I appear to be able to read Text.Megaparsec.Expr! This is a breakthrough for me. I think I refactor it. Thanks, and sorry for the noise. On Sat, Aug 19, 2017 at 3:13 AM, S D Swierstra wrote:

Make the #uses expr #because expr #needs part act like an operator?

Doaitse

Op 19 aug. 2017 om 05:56 heeft Jeffrey Brown het volgende geschreven:

I want to write a parser that lets someone write "(a #uses b) #because (c #needs d)" and read it into a tree:

data Tree = Tree String Tree Tree | Leaf String magic "(a #uses b) #because (c #needs d)" = Tree "because" (Tree "uses" (Leaf "a") (Leaf "b")) (Tree "needs" (Leaf "c") (Leaf "d"))

I thought I could use Text.Megaparsec.Expr for it, but now I realize it hadnles binary operations, and this is a ternary one.

Suggestions?

-- Jeff Brown | Jeffrey Benjamin Brown Website https://msu.edu/~brown202/ | Facebook https://www.facebook.com/mejeff.younotjeff | LinkedIn https://www.linkedin.com/in/jeffreybenjaminbrown(spammy, so I often miss messages here) | Github https://github.com/jeffreybenjaminbrown

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-- Jeff Brown | Jeffrey Benjamin Brown Website https://msu.edu/~brown202/ | Facebook https://www.facebook.com/mejeff.younotjeff | LinkedIn https://www.linkedin.com/in/jeffreybenjaminbrown(spammy, so I often miss messages here) | Github https://github.com/jeffreybenjaminbrown