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+/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ *
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (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.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Rhino code, released
+ * May 6, 1998.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1997-1999
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * the GNU General Public License Version 2 or later (the "GPL"), in which
+ * case the provisions of the GPL are applicable instead of those above. If
+ * you wish to allow use of your version of this file only under the terms of
+ * the GPL and not to allow others to use your version of this file under the
+ * MPL, indicate your decision by deleting the provisions above and replacing
+ * them with the notice and other provisions required by the GPL. If you do
+ * not delete the provisions above, a recipient may use your version of this
+ * file under either the MPL or the GPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+import org.mozilla.javascript.*;
+import java.io.*;
+
+/**
+ * The shell program.
+ *
+ * Can execute scripts interactively or in batch mode at the command line.
+ * An example of controlling the JavaScript engine.
+ *
+ * @author Norris Boyd
+ */
+public class Shell extends ScriptableObject
+{
+ public String getClassName()
+ {
+ return "global";
+ }
+
+ /**
+ * Main entry point.
+ *
+ * Process arguments as would a normal Java program. Also
+ * create a new Context and associate it with the current thread.
+ * Then set up the execution environment and begin to
+ * execute scripts.
+ */
+ public static void main(String args[]) {
+ // Associate a new Context with this thread
+ Context cx = Context.enter();
+ try {
+ // Initialize the standard objects (Object, Function, etc.)
+ // This must be done before scripts can be executed.
+ Shell shell = new Shell();
+ cx.initStandardObjects(shell);
+
+ // Define some global functions particular to the shell. Note
+ // that these functions are not part of ECMA.
+ String[] names = { "print", "quit", "version", "load", "help" };
+ shell.defineFunctionProperties(names, Shell.class,
+ ScriptableObject.DONTENUM);
+
+ args = processOptions(cx, args);
+
+ // Set up "arguments" in the global scope to contain the command
+ // line arguments after the name of the script to execute
+ Object[] array;
+ if (args.length == 0) {
+ array = new Object[0];
+ } else {
+ int length = args.length - 1;
+ array = new Object[length];
+ System.arraycopy(args, 1, array, 0, length);
+ }
+ Scriptable argsObj = cx.newArray(shell, array);
+ shell.defineProperty("arguments", argsObj,
+ ScriptableObject.DONTENUM);
+
+ shell.processSource(cx, args.length == 0 ? null : args[0]);
+ } finally {
+ Context.exit();
+ }
+ }
+
+ /**
+ * Parse arguments.
+ */
+ public static String[] processOptions(Context cx, String args[]) {
+ for (int i=0; i < args.length; i++) {
+ String arg = args[i];
+ if (!arg.startsWith("-")) {
+ String[] result = new String[args.length - i];
+ for (int j=i; j < args.length; j++)
+ result[j-i] = args[j];
+ return result;
+ }
+ if (arg.equals("-version")) {
+ if (++i == args.length)
+ usage(arg);
+ double d = Context.toNumber(args[i]);
+ if (d != d)
+ usage(arg);
+ cx.setLanguageVersion((int) d);
+ continue;
+ }
+ usage(arg);
+ }
+ return new String[0];
+ }
+
+ /**
+ * Print a usage message.
+ */
+ private static void usage(String s) {
+ p("Didn't understand \"" + s + "\".");
+ p("Valid arguments are:");
+ p("-version 100|110|120|130|140|150|160|170");
+ System.exit(1);
+ }
+
+ /**
+ * Print a help message.
+ *
+ * This method is defined as a JavaScript function.
+ */
+ public void help() {
+ p("");
+ p("Command Description");
+ p("======= ===========");
+ p("help() Display usage and help messages. ");
+ p("defineClass(className) Define an extension using the Java class");
+ p(" named with the string argument. ");
+ p(" Uses ScriptableObject.defineClass(). ");
+ p("load(['foo.js', ...]) Load JavaScript source files named by ");
+ p(" string arguments. ");
+ p("loadClass(className) Load a class named by a string argument.");
+ p(" The class must be a script compiled to a");
+ p(" class file. ");
+ p("print([expr ...]) Evaluate and print expressions. ");
+ p("quit() Quit the shell. ");
+ p("version([number]) Get or set the JavaScript version number.");
+ p("");
+ }
+
+ /**
+ * Print the string values of its arguments.
+ *
+ * This method is defined as a JavaScript function.
+ * Note that its arguments are of the "varargs" form, which
+ * allows it to handle an arbitrary number of arguments
+ * supplied to the JavaScript function.
+ *
+ */
+ public static void print(Context cx, Scriptable thisObj,
+ Object[] args, Function funObj)
+ {
+ for (int i=0; i < args.length; i++) {
+ if (i > 0)
+ System.out.print(" ");
+
+ // Convert the arbitrary JavaScript value into a string form.
+ String s = Context.toString(args[i]);
+
+ System.out.print(s);
+ }
+ System.out.println();
+ }
+
+ /**
+ * Quit the shell.
+ *
+ * This only affects the interactive mode.
+ *
+ * This method is defined as a JavaScript function.
+ */
+ public void quit()
+ {
+ quitting = true;
+ }
+
+ /**
+ * Get and set the language version.
+ *
+ * This method is defined as a JavaScript function.
+ */
+ public static double version(Context cx, Scriptable thisObj,
+ Object[] args, Function funObj)
+ {
+ double result = cx.getLanguageVersion();
+ if (args.length > 0) {
+ double d = Context.toNumber(args[0]);
+ cx.setLanguageVersion((int) d);
+ }
+ return result;
+ }
+
+ /**
+ * Load and execute a set of JavaScript source files.
+ *
+ * This method is defined as a JavaScript function.
+ *
+ */
+ public static void load(Context cx, Scriptable thisObj,
+ Object[] args, Function funObj)
+ {
+ Shell shell = (Shell)getTopLevelScope(thisObj);
+ for (int i = 0; i < args.length; i++) {
+ shell.processSource(cx, Context.toString(args[i]));
+ }
+ }
+
+
+ /**
+ * Evaluate JavaScript source.
+ *
+ * @param cx the current context
+ * @param filename the name of the file to compile, or null
+ * for interactive mode.
+ */
+ private void processSource(Context cx, String filename)
+ {
+ if (filename == null) {
+ BufferedReader in = new BufferedReader
+ (new InputStreamReader(System.in));
+ String sourceName = "<stdin>";
+ int lineno = 1;
+ boolean hitEOF = false;
+ do {
+ int startline = lineno;
+ System.err.print("js> ");
+ System.err.flush();
+ try {
+ String source = "";
+ // Collect lines of source to compile.
+ while(true) {
+ String newline;
+ newline = in.readLine();
+ if (newline == null) {
+ hitEOF = true;
+ break;
+ }
+ source = source + newline + "\n";
+ lineno++;
+ // Continue collecting as long as more lines
+ // are needed to complete the current
+ // statement. stringIsCompilableUnit is also
+ // true if the source statement will result in
+ // any error other than one that might be
+ // resolved by appending more source.
+ if (cx.stringIsCompilableUnit(source))
+ break;
+ }
+ Object result = cx.evaluateString(this, source,
+ sourceName, startline,
+ null);
+ if (result != Context.getUndefinedValue()) {
+ System.err.println(Context.toString(result));
+ }
+ }
+ catch (WrappedException we) {
+ // Some form of exception was caught by JavaScript and
+ // propagated up.
+ System.err.println(we.getWrappedException().toString());
+ we.printStackTrace();
+ }
+ catch (EvaluatorException ee) {
+ // Some form of JavaScript error.
+ System.err.println("js: " + ee.getMessage());
+ }
+ catch (JavaScriptException jse) {
+ // Some form of JavaScript error.
+ System.err.println("js: " + jse.getMessage());
+ }
+ catch (IOException ioe) {
+ System.err.println(ioe.toString());
+ }
+ if (quitting) {
+ // The user executed the quit() function.
+ break;
+ }
+ } while (!hitEOF);
+ System.err.println();
+ } else {
+ FileReader in = null;
+ try {
+ in = new FileReader(filename);
+ }
+ catch (FileNotFoundException ex) {
+ Context.reportError("Couldn't open file \"" + filename + "\".");
+ return;
+ }
+
+ try {
+ // Here we evalute the entire contents of the file as
+ // a script. Text is printed only if the print() function
+ // is called.
+ cx.evaluateReader(this, in, filename, 1, null);
+ }
+ catch (WrappedException we) {
+ System.err.println(we.getWrappedException().toString());
+ we.printStackTrace();
+ }
+ catch (EvaluatorException ee) {
+ System.err.println("js: " + ee.getMessage());
+ }
+ catch (JavaScriptException jse) {
+ System.err.println("js: " + jse.getMessage());
+ }
+ catch (IOException ioe) {
+ System.err.println(ioe.toString());
+ }
+ finally {
+ try {
+ in.close();
+ }
+ catch (IOException ioe) {
+ System.err.println(ioe.toString());
+ }
+ }
+ }
+ }
+
+ private static void p(String s) {
+ System.out.println(s);
+ }
+
+ private boolean quitting;
+}
+
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