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Add ability to define custom predicate functions #497
Description
Hi!
I'm currently working on a project that would like to use this as the primary language to build filters for it's frontend.
At the moment, we're hoping to allow users to write queries like Nodes | filter(.Name=="cat"). We're currently facing an issue though, as Nodes isn't a slice. This leads to issues like array.Len() causing panics in the VM every time we hit an OpBegin.
As we don't control the layout/go type of the data we're passing into expr, would you be against defining some way to implement functions that take custom predicates?
Looking forwards, this could also be a good place to look into support for the changes proposed in golang/go#61898.
Activity
antonmedv commentedon Dec 22, 2023
Yes, it is possible to implement next expression, even if
Nodesis not an array.To do it you can create a patcher which will be wrapping Nodes inside filter into a helper function. The helper function will transform Nodes to an array.
After the patcher resulting code should look like this: