(* $Id$ *)

open Pp
open Util
open Names
open Sign
open Term
open Environ
open Evd
open Reduction
open Impargs
open Rawterm
open Pattern
open Typing
open Pretyping
open Evarutil
open Ast
open Coqast
open Pretype_errors

(*Takes a list of variables which must not be globalized*)
let from_list l = List.fold_right Idset.add l Idset.empty

(* when an head ident is not a constructor in pattern *)
let mssg_hd_is_not_constructor s =
  [< 'sTR ("The symbol "^s^" should be a constructor") >]

(* checking linearity of a list of ids in patterns *)
let non_linearl_mssg id =
  [< 'sTR "The variable " ; 'sTR(string_of_id id);
     'sTR " is bound several times in pattern" >] 

let rec has_duplicate = function 
  | [] -> None
  | x::l -> if List.mem x l then (Some x) else has_duplicate l

let check_linearity loc ids =
  match has_duplicate ids with
    | Some id -> user_err_loc (loc,"ast_to_eqn",non_linearl_mssg id)
    | None -> ()

let mal_formed_mssg () =
  [<'sTR "malformed macro of multiple case" >]

(* determines if some pattern variable starts with uppercase *)
let warning_uppercase loc uplid = (* Comment afficher loc ?? *)
  let vars =
    prlist_with_sep pr_spc (fun v -> [< 'sTR (string_of_id v) >]) uplid in
  let (s1,s2) = if List.length uplid = 1 then (" ","s ") else ("s "," ") in
  wARN [<'sTR ("the variable"^s1); vars;
	 'sTR (" start"^s2^"with an upper case letter in pattern") >]

let is_uppercase_var v =
 match (string_of_id v).[0] with
    'A'..'Z' -> true
 | _  -> false

let check_uppercase loc ids =
  let uplid = List.filter is_uppercase_var ids in
  if uplid <> [] then warning_uppercase loc uplid

(* check that the number of pattern matches the number of matched args *)
let mssg_number_of_patterns n pl =
  [< 'sTR"Expecting ";'iNT n ; 'sTR" pattern(s) but found ";
    'iNT (List.length pl); 'sTR" in " >]

let check_number_of_pattern loc n l =
  if n<>(List.length l) then
    user_err_loc (loc,"check_number_of_pattern",mssg_number_of_patterns n l)

(****************************************************************)
(* Arguments normally implicit in the "Implicit Arguments mode" *)
(* but explicitely given                                        *)

let ast_to_sp = function
  | Path(loc,sl,s) ->
      (try 
	 section_path sl s
       with Invalid_argument _ | Failure _ ->
         anomaly_loc(loc,"Astterm.ast_to_sp",
                     [< 'sTR"malformed section-path" >]))
  | ast -> anomaly_loc(Ast.loc ast,"Astterm.ast_to_sp",
                     [< 'sTR"not a section-path" >])

let is_underscore id = (id = "_")

let name_of_nvar s =
  if is_underscore s then Anonymous else Name (id_of_string s)

let ident_of_nvar loc s =
  if is_underscore s then
    user_err_loc (loc,"ident_of_nvar", [< 'sTR "Unexpected wildcard" >])
  else (id_of_string s)

let ids_of_ctxt ctxt =
  Array.to_list
    (Array.map
       (function c -> match kind_of_term c with
	  | IsVar id -> id
	  | _ ->
      error
	"Astterm: arbitrary substitution of references not yet implemented")
    ctxt)

let maybe_constructor env s =
  try 
    match kind_of_term (Declare.global_reference CCI (id_of_string s)) with 
      | IsMutConstruct ((spi,j),cl) -> Some ((spi,j),ids_of_ctxt cl)
      | _ -> warning ("Defined identifier "
		      ^s^" is here considered as a matching variable"); None
  with Not_found -> 
    None

let ast_to_ctxt ctxt =
  let l =
    List.map
      (function
	 | Nvar (loc,s) ->
	     (* RRef (dummy_loc,RVar (ident_of_nvar loc s)) *)
	     RRef (loc, RVar (ident_of_nvar loc s))
	 | _ -> anomaly "Bad ast for local ctxt of a global reference") ctxt
  in
  Array.of_list l

let ast_to_constr_ctxt =
  Array.map
    (function c -> match kind_of_term c with
       | IsVar id ->
	   (* RRef (dummy_loc,RVar (ident_of_nvar loc s)) *)
	   RRef (dummy_loc, RVar id)
       | _ -> anomaly "Bad ast for local ctxt of a global reference")

let ast_to_rawconstr_ctxt =
  Array.map
    (function
       | RRef (_, RVar id) -> mkVar id
       | _ -> anomaly "Bad ast for local ctxt of a global reference")

let ast_to_global loc = function
  | ("CONST", sp::ctxt) -> 
      RRef (loc,RConst (ast_to_sp sp,ast_to_ctxt ctxt))
  | ("EVAR", (Num (_,ev))::ctxt) ->
      RRef (loc,REVar (ev,ast_to_ctxt ctxt))
  | ("MUTIND", sp::Num(_,tyi)::ctxt) -> 
      RRef (loc,RInd ((ast_to_sp sp, tyi),ast_to_ctxt ctxt))
  | ("MUTCONSTRUCT", sp::Num(_,ti)::Num(_,n)::ctxt) ->
      RRef (loc,RConstruct (((ast_to_sp sp,ti),n),ast_to_ctxt ctxt))
  | _ -> anomaly_loc (loc,"ast_to_global",
		      [< 'sTR "Bad ast for this global a reference">])

let ref_from_constr c = match kind_of_term c with
  | IsConst (sp,ctxt) -> RConst (sp, ast_to_constr_ctxt ctxt)
  | IsEvar (ev,ctxt) -> REVar (ev, ast_to_constr_ctxt ctxt) 
  | IsMutConstruct (csp,ctxt) -> RConstruct (csp, ast_to_constr_ctxt ctxt)
  | IsMutInd (isp,ctxt) -> RInd (isp, ast_to_constr_ctxt ctxt)
  | IsVar id -> RVar id  (* utilisé pour coe_value (tmp) *)
  | _ -> anomaly "Not a reference"

(* [vars1] is a set of name to avoid (used for the tactic language);
   [vars2] is the set of global variables, env is the set of variables
   abstracted until this point *)
let ast_to_ref sigma env loc s (vars1,vars2)=
  let id = ident_of_nvar loc s in
  if Idset.mem id env then
    RRef (loc,RVar id),[]
  else
  if List.mem s vars1 then
    RRef(loc,RVar id),[]
  else
  try
    let _ = lookup_id id vars2 in
    RRef (loc,RVar id), (try implicits_of_var id with _ -> [])
  with Not_found ->
  try 
    let c,il = Declare.global_reference_imps CCI id in
    RRef (loc,ref_from_constr c), il
  with Not_found ->
  try 
    (Syntax_def.search_syntactic_definition id, [])
  with Not_found -> 
    error_var_not_found_loc loc CCI id
	  
let mkLambdaC (x,a,b) = ope("LAMBDA",[a;slam(Some (string_of_id x),b)])
let mkLambdaCit = List.fold_right (fun (x,a) b -> mkLambdaC(x,a,b))
let mkProdC (x,a,b) = ope("PROD",[a;slam(Some (string_of_id x),b)])
let mkProdCit = List.fold_right (fun (x,a) b -> mkProdC(x,a,b))

let destruct_binder = function
  | Node(_,"BINDER",c::idl) ->
      List.map (fun id -> (id_of_string (nvar_of_ast id),c)) idl
  | _ -> anomaly "BINDER is expected"

let merge_aliases p = function
  | a, Anonymous    -> a, p
  | Anonymous, a    -> a, p
  | Name id1, (Name id2 as na) ->
      let s1 = string_of_id id1 in
      let s2 = string_of_id id2 in
      warning ("Alias variable "^s1^" is merged with "^s2);
      na, replace_var_ast s1 s2 p

let rec ast_to_pattern env aliasopt = function
  | Node(_,"PATTAS",[Nvar (loc,s); p]) ->
      let aliasopt',p' = merge_aliases p (aliasopt,name_of_nvar s) in
      ast_to_pattern env aliasopt' p'
  | Nvar(loc,s) ->
      (match maybe_constructor env s with
	 | Some c ->
	     let ids = match aliasopt with Anonymous -> [] | Name id -> [id] in
	     (ids,PatCstr (loc,c,[],aliasopt))
	 | None ->
	     (match name_of_nvar s with
		| Anonymous -> ([], PatVar (loc,Anonymous))
		| Name id as name -> ([id], PatVar (loc,name))))
  | Node(_,"PATTCONSTRUCT", Nvar(loc,s)::((_::_) as pl)) ->
      (match maybe_constructor env s with
	 | Some c ->
	     let ids = match aliasopt with Anonymous -> [] | Name id -> [id] in
	     let (idsl,pl') = 
	       List.split (List.map (ast_to_pattern env Anonymous) pl) in
	     (List.flatten (ids::idsl),PatCstr (loc,c,pl',aliasopt))
	 | None ->
	     user_err_loc (loc,"ast_to_pattern",mssg_hd_is_not_constructor s))
  | _ -> anomaly "ast_to_pattern: badly-formed ast for Cases pattern"

let rec ast_to_fix = function
  | [] -> ([],[],[],[])
  | Node(_,"NUMFDECL", [Nvar(_,fi); Num(_,ni); astA; astT])::rest ->
      let (lf,ln,lA,lt) = ast_to_fix rest in
      ((id_of_string fi)::lf, (ni-1)::ln, astA::lA, astT::lt)
  | Node(_,"FDECL", [Nvar(_,fi); Node(_,"BINDERS",bl); astA; astT])::rest ->
      let binders = List.flatten (List.map destruct_binder bl) in
      let ni = List.length binders - 1 in
      let (lf,ln,lA,lt) = ast_to_fix rest in
      ((id_of_string fi)::lf, ni::ln, (mkProdCit binders astA)::lA,
       (mkLambdaCit binders astT)::lt)
  | _ -> anomaly "FDECL or NUMFDECL is expected"

let rec ast_to_cofix = function
  | [] -> ([],[],[])
  | Node(_,"CFDECL", [Nvar(_,fi); astA; astT])::rest -> 
      let (lf,lA,lt) = ast_to_cofix rest in
      ((id_of_string fi)::lf, astA::lA, astT::lt)
  | _ -> anomaly "CFDECL is expected"

let error_fixname_unbound str is_cofix loc name = 
  user_err_loc 
    (loc,"ast_to (COFIX)",
       [< 'sTR "The name"; 'sPC ; 'sTR name ; 
	  'sPC ; 'sTR "is not bound in the corresponding"; 'sPC ;
	  'sTR ((if is_cofix then "co" else "")^"fixpoint definition") >])
(*
let rec collapse_env n env = if n=0 then env else
  add_rel_decl (Anonymous,()) (collapse_env (n-1) (snd (uncons_rel_env env)))
*)

let check_capture s ty = function
  | Slam _ when occur_var_ast s ty ->
      errorlabstrm "check_capture"
	[< 'sTR ("The variable "^s^" occurs in its type") >]
  | _ -> ()

let ast_to_rawconstr sigma env allow_soapp lvar =
  let rec dbrec env = function
    | Nvar(loc,s) -> fst (ast_to_ref sigma env loc s lvar)
	  
    | Node(loc,"FIX", (Nvar (locid,iddef))::ldecl) ->
	let (lf,ln,lA,lt) = ast_to_fix ldecl in
	let n =
	  try 
	    (list_index (ident_of_nvar locid iddef) lf) -1
          with Not_found ->
	    error_fixname_unbound "ast_to_rawconstr (FIX)" false locid iddef in
	let ext_env =
	  List.fold_left (fun env fid -> Idset.add fid env) env lf in
	let defl = Array.of_list (List.map (dbrec ext_env) lt) in
	let arityl = Array.of_list (List.map (dbrec env) lA) in
	RRec (loc,RFix (Array.of_list ln,n), Array.of_list lf, arityl, defl)
	  
    | Node(loc,"COFIX", (Nvar(locid,iddef))::ldecl) ->
	let (lf,lA,lt) = ast_to_cofix ldecl in
	let n =
          try 
	    (list_index (ident_of_nvar locid iddef) lf) -1
          with Not_found ->
	    error_fixname_unbound "ast_to_rawconstr (COFIX)" true locid iddef in
	let ext_env =
	  List.fold_left (fun env fid -> Idset.add fid env) env lf in
	let defl = Array.of_list (List.map (dbrec ext_env) lt) in
	let arityl = Array.of_list (List.map (dbrec env) lA) in
	RRec (loc,RCoFix n, Array.of_list lf, arityl, defl)
	  
    | Node(loc,("PROD"|"LAMBDA"|"LETIN" as k), [c1;Slam(_,ona,c2)]) ->
	let na,env' = match ona with
	  | Some s -> let id = id_of_string s in Name id, Idset.add id env
	  | _ -> Anonymous, env in
	let kind = match k with
	  | "PROD" -> BProd
	  | "LAMBDA" -> BLambda
	  | "LETIN" -> BLetIn
	  | _ -> assert false in
	RBinder(loc, kind, na, dbrec env c1, dbrec env' c2)

    | Node(_,"PRODLIST", [c1;(Slam _ as c2)]) -> 
	iterated_binder BProd 0 c1 env c2
    | Node(_,"LAMBDALIST", [c1;(Slam _ as c2)]) -> 
	iterated_binder BLambda 0 c1 env c2

    | Node(loc,"APPLISTEXPL", f::args) ->
	RApp (loc,dbrec env f,List.map (dbrec env) args)
    | Node(loc,"APPLIST", Nvar(locs,s)::args) ->
	let (c, impargs) = ast_to_ref sigma env locs s lvar
        in
	  RApp (loc, c, ast_to_args env impargs args)
    | Node(loc,"APPLIST", f::args) ->	   
	RApp (loc,dbrec env f,List.map (dbrec env) args)
	  
    | Node(loc,"CASES", p:: Node(_,"TOMATCH",tms):: eqns) ->
	let po = match p with 
	  | Str(_,"SYNTH") -> None 
	  | _ -> Some(dbrec env p) in
	RCases (loc,PrintCases,po,
		List.map (dbrec env) tms,
		List.map (ast_to_eqn (List.length tms) env) eqns)

    | Node(loc,"CASE",Str(_,isrectag)::p::c::cl) ->
	let po = match p with 
	  | Str(_,"SYNTH") -> None 
	  | _ -> Some(dbrec env p) in
	let isrec = match isrectag with
	  | "REC" -> true | "NOREC" -> false 
	  | _ -> anomaly "ast_to: wrong REC tag in CASE" in
	ROldCase (loc,isrec,po,dbrec env c,
		  Array.of_list (List.map (dbrec env) cl))

    | Node(loc,"ISEVAR",[]) -> RHole (Some loc)
    | Node(loc,"META",[Num(_,n)]) ->
	if n<0 then error "Metavariable numbers must be positive"
	else RMeta (loc, n)

    | Node(loc,"PROP", []) -> RSort(loc,RProp Null)
    | Node(loc,"SET", [])  -> RSort(loc,RProp Pos)
    | Node(loc,"TYPE", []) -> RSort(loc,RType)
	  
    (* This case mainly parses things build from   in a quotation *)
    | Node(loc,("CONST"|"EVAR"|"MUTIND"|"MUTCONSTRUCT"|"SYNCONST" as key),l) ->
	ast_to_global loc (key,l)

    | Node(loc,"CAST", [c1;c2]) ->	   
	RCast (loc,dbrec env c1,dbrec env c2)

    | Node(loc,"SOAPP", args) when allow_soapp ->
	(match List.map (dbrec env) args with
           (* Hack special pour l'interprétation des constr_pattern *)
	   | RMeta (locn,n) :: args -> RApp (loc,RMeta (locn,- n), args)
	   | RHole _ :: _ -> anomaly "Metavariable for 2nd-order pattern-matching cannot be anonymous"
	   | _ -> anomaly "Bad arguments for second-order pattern-matching")

    | Node(loc,opn,tl) -> 
	anomaly ("ast_to_rawconstr found operator "^opn^" with "^
		 (string_of_int (List.length tl))^" arguments")

    | _ -> anomaly "ast_to_rawconstr: unexpected ast"

  and ast_to_eqn n env = function
    | Node(loc,"EQN",rhs::lhs) ->
	let (idsl,pl) =
	  List.split (List.map (ast_to_pattern env Anonymous) lhs) in
	let ids = List.flatten idsl in
	(* Linearity implies the order in ids is irrelevant *)
	check_linearity loc ids;
	check_uppercase loc ids;
	check_number_of_pattern loc n pl;
	let env' =
	  List.fold_left (fun env id -> Idset.add id env) env ids in
	(ids,pl,dbrec env' rhs)
    | _ -> anomaly "ast_to_rawconstr: badly-formed ast for Cases equation"

  and iterated_binder oper n ty env = function
    | Slam(loc,ona,body) ->
	let na,env' = match ona with 
	  | Some s ->
	      if n>0 then check_capture s ty body;
	      let id = id_of_string s in Name id, Idset.add id env
	  | _ -> Anonymous, env
	in
	RBinder(loc, oper, na, dbrec env ty,
		(iterated_binder oper (n+1) ty env' body))
    | body -> dbrec env body

  and ast_to_args env l args =
    let rec aux n l args = match (l,args) with 
      | (i::l',Node(loc, "EXPL", [Num(_,j);a])::args') ->
	  if i=n & j>=i then
	    if j=i then 
	      (dbrec env a)::(aux (n+1) l' args')
	    else 
	      (RHole None)::(aux (n+1) l' args)
	  else 
	    if i<>n then
	      error ("Bad explicitation number: found "^
		   (string_of_int j)^" but was expecting a regular argument")
	    else
	      error ("Bad explicitation number: found "^
		   (string_of_int j)^" but was expecting "^(string_of_int i))
      | (i::l',a::args') -> 
	  if i=n then 
	    (RHole None)::(aux (n+1) l' args)
	  else 
	    (dbrec env a)::(aux (n+1) l args')
      | ([],args) -> List.map (dbrec env) args
      | (_,[]) -> []
    in 
    aux 1 l args

  in 
  dbrec env

(**************************************************************************)
(* Globalization of AST quotations (mainly used to get statically         *)
(* bound idents in grammar or pretty-printing rules)                      *)
(**************************************************************************)

let ast_adjust_consts sigma =
  let rec dbrec env =
    function
      Nvar (loc, s) as ast ->
        let id = id_of_string s in
        if isMeta s then ast
        else if Idset.mem id env then ast
        else
          begin try
            match kind_of_term (Declare.global_reference Names.CCI id) with
              IsConst (sp, _) -> Node (loc, "CONST", [path_section loc sp])
            | IsEvar (ev, _) -> Node (loc, "EVAR", [Num (loc, ev)])
            | IsMutConstruct (((sp, i), j), _) ->
                Node
                  (loc, "MUTCONSTRUCT", [path_section loc sp; num i; num j])
            | IsMutInd ((sp, i), _) ->
                Node (loc, "MUTIND", [path_section loc sp; num i])
            | _ -> anomaly "Not a reference"
          with
            UserError _ | Not_found ->
              try
                let _ = Syntax_def.search_syntactic_definition id in
                Node (loc, "SYNCONST", [Nvar (loc, s)])
              with
                Not_found -> warning ("Could not globalize " ^ s); ast
          end
    | Slam (loc, None, t) -> Slam (loc, None, dbrec env t)
    | Slam (loc, Some na, t) ->
        let env' = Idset.add (id_of_string na) env in
        Slam (loc, Some na, dbrec env' t)
    | Node (loc, opn, tl) -> Node (loc, opn, List.map (dbrec env) tl)
    | x -> x
  in
  dbrec

let globalize_constr ast =
  let sign = Global.named_context () in
  ast_adjust_consts Evd.empty (from_list (ids_of_named_context sign)) ast

(* Globalizes ast expressing constructions in tactics or vernac *)
(* Actually, it is incomplete, see vernacinterp.ml and tacinterp.ml *)
(* Used mainly to parse Grammar and Syntax expressions *)
let rec glob_ast sigma env =
  function
    Node (loc, "CONSTR", [c]) ->
      Node (loc, "CONSTR", [ast_adjust_consts sigma env c])
  | Node (loc, "CONSTRLIST", l) ->
      Node (loc, "CONSTRLIST", List.map (ast_adjust_consts sigma env) l)
  | Slam (loc, None, t) -> Slam (loc, None, glob_ast sigma env t)
  | Slam (loc, Some na, t) ->
      let env' = Idset.add (id_of_string na) env in
      Slam (loc, Some na, glob_ast sigma env' t)
  | Node (loc, opn, tl) -> Node (loc, opn, List.map (glob_ast sigma env) tl)
  | x -> x

let globalize_ast ast =
  let sign = Global.named_context () in
  glob_ast Evd.empty (from_list (ids_of_named_context sign)) ast

(**************************************************************************)
(* Functions to translate ast into rawconstr                              *)
(**************************************************************************)

let interp_rawconstr_gen sigma env allow_soapp lvar com =
  ast_to_rawconstr sigma
    (from_list (ids_of_rel_context (rel_context env)))
    allow_soapp (lvar,named_context env) com

let interp_rawconstr sigma env com =
  interp_rawconstr_gen sigma env false [] com

(*The same as interp_rawconstr but with a list of variables which must not be
  globalized*)

let interp_rawconstr_wo_glob sigma env lvar com =
  ast_to_rawconstr sigma
    (from_list (ids_of_rel_context (rel_context env)))
    false (lvar,named_context env) com

(*let raw_fconstr_of_com sigma env com =
  ast_to_fw sigma (unitize_env (context env)) [] com

let raw_constr_of_compattern sigma env com = 
  ast_to_cci sigma (unitize_env env) com*)

(*********************************************************************)
(* V6 compat: Functions before in ex-trad                            *)

(* Functions to parse and interpret constructions *)

let interp_constr sigma env c =
  understand sigma env (interp_rawconstr sigma env c)

let interp_openconstr sigma env c =
  understand_gen_tcc sigma env [] [] None (interp_rawconstr sigma env c)

let interp_casted_openconstr sigma env c typ =
  understand_gen_tcc sigma env [] [] (Some typ) (interp_rawconstr sigma env c)

let interp_type sigma env   c =
  understand_type sigma env (interp_rawconstr sigma env c)

let interp_sort = function
  | Node(loc,"PROP", []) -> Prop Null
  | Node(loc,"SET", [])  -> Prop Pos
  | Node(loc,"TYPE", []) -> Type Univ.dummy_univ
  | a -> user_err_loc (Ast.loc a,"interp_sort", [< 'sTR "Not a sort" >])

let judgment_of_rawconstr sigma env c =
  understand_judgment sigma env (interp_rawconstr sigma env c)

let type_judgment_of_rawconstr sigma env c =
  understand_type_judgment sigma env (interp_rawconstr sigma env c)

(*To retype a list of key*constr with undefined key*)
let retype_list sigma env lst=
  List.map (fun (x,csr) -> (x,Retyping.get_judgment_of env sigma csr)) lst;;

(*Interprets a constr according to two lists of instantiations (variables and
  metas)*)
(* Note: typ is retyped *)
let interp_constr_gen sigma env lvar lmeta com exptyp =
  let c =
    interp_rawconstr_gen sigma env false (List.map (fun x -> string_of_id (fst
      x)) lvar) com
  and rtype=fun lst -> retype_list sigma env lst in
  understand_gen sigma env (rtype lvar) (rtype lmeta) exptyp c;;

(*Interprets a casted constr according to two lists of instantiations
  (variables and metas)*)
let interp_openconstr_gen sigma env lvar lmeta com exptyp =
  let c =
    interp_rawconstr_gen sigma env false (List.map (fun x -> string_of_id (fst
      x)) lvar) com
  and rtype=fun lst -> retype_list sigma env lst in
  understand_gen_tcc sigma env (rtype lvar) (rtype lmeta) exptyp c;;


let interp_casted_constr sigma env com typ = 
  understand_gen sigma env [] [] (Some typ) (interp_rawconstr sigma env com)

(* To process patterns, we need a translation from AST to term
   without typing at all. *)

let ctxt_of_ids ids = Array.of_list (List.map mkVar ids)

let rec pat_of_ref metas vars = function
  | RConst (sp,ctxt) -> RConst (sp, ast_to_rawconstr_ctxt ctxt)
  | RInd (ip,ctxt) -> RInd (ip, ast_to_rawconstr_ctxt ctxt)
  | RConstruct(cp,ctxt) ->RConstruct(cp, ast_to_rawconstr_ctxt ctxt)
  | REVar (n,ctxt) -> REVar (n, ast_to_rawconstr_ctxt ctxt)
  | RVar _ -> assert false (* Capturé dans pattern_of_raw *)

and pat_of_raw metas vars lvar = function
  | RRef (_,RVar id) -> 
      (try PRel (list_index (Name id) vars)
       with Not_found ->
         (try (List.assoc id lvar)
          with Not_found -> PRef (RVar id)))
  | RMeta (_,n) ->
      metas := n::!metas; PMeta (Some n)
  | RRef (_,r) ->
      PRef (pat_of_ref metas vars r)
  (* Hack pour ne pas réécrire une interprétation complète des patterns*)
  | RApp (_, RMeta (_,n), cl) when n<0 ->
      PSoApp (- n, List.map (pat_of_raw metas vars lvar) cl)
  | RApp (_,c,cl) -> 
      PApp (pat_of_raw metas vars lvar c,
	    Array.of_list (List.map (pat_of_raw metas vars lvar) cl))
  | RBinder (_,bk,na,c1,c2) ->
      PBinder (bk, na, pat_of_raw metas vars lvar c1,
	       pat_of_raw metas (na::vars) lvar c2)
  | RSort (_,s) ->
      PSort s
  | RHole _ ->
      PMeta None
  | RCast (_,c,t) ->
      warning "Cast not taken into account in constr pattern";
      pat_of_raw metas vars lvar c
  | ROldCase (_,false,po,c,br) ->
      PCase (option_app (pat_of_raw metas vars lvar) po,
             pat_of_raw metas vars lvar c,
             Array.map (pat_of_raw metas vars lvar) br)
  | _ ->
      error "pattern_of_rawconstr: not implemented"

let pattern_of_rawconstr lvar c =
  let metas = ref [] in
  let p = pat_of_raw metas [] lvar c in
  (!metas,p)

let interp_constrpattern_gen sigma env lvar com = 
  let c =
    ast_to_rawconstr sigma (from_list (ids_of_rel_context (rel_context env)))
      true (List.map
	      (fun x ->
		 string_of_id (fst x)) lvar,named_context env) com
  and nlvar = List.map (fun (id,c) -> (id,pattern_of_constr c)) lvar in
  try 
    pattern_of_rawconstr nlvar c
  with e -> 
    Stdpp.raise_with_loc (Ast.loc com) e

let interp_constrpattern sigma env com =
  interp_constrpattern_gen sigma env [] com