Re: [PMCMS-discuss] MP4H with entity support

[Denis B. <ba...@im...>]

On Fri, Sep 28, 2001 at 02:39:57PM +0200, Anders Dinsen wrote:
> Hi Denis
> 
> I've begun adding support for user defined entities to MP4H, i.e. argument
> less macros that are invoked with &macro-name; To do it, I've changed the
> parser and added a new builtin <define-entity>...</define-entity> similar
> to define-tag. There's also a new symbol table for entities.

Hi Anders,

nice, this is exactly the name I chose too ;)

> It works mostly, but evaluates the body of the define-entity builtin too
> early. I cannot track the problem. Can you help me.
> 
> I've attached a patch, that can be applied against mp4h-1.2.0.
> Try ``make test'' and watch the second entity test fail.

Right, I'll have a look tonight.

> <define-entity foo>hello</define-entity>
> <define-entity bar>&foo;</define-entity>&bar;
> <define-entity foo>hello world</define-entity>&bar;

There is indeed a problem here, you have to disable entity expansion
when defining macros.  Maybe the simplest solution is to transform
&foo; by <%foo%/> (or any other special name) in expand_user_macro, it
should then be expanded as you want.

BTW I do not remember rules about entity expansion, are you sure that
the latter definition overrides the formers?

Denis