[Python-Dev] Re: PEP 624: Remove Py_UNICODE encoder APIs

2021年2月02日 14:46:05 -0800

On Tue, Feb 2, 2021 at 9:40 PM Emily Bowman <[email protected]> wrote:
>
> On Tue, Feb 2, 2021 at 3:47 AM Inada Naoki <[email protected]> wrote:
>>
>> But when wchar_t* is UTF-16, ucs2_utf8_encoder() can not handle
>> surrogate escape.
>> We need to use a temporary Unicode object. That is what "inefficient" means.
>
>
> Since real UCS-2 is effectively dead, maybe it should be flipped around: Make 
> UTF-16 be the efficient path and UCS-2 be the path that needs to round-trip 
> through Unicode. But I suppose that's out of scope for this PEP.
>
> -Em
Note the ucs2_utf8_encoder() is used only for encoding Python Unicode
object for now.
Unicode object is latin1, UCS2, or UCS4. It never be UTF-16.
So if we support add UTF-16 support to ucs2_utf8_encoder(), it means
we need to add code and maintain only for PyUnicode_EncodeUTF8 (encode
from wchar_t* into char*).
I don't think it is a good deal. As described in the PEP, encoder APIs
are used very rarely.
We must not add any maintainece costs for them.
Regards,
-- 
Inada Naoki <[email protected]>
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