OpenEuphoria

RE: question that might not have an answer

• Posted by Matt Lewis <matthewwalkerlewis at yahoo.com> Jan 12, 2004
• 592 views

Kat wrote:
> 
> 
> On 12 Jan 2004, at 15:11, Matt Lewis wrote:
> 
> > 
> > You might be interested in euscript, which is based on David's 
> > interpreter.  You can get it from my web page:
> > 
> > http://www14.brinkster.com/matthewlewis/projects.html
> > 
> > IIRC, someone (Greg Haberek?) was improving euscript.  To see it > > in 
> > action, you can check out EDB (also on my page).  I use 
> > euscript to allow user defined event handling in database forms.
> 
> Matt, on-the-fly additions, or additions and then shutting down the 
> app and restarting before the new code is runable?

On-the-fly additions.  euscript is just David Cuny's eu.ex reworked into 
an include file.  In fact, you can have multiple, compartmentalized 
scripts.

In order for it to meaningfully work with your application, you need to 
provide an API into your code (calling functions, changing data, etc).  
Basically, you provide a routine name, type (function or procedure), the 
number of arguments and a routine id, and then it's visible to your 
script.  Changing variables must be handled indirectly (i.e., you need 
to provide get/set routines to handle this).

The code isn't as robust as it could be.  Your application could crash 
after some script errors.  For instance, there is no typechecking of 
arguments when calling an external function.  Part of the reason for 
this is that it wasn't implemented by David (or Delroy, who took it over 
at one point) and I don't understand how it all works well enough to do 
this.

Matt Lewis