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 etc? Here's first_nonnull: config: Fn::Select - 0 filter: - yaql: "$.0 != null" - <item1> - <itemN> 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 halting problem. 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? Alexis -- Nova Engineer, HP Cloud. AKA lealexis, lxsli. _______________________________________________ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
