On Mon, 2023-03-13 at 18:13 -0700, Andres Freund wrote: > What non-error code is returned in the above example?
When the collator for locale "asdf" is opened, the status is set to U_USING_DEFAULT_WARNING. That seemed very promising at first, but it's the same thing returned after opening most valid locales, including "en" and "en-US". It seems to only return U_ZERO_ERROR on an exact hit, like "fr-CA" or "root". There's also U_USING_FALLBACK_WARNING, which also seemed promising, but it's returned when opening "fr-FR" or "ja-JP" (falls back to "fr" and "ja" respectively). > Can we query the returned collator and see if it matches what we were > looking > for? I tried a few variations of that in my canonicalization / validation patch, which I called "validation". The closest thing I found is: ucol_getLocaleByType(collator, ULOC_VALID_LOCALE, &status) We could strip away the attributes and compare to the result of that, and it mostly works. There are a few complications, like I think we need to preserve the "collation" attribute for things like "de@collation=phonebook". Another thing to consider is that the environment might happen to open the collation you intend at the time the collation is created, but then later of course the environment can change, so we'd have to check every time it's opened. And getting an error when the collation is opened is not great, so it might need to be a WARNING or something, and it starts to get less useful. What would be *really* nice is if there was some kind of way to tell if there was no real match to a known locale, either during open or via some other API. I wasn't able to find one, though. Actually, now that I think about it, we could just search all known locales using either ucol_getAvailable() or uloc_getAvailable(), and see if there's a match. Not very clean, but it should catch most problems. I'll look into whether there's a reasonable way to match or not. > > I'm a bit confused by the dates. > https://icu.unicode.org/download/55m1 says > that version was released 2014-12-17, but the linked issue around > root locales > is from 2018: https://unicode-org.atlassian.net/browse/ICU-10823 - I > guess > the issue tracker was migrated at some point or such... The dates are misleading in both git (migrated from SVN circa 2016) and JIRA (migrated circa 2018, see https://unicode-org.atlassian.net/browse/ICU-1 ). It seems 55.1 was released in either 2014 or 2015. Regards, Jeff Davis
