module PascalUnitSyntaxTree where

data PascalUnit =

    Program Identifier Implementation Phrase

    | Unit Identifier Interface Implementation (Maybe Initialize) (Maybe Finalize)

    | System [TypeVarDeclaration]

    | Redo [TypeVarDeclaration]

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data Interface = Interface Uses TypesAndVars

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data Implementation = Implementation Uses TypesAndVars

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data Identifier = Identifier String BaseType

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data TypesAndVars = TypesAndVars [TypeVarDeclaration]

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data TypeVarDeclaration = TypeDeclaration Identifier TypeDecl

    | VarDeclaration Bool Bool ([Identifier], TypeDecl) (Maybe InitExpression)

    | FunctionDeclaration Identifier Bool Bool Bool TypeDecl [TypeVarDeclaration] (Maybe (TypesAndVars, Phrase))

    | OperatorDeclaration String Identifier Bool TypeDecl [TypeVarDeclaration] (Maybe (TypesAndVars, Phrase))

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data TypeDecl = SimpleType Identifier

    | RangeType Range

    | Sequence [Identifier]

    | ArrayDecl (Maybe Range) TypeDecl

    | RecordType [TypeVarDeclaration] (Maybe [[TypeVarDeclaration]])

    | PointerTo TypeDecl

    | String

    | AString

    | Set TypeDecl

    | FunctionType TypeDecl [TypeVarDeclaration]

    | DeriveType InitExpression

    | VoidType

    | VarParamType TypeDecl -- this is a hack

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data Range = Range Identifier

           | RangeFromTo InitExpression InitExpression

           | RangeInfinite

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data Initialize = Initialize String

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data Finalize = Finalize String

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data Uses = Uses [Identifier]

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data Phrase = ProcCall Reference [Expression]

        | IfThenElse Expression Phrase (Maybe Phrase)

        | WhileCycle Expression Phrase

        | RepeatCycle Expression [Phrase]

        | ForCycle Identifier Expression Expression Phrase Bool -- The last Boolean indicates wether it's up or down counting

        | WithBlock Reference Phrase

        | Phrases [Phrase]

        | SwitchCase Expression [([InitExpression], Phrase)] (Maybe [Phrase])

        | Assignment Reference Expression

        | BuiltInFunctionCall [Expression] Reference

        | NOP

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data Expression = Expression String

    | BuiltInFunCall [Expression] Reference

    | PrefixOp String Expression

    | PostfixOp String Expression

    | BinOp String Expression Expression

    | StringLiteral String

    | PCharLiteral String

    | CharCode String

    | HexCharCode String

    | NumberLiteral String

    | FloatLiteral String

    | HexNumber String

    | Reference Reference

    | SetExpression [Identifier]

    | Null

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data Reference = ArrayElement [Expression] Reference

    | FunCall [Expression] Reference

    | TypeCast Identifier Expression

    | SimpleReference Identifier

    | Dereference Reference

    | RecordField Reference Reference

    | Address Reference

    | RefExpression Expression

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data InitExpression = InitBinOp String InitExpression InitExpression

    | InitPrefixOp String InitExpression

    | InitReference Identifier

    | InitArray [InitExpression]

    | InitRecord [(Identifier, InitExpression)]

    | InitFloat String

    | InitNumber String

    | InitHexNumber String

    | InitString String

    | InitPChar String

    | InitChar String

    | BuiltInFunction String [InitExpression]

    | InitSet [InitExpression]

    | InitAddress InitExpression

    | InitNull

    | InitRange Range

    | InitTypeCast Identifier InitExpression

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data BaseType = BTUnknown

    | BTChar

    | BTString

    | BTAString

    | BTInt Bool -- second param indicates whether signed or not

    | BTBool

    | BTFloat

    | BTRecord String [(String, BaseType)]

    | BTArray Range BaseType BaseType

    | BTFunction Bool Bool [(Bool, BaseType)] BaseType -- in (Bool, BaseType), Bool indiciates whether var or not

    | BTPointerTo BaseType

    | BTUnresolved String

    | BTSet BaseType

    | BTEnum [String]

    | BTVoid

    | BTUnit

    | BTVarParam BaseType

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