[openstack-dev] [Heat] Conditionals, was: New function: first_nonnull
alexisl at hp.com
Mon Nov 10 17:34:13 UTC 2014
Zane Bitter said on Fri, Nov 07, 2014 at 12:35:09AM +0100:
> Crazy thought: why not just implement conditionals? We had a
> proto-spec for them started at one point...
I didn't know that was on the table :)
How about we support YAQL expressions? https://github.com/ativelkov/yaql
Plus some HOFs (higher-order functions) like cond, map, filter, foldleft
- yaql: "$.0 != null"
Making the 'yaql' function eponymous means we can easily plug other
expression languages in later if we choose.
We can restrict the functions available to YAQL expressions to avoid a
Each HOF will know how to populate the context for subordinate YAQL
expressions. When used outside a HOF, only add a default context of
parameters and input_values.
Is this totally crazy or worth spec-ifying?
Nova Engineer, HP Cloud. AKA lealexis, lxsli.
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