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Groovy example source code file (LexerFrame.java)

This example Groovy source code file (LexerFrame.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

awt, border, border, class, class, event, exception, exception, gui, hashtable, jbutton, jfilechooser, jscrollpane, jscrollpane, jtextpane, jtogglebutton, reflection, swing, token, token

The Groovy LexerFrame.java source code

/*
 * Copyright 2003-2007 the original author or authors.
 *
 * 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.codehaus.groovy.antlr;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.lang.reflect.*;
import java.util.Hashtable;

import javax.swing.*;
import javax.swing.border.Border;
import javax.swing.text.BadLocationException;
import org.codehaus.groovy.antlr.parser.*;

import antlr.*;

/**
 * @author Santhosh Kumar T
 * @version 1.0
 */

public class LexerFrame extends JFrame implements ActionListener{
    JSplitPane jSplitPane1 = new JSplitPane();
    JScrollPane jScrollPane1 = new JScrollPane();
    JScrollPane jScrollPane2 = new JScrollPane();
    JTextPane tokenPane = new HScrollableTextPane();
    JButton jbutton = new JButton("open");
    JPanel mainPanel = new JPanel(new BorderLayout());
    JTextArea scriptPane = new JTextArea();
    Border border1;
    Border border2;

    Class lexerClass;

    public LexerFrame(Class lexerClass, Class tokenTypesClass){
        super("Token Steam Viewer");
        this.lexerClass = lexerClass;
        try{
            jbInit();
            setSize(500, 500);
            listTokens(tokenTypesClass);

            final JPopupMenu popup = new JPopupMenu();
            popup.add(loadFileAction);

            jbutton.setSize(30,30);
            jbutton.addMouseListener(new MouseAdapter(){
                public void mouseReleased(MouseEvent e) {
                    //if(e.isPopupTrigger())
                        popup.show(scriptPane, e.getX(), e.getY());
                }
            });
            setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        } catch(Exception e){
            e.printStackTrace();
        }
    }

    Hashtable tokens = new Hashtable();

    private void listTokens(Class tokenTypes) throws Exception{
        Field field[] = tokenTypes.getDeclaredFields();
        for(int i = 0; i<field.length; i++)
            tokens.put(field[i].get(null), field[i].getName());
    }

    public void actionPerformed(ActionEvent ae){
        Token token = (Token) ((JComponent) ae.getSource()).getClientProperty("token");
        if(token.getType()==Token.EOF_TYPE){
            scriptPane.select(0, 0);
            return;
        }
        try{
            int start = scriptPane.getLineStartOffset(token.getLine()-1)+token.getColumn()-1;
            scriptPane.select(start, start+token.getText().length());
            scriptPane.requestFocus();
        } catch(BadLocationException ex){
            // IGNORE
        }
    }

    private Action loadFileAction = new AbstractAction("Open File..."){
        public void actionPerformed(ActionEvent ae){
            JFileChooser jfc = new JFileChooser();
            int response = jfc.showOpenDialog(LexerFrame.this);
            if(response!=JFileChooser.APPROVE_OPTION)
                return;
            try{
                scanScript(jfc.getSelectedFile());
            } catch(Exception ex){
                ex.printStackTrace();
            }
        }
    };

    private void scanScript(File file) throws Exception{
        scriptPane.read(new FileReader(file), null);

        // create lexer
        Constructor constructor = lexerClass.getConstructor(new Class[]{InputStream.class});
        CharScanner lexer = (CharScanner) constructor.newInstance(new Object[]{new FileInputStream(file)});

        tokenPane.setEditable(true);
        tokenPane.setText("");

        int line = 1;
        ButtonGroup bg = new ButtonGroup();
        Token token = null;

        while(true){
            token = lexer.nextToken();
            JToggleButton tokenButton = new JToggleButton((String) tokens.get(Integer.valueOf(token.getType())));
            bg.add(tokenButton);
            tokenButton.addActionListener(this);
            tokenButton.setToolTipText(token.getText());
            tokenButton.putClientProperty("token", token);
            tokenButton.setMargin(new Insets(0, 1, 0, 1));
            tokenButton.setFocusPainted(false);
            if(token.getLine()>line){
                tokenPane.getDocument().insertString(tokenPane.getDocument().getLength(), "\n", null);
                line = token.getLine();
            }
            insertComponent(tokenButton);
            if(token.getType()==Token.EOF_TYPE)
                break;
        }

        tokenPane.setEditable(false);
        tokenPane.setCaretPosition(0);
    }

    private void insertComponent(JComponent comp){
        try{
            tokenPane.getDocument().insertString(tokenPane.getDocument().getLength(), " ", null);
        } catch(BadLocationException ex1){
            // Ignore
        }
        try{
            tokenPane.setCaretPosition(tokenPane.getDocument().getLength()-1);
        } catch(Exception ex){
            tokenPane.setCaretPosition(0);
        }
        tokenPane.insertComponent(comp);
    }

    private void jbInit() throws Exception{
        border1 = BorderFactory.createEmptyBorder();
        border2 = BorderFactory.createEmptyBorder();
        jSplitPane1.setOrientation(JSplitPane.VERTICAL_SPLIT);
        tokenPane.setEditable(false);
        tokenPane.setText("");
        scriptPane.setFont(new java.awt.Font("DialogInput", 0, 12));
        scriptPane.setEditable(false);
        scriptPane.setMargin(new Insets(5, 5, 5, 5));
        scriptPane.setText("");
        jScrollPane1.setBorder(border1);
        jScrollPane2.setBorder(border1);
        jSplitPane1.setMinimumSize(new Dimension(800,600));
        mainPanel.add(jSplitPane1, BorderLayout.CENTER);
        mainPanel.add(jbutton,BorderLayout.NORTH);
        this.getContentPane().add(mainPanel);
        jSplitPane1.add(jScrollPane1, JSplitPane.LEFT);
        jScrollPane1.getViewport().add(tokenPane, null);
        jSplitPane1.add(jScrollPane2, JSplitPane.RIGHT);
        jScrollPane2.getViewport().add(scriptPane, null);

        jScrollPane1.setColumnHeaderView(new JLabel(" Token Stream:"));
        jScrollPane2.setColumnHeaderView(new JLabel(" Input Script:"));
        jSplitPane1.setResizeWeight(0.5);
    }

    public static void main(String[] args) throws Exception{
        try{
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch(Exception ignore){
            // Ignore
        }
        new LexerFrame(GroovyLexer.class, GroovyTokenTypes.class).setVisible(true);
    }
}


class HScrollableTextPane extends JTextPane{
    public boolean getScrollableTracksViewportWidth(){
        return(getSize().width<getParent().getSize().width);
    }

    public void setSize(Dimension d){
        if(d.width<getParent().getSize().width){
            d.width = getParent().getSize().width;
        }
        super.setSize(d);
    }
}

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