<i18n dev> RFR: 8306031: Update IANA Language Subtag Registry to Version 2023-04-13 [v6]

[Naoto Sato]

On Thu, 20 Apr 2023 20:22:39 GMT, Justin Lu <jlu at openjdk.org> wrote:

>> Update the registry and accompanying tests with the **IANA 4/13/2022** update.
>> 
>> This update introduces the case where an IANA entry can have a preferred value, but that preferred value has a preferred value as well.
>> 
>> This causes unexpected failures in JDK tests because of how locale equivalencies are created.
>> 
>> eg: `ar-ajp` has a preferred value of `ajp` but `ajp` has a preferred value of `apc`
>> 
>> Normally, when the JDK is built, _LocaleEquivlalentMaps.java_ generates the following
>> 
>> 
>> ...
>> singleEquivMap.put("ar-ajp", "ajp");
>> singleEquivMap.put("ajp", "ar-ajp");
>> ...
>> multiEquivsMap.put("ajp", new String[] {"apc", "ar-apc"});
>> multiEquivsMap.put("apc", new String[] {"ajp", "ar-apc"});
>> multiEquivsMap.put("ar-apc", new String[] {"apc", "ajp"});
>> ...
>> 
>> 
>> When `LocaleMatcher.parse(ACCEPT_LANGUAGE)` is called with `ACCEPT_LANGUAGE` containing `apc` and `ajp` in that order, the following occurs:
>> 
>> `apc` is found, `apc` is added, all of `apc's` equivalencies are added: `ajp` and `ar-apc`
>> 
>> When parse iterates to `ajp`, it finds that it is already added to the list, and does not add it's equivalency `ar-ajp`.
>> 
>> To address this, the build process must be adjusted so that the equivalencies are built as 
>> 
>> 
>> ...
>> multiEquivsMap.put("ajp", new String[] {"apc", "ar-ajp", "ar-apc"});
>> multiEquivsMap.put("apc", new String[] {"ajp", "ar-ajp", "ar-apc"});
>> multiEquivsMap.put("ar-ajp", new String[] {"apc", "ajp", "ar-apc"});
>> multiEquivsMap.put("ar-apc", new String[] {"apc", "ajp", "ar-ajp"});
>> ...
>> 
>> 
>> As, if `ar-ajp` has a preferred value of `ajp`, and `ajp` has a preferred value of `apc`, this technically means that `ar-ajp` is equivalent to `apc` and its equivalencies as well. This way, when `LocaleMatcher.parse(ACCEPT_LANGUAGE)` iterates to `apc`, it will add all of it's equivalencies including `ar-ajp`.
>
> Justin Lu has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Import ordering

LGTM

-------------

Marked as reviewed by naoto (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/13501#pullrequestreview-1396170956