Is it a good choice to parse a grammar?

[nugmanoff]

Hey guys! First of all, thanks for an amazing library.

I am exploring ways to do lexing and then parsing into AST.
Valid syntax is something like numi.app / numbr.dev, i.e. intuitive notepad calculator kind of thing.

Looks like I can do it with swift-parsing, but maybe there are some performance quirks / pitfalls I am overlooking here. Alternative is to do it all by hand, just the usual scanning/parsing thing.

Appreciate any advice / opinion

[mbrandonw]

Hi @nugmanoff, it definitely is possible, and we have a few examples of this in our benchmark suite:

• Arithmetic: https://github.com/pointfreeco/swift-parsing/blob/main/Sources/swift-parsing-benchmark/Arithmetic.swift
• JSON: https://github.com/pointfreeco/swift-parsing/blob/main/Sources/swift-parsing-benchmark/JSON.swift

You could play around with those to see if they do what you want and have the performance characteristics you need.

[nugmanoff]

Thank you! I will give it a shot then!