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(*  Abstract syntax as produced by the parsed *)

open Location
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open Ident
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type pprog = pmodule_item list

and pmodule_item = pmodule_item' located
and pmodule_item' =
  | TypeDecl of string * ppat
  | PatDecl of string * ppat
  | FunDecl of abstr
  | LetDecl of ppat * pexpr
  | EvalStatement of pexpr
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  | Debug of debug_directive
and debug_directive =
  [ `Filter of ppat * ppat
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  | `Sample of ppat
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  | `Accept of ppat
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  | `Compile of ppat * ppat list 
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  | `Subtype of ppat * ppat
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  ]
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and pexpr = 
  | LocatedExpr of loc * pexpr

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  | Forget of pexpr * ppat    
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  (* CDuce is a Lambda-calculus ... *)
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  | Var of id
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  | Apply of pexpr * pexpr
  | Abstraction of abstr
      
  (* Data constructors *)
  | Cst of Types.const
  | Pair of pexpr * pexpr
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  | Xml of pexpr * pexpr
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  | RecordLitt of pexpr label_map
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  (* Data destructors *)
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  | Op of string * pexpr list
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  | Match of pexpr * branches
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  | Map of bool * pexpr * branches
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  | Xtrans of pexpr * branches
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  | Dot of pexpr* label
  | RemoveField of pexpr * label
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  (* Exceptions *)
  | Try of pexpr * branches

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and abstr = { 
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  fun_name : id option; 
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  fun_iface : (ppat * ppat) list;
  fun_body : branches
}

and branches = (ppat * pexpr) list
    
(* A common syntactic class for patterns and types *) 

and ppat = ppat' located
and ppat' =
  | PatVar of string
  | Recurs of ppat * (string * ppat) list
  | Internal of Types.descr
  | Or of ppat * ppat
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  | And of ppat * ppat
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  | Diff of ppat * ppat
  | Prod of ppat * ppat
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  | XmlT of ppat * ppat
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  | Arrow of ppat * ppat
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  | Optional of ppat
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  | Record of bool * ppat label_map
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  | Capture of id
  | Constant of id * Types.const
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  | Regexp of regexp * ppat

and regexp =
  | Epsilon
  | Elem of ppat
  | Seq of regexp * regexp
  | Alt of regexp * regexp
  | Star of regexp
  | WeakStar of regexp
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  | SeqCapture of id * regexp