module Ast where

type CompilationUnit = [Class]
type DataType = String
type Identifier = String 

data ParameterDeclaration = ParameterDeclaration DataType Identifier deriving (Show, Eq)
data VariableDeclaration = VariableDeclaration DataType Identifier (Maybe Expression) deriving (Show, Eq)
data Class = Class DataType [MethodDeclaration] [VariableDeclaration] deriving (Show, Eq)
data MethodDeclaration = MethodDeclaration DataType Identifier [ParameterDeclaration] Statement deriving (Show, Eq)

data Statement
  = If Expression Statement (Maybe Statement)
  | LocalVariableDeclaration VariableDeclaration
  | While Expression Statement
  | Block [Statement]
  | Return (Maybe Expression)
  | StatementExpressionStatement StatementExpression
  | TypedStatement DataType Statement
  deriving (Show, Eq)

data StatementExpression
  = Assignment Expression Expression
  | ConstructorCall DataType [Expression]
  | MethodCall Expression Identifier [Expression]
  | TypedStatementExpression DataType StatementExpression
  | PostIncrement Expression
  | PostDecrement Expression
  | PreIncrement Expression
  | PreDecrement Expression
  deriving (Show, Eq)

data BinaryOperator
  = Addition
  | Subtraction
  | Multiplication
  | Division
  | Modulo
  | BitwiseAnd
  | BitwiseOr
  | BitwiseXor
  | CompareLessThan
  | CompareLessOrEqual
  | CompareGreaterThan
  | CompareGreaterOrEqual
  | CompareEqual
  | CompareNotEqual
  | And
  | Or
  | NameResolution
  deriving (Show, Eq)

data UnaryOperator
  = Not
  | Minus
  deriving (Show, Eq)

data Expression
  = IntegerLiteral Int
  | CharacterLiteral Char
  | BooleanLiteral Bool
  | NullLiteral
  | Reference Identifier
  | LocalVariable Identifier
  | FieldVariable Identifier
  | BinaryOperation BinaryOperator Expression Expression
  | UnaryOperation UnaryOperator Expression
  | StatementExpressionExpression StatementExpression
  | TypedExpression DataType Expression
  deriving (Show, Eq)