Re: question on directive <commit> and subrules

Thanks guys.  I like your idea Marcel.  That seems to
be the cleanest way to propagate a failure up after a
<commit> on a subrule.

Dave MC

--- Marcel Grunauer <[email protected]>
wrote:
> On Donnerstag, Februar 7, 2002, at 02:14  Uhr,
> damian wrote:
> 
> > Usually by "anchoring" the end of the match. That
> might be:
> >
> >   myrule: 'stuff' mysubrule(?) ...!ID
> 
> it seems necessary to return a { 1 } here, as the
> rule
> fails otherwise, presumably because of the negative
> lookahead:
> 
>    myrule: 'stuff' mysubrule(?) ...!ID { 1 }
> 
> >   mysubrule: ID <commit> '[' ']'
> >            | <error?> <reject>
> >
> > or
> >
> >   myrule: 'stuff' mysubrule(?) /\s*\Z/
> >
> >   mysubrule: ID <commit> '[' ']'
> >            | <error?> <reject>
> >
> >
> > or whatever addition confirms that there really
> wasn't anything else
> > after 'stuff'.
> 
> another option would be the use of a rulevar:
> 
>    myrule : <rulevar: local $failed>
>    myrule : 'stuff' mysubrule(?) <reject:$failed>
> 
>    mysubrule: ID <commit> '[' ']'
>             | <error?> { $failed++ }
> 
> this way you don't have to specify a potentially
> complex negative
> lookahead, and the method works over several levels
> of subrules
> as well.
> 
> marcel
> 
> 


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