/*******************************************************************************
 * Copyright (c) 2004 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
 *******************************************************************************/
package org.eclipse.jst.jsp.ui.internal.style.java;


import java.util.ArrayList;
import java.util.List;

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.MultiLineRule;
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.graphics.Color;
import org.eclipse.wst.sse.ui.util.EditorUtility;

/**
 * A Java code scanner.
 */
public class JavaCodeScanner extends org.eclipse.jface.text.rules.RuleBasedScanner {

	private static String[] fgKeywords = {"abstract", //$NON-NLS-1$
				"break", //$NON-NLS-1$
				"case", "catch", "class", "continue", //$NON-NLS-4$//$NON-NLS-3$//$NON-NLS-2$//$NON-NLS-1$
				"default", "do", //$NON-NLS-2$//$NON-NLS-1$
				"else", "extends", //$NON-NLS-2$//$NON-NLS-1$
				"final", "finally", "for", //$NON-NLS-3$//$NON-NLS-2$//$NON-NLS-1$
				"if", "implements", "import", "instanceof", "interface", //$NON-NLS-5$//$NON-NLS-4$//$NON-NLS-3$//$NON-NLS-2$//$NON-NLS-1$
				"native", "new", //$NON-NLS-2$//$NON-NLS-1$
				"package", "private", "protected", "public", //$NON-NLS-4$//$NON-NLS-3$//$NON-NLS-2$//$NON-NLS-1$
				"return", //$NON-NLS-1$
				"static", "super", "switch", "synchronized", //$NON-NLS-4$//$NON-NLS-3$//$NON-NLS-2$//$NON-NLS-1$
				"this", "throw", "throws", "transient", "try", //$NON-NLS-5$//$NON-NLS-4$//$NON-NLS-3$//$NON-NLS-2$//$NON-NLS-1$
				"volatile", //$NON-NLS-1$
				"while", //$NON-NLS-1$
				"strictfp",//$NON-NLS-1$
	};
	private static String[] fgTypes = {"void", "boolean", "char", "byte", "short", "int", "long", "float", "double"};//$NON-NLS-9$//$NON-NLS-8$//$NON-NLS-7$//$NON-NLS-6$//$NON-NLS-5$//$NON-NLS-4$//$NON-NLS-3$//$NON-NLS-2$//$NON-NLS-1$
	private static String[] fgConstants = {"false", "null", "true"};//$NON-NLS-3$//$NON-NLS-2$//$NON-NLS-1$

	/**
	 * Creates a Java code scanner
	 */
	public JavaCodeScanner() {
		// if we use null here, system default will be used
		Color background = null; //provider.getColor(JavaColorProvider.EDITOR_BACKGROUND);
		
		JavaColorProvider.getInstance().loadJavaColors();
		IToken keyword = new Token(new TextAttribute(EditorUtility.getColor(JavaColorProvider.KEYWORD), background, JavaColorProvider.KEYWORD_BOLD));
		IToken type = new Token(new TextAttribute(EditorUtility.getColor(JavaColorProvider.TYPE), background, JavaColorProvider.TYPE_BOLD));
		IToken string = new Token(new TextAttribute(EditorUtility.getColor(JavaColorProvider.STRING), background, JavaColorProvider.STRING_BOLD));
		IToken comment = new Token(new TextAttribute(EditorUtility.getColor(JavaColorProvider.SINGLE_LINE_COMMENT), background, JavaColorProvider.SINGLE_LINE_COMMENT_BOLD));
		IToken other = new Token(new TextAttribute(EditorUtility.getColor(JavaColorProvider.DEFAULT), background, JavaColorProvider.DEFAULT_BOLD));


		List rules = new ArrayList();

		// Add rule for multiple line comments.
		rules.add(new MultiLineRule("/*", "*/", comment));//$NON-NLS-1$ //$NON-NLS-2$

		// Add rule for single line comments.
		rules.add(new EndOfLineRule("//", comment));//$NON-NLS-1$

		// Add rule for strings and character constants.
		rules.add(new SingleLineRule("\"", "\"", string, '\\'));//$NON-NLS-2$//$NON-NLS-1$
		rules.add(new SingleLineRule("'", "'", string, '\\'));//$NON-NLS-2$//$NON-NLS-1$

		// Add generic whitespace rule.
		rules.add(new WhitespaceRule(new JavaWhitespaceDetector()));

		// Add word rule for keywords, types, and constants.
		WordRule wordRule = new WordRule(new JavaWordDetector(), other);
		for (int i = 0; i < fgKeywords.length; i++)
			wordRule.addWord(fgKeywords[i], keyword);
		for (int i = 0; i < fgTypes.length; i++)
			wordRule.addWord(fgTypes[i], type);
		for (int i = 0; i < fgConstants.length; i++)
			wordRule.addWord(fgConstants[i], type);
		rules.add(wordRule);


		IRule[] result = new IRule[rules.size()];
		rules.toArray(result);
		setRules(result);
	}
}