Mark Tozzi 17358b5af7
(refactor) Extract Empty/Script/Missing ValuesSource behavior to an interface (#48320) (#49330)
This is a pure code rearrangement refactor.  Logic for what specific ValuesSource instance to use for a given type (e.g. script or field) moved out of ValuesSourceConfig and into CoreValuesSourceType (previously just ValueSourceType; we extract an interface for future extensibility).  ValueSourceConfig still selects which case to use, and then the ValuesSourceType instance knows how to construct the ValuesSource for that case.
2019-11-19 16:44:29 -05:00
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