com.github.mcheely.maven.requirejs.RhinoRunner Maven / Gradle / Ivy
/* ***** 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
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package com.github.mcheely.maven.requirejs;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Map;
import org.codehaus.plexus.util.IOUtil;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.ErrorReporter;
import org.mozilla.javascript.EvaluatorException;
import org.mozilla.javascript.Function;
import org.mozilla.javascript.JavaScriptException;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.ScriptableObject;
import org.mozilla.javascript.WrappedException;
/**
* The BasicRhinoShell program.
*
* Can execute scripts interactively or in batch mode at the command line. An
* example of controlling the JavaScript engine.
*
* @author Norris Boyd
* @author Matthew Cheely
*/
public class RhinoRunner extends ScriptableObject {
private static final long serialVersionUID = 3859222870741981547L;
@Override
public String getClassName() {
return "global";
}
/**
* Execute a js file.
* @param includes other js files to include and parse before executing the main script.
* @param mainScript the script to run.
* @param args arguments that will be visible to the script.
* @param globalVariables global js variables to set.
* @param reporter error reporter.
*/
public static void exec(File[] includes, File mainScript, Object[] args, Map globalVariables, ErrorReporter reporter) {
// Associate a new Context with this thread
Context cx = Context.enter();
cx.setErrorReporter(reporter);
try {
// Initialize the standard objects (Object, Function, etc.)
// This must be done before scripts can be executed.
RhinoRunner runner = new RhinoRunner();
cx.initStandardObjects(runner);
// Define some global functions particular to the BasicRhinoShell.
// Note
// that these functions are not part of ECMA.
String[] names = { "print", "load", "readFile", "warn", "getResourceAsStream" };
runner.defineFunctionProperties(names, RhinoRunner.class, ScriptableObject.DONTENUM);
for (File include : includes) {
runner.processSource(cx, include);
}
// 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;
array = new Object[length];
System.arraycopy(args, 0, array, 0, length);
}
Scriptable argsObj = cx.newArray(runner, array);
runner.defineProperty("arguments", argsObj, ScriptableObject.DONTENUM);
for (String key : globalVariables.keySet()) {
runner.defineProperty(key, globalVariables.get(key), ScriptableObject.DONTENUM);
}
runner.processSource(cx, mainScript);
} finally {
Context.exit();
}
}
/**
* 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.
*
* @param cx the js execution context
* @param thisObj ?
* @param args ?
* @param funObj ?
*/
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();
}
/**
* Report a warning.
*
* @param cx the js execution context
* @param thisObj ?
* @param args ?
* @param funObj ?
*/
public static void warn(Context cx, Scriptable thisObj, Object[] args, Function funObj) {
String message = Context.toString(args[ 0 ]);
int line = (int) Context.toNumber(args[ 1 ]);
String source = Context.toString(args[ 2 ]);
int column = (int) Context.toNumber(args[ 3 ]);
cx.getErrorReporter().warning(message, null, line, source, column);
}
/**
* Read a file from a path. Exposed to js execution environment.
*
* @param path the path to the file to be read
* @return the contents of the file as a string
*/
public String readFile(String path) {
try {
InputStream inputStream;
File file = new File(path);
if (file.exists()) {
inputStream = new FileInputStream(path);
} else {
inputStream = getClass().getClassLoader().getResourceAsStream(path);
}
return IOUtil.toString(inputStream);
} catch (IOException exc) {
throw new RuntimeException("wrap: " + exc.getMessage(), exc);
}
}
/**
* Load and execute a set of JavaScript source files.
*This method is exposed to js execution environment.
*
* @param cx the js execution context
* @param thisObj ?
* @param args ?
* @param funObj ?
*/
public static void load(Context cx, Scriptable thisObj, Object[] args, Function funObj) {
RhinoRunner runner = (RhinoRunner) getTopLevelScope(thisObj);
for (Object element : args) {
runner.processSource(cx, Context.toString(element));
}
}
/**
* Get a classpath resource as an input stream. Exposed to js environment?
* @param path the path to the resource
* @return an input stream for the resource
*/
public InputStream getResourceAsStream(String path) {
File file = new File(path);
if (file.exists()) {
try {
return new FileInputStream(path);
} catch (FileNotFoundException e) {
throw new RuntimeException(e);
}
} else {
return getClass().getClassLoader().getResourceAsStream(path);
}
}
private void processSource(Context cx, String path) {
String filename = path;
File file = new File(filename);
if (file.exists()) {
processSource(cx, file);
} else {
if (filename.startsWith(".")) {
filename = filename.substring(1);
}
if (!filename.startsWith("/")) {
filename = "/" + filename;
}
InputStreamReader in = new InputStreamReader(getClass().getResourceAsStream(filename));
processSource(cx, in, filename);
}
}
private void processSource(Context cx, File file) {
if (file != null) {
String filename = file.getAbsolutePath();
InputStreamReader in = null;
try {
in = new FileReader(file);
} catch (FileNotFoundException ex) {
Context.reportError("Couldn't open file \"" + filename + "\".");
return;
}
processSource(cx, in, filename);
}
}
private void processSource(Context cx, InputStreamReader in, String filename) {
try {
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());
}
}
}
}
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