module Language.Elna.Backend.Intermediate
    ( Operand(..)
    , Quadruple(..)
    {- , Label(..) -}
    , Variable(..)
    ) where

import Data.Int (Int32)
import Data.Word (Word32)
import Data.Text (Text)

newtype Variable = TempVariable Word32 -- | Variable Text
    deriving Eq

instance Show Variable
  where
    -- show (Variable variable) = '$' : Text.unpack variable
    show (TempVariable variable) = '$' : show variable

data Operand v
    = IntOperand Int32
    | VariableOperand v
    deriving (Eq, Show)

data Quadruple v
    = StartQuadruple
    | StopQuadruple
    | ParameterQuadruple (Operand v)
    | CallQuadruple Text Word32
    | AddQuadruple (Operand v) (Operand v) v
    | SubtractionQuadruple (Operand v) (Operand v) v
    | NegationQuadruple (Operand v) v
    | ProductQuadruple (Operand v) (Operand v) v
    | DivisionQuadruple (Operand v) (Operand v) v
    {-| GoToQuadruple Label
    | AssignQuadruple Operand Variable
    | ArrayQuadruple Variable Operand Variable
    | ArrayAssignQuadruple Operand Operand Variable
    | EqualQuadruple Operand Operand Label
    | NonEqualQuadruple Operand Operand Label
    | LessQuadruple Operand Operand Label
    | GreaterQuadruple Operand Operand Label
    | LessOrEqualQuadruple Operand Operand Label
    | GreaterOrEqualQuadruple Operand Operand Label
    | LabelQuadruple Label -}
    deriving (Eq, Show)