lib/Language/Elna/Backend/Intermediate.hs


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

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

newtype Label = Label { unLabel :: Text }
    deriving Eq

instance Show Label
  where
    show (Label label) = '.' : Text.unpack label

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
    | NonEqualQuadruple Operand Operand Label
    | LessQuadruple Operand Operand Label
    | GreaterQuadruple Operand Operand Label
    | LessOrEqualQuadruple Operand Operand Label
    | GreaterOrEqualQuadruple Operand Operand Label -}
    | EqualQuadruple (Operand v) (Operand v) Label
    | LabelQuadruple Label
    deriving (Eq, Show)