Re: Question on extensibility of a gobo lexer/parser

Hi Thomas

thomas beale wrote:
> Hi Eric,
> we have various parsers in openEHR that follow the standard pattern published in your documentation, i.e. a .y & .l file generating the usual .e files. 
> 
> Now let's say Organisation A publishes a language and parser to go with it, such as the dadl syntax we use - some example files - http://www.openehr.org/svn/knowledge2/TRUNK/rm_schemas/
> 
> Let's say that Org B wants to use this syntax but extend it by adding some new patterns that can be recognised.
> 
> How can Org B use Org A's published stuff to do this? Org B needs to add more patterns into the lexer definition, and more production rules into the parser definition. But there is no way to inherit a .y file into another .y file. Is there any kind of inclusion or other reuse mechanism available?
> 
> To make the question more concrete, if it helps, imagine Org A's parser does not support date/time patterns between the <> delimiters, but Org B needs date/times. How could Org B add it (other than taking a copy of Org A's .l/.y files, which of course defeats any kind of maintenance)?

I don't think that there is any reuse facility in .l and .y
files. I'm afraid that the only solution is copy/paste.

-- 
Eric Bezault
mailto:ericb-D6Qt/9opevxWk0Htik3J/[email protected]
http://www.gobosoft.com


------------------------------------

To Post a message, send it to:   [email protected]
To Unsubscribe, send a blank message to: [email protected]! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/gobo-eiffel/

<*> Your email settings:
    Individual Email | Traditional

<*> To change settings online go to:
    http://groups.yahoo.com/group/gobo-eiffel/join
    (Yahoo! ID required)

<*> To change settings via email:
    [email protected] 
    [email protected]

<*> To unsubscribe from this group, send an email to:
    [email protected]

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/