Re: parsing EXPRESS (ISO 10303-11)

Ingo Wichmann schrieb:

> ## The next rule does not match correclty:
> unique_clause:    'UNIQUE' ( unique_rule ';' )(s)
> unique_rule:    ( label ':' )(?) referenced_attribute ( ',' 
> referenced_attribute )(s?)
> referenced_attribute:
>         attribute_ref | qualified_attribute

The problem was, that the unique_clause matched to much. It matches the 
following keyword 'ENTITY'. And in contrary to what *,+ and friends in 
regexes do, there is no backtracking to get the keyword back in order 
for the super-role to match. So the superrule fails because of a 
sub-subrule having eaten to much. Sounds like politics.

I will have to tell the indenifier-rule not to match some keywords.

Ingo