New nsIScriptable interface: Difference between revisions

    // A new helper xpcom service for cross-language work.

    [scriptable, uuid(...)]

    interface nsIDOMScriptObjectHelper: nsISupports

    {

        // Compile a function using the specified language.  Returns

        // an nsIScriptable that can be directly called (ie, by passing

        // DISPID_DEFAULT).  |glob| must be the global window in

        // which the returned function will execute when called.

        // Generally you pass |this|.

        nsIScriptable compileFunction(in nsISupports glob,

                                      in PRUint32 langID,  

                                      in DOMString aCode,  

                                      [array] in DOMString argNames);

        // Execute arbitrary code.

        void execute(PRUint32 langID, in DOMString aCode);

        // Takes a script-type ID (which is presumably the ID for

        // a language other than the one being executed), and nsISupports  

        // |glob| (which must be the global object for the currently

        // executing language) and returns an nsIScriptable, which is  

        // the namespace for the requested language.

        nsIScriptable getLanguageGlobal(in PRUint32 aRequestedLanguage, in nsISupports glob);

    };

    var lang_id = node.scriptTypeID; // new attribute on nsIDOMNSEventTarget.

    var s = components.classes["@mozilla.org/scriptobjectfactory"].getService();

    var func = s.compileFunction(this, lang_id, handler, "event");

    // |func| is an nsIScriptable - call it.

    var returned = func(event)