Re: [Haskell-cafe] Ternary infix expression parser

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 | Facebook | LinkedIn(spammy, so I often miss messages here) | Github _______________________________________________ Haskell-Cafe mailing list To (un)subscribe, modify options or view archives go to: http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe Only members subscribed via the mailman list are allowed to post.