module Language.Fortran.Repr.Type.Scalar.String where

import Language.Fortran.Repr.Compat.Natural

import GHC.Generics ( Generic )
import Data.Data ( Data )
import Data.Binary ( Binary )
import Text.PrettyPrint.GenericPretty ( Out )
import Text.PrettyPrint.GenericPretty.Orphans()

-- | The length of a CHARACTER value.
--
-- IanH provides a great reference on StackOverflow:
-- https://stackoverflow.com/a/25051522/2246637
data CharLen
  = CharLen Natural
  -- ^ @CHARACTER(LEN=x)@ (where @x@ is a constant integer expression). Value
  --   has the given static length.

  | CharLenAssumed
  -- ^ @CHARACTER(LEN=*)@. F90. Value has assumed length. For a dummy argument,
  --   the length is assumed from the actual argument. For a PARAMETER named
  --   constant, the length is assumed from the length of the initializing
  --   expression.

  | CharLenDeferred
  -- ^ @CHARACTER(LEN=:)@. F2003. Value has deferred length. Must have the
  --   ALLOCATABLE or POINTER attribute.

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prettyCharLen :: Natural -> String
prettyCharLen :: Natural -> String
prettyCharLen Natural
l = String
"LEN="forall a. Semigroup a => a -> a -> a
<>forall a. Show a => a -> String
show Natural
l