Re: [PATCH v2] userdiff: add support for Swift

> Shlok Kulshreshtha <diy2903@gmail.com> writes:
> 
>> Add a built-in userdiff driver for the Swift programming language so that
>> diff hunk headers and word diffs work out of the box for ".swift" files.
>>
>> The funcname pattern is built for Swift's own declaration grammar: an
>> optional run of attributes ("@objc", "@available(iOS 13, *)", ...),
>> followed by an optional run of lowercase modifiers ("public", "static",
>> "final", ...), followed by a declaration keyword (func, class, struct,
>> enum, protocol, extension, actor, init, deinit, subscript). The keyword
>> is followed by a boundary that allows whitespace, "(" (init/subscript),
>> "?" or "!" (failable init), or "<" (generics), while still acting as a
>> word boundary so e.g. "initialize(" does not match.
>>
>> The word regex recognizes Swift identifiers, hexadecimal, octal, binary,
>> integer and floating-point literals, and the language's operators.
>>
>> Signed-off-by: Shlok Kulshreshtha <diy2903@gmail.com>
>> ---
>> v2, addressing Johannes Sixt's review of v1
>> (<2a3a73c5-5e90-44a3-bf6a-6e98ce5e5a59@kdbg.org>).  Changes since v1:
>>
>>  - t4018/swift-{init,failable-init,generic-subscript}: "RIGHT" now
>>    appears only once, on the declaration line, so the expected header is
>>    unambiguous.
>>  - word regex: dropped the redundant "?" after the single-character
>>    operator class.  Single characters are already covered by the
>>    "|[^[:space:]]" fallback that the PATTERNS macro appends, so only the
>>    two-character forms need to be spelled out.
>>
>> (A couple of Hannes's other suggestions I kept as-is; I have explained
>> the reasoning in a reply to his review.)
> 
> Thanks for an update.
> 
> Let's wait for a few days to see if we hear more comments and
> otherwise mark the topic for 'next'.