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Control.java
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72 lines (58 loc) · 2.54 KB
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/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
import org.mozilla.javascript.Context;
import org.mozilla.javascript.Function;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.ScriptableObject;
/**
* Example of controlling the JavaScript execution engine.
*
* We evaluate a script and then manipulate the result.
*
*/
public class Control {
/**
* 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)
{
Context cx = Context.enter();
try {
// Set version to JavaScript1.2 so that we get object-literal style
// printing instead of "[object Object]"
cx.setLanguageVersion(Context.VERSION_1_2);
// Initialize the standard objects (Object, Function, etc.)
// This must be done before scripts can be executed.
Scriptable scope = cx.initStandardObjects();
// Now we can evaluate a script. Let's create a new object
// using the object literal notation.
Object result = cx.evaluateString(scope, "obj = {a:1, b:['x','y']}",
"MySource", 1, null);
Scriptable obj = (Scriptable) scope.get("obj", scope);
// Should print "obj == result" (Since the result of an assignment
// expression is the value that was assigned)
System.out.println("obj " + (obj == result ? "==" : "!=") +
" result");
// Should print "obj.a == 1"
System.out.println("obj.a == " + obj.get("a", obj));
Scriptable b = (Scriptable) obj.get("b", obj);
// Should print "obj.b[0] == x"
System.out.println("obj.b[0] == " + b.get(0, b));
// Should print "obj.b[1] == y"
System.out.println("obj.b[1] == " + b.get(1, b));
// Should print {a:1, b:["x", "y"]}
Function fn = (Function) ScriptableObject.getProperty(obj, "toString");
System.out.println(fn.call(cx, scope, obj, new Object[0]));
} finally {
Context.exit();
}
}
}