mainclass.java

语法分析器

/**
 * this is the main class
 * @author:贺静
 * @version: 1.2
 */
import java.awt.BorderLayout;
import javax.swing.BorderFactory;
import javax.swing.JFileChooser;
import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.JMenuBar; 
import javax.swing.JPopupMenu;
import javax.swing.JSplitPane;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JMenu;
import javax.swing.JButton;
import javax.swing.LookAndFeel;

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import javax.swing.JMenuItem;
import javax.swing.JCheckBox;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;

public class MainClass extends JFrame implements ActionListener, MouseListener, ItemListener, DocumentListener {

	private static final long serialVersionUID = 1L;

	private JPanel jContentPane = null;

	private JSplitPane jSplitPane = null;

	private JScrollPane leftScrollPane = null;

	private JTextArea inputTextArea, outTextArea;

	private JScrollPane rightScrollPane = null;

	private JPanel jPanel = null;

	private JButton openButton, scanButton;

	private JFileChooser fileChooser = new JFileChooser();

	private JMenu jMenu = null;

	private JMenuBar clearBar = null;

	private JMenuItem inputItem, outputItem, allItem, pm1, pm2, pm3;

	private JPopupMenu pm = new JPopupMenu();

	private JCheckBox jCheckBox = null;
	
	private MultilineLabel lineLabel=new MultilineLabel("");
	
	private int lineNo;

	// return javax.swing.JPanel
	private JPanel getJContentPane() {
		if (jContentPane == null) {
			jContentPane = new JPanel();
			jContentPane.setLayout(new BorderLayout());
			jContentPane.add(getJPanel(), java.awt.BorderLayout.NORTH);
			jContentPane.add(getJSplitPane(), java.awt.BorderLayout.CENTER);
		}
		return jContentPane;
	}

	// @return javax.swing.JSplitPane
	private JSplitPane getJSplitPane() {
		if (jSplitPane == null) {
			jSplitPane = new JSplitPane();
			jSplitPane.setDividerLocation(330);
			jSplitPane.setRightComponent(getRightScrollPane());
			jSplitPane.setLeftComponent(getLeftScrollPane());
			jSplitPane.setOneTouchExpandable(true);
		}
		return jSplitPane;
	}

	private JPanel getJPanel() {
		if (jPanel == null) {
			FlowLayout flowLayout = new FlowLayout();
			flowLayout.setAlignment(java.awt.FlowLayout.LEFT);
			jPanel = new JPanel();
			jPanel.setBackground(new java.awt.Color(224, 255, 255));
			jPanel.setLayout(flowLayout);
			jPanel.setPreferredSize(new java.awt.Dimension(10, 30));
			jPanel.add(getOpenButton(), null);
			jPanel.add(getScanButton(), null);
			jPanel.add(getClearBar());
			jPanel.add(getJCheckBox(), null);
		}
		return jPanel;
	}

	// return javax.swing.JMenuBar
	private JMenuBar getClearBar() {
		if (clearBar == null) {
			clearBar = new JMenuBar();
			clearBar.setBackground(new java.awt.Color(241, 255, 255));
			clearBar.add(getJMenu());
		}
		return clearBar;
	}

	// return javax.swing.JScrollPane
	private JScrollPane getLeftScrollPane() {
		if (leftScrollPane == null) {
			leftScrollPane = new JScrollPane();
			leftScrollPane.setBorder(BorderFactory.createCompoundBorder(
					BorderFactory.createTitledBorder("input"), BorderFactory
							.createEmptyBorder()));
			leftScrollPane.setBackground(new java.awt.Color(239, 255, 255));
			lineLabel.setVisible(false);
			lineLabel.setFont(new java.awt.Font("Dialog",
					java.awt.Font.BOLD, 14));
			leftScrollPane.setRowHeaderView(lineLabel);
			leftScrollPane.setViewportView(getInputTextArea());
		}
		return leftScrollPane;
	}

	// return javax.swing.JTextArea
	private JTextArea getInputTextArea() {
		if (inputTextArea == null) {
			inputTextArea = new JTextArea();
			inputTextArea.setFont(new java.awt.Font("Dialog", java.awt.Font.PLAIN, 14));
			inputTextArea.addMouseListener(this);
			pm = new JPopupMenu();
			pm1 = new JMenuItem("剪切");
			pm1.setBackground(new java.awt.Color(241, 255, 255));
			pm2 = new JMenuItem("复制");
			pm2.setBackground(new java.awt.Color(241, 255, 255));
			pm3 = new JMenuItem("粘贴");
			pm3.setBackground(new java.awt.Color(241, 255, 255));
			pm.add(pm1);
			pm.add(pm2);
			pm.add(pm3);
			inputTextArea.add(pm);
		}
		return inputTextArea;
	}

	// return javax.swing.JScrollPane
	private JScrollPane getRightScrollPane() {
		if (rightScrollPane == null) {
			rightScrollPane = new JScrollPane();
			rightScrollPane.setBorder(BorderFactory.createCompoundBorder(
					BorderFactory.createTitledBorder("output"), BorderFactory
							.createEmptyBorder()));
			rightScrollPane.setBackground(new java.awt.Color(239, 255, 255));
			rightScrollPane.setViewportView(getOutTextArea());
		}
		return rightScrollPane;
	}

	// @return javax.swing.JTextArea
	private JTextArea getOutTextArea() {
		if (outTextArea == null) {
			outTextArea = new JTextArea();
			outTextArea.setFont(new java.awt.Font("Dialog",
					java.awt.Font.PLAIN, 14));
			outTextArea.setEditable(false);
		}
		return outTextArea;
	}

	// @return javax.swing.JButton
	private JButton getOpenButton() {
		if (openButton == null) {
			openButton = new JButton();
			openButton.setText("Open");
			openButton.setBackground(new java.awt.Color(241, 255, 255));
			openButton.setFont(new java.awt.Font("DialogInput",
					java.awt.Font.BOLD, 12));
			openButton.setBorderPainted(false);
		}
		return openButton;
	}

	// return javax.swing.JButton
	private JButton getScanButton() {
		if (scanButton == null) {
			scanButton = new JButton();
			scanButton.setText("Analyze");
			scanButton.setBackground(new java.awt.Color(241, 255, 255));
			scanButton.setBorderPainted(false);
		}
		return scanButton;
	}
	/**
	 * This method initializes jCheckBox	
	 * 	
	 * @return javax.swing.JCheckBox	
	 */
	private JCheckBox getJCheckBox() {
		if (jCheckBox == null) {
			jCheckBox = new JCheckBox();
			jCheckBox.setText("LineNo");
			jCheckBox.setBackground(new java.awt.Color(241, 255, 255));
			jCheckBox.addItemListener(this);
		}
		return jCheckBox;
	}
	/**
	 * This is the default constructor
	 */
	public MainClass() {
		super();
		initialize();
	}

	/**
	 * This method initializes this
	 */
	private void initialize() {
		this.setBackground(new java.awt.Color(238, 238, 238));
		this.setBounds(new java.awt.Rectangle(160, 50, 673, 547));
		this.setContentPane(getJContentPane());
		this.setTitle("词法分析");
		this.setVisible(true);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
		openButton.addActionListener(this);
		scanButton.addActionListener(this);
		inputItem.addActionListener(this);
		outputItem.addActionListener(this);
		allItem.addActionListener(this);
		pm1.addActionListener(this);
		pm2.addActionListener(this);
		pm3.addActionListener(this);
	}

	// return javax.swing.JMenu
	private JMenu getJMenu() {
		if (jMenu == null) {
			jMenu = new JMenu();
			// jMenu.setBackground(new java.awt.Color(241,255,255));
			jMenu.setText("Clear");
			jMenu.setFont(new java.awt.Font("DialogInput", java.awt.Font.BOLD,
					12));
			inputItem = new JMenuItem("Clear InputBox");
			inputItem.setBackground(new java.awt.Color(241, 255, 255));
			outputItem = new JMenuItem("Clear OutputBox");
			outputItem.setBackground(new java.awt.Color(241, 255, 255));
			allItem = new JMenuItem("Clear All");
			allItem.setBackground(new java.awt.Color(241, 255, 255));
			jMenu.add(inputItem);
			jMenu.add(outputItem);
			jMenu.add(allItem);
		}
		return jMenu;
	}

	public void openFile() {
		int result = fileChooser.showOpenDialog(null);
		if (result == JFileChooser.APPROVE_OPTION) {
			try {
				File fileName = fileChooser.getSelectedFile();
				BufferedReader input = new BufferedReader(new FileReader(
						fileName));
				String line = input.readLine();
				inputTextArea.setText("");
				while (line != null) {
					inputTextArea.append(line + "\n");
					line = input.readLine();
				}
				input.close();
			} catch (IOException ioe) {
				System.out.println(ioe.toString());
			} catch (NullPointerException Ex) {
				System.out.println();
			} catch (Exception ex) {
				System.out.println();
			}
		}
	}
	public void changeLabel(){
		
		if (inputTextArea.getLineCount() != lineNo) {
			lineNo = inputTextArea.getLineCount();
			String s = "";
			for (int j = 1; j <= lineNo; j++) {
				s += j + "\n";
			}
			 lineLabel.setText(s);
		}
	}
	//scan.setBufferInput(s);
	public void actionPerformed(ActionEvent e) {
		if (e.getSource() == openButton) {
			openFile();
		} else if (e.getSource() == scanButton) {
			String s = inputTextArea.getText();
			if (s.equals("")) {
				outTextArea
						.setText("ERROR: Please input strings in the leftbox!");
			} else {
				LexAna scan = new LexAna();
				scan.setBufferInput(s);
				Parse parse=new Parse(scan);
				try {
					AST program=parse.parseAna();
					outTextArea.setText(parse.getPrint(program)
							+"\n"+parse.getErrorToken());
				} catch (Exception e1) {
//					outTextArea.setText("Exception");
					e1.printStackTrace();
				}
			}
		} else if (e.getSource() == inputItem)
			inputTextArea.setText("");
		else if (e.getSource() == outputItem)
			outTextArea.setText("");
		else if (e.getSource() == allItem) {
			inputTextArea.setText("");
			outTextArea.setText("");
		} else if (e.getSource() == pm1) {
			inputTextArea.cut();
		} else if (e.getSource() == pm2) {
			inputTextArea.copy();
		} else if (e.getSource() == pm3)
			inputTextArea.paste();
	}

	public void mouseReleased(MouseEvent e) {
		try {
			if (e.isPopupTrigger()) {
				pm.show(this, e.getX(), e.getY());
			}
		} catch (NullPointerException ex) {
		} catch (Exception exception) {
		}
	}

	public void mouseEntered(MouseEvent e) {
	}

	public void mouseClicked(MouseEvent e) {
	}

	public void mouseExited(MouseEvent e) {
	}

	public void mousePressed(MouseEvent e) {
	}

	public static void main(String[] args) {
		new MainClass();
	}

	public void itemStateChanged(ItemEvent e) {
		if(e.getSource()==jCheckBox){
			if(jCheckBox.isSelected()){
				inputTextArea.getDocument().addDocumentListener(this);
				lineNo=0;
				changeLabel();
				lineLabel.setVisible(true);
			}else{
				inputTextArea.getDocument().removeDocumentListener(this);
				lineLabel.setText("");
				lineLabel.setVisible(false);
		}}
	}

	public void insertUpdate(DocumentEvent e) {
		changeLabel();
	}

	public void removeUpdate(DocumentEvent e) {
		changeLabel();
		
	}

	public void changedUpdate(DocumentEvent e) {
		changeLabel();
	}
} 

//create a label supporting multiline by extending JTextArea
class MultilineLabel extends JTextArea {
	private static final long serialVersionUID = (long) 1.2;
	public MultilineLabel(String s) {
		super(s);
	}
	public void updateUI() {
		super.updateUI();
		setWrapStyleWord(true);
		setHighlighter(null);
		setEditable(false);
		LookAndFeel.installBorder(this, "Label.border");
		LookAndFeel.installColorsAndFont(this, "Label.background",
				"Label.foreground", "Label.font");
	}
	
}