Chat about elm/parser operators |. and |=

evancz · May 26, 2020, 9:35pm

I use elm/parser to parse Elm types for the package website, so you can take a look at how the operators look in that context:

github.com

elm/project-metadata-utils/blob/1.0.1/src/Elm/Type.elm

module Elm.Type exposing
  ( Type(..)
  , decoder
  )

{-| This is specifically for handling the types that appear in
documentation generated by `elm-make`. If you are looking to parse
arbitrary type signatures with creative indentation (e.g. newlines
and comments) this library will not do what you want. Instead,
check out the source code and go from there. It's not too tough!

@docs Type, decoder

-}

import Char
import Json.Decode as Decode exposing (Decoder)
import Parser exposing (..)
import Set
import String

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I wrote this parser to meet the goal of parsing types fast enough that it’s not a problem on the package website, so I’m not sure how well it works as a learning resource. It seems alright looking over it, but I’d give more consideration if it was meant for learning!

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Chat about elm/parser operators |. and |=

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