<p dir="ltr">I think making the application of a ppx look more like a functor application solves the name spacing issue for the most part.</p>
<div class="gmail_quote">Den 6 maj 2014 06:29 skrev "Alain Frisch" <<a href="mailto:alain@frisch.fr">alain@frisch.fr</a>>:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
On 5/2/2014 4:29 PM, Peter Zotov wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
I have just released the first version of ppx_protobuf, a complete<br>
Protocol Buffers implementation.<br>
</blockquote>
<br>
This is a very cool project, and a good first public use of extension points!<br>
<br>
An aspect of attributes that is not fully settled is how to use namespacing in order to ensure that multiple tools interact nicely.<br>
This topic will hopefully be explored by the community to reach a good consensus.<br>
<br>
For instance, ppx_protobuf relies on attributes with quite generic names such as @default or @key, that might also be useful to other tools. It might very well be the case that the same @default attribute (with the same value) would actually be useful to both ppx_protobuf and another deriving-like extension. This is good, since attributes are not designed to be necessarily targeted to only one specific tool. But in some cases, one might want to use a different @default attribute for different tools. What about supporting both a short form @default and a more qualified one @protobuf.default? This should support both situations.<br>
<br>
Another point: for record fields, you interpret attributes at the toplevel of their type. I did not look precisely at the semantics of ppx_protobuf, but it seems that it might be more logical to attach them to the field directly (do you confirm?):<br>
<br>
type defaults = {<br>
results [@key 1] [@default 10]: int;<br>
} [@@protobuf]<br>
<br>
I understand that this form is syntactically "more intrusive" in the non-decorated type definition. Is it the reason to use:<br>
<br>
type defaults = {<br>
results : int [@key 1] [@default 10];<br>
} [@@protobuf]<br>
<br>
?<br>
<br>
I don't see anything wrong with doing so, although it might be worth supporting both forms.<br>
<br>
<br>
-- Alain<br>
<br>
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</blockquote></div>