/*
* JBoss by Red Hat
* Copyright 2006-2009, Red Hat Middleware, LLC, and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.ide.eclipse.freemarker.editor.rules;
import java.util.Stack;
import org.eclipse.jface.text.rules.ICharacterScanner;
import org.eclipse.jface.text.rules.IToken;
import org.eclipse.jface.text.rules.SingleLineRule;
/**
* @author <a href="mailto:joe@binamics.com">Joe Hudson</a>
*/
public class InterpolationRule extends SingleLineRule {
public InterpolationRule(char startChar, IToken token) {
super(startChar + "{", "}", token); //$NON-NLS-1$ //$NON-NLS-2$
}
protected boolean endSequenceDetected(ICharacterScanner scanner) {
int c;
char[][] delimiters= scanner.getLegalLineDelimiters();
boolean previousWasEscapeCharacter = false;
Stack keyStack = new Stack();
int charsRead = 0;
while ((c= scanner.read()) != ICharacterScanner.EOF) {
charsRead ++;
char cCheck = (char) c;
if (c == '{') {
if (keyStack.size() == 0) {
break;
}
}
else if (c == '\"') {
if (keyStack.size() > 0 && keyStack.peek().equals("\"")) { //$NON-NLS-1$
keyStack.pop();
}
else {
keyStack.push("\""); //$NON-NLS-1$
}
}
else if (c == '(') {
if (keyStack.size() > 0 && keyStack.peek().equals("\"")) { //$NON-NLS-1$
// string... don't add to stack
}
else {
keyStack.push("("); //$NON-NLS-1$
}
}
else if (c == ')') {
if (keyStack.size() > 0 && keyStack.peek().equals("\"")) { //$NON-NLS-1$
// string... don't add to stack
}
else if (keyStack.size() > 0 && keyStack.peek().equals("(")) { //$NON-NLS-1$
keyStack.pop();
}
}
else if (c == fEscapeCharacter) {
// Skip the escaped character.
scanner.read();
charsRead ++;
}
else if (c == '}') {
if (keyStack.size() == 0) {
return true;
}
}
else if (c == '\n') {
break;
}
previousWasEscapeCharacter = (c == fEscapeCharacter);
}
if (fBreaksOnEOF) return true;
for (int i=0; i<charsRead; i++)
scanner.unread();
return false;
}
}