/*
* Copyright 2010 JBoss Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.drools.eclipse.editors.scanners;
import java.util.ArrayList;
import java.util.List;
import org.drools.eclipse.editors.ColorManager;
import org.drools.eclipse.editors.Keywords;
import org.eclipse.jface.text.TextAttribute;
import org.eclipse.jface.text.rules.EndOfLineRule;
import org.eclipse.jface.text.rules.IRule;
import org.eclipse.jface.text.rules.IToken;
import org.eclipse.jface.text.rules.RuleBasedScanner;
import org.eclipse.jface.text.rules.SingleLineRule;
import org.eclipse.jface.text.rules.Token;
import org.eclipse.jface.text.rules.WhitespaceRule;
import org.eclipse.jface.text.rules.WordRule;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
/**
* Basic keyword scanner for syntax highlighting.
*/
public class DRLScanner extends RuleBasedScanner {
private static final Color KEYWORD_COLOR = ColorManager.getInstance().getColor(ColorManager.KEYWORD);
private static final Color COMMENT_COLOR = ColorManager.getInstance().getColor(ColorManager.SINGLE_LINE_COMMENT);
private static final Color STRING_COLOR = ColorManager.getInstance().getColor(ColorManager.STRING);
private static final String[] DROOLS_KEYWORDS = Keywords.getInstance().getAllDroolsKeywords();
private static final String[] JAVA_KEYWORDS = Keywords.getInstance().getAllJavaKeywords();
private static final String[] MVEL_KEYWORDS = Keywords.getInstance().getAllMvelKeywords();
private static final String[] JAVA_TYPES = { "void", "boolean", "char", "byte", "short", "strictfp", "int", "long", "float", "double" };
private static final String[] JAVA_CONSTANTS = { "false", "true", "null" };
private static final String[] MVEL_CONSTANTS = { "false", "true", "null", "nil", "empty", "this" };
public DRLScanner() {
IToken keyword = new Token(new TextAttribute(KEYWORD_COLOR, null, SWT.BOLD));
IToken comment= new Token(new TextAttribute(COMMENT_COLOR));
IToken string = new Token(new TextAttribute(STRING_COLOR));
IToken other = new Token(null);
List<IRule> rules = new ArrayList<IRule>();
rules.add(new EndOfLineRule("//", comment));
rules.add(new EndOfLineRule("#", comment));
// Add rule for strings and character constants.
rules.add(new SingleLineRule("\"", "\"", string, '\\'));
rules.add(new SingleLineRule("'", "'", string, '\\'));
//for unfilled "holes"
//rules.add(new SingleLineRule("{", "}", comment));
// Add generic whitespace rule.
rules.add(new WhitespaceRule(new WhitespaceDetector()));
// Add word rule for keywords, types, and constants.
WordRule wordRule= new WordRule(new RuleWordDetector(), other);
for (int i= 0; i < DROOLS_KEYWORDS.length; i++)
wordRule.addWord(DROOLS_KEYWORDS[i], keyword);
for (int i= 0; i < JAVA_KEYWORDS.length; i++)
wordRule.addWord(JAVA_KEYWORDS[i], keyword);
for (int i= 0; i < JAVA_TYPES.length; i++)
wordRule.addWord(JAVA_TYPES[i], keyword);
for (int i= 0; i < JAVA_CONSTANTS.length; i++)
wordRule.addWord(JAVA_CONSTANTS[i], keyword);
//FIXME: this a bit brutal. we should identify different highlighting for Java and Mvel
for (int i= 0; i < MVEL_KEYWORDS.length; i++)
wordRule.addWord(MVEL_KEYWORDS[i], keyword);
for (int i= 0; i < MVEL_CONSTANTS.length; i++)
wordRule.addWord(MVEL_CONSTANTS[i], keyword);
rules.add(wordRule);
IRule[] result= new IRule[rules.size()];
rules.toArray(result);
setRules(result);
}
}