|2 months ago||8 days ago|
|MIT License||Apache License 2.0|
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-🎄- 2021 Day 18 Solutions -🎄-
144 projects | reddit.com/r/adventofcode | 17 Dec 2021
Mostly a mess of pattern matching. I really need to make some generic tree utilities. Haven't been able to find a decent parser combinator that works in Scala 3 (I usually use fastparse which depends heavily on Scala 2 macros, and scala-parser-combinators works in Scala 3, but I've had a lot of trouble getting it to not be too greedy), so I used the state monad from cats to parse at the bottom of the file, which I think turned out fairly nice.
Parser generators vs. handwritten parsers: surveying major languages in 2021
11 projects | news.ycombinator.com | 21 Aug 2021
Agreed! I would say that parser combinators are the sweet spot and the right choice in most cases.
Scala has them as well, e.g.: https://com-lihaoyi.github.io/fastparse/
And the good thing is, you don't have to learn a completely new language/syntax, you can use the host language's syntax and you have full IDE support as well.
Recommended CLI parsing libraries
5 projects | reddit.com/r/scala | 20 Feb 2021
That issue is not about sum types, it's about products of subcommand decoders. E.g. you might want to support a syntax like this:
Got A Quick Question Ask Here December 28 2020
1 project | reddit.com/r/scala | 25 Jan 2021
decline and nothing else comes close. It's great.
What are some alternatives?
Scala Parser Combinators - simple combinator-based parsing for Scala. formerly part of the Scala standard library, now a separate community-maintained module
Parboiled2 - A macro-based PEG parser generator for Scala 2.10+
atto - friendly little parsers
Scopt - command line options parsing for Scala
zio-cli - Rapidly build powerful command-line applications powered by ZIO
Lark - Lark is a parsing toolkit for Python, built with a focus on ergonomics, performance and modularity.
Scallop - a simple Scala CLI parsing library