%  Copyright (C) 2008 Eric Kow
%
%  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, 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; see the file COPYING.  If not, write to
%  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
%  Boston, MA 02110-1301, USA.


\begin{code}
module English where

englishNum :: Nounlike n => Int -> n -> ShowS
englishNum x = if x < 2 then singular else plural

class Nounlike a where
  plural :: a -> ShowS
  singular :: a -> ShowS

newtype Noun = Noun String

instance Nounlike Noun where
  plural (Noun "") = id
  plural (Noun s) | last s == 'e' = showString s .  showChar 's'
  plural (Noun s) = showString s . showString "es"
  singular (Noun s) =  showString s

data This = This Noun

instance Nounlike This where
  plural (This s)   = showString "these "  . plural s
  singular (This s) = showString "this "   . singular s
\end{code}
