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/*******************************************************************************
* Copyright (c) 2005, 2007 IBM 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:
* IBM Corporation - initial API and implementation
* Bjorn Freeman-Benson - initial API and implementation
*******************************************************************************/
package org.eclipse.debug.examples.ui.pda.editor;
import org.eclipse.debug.examples.ui.pda.DebugUIPlugin;
import org.eclipse.jface.text.TextAttribute;
import org.eclipse.jface.text.rules.BufferedRuleBasedScanner;
import org.eclipse.jface.text.rules.IRule;
import org.eclipse.jface.text.rules.IWordDetector;
import org.eclipse.jface.text.rules.Token;
import org.eclipse.jface.text.rules.WordRule;
/**
* PDA editor keyword scanner.
*/
public class PDAScanner extends BufferedRuleBasedScanner {
/**
* PDA keywods
*/
public static final String[] fgKeywords = new String[] {
"add", "branch_not_zero", "call", "dec", "dup",
"halt", "output", "pop", "push", "return", "var"
};
/**
* Detects potential keywords
*/
class PDAWordDetector implements IWordDetector {
/* (non-Javadoc)
* @see org.eclipse.jface.text.rules.IWordDetector#isWordStart(char)
*/
public boolean isWordStart(char c) {
return Character.isLetter(c);
}
/* (non-Javadoc)
* @see org.eclipse.jface.text.rules.IWordDetector#isWordPart(char)
*/
public boolean isWordPart(char c) {
return Character.isLetter(c) || c == '_';
}
}
/**
* Detects PDA branch labels
*/
class PDALabelDetector extends PDAWordDetector {
/* (non-Javadoc)
* @see org.eclipse.jface.text.rules.IWordDetector#isWordStart(char)
*/
public boolean isWordStart(char c) {
return c == ':';
}
/* (non-Javadoc)
* @see org.eclipse.jface.text.rules.IWordDetector#isWordPart(char)
*/
public boolean isWordPart(char c) {
return super.isWordPart(c) || Character.isDigit(c);
}
}
/**
* Constructs a scanner that identifies PDA keywords.
*/
public PDAScanner() {
// keywords
Token token = new Token(new TextAttribute(DebugUIPlugin.getDefault().getColor(DebugUIPlugin.KEYWORD)));
WordRule keywords = new WordRule(new PDAWordDetector());
for (int i = 0; i < fgKeywords.length; i++) {
String keyword = fgKeywords[i];
keywords.addWord(keyword, token);
}
// labels
token = new Token(new TextAttribute(DebugUIPlugin.getDefault().getColor(DebugUIPlugin.LABEL)));
WordRule labels = new WordRule(new PDALabelDetector(), token);
setRules(new IRule[]{keywords, labels});
}
}
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