class - Parsing list of case classes -

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I am quite new in Scala and I want to parse a list of case sections: 

 D: Class Class D2 (C: String, D: IT) D Case Class D3 (E: IIT, F: String) enhances D Case Class D4E: String, F: String, G: IT) Expand D   
 I want to parse an example of the listing [D]. A special order has been given in the list which can be explained by signaling like BNF:  
  Representative (D0 -> D4 -> Representative (D2 - & gt; After OP (Representative (D3) D) 1-ND2 after D4, after each D2 1-ND3 and so on ...  
 I want to type To create a list of:  
  type T0 = (D0, D4, list [(D2, list [D3])])   
 All solutions I have found so far ugly and polite   
 
 
 This is a ' = (D2, list [D3]) // Matching if in the list (D: D) :: (D4: D4) :: tail = & gt; ; Val (D2D3S, Tail 1) = Matchdie 2D3S (tail) (D, D4, D2D3S) :: Matchlist (Tail 1) Case Neal = & gt; Nil} DIF Match D2D3S (L: List [D]): (List [T1], List [D] = L Match {Case (D2: D2) :: Tail => Val (d3s, Tail1) = tail.span (_.InstanceOf [D3]) Val (Other D2D3S, Tail 2) = Matchdie 2D3S (Tail 1) ((D2, D3S) :: Other D2 D3S, Tail 2) Case L = & gt; (Nil, L) / Any D2S}

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