JavaScript (Rhino) use library or include other scripts

Question

In JDK6, is there a way to load multiple scripts, each in a file, and have the one script reference a method of another script? Sort of like \"include\"?

Answer 1

A real-life example this time, i.e. running the esprima parser with Rhino 1.7R4.

import org.mozilla.javascript.Context;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.ScriptableObject;
...

Context context = Context.enter();
Scriptable globalScope = context.initStandardObjects();
Reader esprimaLibReader = new InputStreamReader(getClass().getResourceAsStream("/esprima.js"));
context.evaluateReader(globalScope, esprimaLibReader, "esprima.js", 1, null);

// Add a global variable out that is a JavaScript reflection of the System.out variable:
Object wrappedOut = Context.javaToJS(System.out, globalScope);
ScriptableObject.putProperty(globalScope, "out", wrappedOut);

String code = "var syntax = esprima.parse('42');" +
    "out.print(JSON.stringify(syntax, null, 2));";

// The module esprima is available as a global object due to the same
// scope object passed for evaluation:
context.evaluateString(globalScope, code, "", 1, null);
Context.exit();

After running this code, you should see the output as follows:

{
  "type": "Program",
  "body": [
    {
      "type": "ExpressionStatement",
      "expression": {
        "type": "Literal",
        "value": 42,
        "raw": "42"
      }
    }
  ]
}

So indeed, the trick is in reusing the globalScope object.