[swift-evolution] Smart KeyPaths

[Ricardo Parada]

By the way, I am okay with the syntax in the proposal too.  I'm just brainstorming so that we can look at all the options.  I am guessing the authors (David Smith, Michael LeHew and Joe Groff) probably went through this process already and settled with the simpler notation.  :-)


> On Mar 22, 2017, at 4:51 PM, Ricardo Parada via swift-evolution <swift-evolution at swift.org> wrote:
> 
> Yes, I was about to ask the same.  
> 
> It seems like all the sigil characters are taken.  This is one of the reasons why I did not object to the non-sigil notation originally proposed despite the ambiguity with static properties and instance properties with the same name.  But using a sigil seems like it can unify method references and key path references.
> 
> Is the single quote taken?  For example:
> 
> let path = 'Bag.things[0].name
> bag[path] 
> bag['Bag.things[0].name]
> bag['.things[0].name]
> bag.things[0]['.name]
> bag.things[0]['Thing.name]
> 
> And the examples on the proposal would become:
> 
> 'Person.friends[0].name
> luke['.friends[0].name]
> luke.friends[0]['.name]
> 
> If we were to put it between root and the path then it would look like this:
> 
> let path = Bag'things[0].name
> bag[path] 
> bag[Bag'things[0].name]
> bag['things[0].name]
> bag.things[0]['name]
> bag.things[0][Thing'name]
> 
> 
> Right now the compiler tells me that it found an "unterminated string literal".  
> 
> When I add the closing single quote then it tells me "single-quoted string literal found, use '"' instead"
> 
> 
> 
> 
>> On Mar 22, 2017, at 3:16 PM, Brent Royal-Gordon via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>> 
>>> On Mar 22, 2017, at 9:00 AM, Vladimir.S via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>>> 
>>> bag[#path]
>> 
>> What do these do?
>> 
>> 	bag[#file]
>> 	bag[#line]
>> 	bag[#function]
>> 	// etc.
>> 
>> -- 
>> Brent Royal-Gordon
>> Architechies
>> 
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