зеркало из https://github.com/mozilla/pjs.git
353 строки
12 KiB
Java
353 строки
12 KiB
Java
/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
|
|
*
|
|
* The contents of this file are subject to the Netscape 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/NPL/
|
|
*
|
|
* 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 Netscape are
|
|
* Copyright (C) 1997-1999 Netscape Communications Corporation. All
|
|
* Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
*
|
|
* Alternatively, the contents of this file may be used under the
|
|
* terms of the GNU Public License (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 NPL, indicate your decision by
|
|
* deleting the provisions above and replace 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 NPL or the GPL.
|
|
*/
|
|
|
|
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 {
|
|
|
|
/**
|
|
* 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();
|
|
|
|
// A bit of shorthand: since Shell extends ScriptableObject,
|
|
// we can make it the global object.
|
|
global = new Shell();
|
|
|
|
// Initialize the standard objects (Object, Function, etc.)
|
|
// This must be done before scripts can be executed.
|
|
cx.initStandardObjects(global);
|
|
|
|
// Define some global functions particular to the shell. Note
|
|
// that these functions are not part of ECMA.
|
|
String[] names = { "print", "quit", "version", "load", "help" };
|
|
try {
|
|
global.defineFunctionProperties(names, Shell.class,
|
|
ScriptableObject.DONTENUM);
|
|
} catch (PropertyException e) {
|
|
throw new Error(e.getMessage());
|
|
}
|
|
|
|
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 = args;
|
|
if (args.length > 0) {
|
|
int length = args.length - 1;
|
|
array = new Object[length];
|
|
System.arraycopy(args, 1, array, 0, length);
|
|
}
|
|
Scriptable argsObj = cx.newArray(global, array);
|
|
global.defineProperty("arguments", argsObj,
|
|
ScriptableObject.DONTENUM);
|
|
|
|
processSource(cx, args.length == 0 ? null : args[0]);
|
|
|
|
cx.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 = cx.toNumber(args[i]);
|
|
if (d != d)
|
|
usage(arg);
|
|
cx.setLanguageVersion((int) d);
|
|
continue;
|
|
}
|
|
usage(arg);
|
|
}
|
|
return new String[0];
|
|
}
|
|
|
|
/**
|
|
* Return name of this class, the global object.
|
|
*
|
|
* This method must be implemented in all concrete classes
|
|
* extending ScriptableObject.
|
|
*
|
|
* @see org.mozilla.javascript.Scriptable#getClassName
|
|
*/
|
|
public String getClassName() {
|
|
return "global";
|
|
}
|
|
|
|
/**
|
|
* Print a usage message.
|
|
*/
|
|
public static void usage(String s) {
|
|
p("Didn't understand \"" + s + "\".");
|
|
p("Valid arguments are:");
|
|
p("-version 100|110|120|130");
|
|
System.exit(1);
|
|
}
|
|
|
|
/**
|
|
* Print a help message.
|
|
*
|
|
* This method is defined as a JavaScript function.
|
|
*/
|
|
public static void help(String s) {
|
|
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 static 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 = (double) cx.getLanguageVersion();
|
|
if (args.length > 0) {
|
|
double d = cx.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)
|
|
{
|
|
for (int i=0; i < args.length; i++) {
|
|
processSource(cx, cx.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.
|
|
*/
|
|
public static 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(global, source,
|
|
sourceName, startline,
|
|
null);
|
|
if (result != cx.getUndefinedValue()) {
|
|
System.err.println(cx.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(global, 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());
|
|
}
|
|
}
|
|
}
|
|
System.gc();
|
|
}
|
|
|
|
private static void p(String s) {
|
|
System.out.println(s);
|
|
}
|
|
|
|
static Shell global;
|
|
static boolean quitting;
|
|
}
|
|
|