class StatementNode {
    enum Kind {
        case IFELSE, FOR, WHILE, BLOCK
    }

    var text: String
    var kind: Kind
    var position:(col: Int, row: Int)

    init(_ position: (Int, Int),_ kind: Kind,_ text: String) {
        self.text = text
        self.position = position
        self.kind = kind
    }
}

class DeclType {
    enum declType {
        case VAR, TYPE, CONST
    }
    var type: declType
    var text: String
    var position:(col: Int, row: Int)
    init(_ position: (Int, Int),_ text: String, _ type:declType) {
        self.type = type
        self.text = text
        self.position = position
    }
}

class VarType: DeclType {
    init(_ position: (Int, Int), _ text: String) {
        super.init(position, text, .VAR)
    }
}

class DeclarationScope {
    var declList = [String: DeclType]()
}

class Block: StatementNode {
    var declScope: DeclarationScope?
    var stmtList = [StatementNode]()
    init(_ position: (Int, Int),_ text: String,_ declaration:DeclarationScope? = nil) {
        self.declScope = declaration
        super.init(position, .BLOCK, text)
    }
}

class IFElseStmt: StatementNode {
    var condition: Expression
    var block: StatementNode
    var elseBlock: StatementNode?
    init(_ position: (Int, Int),_ text: String,_ cond: Expression,_ block: StatementNode,_ elseBlock:StatementNode? = nil) {
        self.condition = cond
        self.block = block
        self.elseBlock = elseBlock
        super.init(position, .IFELSE, text)
    }
}