/*
 * SyntaxDocument2.java
 *
 * Created on December 29, 2006, 5:19 PM
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package net.sf.xpontus.view.editor;

import java.io.StringReader;
import java.util.List;
import java.util.Vector;

import javax.swing.event.DocumentEvent;
import javax.swing.text.AttributeSet;
import javax.swing.text.Element;
import javax.swing.text.GapContent;
import javax.swing.text.MutableAttributeSet;
import javax.swing.text.PlainDocument;
import javax.swing.text.SimpleAttributeSet;

import net.sf.xpontus.view.editor.syntax.FastCharStream;
import net.sf.xpontus.view.editor.syntax.Token;
import net.sf.xpontus.view.editor.syntax.java.JavaParser;

/**
 * 
 * @author mrcheeks
 */
public class SyntaxDocument2 extends PlainDocument {

	private ILexer lexer = new JavaParser();

	/** Creates a new instance of SyntaxDocument2 */
	public SyntaxDocument2() {
		super(new GapContent());
	}

	public void relex(DocumentEvent e) {
		int offset = e.getOffset();
		Element root = this.getDefaultRootElement();
		int lineIndex = root.getElementIndex(offset);
		Element lineElement = root.getElement(lineIndex);

		List tokenList = new Vector();

		AttributeSet object = lineElement.getAttributes();

		MutableAttributeSet lineAttributes = null;

		if (object instanceof MutableAttributeSet) {
			lineAttributes = (MutableAttributeSet) object;
		} else {
			lineAttributes = new SimpleAttributeSet(object);
		}

		try {
			int start = lineElement.getStartOffset();
			int end = lineElement.getEndOffset();
			String lineText = getText(start, end);
			lexer.ReInit(new FastCharStream(new StringReader(lineText)));
			Token token = null;

			while ((token = lexer.getNextToken()) != null && token.kind != 0) {
				tokenList.add(token);
			}
		} catch (Exception e1) {
			e1.printStackTrace();
		}

		lineAttributes.addAttribute("tokenList", tokenList);
	}

	protected void fireInsertUpdate(DocumentEvent e) {
		super.fireChangedUpdate(e);
		relex(e);
	}

	protected void fireRemoveUpdate(DocumentEvent e) {
		super.fireRemoveUpdate(e);
		relex(e);
	}
}