(*  Abstract syntax as produced by the parsed *)

open Location
open Ident

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
  | Debug of debug_directive
and debug_directive =
  [ `Filter of ppat * ppat
  | `Sample of ppat
  | `Accept of ppat
  | `Compile of ppat * ppat list 
  | `Subtype of ppat * ppat
  ]


and pexpr = 
  | LocatedExpr of loc * pexpr

  | Forget of pexpr * ppat    

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

  (* Exceptions *)
  | Try of pexpr * branches

and abstr = { 
  fun_name : id option; 
  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
  | And of ppat * ppat
  | Diff of ppat * ppat
  | Prod of ppat * ppat
  | XmlT of ppat * ppat
  | Arrow of ppat * ppat
  | Optional of ppat
  | Record of bool * ppat label_map
  | Capture of id
  | Constant of id * Types.const
  | Regexp of regexp * ppat

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