<div dir="ltr"><div class="markdown-here-wrapper" style=""><p style="margin:0px 0px 1.2em!important">I like the idea behind this, but I think the proposed syntax abuses <code style="font-size:1em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">extension</code>, which applies to types not individual cases. Putting the code outside the enum also seems wrong, and it’s difficult to see how the compiler would handle it, in particular ensuring exhaustiveness. So I have come up with an alternate syntax using the example from the proposal that I think works a bit better (or at least might inspire someone else to improve it further):</p>
<pre style="font-size:1em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code class="hljs language-swift" style="font-size:1em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline;white-space:pre;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important;display:block;overflow-x:auto;padding:0.5em;color:rgb(51,51,51);background:rgb(248,248,248) none repeat scroll 0% 0%"><span class="hljs-class"><span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">enum</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">TokenState</span> </span>{
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">case</span> expired(at: <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">Date</span>)
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">case</span> validated(token: <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">String</span>)
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">case</span><span class="hljs-class"><span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">protocol</span> </span>{ <span class="hljs-comment" style="color:rgb(153,153,136);font-style:italic">// (1)</span>
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">mutating</span> <span class="hljs-func"><span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">func</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">react</span><span class="hljs-params">(to event: Event)</span>
<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">var</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">description</span>: <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">String</span>
}
<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">caseimpl</span><span class="hljs-generics"><.expired(let at)></span> </span>{ <span class="hljs-comment" style="color:rgb(153,153,136);font-style:italic">// (2)</span>
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">var</span> description: <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">String</span> {
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">return</span> <span class="hljs-string" style="color:rgb(221,17,68)">"Expired at <span class="hljs-subst" style="color:rgb(51,51,51);font-weight:bold;font-weight:normal">\(at)</span>"</span>
}
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">mutating</span> <span class="hljs-func"><span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">func</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">react</span><span class="hljs-params">(to event: Event)</span> </span>{
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">switch</span> event {
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">case</span> <span class="hljs-number" style="color:rgb(0,128,128)">_</span> <span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">as</span> <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">TokenRefreshed</span>:
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">self</span> = .validated(token: event.token)
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">default</span>: <span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">break</span>
}
}
}
caseimpl<.validated(<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">let</span> token)> { <span class="hljs-comment" style="color:rgb(153,153,136);font-style:italic">// (3)</span>
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">var</span> description: <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">String</span> {
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">return</span> <span class="hljs-string" style="color:rgb(221,17,68)">"Token <span class="hljs-subst" style="color:rgb(51,51,51);font-weight:bold;font-weight:normal">\(token)</span> has been validated."</span>
}
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">mutating</span> <span class="hljs-func"><span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">func</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">react</span><span class="hljs-params">(to event: Event)</span> </span>{
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">switch</span> event {
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">case</span> <span class="hljs-number" style="color:rgb(0,128,128)">_</span> <span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">as</span> <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">TokenRejected</span>:
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">self</span> = .expired(at: <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">Date</span>())
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">case</span> <span class="hljs-number" style="color:rgb(0,128,128)">_</span> <span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">as</span> <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">UserLoggedOut</span>:
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">self</span> = .expired(at: <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">Date</span>())
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">default</span>: <span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">break</span>
}
}
}
<span class="hljs-comment" style="color:rgb(153,153,136);font-style:italic">// (4)</span>
}
</code></pre>
<p style="margin:0px 0px 1.2em!important">I find this easier to parse manually, and I think the compiler would too…</p>
<ul style="margin:1.2em 0px;padding-left:2em">
<li style="margin:0.5em 0px">At <code style="font-size:1em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">(1)</code> it is equivalent to defining a normal protocol outside the enum. The enum itself would implicitly conform to this protocol. Calculated properties would be implicitly <code style="font-size:1em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">get</code>-only in the protocol.</li>
<li style="margin:0.5em 0px">At <code style="font-size:1em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">(2)</code> and <code style="font-size:1em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">(3)</code> this would be equivalent to defining a static object that conforms to a compiler-modified version of the protocol, with static implementations of the getters/functions. Mutating functions would have an <code style="font-size:1em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">inout</code> ref to <code style="font-size:1em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">self</code> and they would all have any associated values sent in as per the <code style="font-size:1em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">let</code> in the <code style="font-size:1em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">caseimpl</code> declaration. The body would come directly from the programmer code.</li>
<li style="margin:0.5em 0px">At <code style="font-size:1em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">(4)</code> the compiler would generate the enum’s implementation to conform to the protocol, this would <code style="font-size:1em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">switch</code> on <code style="font-size:1em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">self</code> and call the appropriate static functions. As per the original proposal.</li>
</ul>
<p style="margin:0px 0px 1.2em!important">It might be good if you don’t have to repeat all the func signatures in each <code style="font-size:1em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">caseimpl</code> - I considered a different syntax where you defined a <code style="font-size:1em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">casefunc</code> (similar to a <code style="font-size:1em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">typealias</code>) like <code style="font-size:1em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">casefunc ReactTo = mutating func react(to event: Event)</code> then in the <code style="font-size:1em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">caseimpl</code> you could just do <code style="font-size:1em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">ReactTo = { func body here }</code> but it didn’t seem to fit. Hopefully someone else will have some ideas to reduce the repetition.</p>
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