1 files changed, 35 insertions, 0 deletions

diff --git a/lib/Postdelay/TimeSpec/Utils.hs b/lib/Postdelay/TimeSpec/Utils.hs
new file mode 100644
index 0000000..e4ba732
--- /dev/null
+++ b/lib/Postdelay/TimeSpec/Utils.hs
@@ -0,0 +1,35 @@
+{-# LANGUAGE RankNTypes, ConstraintKinds, TypeFamilies, FlexibleContexts, ScopedTypeVariables, ViewPatterns #-}
+
+module Postdelay.TimeSpec.Utils where
+
+import Control.Applicative
+import Control.Monad
+import Control.Lens
+
+import Data.Time
+import Data.Time.Zones
+
+import Data.AdditiveGroup
+
+import Text.Megaparsec
+import Text.Megaparsec.Prim (MonadParsec)
+import qualified Text.Megaparsec.Lexer as L
+
+
+type StringParser s m = (MonadParsec Dec s m, Token s ~ Char)
+
+  
+spaceConsumer :: StringParser s m => m ()
+spaceConsumer = L.space (void spaceChar) empty empty
+
+lexeme :: StringParser s m => m a -> m a
+lexeme = L.lexeme spaceConsumer
+
+signed, optSigned :: (StringParser s m, AdditiveGroup n) => m n -> m n
+signed = (<*>) (lexeme sign)
+optSigned = (<*>) (option id $ lexeme sign)
+
+sign :: (StringParser s m, AdditiveGroup n) => m (n -> n)
+sign = choice [ id <$ char '+'
+              , negateV <$ char '-'
+              ]