[Haskell-beginners] Parsing Terms in Brackets for Calculator

[Jeffrey Brown]

You're in luck! Text.Megaparsec.Expr[1] is designed to handle exactly this
problem. I put a tutorial of sorts[2] in a fork of it on Github.

[1]
https://www.stackage.org/haddock/nightly-2015-12-08/megaparsec-4.2.0/Text-Megaparsec-Expr.html
[2]
https://github.com/JeffreyBenjaminBrown/megaparsec/tree/master/Expr-studies

On Sat, Feb 2, 2019 at 3:03 AM Leonhard Applis <
Leonhard.Applis at protonmail.com> wrote:

> Hello,
>
> I'm currently doing my first steps in Haskell with a calculator and I'm
> stuck at the parser.
> I have a *data Term* which will build ... basically a tree of operations,
> and works fine.
>
> I need help for the function
> termify :: [Either Operator Term] -> Term
>
> It takes operators (such as +,**) and terms and output a new, bigger term
> and is mostly trivial.
> However, all attempts I've done for parsing brackets seem very ... crude
> and not like Haskell at all.
>
> The very first pattern match should check for the innermost brackets, and
> return termify for everything in between.
> I guess that I'm missing some really cool, haskelly solution here.
>
> Best Regards
> Leonhard
> _______________________________________________
> Beginners mailing list
> Beginners at haskell.org
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>


-- 
Jeff Brown | Jeffrey Benjamin Brown
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