/*******************************************************************************
* Copyright (c) 2006, 2012 Oracle Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Oracle Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.bpel.ui.editors.xpath.rules;
import org.eclipse.bpel.ui.editors.xpath.XPathWhitespaceDetector;
import org.eclipse.jface.text.rules.ICharacterScanner;
import org.eclipse.jface.text.rules.IToken;
import org.eclipse.jface.text.rules.IWordDetector;
import org.eclipse.jface.text.rules.Token;
/**
* Functions in XPath start with QName and are followed by a ( The exception are
* the basic nodes XML nodes like
*
*
* @author Michal Chmielewski (michal.chmielewski@oracle.com)
* @date Oct 26, 2006
*
*/
public class FunctionRule extends WordRule {
static final XPathWhitespaceDetector fWhiteSpaceDetector = new XPathWhitespaceDetector ();
/**
* @param detector
*/
public FunctionRule(IWordDetector detector) {
super(detector);
}
/**
* @param words
* @param token
*/
public void addWords(String[] words, IToken token) {
for (int i = 0; i < words.length; i++) {
addWord(words[i], token);
}
}
/**
*
* @see org.eclipse.jface.text.rules.IRule#evaluate(org.eclipse.jface.text.rules.ICharacterScanner)
*/
@Override
public IToken evaluate (ICharacterScanner scanner) {
IToken token = super.evaluate(scanner);
if (token == Token.UNDEFINED) {
return token;
}
// check if the following character is a ( - which is an argument list
// for a
// function. if so then this is a function call name
int cnt = 0;
int ch;
do {
ch = scanner.read();
cnt += 1;
} while (fWhiteSpaceDetector.isWhitespace((char) ch));
if (ch == '(') {
// bingo !
while (cnt > 0) {
scanner.unread();
cnt -= 1;
}
return token;
}
// not a function call, so this is not a valid presentation
unreadBuffer(scanner);
return Token.UNDEFINED;
}
}