[swift-evolution] SE-163: String Revision: Collection Conformance, C Interop, Transcoding

[Hooman Mehr]

+1 with this clarification / revision

> On Apr 6, 2017, at 5:34 PM, Ben Cohen via swift-evolution <swift-evolution at swift.org> wrote:
> 
> 
>> On Apr 5, 2017, at 10:32 PM, Félix Cloutier <felixcca at yahoo.ca <mailto:felixcca at yahoo.ca>> wrote:
>> 
>> During the proposal phase, we asked how this would handle fixed-length strings with an optional NUL terminator. For instance, in a C `struct Foo { char name[8]; };`, `name` stops at the first \0, or at the eighth byte, whichever comes first. IIRC, Ben said that it would be handled, but I'd like to have it clarified.
>> 
>> Is it correct to assume that a UnicodeEncoding is expected to return UnicodeParseResult.emptyInput when it sees a NUL character (thus stopping before the end of the buffer if necessary)? Is it also correct to assume that if you need this functionality, you'll be looking at code like this?
>> 
>> var result = ""
>> UnicodeEncoding.parseForward(bufferPointer) { result += $0 }
>> 
> 
> 
> Hi Félix,
> 
> Having talked about it among the team, it feels like we should add an initializer from a Collection of code units to this proposal.  Therefore given a pointer p to some utf8 and a length n, you would write:
> 
> let b = UnsafeBuffer(start: p, count: n)
> // naming opinions on the argument labels welcomed, this is probably what I’d go for...
> let s = String(b, fromEncoding: UTF8.self)
> 
> Similar to the C string inits, this would only be a repairing initializer.
> 
> Your request goes a little bit further though. For that, I would say that it probably doesn’t deserve a special dedicated initializer. You could instead search for the nil using index(of:):
> 
> let i = b.index(of: 0)
> let s = String(b[..<i], UTF8.self)  // one-sided ranges pitch forthcoming ;)
> 
> Does this sound reasonable?
> 
>>> Le 5 avr. 2017 à 11:39, John McCall via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> a écrit :
>>> 
>>> Hello, Swift community!
>>> 
>>> The review of "SE-163: String Revision: Collection Conformance, C Interop, Transcoding" begins now and runs through next Tuesday, April 11th. The proposal is available here:
>>> 	https://github.com/apple/swift-evolution/blob/master/proposals/0163-string-revision-1.md <https://github.com/apple/swift-evolution/blob/master/proposals/0163-string-revision-1.md>
>>> 
>>> Reviews are an important part of the Swift evolution process. All reviews should be sent to the swift-evolution mailing list at
>>> 	https://lists.swift.org/mailman/listinfo/swift-evolution <https://lists.swift.org/mailman/listinfo/swift-evolution>
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>>> 
>>> 	Proposal link: https://github.com/apple/swift-evolution/blob/master/proposals/0155-normalize-enum-case-representation.md <https://github.com/apple/swift-evolution/blob/master/proposals/0155-normalize-enum-case-representation.md>
>>> 
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