On Thu, Jul 11, 2013 at 11:52 PM, Zbigniew Braniecki <zbraniecki at mozilla.com
<https://mail.mozilla.org/listinfo/es-discuss>
>/ wrote:
[...]
//
/1) CanonicalizeLanguageTag [1]
>/
/>/ Because language tags come from developers and users, ability to
/>/ canonicalize them is crucial to us. ECMA 402 specifies this function and
/>/ all we need is to expose it in the API
/>/
/
I was thinking the same thing recently, at least for
CanonicalizeLanguageTag. I was working with a platform that gave me a
language tag in non-canonical form, meaning I had to either canonicalize it
or rename my language files to match the same non-canonical form. Exposing
it as `Intl.canonicalizeLanguageTag(tag)` seems like a good idea.
Only exposing CanonicalizeLanguageTag does not seem useful to me without
having access to IsStructurallyValidLanguageTag. Most likely a combined
IsStructurallyValidLanguageTag + CanonicalizeLanguageTag function is
necessary/wanted for most use cases.
>/
/>/ 1.1) CanonicalizeLocaleList [2]
/>/
/>/ That would also be nice to have :)
/>/
/
I don't think you could expose CanonicalizeLocaleList directly without
altering it to return an array, you'd have to do something similar to step
5 of LookupSupportedLocales. I'm not sure we could change that function in
the spec without other abstracts potentially being affected by tainted a
Array.prototype, so I guess you'd need to specify a new function. In which
case I'm wondering if maybe you'd be better off with
`Intl.canonicalizeTags(tags)` which would cover both
CanonicalizeLanguageTag() and CanonicalizeLocaleList().
I don't see why you'd need to change CanonicalizeLocaleList at all. Just
let it return the internal list as-is, and then define
`Intl.canonicalizeLocaleList` like so:
Intl.canonicalizeLocaleList(locales):
1. Let canonicalizedLocaleList be the result of
CanonicalizeLocaleList(locales).
2. ReturnIfAbrupt(canonicalizedLocaleList).
3. Return CreateArrayFromList(canonicalizedLocaleList).
(ReturnIfAbrupt and CreateArrayFromList are defined in ES6 as internal
abstract operations.)
It also needs to be considered whether the duplicate removal in
CanonicalizeLocaleList creates any issues for users of a potential
`Intl.canonicalizeLocaleList` or `Intl.canonicalizeTags` function.
- André
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