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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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