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Date: Fri, 21 Jun 2024 17:57:00 +0200
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Subject: Re: [PHP-DEV] [Early Feedback] Pattern matching
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From: Marc Bennewitz <marc@mabe.berlin>
To: internals@lists.php.net
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Subject: Re: [PHP-DEV] [Early Feedback] Pattern matching
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    <p>Hi Larry,<br>
    </p>
    <div class=3D"moz-cite-prefix">On 20.06.24 19:38, Larry Garfield
      wrote:<br>
    </div>
    <blockquote type=3D"cite"
      cite=3D"mid:2a6b92eb-d5e9-4a1a-9548-a068ac42ebd2@app.fastmail.com">=

      <pre class=3D"moz-quote-pre" wrap=3D"">Hello, peoples.

Ilija and I have been working on and off on an RFC for pattern matching s=
ince the early work on Enumerations.  A number of people have noticed and=
 said they're looking forward to it.

It's definitely not going to make it into 8.4, but we are looking for ear=
ly feedback on scoping the RFC.  In short, there's a whole bunch of possi=
ble patterns that could be implemented, and some of them we already have,=
 but we want to get a sense of what scope the zeitgeist would want in the=
 "initial" RFC, which would be appropriate as secondary votes, and which =
we should explicitly save-for-later.  The goal is to not spend time on pa=
rticular patterns that will be contentious or not pass, and focus effort =
on fleshing out and polishing those that do have a decent consensus.  (An=
d thereby, we hope, avoiding an RFC failing because enough people dislike=
 one little part of it.)

To that end, we're looking for *very high level* feedback on this RFC:

<a class=3D"moz-txt-link-freetext" href=3D"https://wiki.php.net/rfc/patte=
rn-matching">https://wiki.php.net/rfc/pattern-matching</a>

By "very high level," I mean, please, do not sweat specific syntax detail=
s right now.  That's a distraction.  What we're asking right now is "whic=
h of these patterns should we spend time sweating specific syntax details=
 on in the coming weeks/months?"  There will be ample time for detail bik=
eshedding later, and we've identified a couple of areas where we know for=
 certain further syntax development will be needed because we both hate t=
he current syntax. :-)

If you want to just read the Overview section for a survey of the possibl=
e patterns and our current recommendations, you likely don't need to read=
 the rest of the RFC at this point.  You can if you want, but again, plea=
se stay high-level.  Our goal at the moment is to get enough feedback to =
organize the different options into three groups:

1. Part of the RFC.
2. Secondary votes in the RFC.
3. Future Scope.

So we know where to focus our efforts to bring it to a proper discussion.=


Thank you all for your participation.
</pre>
    </blockquote>
    <p>Is is already a really nice RFC, even if not finished yet. Also
      haven't fully read it yet.<br>
      Thank you for all your work and time put into it!<br>
    </p>
    <p>I do have some questions:</p>
    <p>* For the generics-like pattern I do agree with the others that
      this might be dangerous for the future if we (hopefully) are going
      at it.</p>
    <p>* <span class=3D"co1">Capturing values out of a pattern and
        binding them to variables if matched.</span></p>
    <p>Where this is very helpful especially with `match`, from the
      syntax I would read it as a condition only.</p>
    <p>=C2=A0=C2=A0=C2=A0 <span class=3D"re0">$p</span> is Point <span cl=
ass=3D"br0">{</span>x<span
        class=3D"sy0">:</span> <span class=3D"nu0">3</span><span
        class=3D"sy0">,</span> y<span class=3D"sy0">:</span> <span
        class=3D"re0">$y</span><span class=3D"br0">}</span><span class=3D=
"sy0">;
        // read as $p-&gt;y =3D=3D=3D $y but it's $y =3D </span><span
        class=3D"sy0">$p-&gt;y</span></p>
    <p>But this is described differently</p>
    <p>=C2=A0 =C2=A0 <span class=3D"re0">$p</span> is Point <span class=3D=
"br0">{</span>y<span
        class=3D"sy0">:</span> <span class=3D"nu0">37</span><span
        class=3D"sy0">,</span> x<span class=3D"sy0">:@</span><span
        class=3D"br0">(</span><span class=3D"re0">$x</span><span class=3D=
"br0">)</span><span
        class=3D"br0">}</span><span class=3D"sy0">;</span></p>
    <p> </p>
    <p>I think it would be more readable on switching the logic
      (somehow). like:<br>
    </p>
    <p>=C2=A0=C2=A0=C2=A0 <span class=3D"re0">$p</span> is Point <span cl=
ass=3D"br0">{</span>x<span
        class=3D"sy0">:</span> <span class=3D"nu0">3</span><span
        class=3D"sy0">,</span> y<span class=3D"sy0">:</span> <span
        class=3D"re0">$y</span><span class=3D"br0">}</span><span class=3D=
"sy0">;
        // </span><span class=3D"sy0">$p-&gt;y =3D=3D=3D $y<br>
        =C2=A0=C2=A0=C2=A0 </span><span class=3D"re0">$p</span> is Point =
<span
        class=3D"br0">{</span>x<span class=3D"sy0">:</span> <span
        class=3D"nu0">3</span><span class=3D"sy0">,</span> y<span
        class=3D"sy0">:</span>=3D&gt; <span class=3D"re0">$y</span><span
        class=3D"br0">}</span><span class=3D"sy0">; // </span><span
        class=3D"sy0">$y =3D </span><span class=3D"sy0">$p-&gt;y <br>
      </span></p>
    <p>* Regex pattern</p>
    <p>This one is interesting as well ... but I would expect native
      regex syntax first before introducing it as part of a different
      RFC. Similar as generics.</p>
    <p>Following up I would expect something like this:</p>
    <p>=C2=A0=C2=A0=C2=A0 $re =3D /.*/;=C2=A0 // RegEx object<br>
      =C2=A0=C2=A0=C2=A0 $matches =3D $re-&gt;match($v); // preg_match<br=
>
      =C2=A0=C2=A0=C2=A0 $v is $re; // used in pattern matching</p>
    <p>which opens up another question: Could we have an interface
      allowing objects to match in a specific way?</p>
    <p>=C2=A0=C2=A0=C2=A0 interface Matchable {<br>
      =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 public function match(mi=
xed $value): bool;<br>
      =C2=A0=C2=A0=C2=A0 }</p>
    <p>Thanks for working on it!<br>
    </p>
    <p>Marc<br>
    </p>
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Content-Description: OpenPGP digital signature
Content-Disposition: attachment; filename="OpenPGP_signature.asc"

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-----END PGP SIGNATURE-----

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