[PMCMS-discuss] MP4H with entity support

[Anders D. <an...@di...>]

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.

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.

It fails because the following input to mp4h

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

should produce:

hello
hello world

but produces:

hello
hello

The trouble seems to be that the body of the define entity macro is
evaluated at the time the entity is defined, which is too early. It should
not be evaluated until the macro is evaluated. That's the way define-tag
works.

Can you spot the obvious problem with my code?

- Anders

-- 
Anders Dinsen
an...@di...
http://dinsen.net/anders/