Decompiler for AutoHotKey - Written in early 2015

Decompiler.java

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.Toolkit;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.StringSelection;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;

import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.UIManager;

public class Decompiler extends JFrame {
	private static final long serialVersionUID = -1554777358761015720L;
	public static void main(String[] args) {
		try {
			UIManager.setLookAndFeel( UIManager.getSystemLookAndFeelClassName() );
		} catch( Exception e ) {
			// Problem changing UI occured. Ignore and show in default mode instead.
		}
		new Decompiler();
	}
	public Decompiler() {
		setPreferredSize(new Dimension(600,200));
		pack();
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		setLocationRelativeTo(null);
		setTitle("LuxXx' AHK Decompiler v0.1");
		setLayout(new GridLayout(1,2));
		JButton decompile = new JButton("Decompile File");
		decompile.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				JFileChooser ch = new JFileChooser();
				int result = ch.showOpenDialog(Decompiler.this);
				if (result == JFileChooser.APPROVE_OPTION) {		
					try {
						File file = ch.getSelectedFile();
						decompileFile(file);
					} catch (FileNotFoundException e1) {
						e1.printStackTrace();
					}	
				}
			}
		});
		add(decompile);
		
		JButton decompilepackedExe = new JButton("Decompile packed executable");
		decompilepackedExe.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				//JOptionPane.showMessageDialog(Decompiler.this, "Coming soon!");
				String code = "notImplementedYet";
				printCode(code);
			}
		});
		add(decompilepackedExe);
		
		
		setVisible(true);
	}
	private void decompileFile(File selectedFile) throws FileNotFoundException {
		// TODO Auto-generated method stub

		BufferedReader br = new BufferedReader(new FileReader(selectedFile));
		String line;
		StringBuilder code = new StringBuilder();
		boolean showLines = false;
		try {
			while ((line = br.readLine()) != null) {

				// 
				if (line.contains("<assembly ")) {
					showLines = false;
				}
				if(showLines) {
					code.append(line + "\n");
				}
				// wenn start des codes gefunden setze, show lines auf true
				if (line.contains("<COMPILER: v")) {
					showLines = true;
				}
			}

			br.close();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		printCode(code.toString());

	}
	
	private void printCode(String code) {
		if (code.length() < 1) {
			JOptionPane.showMessageDialog(this, "Konnte Datei nicht decompilieren");
			return;
		}
		
		
		JFrame popup = new JFrame();
		popup.setPreferredSize(new Dimension((int)Toolkit.getDefaultToolkit().getScreenSize().getWidth()-200,(int)Toolkit.getDefaultToolkit().getScreenSize().getHeight()-200));
		popup.pack();
		popup.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
		popup.setLocationRelativeTo(this);
		popup.setTitle("Decompiled Result");
		popup.setLayout(new BorderLayout());
		JTextArea text = new JTextArea(code.replaceAll("[^\\x00-\\x7F]", ""));
		text.setEditable(true);
		JScrollPane sp = new JScrollPane(text);
		popup.add(sp,BorderLayout.CENTER);
		
		JButton copy = new JButton("Copy to clipboard");
		copy.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				StringSelection selection = new StringSelection(code);
				Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
				clipboard.setContents(selection, selection);
				JOptionPane.showMessageDialog(popup, "Code kopiert");
			}
		});
		
		popup.add(copy,BorderLayout.SOUTH);
		popup.setVisible(true);
		
		JLabel info = new JLabel("Bitte die letzten Zeilen des Codes überprüfen.");
		info.setHorizontalAlignment(JLabel.CENTER);
		info.setForeground(Color.RED);
		popup.add(info, BorderLayout.NORTH);
	}
}