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When you're supposed to use Rust, but you only know Python... (crates.io)

submitted 3 weeks ago by [email protected] to c/[email protected]

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So, this uses a macro, but if you're thinking anything is possible with a macro, it's actually not in Rust. The input does still need to parse as valid Rust tokens.

Which means the authors asked themselves at some point: Is the Rust syntax a superset of the Python syntax?
And well, it's not. In particular, some Python keywords will just be tokenized as an identifier (like a variable name).

But it is close enough that the authors decided against requiring a massive string to be passed in, which does amuse me. 🙃

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[–] [email protected] 54 points 3 weeks ago (1 children)

With projects like these, I'm always torn between thinking that it's cool it's possible, and horror that someone somewhere will try to use this in production code.

[–] [email protected] 8 points 3 weeks ago* (last edited 3 weeks ago)

It's probably both

[–] [email protected] 32 points 3 weeks ago (1 children)

Personally, I can’t wait to inline PHP in my rust code!

[–] [email protected] 14 points 3 weeks ago

Better yet inline PHP inside the inline python in your rust code

[–] [email protected] 22 points 3 weeks ago (1 children)

This is absurd, the amount of effort that must have gone into this purely for shits and/or giggles

[–] [email protected] 23 points 3 weeks ago* (last edited 3 weeks ago)

shits and/or giggles

That's probably the single most impactful cause for doing things with computers

[–] [email protected] 8 points 3 weeks ago* (last edited 3 weeks ago) (1 children)

is it converting the syntax to rust? wouldn't that be easier at the LLIL or i guess python bytecode level?

[–] [email protected] 13 points 3 weeks ago* (last edited 3 weeks ago) (1 children)

From what I understand, it works like this:

Rust compiler reads the pseudo-Python and tokenizes it according to Rust's rules.
Macro code converts the tokens back to (now proper) Python, while filling in the captured variables. I believe, this is the code that does this.
Python code is executed in an actual Python interpreter, via PyO3.

[–] [email protected] 6 points 3 weeks ago

oh ok nm i misunderstood. thanks

[–] [email protected] 4 points 2 weeks ago

What is it about python users just refusing to adapt to other languages?