/*

     File: Functions.m 

 Abstract: Function callback installed

 in the Controller's JavaScriptCore context.   

  Version: 1.1 

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 */

#import <Cocoa/Cocoa.h>

#import "Functions.h"

#import "NSStringExtras.h"

    /* JavaScriptCore function callback that implements an alert

    displaying mechanism.  This function uses the NSAlert class to

    display a message in a modal dialog. The message stays on the

    screen until the user clicks the okay button.  This callback

    function is installed in the Controller's JavaScriptCore context

    as the messagebox() function that can be called from JavaScripts

    running in the startup script.  */

JSValueRef MessagBoxFunction( JSContextRef ctx, JSObjectRef function, 

                JSObjectRef thisObject, size_t argumentCount,

                const JSValueRef arguments[], JSValueRef *exception ) {

        /* if there is at least one argument... */

    if ( argumentCount >= 1 ) {

            /* Convert the first parameter into a NSString */

        NSString *theMessage = [NSString stringWithJSValue:arguments[0] fromContext: ctx];

            /* if there is a message, display it */

        if ( theMessage != NULL ) {

            [[NSAlert alertWithMessageText:@"JavaScript Alert"

                defaultButton:@"OK" alternateButton:nil otherButton:nil

                    informativeTextWithFormat: @"%@", theMessage] runModal];

        }

    }

        /* return null to javascript */

    return JSValueMakeNull( ctx );

}