Support for list/array slicing?

[Chance Zibolski]

Is there any support for slicing lists/arrays? 

For example:

% let x= ['foo', 'bar', 'baz']

x[1:2]

['bar', 'baz']

So far I've checked, but can't seem to find any reference functionality like this in the language spec. If it's not possible with CEL directly, would it be possible to define a macro that supports slicing?

[Chance Zibolski]

I managed to figure out how to implement it using a helper function in cel-go. Here's my code in case it helps anyone else: https://github.com/google/cel-go/compare/master...chancez:cel-go:pr/chancez/slice_function. 

Since https://github.com/google/cel-go/tree/master/ext seems to have a number of useful functions similar, I'll see if I can upstream it (and get some feedback on how to improve it).

[Tristan Swadell]

Hi Chance,

Feel free to submit a PR to the `ext` package and we can go from there.

Cheers,

-Tristan

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