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authoraarne <aarne@cs.chalmers.se>2008-05-21 09:26:44 +0000
committeraarne <aarne@cs.chalmers.se>2008-05-21 09:26:44 +0000
commit055c0d0d5a5bb0dc75904fe53df7f2e4f5732a8f (patch)
tree0e63fb68c69c8f6ad0f78893c63420f0a3600e1c /src-2.9/GF/Source/ErrM.hs
parent915a1de71783ab8446b1af9e72c7ba7dfbc12d3f (diff)
GF/src is now for 2.9, and the new sources are in src-3.0 - keep it this way until the release of GF 3
Diffstat (limited to 'src-2.9/GF/Source/ErrM.hs')
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diff --git a/src-2.9/GF/Source/ErrM.hs b/src-2.9/GF/Source/ErrM.hs
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--- a/src-2.9/GF/Source/ErrM.hs
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--- BNF Converter: Error Monad
--- Copyright (C) 2004 Author: Aarne Ranta
-
--- This file comes with NO WARRANTY and may be used FOR ANY PURPOSE.
-module GF.Source.ErrM where
-
--- the Error monad: like Maybe type with error msgs
-
-import Control.Monad (MonadPlus(..), liftM)
-
-data Err a = Ok a | Bad String
- deriving (Read, Show, Eq, Ord)
-
-instance Monad Err where
- return = Ok
- fail = Bad
- Ok a >>= f = f a
- Bad s >>= f = Bad s
-
-instance Functor Err where
- fmap = liftM
-
-instance MonadPlus Err where
- mzero = Bad "Err.mzero"
- mplus (Bad _) y = y
- mplus x _ = x