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The Waikato Environment for Knowledge Analysis (WEKA), a machine learning workbench. This version represents the developer version, the "bleeding edge" of development, you could say. New functionality gets added to this version.
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/*
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program.  If not, see .
 */

/*
 * JythonScript.java
 * Copyright (C) 2009-2012 University of Waikato, Hamilton, New Zealand
 */

package weka.gui.scripting;

import java.io.File;

import javax.swing.text.Document;

import weka.core.Utils;
import weka.core.scripting.Jython;
import weka.gui.ExtensionFileFilter;

/**
 * Represents a Jython
 * script.
 * 
 * @author fracpete (fracpete at waikato dot ac dot nz)
 * @version $Revision: 10222 $
 */
public class JythonScript extends Script {

  /** for serialization. */
  private static final long serialVersionUID = 3469648507172973169L;

  /**
   * Executes a Jython script in a thread.
   * 
   * @author fracpete (fracpete at waikato dot ac dot nz)
   * @version $Revision: 10222 $
   */
  public static class JythonThread extends ScriptThread {

    /**
     * Initializes the thread.
     * 
     * @param owner the owning script
     * @param args the commandline arguments
     */
    public JythonThread(Script owner, String[] args) {
      super(owner, args);
    }

    /**
     * Performs the actual run.
     */
    @Override
    protected void doRun() {
      Jython jython;
      Class[] classes;
      Object[] params;
      String argv;
      String arg;
      int i;

      classes = new Class[] { String.class };
      params = new Object[] { m_Owner.getFilename().getPath() };
      argv = "sys.argv = ['"
        + Utils.backQuoteChars(m_Owner.getFilename().getPath()) + "'";
      for (i = 0; i < getArgs().length; i++) {
        arg = Utils.backQuoteChars(getArgs()[i]);
        argv += ", '" + arg + "'";
      }
      argv += "]";

      jython = new Jython();

      // set commandline parameters
      jython.invoke("exec", new Class[] { String.class },
        new Object[] { "import sys" });
      jython
        .invoke("exec", new Class[] { String.class }, new Object[] { argv });

      jython.invoke("execfile", classes, params);
    }
  }

  /**
   * Initializes the script.
   */
  public JythonScript() {
    super();
  }

  /**
   * Initializes the script.
   * 
   * @param doc the document to use as basis
   */
  public JythonScript(Document doc) {
    super(doc);
  }

  /**
   * Initializes the script. Automatically loads the specified file, if not
   * null.
   * 
   * @param doc the document to use as basis
   * @param file the file to load (if not null)
   */
  public JythonScript(Document doc, File file) {
    super(doc, file);
  }

  /**
   * Returns the extension filters for this type of script.
   * 
   * @return the filters
   */
  @Override
  public ExtensionFileFilter[] getFilters() {
    ExtensionFileFilter[] result;

    result = new ExtensionFileFilter[1];
    result[0] = new ExtensionFileFilter(getDefaultExtension(),
      "Jython script (*" + getDefaultExtension() + ")");

    return result;
  }

  /**
   * Returns the default extension. Gets automatically added to files if their
   * name doesn't end with this.
   * 
   * @return the default extension (incl. the dot)
   */
  @Override
  public String getDefaultExtension() {
    return ".py";
  }

  /**
   * Returns whether scripts can be executed, i.e., Jython is present.
   * 
   * @return true if scripts can be executed
   */
  @Override
  protected boolean canExecuteScripts() {
    return Jython.isPresent();
  }

  /**
   * Performs pre-execution checks.
   * 
   * This method checks whether Jython is available (throws an exception if
   * not).
   * 
   * @param args optional commandline arguments
   * @throws Exception if checks fail
   */
  @Override
  protected void preCheck(String[] args) throws Exception {
    super.preCheck(args);

    if (!Jython.isPresent()) {
      throw new Exception("Jython classes are not present in CLASSPATH!");
    }
  }

  /**
   * Returns a new thread to execute.
   * 
   * @param args optional commandline arguments
   * @return the new thread object
   */
  @Override
  public ScriptThread newThread(String[] args) {
    return new JythonThread(this, args);
  }

  /**
   * Runs the script from commandline. Use "-h" to list all options.
   * 
   * @param args the commandline arguments
   * @throws Exception if execution fails
   */
  public static void main(String[] args) throws Exception {
    runScript(new JythonScript(), args);
  }
}