GLR support in happy is much younger than ghc is, it'd probably be a massive amount of work to change now. On Tue, Apr 20, 2021 at 6:57 AM Benjamin Redelings < benjamin.redelings@gmail.com> wrote:
Thanks, that is interesting. I see this is a different type of grammar than in Parser.y, in that (for example) it does not have any actions on the rules.
I'm still curious about why the GHC parser does not use a grammar that is closer to the language grammar. Is this mostly for historical reasons? Are GLR parsers too slow? I don't know what fraction of the compilation time is spent in parsing, but would suspect it is not that much.
-BenRI
On 4/15/21 11:55 AM, Georgi Lyubenov wrote:
Hi!
I think the updated tree sitter grammar might be relevant to you -Â https://github.com/tree-sitter/tree-sitter-haskell https://github.com/tree-sitter/tree-sitter-haskell
Cheers,
====== Georgi
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