Route.hs

{- This file is part of settings.
 -
 - Written in 2015 by fr33domlover <fr33domlover@rel4tion.org>.
 -
 - ♡ Copying is an act of love. Please copy, reuse and share.
 -
 - The author(s) have dedicated all copyright and related and neighboring
 - rights to this software to the public domain worldwide. This software is
 - distributed without any warranty.
 -
 - You should have received a copy of the CC0 Public Domain Dedication along
 - with this software. If not, see
 - <http://creativecommons.org/publicdomain/zero/1.0/>.
 -}

module Data.Settings.Route
    ( parseRoute
    , showRoute
    )
where

import Data.List (intercalate)
import Data.Settings.Types

-- | Split a path string into its components, if it's a valid path
-- syntactically.
parseRoute :: OptPath -> Maybe OptRoute
parseRoute "" = Just []
parseRoute s  =
    case break (== '.') s of
        ("", _)     -> Nothing
        (p, "")     -> Just [p]
        (p, (c:cs)) ->
            case parseRoute cs of
                Nothing -> Nothing
                Just ps -> Just $ p : ps

-- | Create a string representation of a path, with the parts separated by
-- periods.
showRoute :: OptRoute -> OptPath
showRoute = intercalate "."