
- case Token.COMMENT1:
- case Token.COMMENT2:
- case Token.COMMENT3:
- case Token.COMMENT4:
- // Replace any comments to a white space
- // so that they are simply ignored.
- result.append(' ');
- break;
- case Token.LITERAL1:
- case Token.LITERAL2:
- case Token.LITERAL3:
- case Token.LITERAL4:
- // Replace any literals to a '0' which means
- // a simple integer literal in most programming
- // languages.
- result.append('0');
- break;
- default:
- result.append(seg.array
- , seg.offset + offset
- , length);
- break;
- }
- }
- public void setLineContext(TokenMarker.LineContext lineContext)
- {
- }
- } //}}}
- //{{{ lineMatches() method
- private boolean lineMatches(JEditBuffer buffer, int lineIndex)
- {
- TokenFilter filter
- = new TokenFilter(buffer.getLineLength(lineIndex));
- buffer.markTokens(lineIndex, filter);
- return regexp.matcher(filter.result).matches();
- } //}}}
- }