gulcii-0.3: src/Meta.hs

{-
    gulcii -- graphical untyped lambda calculus interpreter
    Copyright (C) 2011, 2013, 2017  Claude Heiland-Allen

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-}

module Meta (Meta(..), parse) where

import Control.Applicative((<|>), (<$), (<*>))

import Setting (Setting)
import qualified Setting
import Parse

data Meta = Start | Stop | Quit | Clear | Browse | Load String | Get Setting | Set Setting | UnSet Setting | Toggle Setting
  deriving (Read, Show, Eq, Ord)

parse :: Parser String Meta
parse =  (Start  <$ sym "start")
     <|> (Stop   <$ sym "stop")
     <|> (Quit   <$ sym "quit")
     <|> (Clear  <$ sym "clear")
     <|> (Browse <$ sym "browse")
     <|> (Load   <$ sym "load" <*> name)
     <|> (Get    <$ sym "get" <*> Setting.parse)
     <|> (Set    <$ sym "set" <*> Setting.parse)
     <|> (UnSet  <$ sym "unset" <*> Setting.parse)
     <|> (Toggle <$ sym "toggle" <*> Setting.parse)