Summary:
This diff implements volume intervals in Duckling. It follows the AmountofMoney and Quantity modules in doing so.
I had to make one crucial choice here -- defining the core Volume data type -- and whether the attribute "Unit" was optional (i.e. "Maybe") or not. Like in Quantity and unlike in AmountOfMoney, I made it optional, so that latent volumes can be supported down the line in the codebase.
I also wrote the codebase to be more modular, such that future developers only need to add regular expressions rather than functions for any language. For instance, developers can simply define a fraction (e.g. "eighth") at the start of the file, and new rules will be generated automatically; rather than requiring the developer to create an entirely new rule, as previously. The only (partial) exceptions were in the Arabic and Russian Rules files, where the language structure is more difficult and so I cannot fully implement this. Developers for those two languages may need to write new rules, as before.
Reviewed By: patapizza
Differential Revision: D9043117
fbshipit-source-id: f08de4f167596b5b32d12a79268b8ab92c099b22
Summary: Add an option to return latent time entities. This can be used when one is pretty certain that the input contains a datetime.
Reviewed By: patapizza
Differential Revision: D7254245
fbshipit-source-id: e9e0503cace2691804056fcebdc18fd9090fb181
