Support numbering system variations in datetime patterns

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Support numbering system variations in datetime patterns #308

Open sffc opened 4 years ago

sffc commented 4 years ago

Hawaiian has the following data:

            "dateFormats": {
              "full": "EEEE, d MMMM y",
              "long": "d MMMM y",
              "medium": "d MMM y",
              "short": {
                "_value": "d/M/yy",
                "_numbers": "M=romanlow"
              }
            },

https://github.com/unicode-cldr/cldr-dates-full/blob/204e99e8b28a52239bb6de1bbc89986cb19c0d50/main/haw/ca-gregorian.json#L277

In the short format, I believe it wants the month formatted with lowercase Roman numerals. We will be able to support this once NumberFormat is implemented.

sffc commented 3 years ago

Blocked by #595

sffc commented 2 weeks ago

The plan here is for datagen to emit custom field lengths when there is a custom numbering system in the data. The custom field lengths will trigger the appropriate behavior at runtime.