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ResolveTemp in Lazy Rule relating to another Lazy Rule [message #985718]

Thu, 15 November 2012 14:05

Eclipse User

Hi,
I have a lazy rule which contains a resolveTemp. The resolveTemp has a pattern which another lazy rule matches. However, I never achieve a match. I thought this was supported, did I misunderstand the User Guide? The guide states this is possible "the target pattern and do sections of a called rule, provided that this called rule is executed after the matching phase (e.g. is not called from a transformation entrypoint)."

If I change the latter rule from a lazy rule to a called rule then I see a match.

Any ideas?

Thanks,
Ronan

Re: ResolveTemp in Lazy Rule relating to another Lazy Rule [message #985730 is a reply to message #985718]

Thu, 15 November 2012 15:45

Eclipse User

Ronan,
as far as I know, you can use resolveTemp only to match the output of non-lazy matched rules, not of lazy or called rules.
resolveTemp would not be suitable for non-unique lazy rules anyway, as these create new output each time they're called.

I can only guess that you are trying to get the output of varying rules in the same place; an idiom I use for that purpose is an overloaded helper (= several helpers of the same name in different contexts), each of them calling another lazy rule; overloading of rules is simulated this way.

[Updated on: Thu, 15 November 2012 15:46] by Moderator

Re: ResolveTemp in Lazy Rule relating to another Lazy Rule [message #985910 is a reply to message #985730]

Fri, 16 November 2012 11:03

Eclipse User

Hi Gunnar,
Yep you guessed right on the use-case. Thanks for the tip on using helpers. I'm afraid the code is getting a little unmaintainable with lazy rules and this will make it more complex.
Thanks!
Ronan

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