Add IR quadruple definitions

lib/Language/Elna/Intermediate.hs

@@ -0,0 +1,44 @@
+module Language.Elna.Intermediate
+    ( Label(..)
+    , Operand(..)
+    , Quadruple(..)
+    , Variable(..)
+    ) where
+
+import Data.Int (Int32)
+import Data.Word (Word32)
+import Data.Text (Text)
+
+data Operand
+    = VariableOperand Text
+    | IntOperand Int32
+    deriving (Eq, Show)
+
+newtype Label = Label Text
+    deriving (Eq, Show)
+
+newtype Variable = Variable Text
+    deriving (Eq, Show)
+
+data Quadruple
+    = StartQuadruple
+    | GoToQuadruple Label
+    | AssignQuadruple Operand Variable
+    | ArrayQuadruple Variable Word32 Variable
+    | ArrayAssignQuadruple Operand Word32 Variable
+    | AddQuadruple Operand Operand Variable
+    | SubtractionQuadruple Operand Operand Variable
+    | ProductQuadruple Operand Operand Variable
+    | DivisionQuadruple Operand Operand Variable
+    | NegationQuadruple 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
+    | ParameterQuadruple Operand
+    | CallQuadruple Variable Word32
+    | StopQuadruple
+    deriving (Eq, Show)