nashorn/src/jdk.scripting.nashorn.shell/share/classes/jdk/nashorn/tools/jjs/Main.java
8133347: Add makefiles support and basic session, persistence history navigation with jline
Reviewed-by: erikj, jlahoda, jlaskey
/*
* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package jdk.nashorn.tools.jjs;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.prefs.Preferences;
import jdk.nashorn.internal.objects.Global;
import jdk.nashorn.internal.runtime.Context;
import jdk.nashorn.internal.runtime.ErrorManager;
import jdk.nashorn.internal.runtime.JSType;
import jdk.nashorn.internal.runtime.ScriptEnvironment;
import jdk.nashorn.internal.runtime.ScriptRuntime;
import jdk.nashorn.tools.Shell;
import jdk.internal.jline.console.UserInterruptException;
/**
* Interactive command line Shell for Nashorn.
*/
public final class Main extends Shell {
private Main() {}
static final Preferences PREFS = Preferences.userRoot().node("tool/jjs");
/**
* Main entry point with the default input, output and error streams.
*
* @param args The command line arguments
*/
public static void main(final String[] args) {
try {
final int exitCode = main(System.in, System.out, System.err, args);
if (exitCode != SUCCESS) {
System.exit(exitCode);
}
} catch (final IOException e) {
System.err.println(e); //bootstrapping, Context.err may not exist
System.exit(IO_ERROR);
}
}
/**
* Starting point for executing a {@code Shell}. Starts a shell with the
* given arguments and streams and lets it run until exit.
*
* @param in input stream for Shell
* @param out output stream for Shell
* @param err error stream for Shell
* @param args arguments to Shell
*
* @return exit code
*
* @throws IOException if there's a problem setting up the streams
*/
public static int main(final InputStream in, final OutputStream out, final OutputStream err, final String[] args) throws IOException {
return new Main().run(in, out, err, args);
}
/**
* read-eval-print loop for Nashorn shell.
*
* @param context the nashorn context
* @param global global scope object to use
* @return return code
*/
protected int readEvalPrint(final Context context, final Global global) {
final ScriptEnvironment env = context.getEnv();
final String prompt = bundle.getString("shell.prompt");
final PrintWriter err = context.getErr();
final Global oldGlobal = Context.getGlobal();
final boolean globalChanged = (oldGlobal != global);
try (final Console in = new Console(System.in, System.out, PREFS)) {
if (globalChanged) {
Context.setGlobal(global);
}
global.addShellBuiltins();
while (true) {
String source = "";
try {
source = in.readLine(prompt);
} catch (final IOException ioe) {
err.println(ioe.toString());
if (env._dump_on_error) {
ioe.printStackTrace(err);
}
return IO_ERROR;
} catch (final UserInterruptException ex) {
break;
}
if (source.isEmpty()) {
continue;
}
try {
final Object res = context.eval(global, source, global, "<shell>");
if (res != ScriptRuntime.UNDEFINED) {
err.println(JSType.toString(res));
}
} catch (final Exception e) {
err.println(e);
if (env._dump_on_error) {
e.printStackTrace(err);
}
}
}
} catch (final Exception e) {
err.println(e);
if (env._dump_on_error) {
e.printStackTrace(err);
}
} finally {
if (globalChanged) {
Context.setGlobal(oldGlobal);
}
}
return SUCCESS;
}
}