/*
* $Id$
*
* Copyright (C) 2003-2014 JNode.org
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; If not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package org.jnode.shell.command.bsh;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintStream;
import org.jnode.shell.AbstractCommand;
import org.jnode.shell.syntax.Argument;
import org.jnode.shell.syntax.FileArgument;
import org.jnode.shell.syntax.FlagArgument;
import org.jnode.shell.syntax.StringArgument;
import bsh.Interpreter;
/**
* @author Levente S\u00e1ntha
* @author crawley@jnode.org
*/
public class BshCommand extends AbstractCommand {
private final StringArgument ARG_CODE =
new StringArgument("code", Argument.OPTIONAL, "a BeanShell code snippet to execute");
private final FileArgument ARG_FILE =
new FileArgument("file", Argument.OPTIONAL, "a BeanShell script file to execute");
private final FlagArgument FLAG_INTERACTIVE =
new FlagArgument("interactive", Argument.OPTIONAL, "go interactive");
public BshCommand() {
super("run the BeanShell interpreter");
registerArguments(ARG_CODE, ARG_FILE, FLAG_INTERACTIVE);
}
public static void main(String[] args) throws Exception {
new BshCommand().execute(args);
}
public void execute() throws Exception {
Interpreter bsh = null;
Object ret;
boolean interactive = false;
InputStream in = getInput().getInputStream();
OutputStream out = getOutput().getOutputStream();
OutputStream err = getError().getOutputStream();
if (FLAG_INTERACTIVE.isSet()) {
bsh = createInterpreter(in, out, err, true);
interactive = true;
}
if (ARG_CODE.isSet()) {
if (bsh == null) {
bsh = createInterpreter(in, out, err, false);
}
String code = ARG_CODE.getValue();
ret = bsh.eval(code);
if (ret != null) {
out.write((ret + "\n").getBytes());
}
}
if (ARG_FILE.isSet()) {
if (bsh == null) {
bsh = createInterpreter(in, out, err, false);
}
String file = ARG_FILE.getValue().toString();
ret = bsh.source(file);
if (ret != null) {
out.write((ret + "\n").getBytes());
}
}
out.flush();
if (bsh == null) {
// If no arguments were given, default to interactive mode.
bsh = createInterpreter(in, out, err, true);
interactive = true;
}
if (interactive) {
bsh.run();
}
}
private Interpreter createInterpreter(
InputStream in, OutputStream out, OutputStream err, boolean interactive)
throws Exception {
Interpreter interpreter = new Interpreter(
new BufferedReader(new InputStreamReader(in)),
new PrintStream(out),
new PrintStream(err), interactive);
if (interactive) {
interpreter.eval("show();");
}
return interpreter;
}
}