[Laszlo-dev] schema for <handler>

[Jim Grandy]

I'm converting the base components to use <event> and <handler>, and  
ran into something I don't think is quite right.

The proposal (http://wiki.openlaszlo.org/Event_and_handler_tags)  
suggests that <handler> should have two forms:

> <handler name="eventName" [reference="..."] [args="..."]>
>    ...
>  </handler>

and

> <handler name="eventName" [reference="..."] method="methodName" />

But the schema entry looks like this:

> handler =
>   element handler {
>    ( nameAttribute |
>    ( nameAttribute? &
>      ## The name of the method that this handler will call
>      attribute method {string} &
>      ## If this attribute is present, it is a JavaScript expression
>      ## that evaluates to an object.  The code in this method executes
>      ## when this object sends the event named by the @a{event}
>      ## attribute.  This attribute may be present only if
>      ## the @a{event} attribute is present too.
>      [a:defaultValue="this"]
>      attribute reference {reference}?)) &
>     ## The parameter names of this method.  The value of this  
> attribute
>     ## is a comma-separated list of JavaScript identifiers.
>     [a:defaultValue=""
>      lza:modifiers="final"]
>     attribute args {string}? &
>     text
>   }
>

I read this as allowing

<handler name="eventName" [args="..."]> ... </handler>

or

<handler [name="eventName"] method="methodName" [reference="..."]  
[args="..."]> ... </handler>

Whether text is allowed or not (it shouldn't if @method is given) is  
one problem. Another is that I can't write

<handler name="eventName" reference="..." args="..."> ... </handler>

The workaround for the second is (I think) to split the handler  
definition into a handler and a method, but I shouldn't have to do this.

Third, the comment says about @method that "this attribute may be  
present only if the @a{event} attribute is present too," but there's  
no @event attribute in handler. Does this mean to say @name instead  
of @event?

If everyone agrees, I'll propose a change to the schema to fix both  
of these problems. I don't see a unit test file; Henry, did you write  
one when you did the initial implementation?

jim

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