(Sorry for the very slow reply, my inbox is a mess.)
-Kenton
On Mon, Jan 30, 2023 at 6:09 PM Kenton Varda wrote:
> Hi Yorhel,
>
> Cool stuff. It's neat that Zig can run code at compile time.
>
> Question, though: are you calling the C++ parser library to parse Cap'n
> Proto schema language, or did you write a whole new parser for it? If the
> latter, I'm worried as the algorithm to decide the layout of structs is
> quite complex, especially when unions of groups are involved. If you are
> re-implementing that, it would be pretty easy to get wrong leading to
> subtle incompatibilities. Is it possible to invoke the parser from the C++
> implementation as a library, to convert from capnp IDL into schema.capnp
> format, which could then be interpreted by your implementation?
>
> -Kenton
>
> On Thu, Jan 12, 2023 at 6:06 AM 'Yorhel' via Cap'n Proto <
> capnproto@googlegroups.com> wrote:
>
>> Hi list,
>>
>> I've been working on a Cap'n Proto implementation for the Zig language.
>> This implementation is unusual in that it leverages the language's
>> compile-time code execution capabilities to read a schema file - written
>> in Cap'n Proto's schema language, no separate compilation step required
>> - and then make the interfaces defined in the schema available to
>> library users.
>>
>> I wasn't 100% sure if this was going to work, but I now have a parser,
>> struct layouting algorithm and some rudimentary experiments with a
>> type-safe struct read/write API that compiles down to code that *should*
>> be just as efficient as if a code generation step was involved.
>>
>> Sadly, now that I've convinced myself that this might actually work out,
>> I've lost the motivation to do the remaining 80% of the work and turn it
>> into a usable library. So instead I'm publishing the unfinished product
>> with the hope that it might inspire or prove useful to someone. And, who
>> knows, maybe I'll continue to work on it some time in the future.
>>
>> The code is at https://code.blicky.net/yorhel/capnzig
>>
>> Documentation's kind of lacking - the code is commented here and there,
>> but making sense of everything may take effort. I'll be around to answer
>> questions if there are any.
>>
>> Here's hoping we'll have a mature Cap'n Proto implementation for Zig at
>> some point, regardless of which code generation strategy is taken.
>>
>> Yorhel.
>>
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