beanshell.java

用java 编写的源码开放的文本编辑器。有很多有用的特性

/*
 * BeanShell.java - BeanShell scripting support
 * :tabSize=8:indentSize=8:noTabs=false:
 * :folding=explicit:collapseFolds=1:
 *
 * Copyright (C) 2000, 2001, 2002 Slava Pestov
 *
 * 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 2
 * of the License, or 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

package org.gjt.sp.jedit;

//{{{ Imports
import bsh.*;
import java.lang.reflect.InvocationTargetException;
import java.io.*;
import org.gjt.sp.jedit.io.*;
import org.gjt.sp.jedit.gui.BeanShellErrorDialog;
import org.gjt.sp.jedit.textarea.*;
import org.gjt.sp.util.Log;
//}}}

/**
 * BeanShell is jEdit's extension language.<p>
 *
 * When run from jEdit, BeanShell code has access to the following predefined
 * variables:
 *
 * <ul>
 * <li><code>view</code> - the currently active {@link View}.</li>
 * <li><code>editPane</code> - the currently active {@link EditPane}.</li>
 * <li><code>textArea</code> - the edit pane's {@link JEditTextArea}.</li>
 * <li><code>buffer</code> - the edit pane's {@link Buffer}.</li>
 * <li><code>scriptPath</code> - the path name of the currently executing
 * BeanShell script.</li>
 * </ul>
 *
 * @author Slava Pestov
 * @version $Id: BeanShell.java,v 1.31 2003/02/15 22:17:55 spestov Exp $
 */
public class BeanShell
{
	//{{{ evalSelection() method
	/**
	 * Evaluates the text selected in the specified text area.
	 * @since jEdit 2.7pre2
	 */
	public static void evalSelection(View view, JEditTextArea textArea)
	{
		String command = textArea.getSelectedText();
		if(command == null)
		{
			view.getToolkit().beep();
			return;
		}
		Object returnValue = eval(view,global,command);
		if(returnValue != null)
			textArea.setSelectedText(returnValue.toString());
	} //}}}

	//{{{ showEvaluateDialog() method
	/**
	 * Prompts for a BeanShell expression to evaluate.
	 * @since jEdit 2.7pre2
	 */
	public static void showEvaluateDialog(View view)
	{
		String command = GUIUtilities.input(view,"beanshell-eval-input",null);
		if(command != null)
		{
			if(!command.endsWith(";"))
				command = command + ";";

			int repeat = view.getInputHandler().getRepeatCount();

			if(view.getMacroRecorder() != null)
			{
				view.getMacroRecorder().record(repeat,command);
			}

			Object returnValue = null;
			try
			{
				for(int i = 0; i < repeat; i++)
				{
					returnValue = _eval(view,global,command);
				}
			}
			catch(Throwable e)
			{
				Log.log(Log.ERROR,BeanShell.class,e);

				handleException(view,null,e);
			}

			if(returnValue != null)
			{
				String[] args = { returnValue.toString() };
				GUIUtilities.message(view,"beanshell-eval",args);
			}
		}
	} //}}}

	//{{{ showEvaluateLinesDialog() method
	/**
	 * Evaluates the specified script for each selected line.
	 * @since jEdit 4.0pre1
	 */
	public static void showEvaluateLinesDialog(View view)
	{
		String command = GUIUtilities.input(view,"beanshell-eval-line",null);

		JEditTextArea textArea = view.getTextArea();
		Buffer buffer = view.getBuffer();

		if(command == null || command.length() == 0)
			return;

		Selection[] selection = textArea.getSelection();
		if(selection.length == 0)
		{
			view.getToolkit().beep();
			return;
		}

		if(!command.endsWith(";"))
			command = command + ";";

		if(view.getMacroRecorder() != null)
			view.getMacroRecorder().record(1,command);

		try
		{
			buffer.beginCompoundEdit();

			for(int i = 0; i < selection.length; i++)
			{
				Selection s = selection[i];
				for(int j = s.getStartLine(); j <= s.getEndLine(); j++)
				{
					// if selection ends on the start of a
					// line, don't filter that line
					if(s.getEnd() == textArea.getLineStartOffset(j))
						break;

					global.setVariable("line",new Integer(j));
					global.setVariable("index",new Integer(
						j - s.getStartLine()));
					int start = s.getStart(buffer,j);
					int end = s.getEnd(buffer,j);
					String text = buffer.getText(start,
						end - start);
					global.setVariable("text",text);

					Object returnValue = _eval(view,global,command);
					if(returnValue != null)
					{
						buffer.remove(start,end - start);
						buffer.insert(start,
							returnValue.toString());
					}
				}
			}
		}
		catch(Throwable e)
		{
			Log.log(Log.ERROR,BeanShell.class,e);

			handleException(view,null,e);
		}
		finally
		{
			buffer.endCompoundEdit();
		}

		textArea.selectNone();
	} //}}}

	//{{{ runScript() method
	/**
	 * Runs a BeanShell script. Errors are shown in a dialog box.<p>
	 *
	 * If the <code>in</code> parameter is non-null, the script is
	 * read from that stream; otherwise it is read from the file identified
	 * by <code>path</code>.<p>
	 *
	 * The <code>scriptPath</code> BeanShell variable is set to the path
	 * name of the script.
	 *
	 * @param view The view. Within the script, references to
	 * <code>buffer</code>, <code>textArea</code> and <code>editPane</code>
	 * are determined with reference to this parameter.
	 * @param path The script file's VFS path.
	 * @param in The reader to read the script from, or <code>null</code>.
	 * @param ownNamespace If set to <code>false</code>, methods and
	 * variables defined in the script will be available to all future
	 * uses of BeanShell; if set to <code>true</code>, they will be lost as
	 * soon as the script finishes executing. jEdit uses a value of
	 * <code>false</code> when running startup scripts, and a value of
	 * <code>true</code> when running all other macros.
	 *
	 * @since jEdit 4.0pre7
	 */
	public static void runScript(View view, String path, Reader in,
		boolean ownNamespace)
	{
		try
		{
			_runScript(view,path,in,ownNamespace);
		}
		catch(Throwable e)
		{
			Log.log(Log.ERROR,BeanShell.class,e);

			handleException(view,path,e);
		}
	} //}}}

	//{{{ _runScript() method
	/**
	 * Runs a BeanShell script. Errors are passed to the caller.<p>
	 *
	 * If the <code>in</code> parameter is non-null, the script is
	 * read from that stream; otherwise it is read from the file identified
	 * by <code>path</code>.<p>
	 *
	 * The <code>scriptPath</code> BeanShell variable is set to the path
	 * name of the script.
	 *
	 * @param view The view. Within the script, references to
	 * <code>buffer</code>, <code>textArea</code> and <code>editPane</code>
	 * are determined with reference to this parameter.
	 * @param path The script file's VFS path.
	 * @param in The reader to read the script from, or <code>null</code>.
	 * @param ownNamespace If set to <code>false</code>, methods and
	 * variables defined in the script will be available to all future
	 * uses of BeanShell; if set to <code>true</code>, they will be lost as
	 * soon as the script finishes executing. jEdit uses a value of
	 * <code>false</code> when running startup scripts, and a value of
	 * <code>true</code> when running all other macros.
	 * @exception Exception instances are thrown when various BeanShell errors
	 * occur
	 * @since jEdit 4.0pre7
	 */
	public static void _runScript(View view, String path, Reader in,
		boolean ownNamespace) throws Exception
	{
		Log.log(Log.MESSAGE,BeanShell.class,"Running script " + path);

		NameSpace namespace;
		if(ownNamespace)
			namespace = new NameSpace(global,"script namespace");
		else
			namespace = global;

		Interpreter interp = createInterpreter(namespace);

		VFS vfs = null;
		Object session = null;

		try
		{
			if(in == null)
			{
				Buffer buffer = jEdit.getBuffer(path);

				vfs = VFSManager.getVFSForPath(path);
				session = vfs.createVFSSession(path,view);
				if(session == null)
				{
					// user cancelled???
					return;
				}

				if(buffer != null)
				{
					if(!buffer.isLoaded())
						VFSManager.waitForRequests();

					in = new StringReader(buffer.getText(0,
						buffer.getLength()));
				}
				else
				{
					in = new BufferedReader(new InputStreamReader(
						vfs._createInputStream(session,
						path,false,view)));
				}
			}

			if(view != null)
			{
				interp.set("view",view);
				EditPane editPane = view.getEditPane();
				interp.set("editPane",editPane);
				interp.set("buffer",editPane.getBuffer());
				interp.set("textArea",editPane.getTextArea());
			}

			interp.set("scriptPath",path);

			running = true;

			interp.eval(in,namespace,path);
		}
		catch(Exception e)
		{
			unwrapException(e);
		}
		finally
		{
			running = false;

			if(session != null)
			{
				try
				{
					vfs._endVFSSession(session,view);
				}
				catch(IOException io)
				{
					Log.log(Log.ERROR,BeanShell.class,io);
					GUIUtilities.error(view,"read-error",
						new String[] { path, io.toString() });
				}
			}

			try
			{
				// no need to do this for macros!
				if(!ownNamespace)
				{
					if(view != null)
					{
						interp.unset("view");
						interp.unset("editPane");
						interp.unset("buffer");
						interp.unset("textArea");
					}

					interp.unset("scriptPath");
				}