lib/Hcompta/Model/Journal.hs

   1 {-# LANGUAGE DeriveDataTypeable #-}
   2 {-# OPTIONS_GHC -fno-warn-orphans #-}
   3 module Hcompta.Model.Journal where
   4
   5 import           Data.Data
   6 import qualified Data.Map.Strict as Data.Map
   7 import           Data.Typeable ()
   8 import qualified Data.Foldable
   9 import           Data.Foldable (Foldable)
  10
  11 import qualified Hcompta.Model.Transaction as Transaction
  12
  13 data Journal
  14  =   Journal
  15  { transactions :: Transaction.By_Date
  16  } deriving (Data, Eq, Read, Show, Typeable)
  17
  18 nil :: Journal
  19 nil =
  20         Journal
  21          { transactions = Data.Map.empty
  22          }
  23
  24 union :: Journal -> Journal -> Journal
  25 union
  26  Journal
  27  { transactions=t0
  28  }
  29  Journal
  30  { transactions=t1
  31  } =
  32         Journal
  33          { transactions = Data.Map.unionWith (++) t0 t1
  34          }
  35
  36 unions :: Foldable t => t Journal -> Journal
  37 unions =
  38         Data.Foldable.foldl'
  39          Hcompta.Model.Journal.union
  40          Hcompta.Model.Journal.nil