Interesting poll results! I didn't expect Attoparsec to go toe-to-toe with Megaparsec.
So I did some digging into #Haskell based programming language projects on Github, and here's what I found (lexer and parser mentioned separately, if different):
- Purescript: handwritten + Happy
- Elm: handwritten
- Agda: Alex + Happy
- Dex: Megaparsec
- Carp: Parsec
- Dhall: Megaparsec
- Grace: Megaparsec + Earley
- Plutus: Megaparsec
- Grin: Megaparsec
- Futhark: Alex + Happy
- Granule / Gerty: Alex + Happy
- Kaleidoscope: Parsec
- Egison: Megaparsec
- Amulet: Alex + Happy
- Paskell: Parsec
- Facet: Handwritten + Parsec
- Eclair: Megaparsec
- Olifant: Megaparsec
- Shellcheck: Parsec
- Nixfmt: Megaparsec
It seems like Megaparsec is the clear winner when it comes to parsing programming languages in Haskell. However, if I focus on projects that parse file formats and network protocols, Attoparsec is the most popular one.
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