Hi Conal, On Sun, Jan 15, 2012 at 6:45 AM, Conal Elliott <[email protected]> wrote:
> I'm using haskell-src-exts together with SYB for a code-rewriting project, > and I'm having difficulty with parenthesization. I naïvely expected that > parentheses would be absent from the abstract syntax, being removed during > parsing and inserted during pretty-printing. It's easy for me to remove > them myself, but harder to add them (minimally) after transformation. > Rather than re-inventing the wheel, I thought I'd ask for help. > It's not at all straight-forward to properly insert minimal parentheses during pretty-printing, since "minimal" is a semantic notion. For that to work, we would need the pretty-printer to take a set of known fixities as an argument, just like the parser currently does. I'm not opposed to the idea in principle, but it's not how it currently works. > Has anyone written automatic minimal parens insertion for haskell-src-exts? > ... or we could do it this way, in a two-stage modular process which gives even more flexibility. I'm not aware of any such functionality, currently, but if it exists (or happens to come into existence) then I would be interested in including it in haskell-src-exts. Best regards, /Niklas
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