(************************************************************************)
(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
(* <O___,, * CNRS-Ecole Polytechnique-INRIA Futurs-Universite Paris Sud *)
(*   \VV/  **************************************************************)
(*    //   *      This file is distributed under the terms of the       *)
(*         *       GNU Lesser General Public License Version 2.1        *)
(************************************************************************)

(* $Id$ *)

open Pp
open Util
open Names
open Topconstr
open Vernacexpr
open Pcoq
open Tactic
open Decl_kinds
open Genarg
open Extend
open Ppextend
open Goptions

open Prim
open Constr
open Vernac_
open Module

let vernac_kw = [ ";"; ","; ">->"; ":<"; "<:"; "where"; "at" ]
let _ = List.iter (fun s -> Lexer.add_token ("",s)) vernac_kw

(* Rem: do not join the different GEXTEND into one, it breaks native *)
(* compilation on PowerPC and Sun architectures *)

let check_command = Gram.Entry.create "vernac:check_command"
let class_rawexpr = Gram.Entry.create "vernac:class_rawexpr"
let thm_token = Gram.Entry.create "vernac:thm_token"
let def_body = Gram.Entry.create "vernac:def_body"

let no_hook _ _ = ()
GEXTEND Gram
  GLOBAL: vernac gallina_ext;
  vernac:
    (* Better to parse "." here: in case of failure (e.g. in coerce_to_var), *)
    (* "." is still in the stream and discard_to_dot works correctly         *)
    [ [ g = gallina; "." -> g 
      | g = gallina_ext; "." -> g
      | c = command; "." -> c 
      | c = syntax; "." -> c
      | "["; l = LIST1 located_vernac; "]"; "." -> VernacList l
    ] ]
  ;
  vernac: FIRST
    [ [ IDENT "Time"; v = vernac  -> VernacTime v ] ]
  ;
  vernac: LAST
    [ [ gln = OPT[n=natural; ":" -> n];
        tac = subgoal_command -> tac gln ] ]
  ;
  subgoal_command:
    [ [ c = check_command; "." -> c
      | tac = Tactic.tactic;
        use_dft_tac = [ "." -> false | "..." -> true ] ->
          (fun g ->
            let g = match g with Some gl -> gl | _ -> 1 in
            VernacSolve(g,tac,use_dft_tac)) ] ]
  ;
  located_vernac:
    [ [ v = vernac -> loc, v ] ]
  ;
END


let test_plurial_form = function
  | [(_,([_],_))] ->
      Options.if_verbose warning
   "Keywords Variables/Hypotheses/Parameters expect more than one assumption"
  | _ -> ()

let no_coercion loc (c,x) =
  if c then Util.user_err_loc
    (loc,"no_coercion",Pp.str"no coercion allowed here");
  x

(* Gallina declarations *)
GEXTEND Gram
  GLOBAL: gallina gallina_ext thm_token def_body;

  gallina:
      (* Definition, Theorem, Variable, Axiom, ... *)
    [ [ thm = thm_token; id = identref; bl = LIST0 binder_let; ":";
        c = lconstr ->
          VernacStartTheoremProof (thm, id, (bl, c), false, no_hook)
      | stre = assumption_token; bl = assum_list -> 
	  VernacAssumption (stre, bl)
      | stre = assumptions_token; bl = assum_list ->
	  test_plurial_form bl;
	  VernacAssumption (stre, bl)
      | IDENT "Boxed";"Definition";id = identref; b = def_body -> 
	  VernacDefinition ((Global,true,Definition), id, b, no_hook)
      | IDENT "Unboxed";"Definition";id = identref; b = def_body -> 
	  VernacDefinition ((Global,false,Definition), id, b, no_hook)
      | (f,d) = def_token; id = identref; b = def_body -> 
          VernacDefinition (d, id, b, f)
      (* Gallina inductive declarations *)
      | f = finite_token;
        indl = LIST1 inductive_definition SEP "with" ->
          VernacInductive (f,indl)
      | IDENT "Boxed";"Fixpoint"; recs = LIST1 rec_definition SEP "with" ->
          VernacFixpoint (recs,true)
      | IDENT "Unboxed";"Fixpoint"; recs = LIST1 rec_definition SEP "with" ->
          VernacFixpoint (recs,false)
       | "Fixpoint"; recs = LIST1 rec_definition SEP "with" ->
          VernacFixpoint (recs,Options.boxed_definitions())
      | "CoFixpoint"; corecs = LIST1 corec_definition SEP "with" ->
          VernacCoFixpoint (corecs,false)
      | IDENT "Scheme"; l = LIST1 scheme SEP "with" -> VernacScheme l ] ]
  ;
  gallina_ext:
    [ [ b = record_token; oc = opt_coercion; name = identref;
        ps = LIST0 binder_let; ":";
	s = lconstr; ":="; cstr = OPT identref; "{";
        fs = LIST0 record_field SEP ";"; "}" ->
	  VernacRecord (b,(oc,name),ps,s,cstr,fs)
(* Non port�é ?
      | f = finite_token; s = csort; id = identref;
        indpar = LIST0 simple_binder; ":="; lc = constructor_list -> 
          VernacInductive (f,[id,None,indpar,s,lc])
*)
    ] ]
  ;
  thm_token:
    [ [ "Theorem" -> Theorem
      | IDENT "Lemma" -> Lemma
      | IDENT "Fact" -> Fact
      | IDENT "Remark" -> Remark
      | IDENT "Corollary" -> Corollary
      | IDENT "Proposition" -> Proposition
      | IDENT "Property" -> Property ] ]
  ;
  def_token:
    [ [ "Definition" -> 
	no_hook, (Global, Options.boxed_definitions(), Definition)
      | IDENT "Let" -> 
	no_hook, (Local, Options.boxed_definitions(), Definition)
      | IDENT "Example" -> 
	no_hook, (Global, Options.boxed_definitions(), Example)
      | IDENT "SubClass"  -> Class.add_subclass_hook, (Global, false, SubClass)
      | IDENT "Local"; IDENT "SubClass"  ->
          Class.add_subclass_hook, (Local, false, SubClass) ] ] 
  ;
  assumption_token:
    [ [ "Hypothesis" -> (Local, Logical)
      | "Variable" -> (Local, Definitional)
      | "Axiom" -> (Global, Logical)
      | "Parameter" -> (Global, Definitional)
      | IDENT "Conjecture" -> (Global, Conjectural) ] ]
  ;
  assumptions_token:
    [ [ IDENT "Hypotheses" -> (Local, Logical)
      | IDENT "Variables" -> (Local, Definitional)
      | IDENT "Axioms" -> (Global, Logical)
      | IDENT "Parameters" -> (Global, Definitional) ] ]
  ;
  finite_token:
    [ [ "Inductive" -> true
      | "CoInductive" -> false ] ]
  ;
  record_token:
    [ [ IDENT "Record" -> true | IDENT "Structure" -> false ] ]
  ;
  (* Simple definitions *)
  def_body:
    [ [ bl = LIST0 binder_let; ":="; red = reduce; c = lconstr ->
      (match c with
          CCast(_,c,k,t) -> DefineBody (bl, red, c, Some t)
        | _ -> DefineBody (bl, red, c, None))
      | bl = LIST0 binder_let; ":"; t = lconstr; ":="; red = reduce; c = lconstr ->
          DefineBody (bl, red, c, Some t)
      | bl = LIST0 binder_let; ":"; t = lconstr ->
          ProveBody (bl, t) ] ]
  ;
  reduce:
    [ [ IDENT "Eval"; r = Tactic.red_expr; "in" -> Some r
      | -> None ] ]
  ;
  decl_notation:
    [ [ OPT [ "where"; ntn = ne_string; ":="; c = constr; 
         scopt = OPT [ ":"; sc = IDENT -> sc] -> (ntn,c,scopt) ] ] ]
    ;
  (* Inductives and records *)
  inductive_definition:
    [ [ id = identref; indpar = LIST0 binder_let; ":"; c = lconstr; 
        ":="; lc = constructor_list; ntn = decl_notation ->
	  (id,ntn,indpar,c,lc) ] ]
  ;
  constructor_list:
    [ [ "|"; l = LIST1 constructor SEP "|" -> l
      | l = LIST1 constructor SEP "|" -> l
      |  -> [] ] ]
  ;
(*
  csort:
    [ [ s = sort -> CSort (loc,s) ] ]
  ;
*)
  opt_coercion:
    [ [ ">" -> true
      |  -> false ] ]
  ;
  (* (co)-fixpoints *)
  rec_definition:
    [ [ id = ident; bl = LIST1 binder_let;
        annot = OPT rec_annotation; type_ = type_cstr; 
	":="; def = lconstr; ntn = decl_notation ->
          let names = List.map snd (names_of_local_assums bl) in
          let ni =
            match annot with
                Some id ->
                  (try list_index (Name id) names - 1
                  with Not_found ->  Util.user_err_loc
                      (loc,"Fixpoint",
                       Pp.str "No argument named " ++ Nameops.pr_id id))
              | None -> 
                  if List.length names > 1 then
                    Util.user_err_loc
                      (loc,"Fixpoint",
                       Pp.str "the recursive argument needs to be specified");
                  0 in
	  ((id, ni, bl, type_, def),ntn) ] ]
  ;
  corec_definition:
    [ [ id = ident; bl = LIST0 binder_let; c = type_cstr; ":=";
        def = lconstr ->
          (id,bl,c ,def) ] ]
  ;
  rec_annotation:
    [ [ "{"; IDENT "struct"; id=IDENT; "}" -> id_of_string id ] ]
  ;
  type_cstr:
    [ [ ":"; c=lconstr -> c 
      | -> CHole loc ] ]
  ;
  (* Inductive schemes *)
  scheme:
    [ [ id = identref; ":="; dep = dep_scheme; "for"; ind = global;
        IDENT "Sort"; s = sort ->
          (id,dep,ind,s) ] ]
  ;
  dep_scheme:
    [ [ IDENT "Induction" -> true
      | IDENT "Minimality" -> false ] ]
  ;
  (* Various Binders *)
(*
  (* ... without coercions *)
  binder_nodef:
    [ [ b = binder_let ->
      (match b with
          LocalRawAssum(l,ty) -> (l,ty)
        | LocalRawDef _ ->
            Util.user_err_loc
              (loc,"fix_param",Pp.str"defined binder not allowed here")) ] ]
  ;
*)
  (* ... with coercions *)
  record_field:
    [ [ id = name -> (false,AssumExpr(id,CHole loc))
      | id = name; oc = of_type_with_opt_coercion; t = lconstr ->
         (oc,AssumExpr (id,t))
      | id = name; oc = of_type_with_opt_coercion;
             t = lconstr; ":="; b = lconstr -> (oc,DefExpr (id,b,Some t))
      | id = name; ":="; b = lconstr ->
         match b with
             CCast(_,b,_,t) -> (false,DefExpr(id,b,Some t))
           | _ -> (false,DefExpr(id,b,None)) ] ]
  ;
  assum_list:
    [ [ bl = LIST1 assum_coe -> bl | b = simple_assum_coe -> [b] ] ]
  ;
  assum_coe:
    [ [ "("; a = simple_assum_coe; ")" -> a ] ]
  ;
  simple_assum_coe:
    [ [ idl = LIST1 identref; oc = of_type_with_opt_coercion; c = lconstr -> 
        (oc,(idl,c)) ] ]
  ;
  constructor:
    [ [ id = identref; l = LIST0 binder_let; 
        coe = of_type_with_opt_coercion; c = lconstr ->
	  (coe,(id,G_constr.mkCProdN loc l c))
      | id = identref; l = LIST0 binder_let ->
	  (false,(id,G_constr.mkCProdN loc l (CHole loc))) ] ]
  ;
  of_type_with_opt_coercion:
    [ [ ":>" -> true
      | ":"; ">" -> true
      | ":" -> false ] ]
  ;
END


(* Modules and Sections *)
GEXTEND Gram
  GLOBAL: gallina_ext module_expr module_type;

  gallina_ext:
    [ [ (* Interactive module declaration *)
        IDENT "Module"; export = export_token; id = identref; 
	bl = LIST0 module_binder; mty_o = OPT of_module_type; 
	mexpr_o = OPT is_module_expr ->
	  VernacDefineModule (export, id, bl, mty_o, mexpr_o)
	  
      | IDENT "Module"; "Type"; id = identref; 
	bl = LIST0 module_binder; mty_o = OPT is_module_type ->
	  VernacDeclareModuleType (id, bl, mty_o)
	  
      | IDENT "Declare"; IDENT "Module"; export = export_token; id = identref; 
	bl = LIST0 module_binder; mty_o = of_module_type ->
	  VernacDeclareModule (export, id, bl, mty_o)
      (* Section beginning *)
      | IDENT "Section"; id = identref -> VernacBeginSection id
      | IDENT "Chapter"; id = identref -> VernacBeginSection id

      (* This end a Section a Module or a Module Type *)
      | IDENT "End"; id = identref -> VernacEndSegment id

      (* Requiring an already compiled module *)
      | IDENT "Require"; export = export_token; specif = specif_token;
        qidl = LIST1 global ->
          VernacRequire (export, specif, qidl)
      | IDENT "Require"; export = export_token; specif = specif_token;
        filename = ne_string -> 
	  VernacRequireFrom (export, specif, filename)
      | IDENT "Import"; qidl = LIST1 global -> VernacImport (false,qidl)
      | IDENT "Export"; qidl = LIST1 global -> VernacImport (true,qidl) ] ]
  ;
  export_token:
    [ [ IDENT "Import" -> Some false
      | IDENT "Export" -> Some true
      |  -> None ] ]
  ;
  specif_token:
    [ [ IDENT "Implementation" -> Some false
      | IDENT "Specification" -> Some true
      |  -> None ] ]
  ;
  of_module_type:
    [ [ ":"; mty = module_type -> (mty, true) 
      | "<:"; mty = module_type -> (mty, false) ] ]
  ;
  is_module_type:
    [ [ ":="; mty = module_type -> mty ] ]
  ;
  is_module_expr:
    [ [ ":="; mexpr = module_expr -> mexpr ] ]
  ;

  (* Module binder  *)
  module_binder:
    [ [ "("; export = export_token; idl = LIST1 identref; ":";
         mty = module_type; ")" -> (export,idl,mty) ] ]
  ;

  (* Module expressions *)
  module_expr:
    [ [ qid = qualid -> CMEident qid
      | me1 = module_expr; me2 = module_expr -> CMEapply (me1,me2)
      | "("; me = module_expr; ")" -> me
(* ... *)
      ] ]
  ;
  with_declaration:
    [ [ "Definition"; fqid = fullyqualid; ":="; c = Constr.lconstr ->
          CWith_Definition (fqid,c)
      | IDENT "Module"; fqid = fullyqualid; ":="; qid = qualid ->
	  CWith_Module (fqid,qid)
      ] ]
  ;
  module_type:
    [ [ qid = qualid -> CMTEident qid
(* ... *)
      | mty = module_type; "with"; decl = with_declaration -> 
	  CMTEwith (mty,decl) ] ]
  ;
END

(* Extensions: implicits, coercions, etc. *)   
GEXTEND Gram
  GLOBAL: gallina_ext;

  gallina_ext:
    [ [ (* Transparent and Opaque *)
        IDENT "Transparent"; l = LIST1 global -> VernacSetOpacity (false, l)
      | IDENT "Opaque"; l = LIST1 global -> VernacSetOpacity (true, l)

      (* Canonical structure *)
      | IDENT "Canonical"; IDENT "Structure"; qid = global ->
	  VernacCanonical qid
      | IDENT "Canonical"; IDENT "Structure"; qid = global; d = def_body ->
          let s = coerce_global_to_id qid in
	  VernacDefinition 
	    ((Global,false,CanonicalStructure),(dummy_loc,s),d,
	     (fun _ -> Recordops.declare_canonical_structure))

      (* Coercions *)
      | IDENT "Coercion"; qid = global; d = def_body ->
          let s = coerce_global_to_id qid in
	  VernacDefinition ((Global,false,Coercion),(dummy_loc,s),d,Class.add_coercion_hook)
      | IDENT "Coercion"; IDENT "Local"; qid = global; d = def_body ->
           let s = coerce_global_to_id qid in
	  VernacDefinition ((Local,false,Coercion),(dummy_loc,s),d,Class.add_coercion_hook)
      | IDENT "Identity"; IDENT "Coercion"; IDENT "Local"; f = identref;
         ":"; s = class_rawexpr; ">->"; t = class_rawexpr -> 
	   VernacIdentityCoercion (Local, f, s, t)
      | IDENT "Identity"; IDENT "Coercion"; f = identref; ":";
         s = class_rawexpr; ">->"; t = class_rawexpr -> 
	   VernacIdentityCoercion (Global, f, s, t)
      | IDENT "Coercion"; IDENT "Local"; qid = global; ":";
	 s = class_rawexpr; ">->"; t = class_rawexpr -> 
	  VernacCoercion (Local, qid, s, t)
      | IDENT "Coercion"; qid = global; ":"; s = class_rawexpr; ">->";
         t = class_rawexpr ->
	  VernacCoercion (Global, qid, s, t)

      (* Implicit *)
      | IDENT "Implicit"; IDENT "Arguments"; qid = global; 
         pos = OPT [ "["; l = LIST0 ident; "]" -> l ] ->
	   let pos = option_app (List.map (fun id -> ExplByName id)) pos in
	   VernacDeclareImplicits (qid,pos)

      | IDENT "Implicit"; ["Type" | IDENT "Types"];
	   idl = LIST1 identref; ":"; c = lconstr -> VernacReserve (idl,c) ] ]
  ;
END

GEXTEND Gram
  GLOBAL: command check_command class_rawexpr;

  command:
    [ [ IDENT "Comments"; l = LIST0 comment -> VernacComments l

      (* System directory *)
      | IDENT "Pwd" -> VernacChdir None
      | IDENT "Cd" -> VernacChdir None
      | IDENT "Cd"; dir = ne_string -> VernacChdir (Some dir)

      (* Toplevel control *)
      | IDENT "Drop" -> VernacToplevelControl Drop
      | IDENT "ProtectedLoop" -> VernacToplevelControl ProtectedLoop
      | IDENT "Quit" -> VernacToplevelControl Quit

      | IDENT "Load"; verbosely = [ IDENT "Verbose" -> true | -> false ];
	s = [ s = ne_string -> s | s = IDENT -> s ] ->
	  VernacLoad (verbosely, s)
      | IDENT "Declare"; IDENT "ML"; IDENT "Module"; l = LIST1 ne_string ->
	  VernacDeclareMLModule l

      (* Dump of the universe graph - to file or to stdout *) 
      | IDENT "Dump"; IDENT "Universes"; fopt = OPT ne_string ->
	  VernacPrint (PrintUniverses fopt)

      | IDENT "Locate"; l = locatable -> VernacLocate l

      (* Managing load paths *)
      | IDENT "Add"; IDENT "LoadPath"; dir = ne_string; alias = as_dirpath ->
	  VernacAddLoadPath (false, dir, alias)
      | IDENT "Add"; IDENT "Rec"; IDENT "LoadPath"; dir = ne_string; 
	  alias = as_dirpath -> VernacAddLoadPath (true, dir, alias)
      | IDENT "Remove"; IDENT "LoadPath"; dir = ne_string ->
	  VernacRemoveLoadPath dir

       (* For compatibility *)
      | IDENT "AddPath"; dir = ne_string; "as"; alias = as_dirpath ->
	  VernacAddLoadPath (false, dir, alias)
      | IDENT "AddRecPath"; dir = ne_string; "as"; alias = as_dirpath ->
	  VernacAddLoadPath (true, dir, alias)
      | IDENT "DelPath"; dir = ne_string ->
	  VernacRemoveLoadPath dir

      (* Type-Checking (pas dans le refman) *)
      | "Type"; c = lconstr -> VernacGlobalCheck c

      (* Printing (careful factorization of entries) *)
      | IDENT "Print"; p = printable -> VernacPrint p
      | IDENT "Print"; qid = global -> VernacPrint (PrintName qid)
      | IDENT "Print"; IDENT "Module"; "Type"; qid = global -> 
	  VernacPrint (PrintModuleType qid)
      | IDENT "Print"; IDENT "Module"; qid = global -> 
	  VernacPrint (PrintModule qid)
      | IDENT "Inspect"; n = natural -> VernacPrint (PrintInspect n)
      | IDENT "About"; qid = global -> VernacPrint (PrintAbout qid)

      (* Searching the environment *)
      | IDENT "Search"; qid = global; l = in_or_out_modules -> 
	  VernacSearch (SearchHead qid, l)
      | IDENT "SearchPattern"; c = constr_pattern; l = in_or_out_modules ->
	  VernacSearch (SearchPattern c, l)
      | IDENT "SearchRewrite"; c = constr_pattern; l = in_or_out_modules ->
	  VernacSearch (SearchRewrite c, l)
      | IDENT "SearchAbout"; 
	  sl = [ "["; l = LIST1 [ r = global -> SearchRef r
                                | s = ne_string -> SearchString s ]; "]" -> l 
   		 | qid = global -> [SearchRef qid] ];
	  l = in_or_out_modules -> 
	  VernacSearch (SearchAbout sl, l)

      | IDENT "Add"; IDENT "ML"; IDENT "Path"; dir = ne_string ->
	  VernacAddMLPath (false, dir)
      | IDENT "Add"; IDENT "Rec"; IDENT "ML"; IDENT "Path"; dir = ne_string ->
	  VernacAddMLPath (true, dir)

      (* Pour intervenir sur les tables de param�ètres *)
      | "Set"; table = IDENT; field = IDENT; v = option_value ->
  	  VernacSetOption (SecondaryTable (table,field),v)
      | "Set"; table = IDENT; field = IDENT; lv = LIST1 option_ref_value ->
  	  VernacAddOption (SecondaryTable (table,field),lv)
      | "Set"; table = IDENT; field = IDENT ->
  	  VernacSetOption (SecondaryTable (table,field),BoolValue true)
      | IDENT "Unset"; table = IDENT; field = IDENT ->
  	  VernacUnsetOption (SecondaryTable (table,field))
      | IDENT "Unset"; table = IDENT; field = IDENT; lv = LIST1 option_ref_value ->
  	  VernacRemoveOption (SecondaryTable (table,field),lv)
      | "Set"; table = IDENT; value = option_value ->
  	  VernacSetOption (PrimaryTable table, value)
      | "Set"; table = IDENT ->
  	  VernacSetOption (PrimaryTable table, BoolValue true)
      | IDENT "Unset"; table = IDENT ->
  	  VernacUnsetOption (PrimaryTable table)

      | IDENT "Print"; IDENT "Table"; table = IDENT; field = IDENT ->
	  VernacPrintOption (SecondaryTable (table,field))
      | IDENT "Print"; IDENT "Table"; table = IDENT ->
	  VernacPrintOption (PrimaryTable table)

      | IDENT "Add"; table = IDENT; field = IDENT; v = LIST1 option_ref_value
        -> VernacAddOption (SecondaryTable (table,field), v)

      (* Un value global ci-dessous va �être cach�é par un field au dessus! *)
      | IDENT "Add"; table = IDENT; v = LIST1 option_ref_value ->
          VernacAddOption (PrimaryTable table, v)

      | IDENT "Test"; table = IDENT; field = IDENT; v = LIST1 option_ref_value
        -> VernacMemOption (SecondaryTable (table,field), v)
      | IDENT "Test"; table = IDENT; field = IDENT ->
          VernacPrintOption (SecondaryTable (table,field))
      | IDENT "Test"; table = IDENT; v = LIST1 option_ref_value ->
          VernacMemOption (PrimaryTable table, v)
      | IDENT "Test"; table = IDENT ->
          VernacPrintOption (PrimaryTable table)

      | IDENT "Remove"; table = IDENT; field = IDENT; v= LIST1 option_ref_value
        -> VernacRemoveOption (SecondaryTable (table,field), v)
      | IDENT "Remove"; table = IDENT; v = LIST1 option_ref_value ->
	  VernacRemoveOption (PrimaryTable table, v) ] ]
  ;
  check_command: (* TODO: rapprocher Eval et Check *)
    [ [ IDENT "Eval"; r = Tactic.red_expr; "in"; c = lconstr ->
          fun g -> VernacCheckMayEval (Some r, g, c)
      | IDENT "Check"; c = lconstr ->
	  fun g -> VernacCheckMayEval (None, g, c) ] ]
  ;
  printable:
    [ [ IDENT "Term"; qid = global -> PrintName qid
      | IDENT "All" -> PrintFullContext
      | IDENT "Section"; s = global -> PrintSectionContext s
      | IDENT "Grammar"; ent = IDENT ->
          (* This should be in "syntax" section but is here for factorization*)
	  PrintGrammar ("", ent)
      | IDENT "LoadPath" -> PrintLoadPath
      | IDENT "Modules" -> PrintModules

      | IDENT "ML"; IDENT "Path" -> PrintMLLoadPath
      | IDENT "ML"; IDENT "Modules" -> PrintMLModules
      | IDENT "Graph" -> PrintGraph
      | IDENT "Classes" ->  PrintClasses
      | IDENT "Ltac"; qid = global -> PrintLtac qid
      | IDENT "Coercions" -> PrintCoercions
      | IDENT "Coercion"; IDENT "Paths"; s = class_rawexpr; t = class_rawexpr
         -> PrintCoercionPaths (s,t)
      | IDENT "Canonical"; IDENT "Projections" -> PrintCanonicalConversions
      | IDENT "Tables" -> PrintTables
(* Obsolete: was used for cooking V6.3 recipes ??
      | IDENT "Proof"; qid = global -> PrintOpaqueName qid
*)
      | IDENT "Hint" -> PrintHintGoal
      | IDENT "Hint"; qid = global -> PrintHint qid
      | IDENT "Hint"; "*" -> PrintHintDb
      | IDENT "HintDb"; s = IDENT -> PrintHintDbName s
      | "Rewrite"; IDENT "HintDb"; s = IDENT -> PrintRewriteHintDbName s
      | IDENT "Setoids" -> PrintSetoids
      | IDENT "Scopes" -> PrintScopes
      | IDENT "Scope"; s = IDENT -> PrintScope s
      | IDENT "Visibility"; s = OPT IDENT -> PrintVisibility s
      | IDENT "Implicit"; qid = global -> PrintImplicit qid ] ]
  ;
  class_rawexpr:
    [ [ IDENT "Funclass" -> FunClass
      | IDENT "Sortclass" -> SortClass
      | qid = global -> RefClass qid ] ]
  ;
  locatable:
    [ [ qid = global -> LocateTerm qid
      | IDENT "File"; f = ne_string -> LocateFile f
      | IDENT "Library"; qid = global -> LocateLibrary qid
      | IDENT "Module"; qid = global -> LocateModule qid
      | s = ne_string -> LocateNotation s ] ]
  ;
  option_value:
    [ [ n  = integer   -> IntValue n
      | s  = STRING    -> StringValue s ] ]
  ;
  option_ref_value:
    [ [ id = global   -> QualidRefValue id
      | s  = STRING   -> StringRefValue s ] ]
  ;
  as_dirpath:
    [ [ d = OPT [ "as"; d = dirpath -> d ] -> d ] ]
  ;
  in_or_out_modules:
    [ [ IDENT "inside"; l = LIST1 global -> SearchInside l
      | IDENT "outside"; l = LIST1 global -> SearchOutside l
      | -> SearchOutside [] ] ]
  ;
  comment:
    [ [ c = constr -> CommentConstr c
      | s = STRING -> CommentString s
      | n = natural -> CommentInt n ] ]
  ;
END;

GEXTEND Gram
  command:
    [ [ 
(* State management *)
        IDENT "Write"; IDENT "State"; s = IDENT -> VernacWriteState s
      | IDENT "Write"; IDENT "State"; s = ne_string -> VernacWriteState s
      | IDENT "Restore"; IDENT "State"; s = IDENT -> VernacRestoreState s
      | IDENT "Restore"; IDENT "State"; s = ne_string -> VernacRestoreState s

(* Resetting *)
      | IDENT "Reset"; id = identref -> VernacResetName id
      | IDENT "Reset"; IDENT "Initial" -> VernacResetInitial
      | IDENT "Back" -> VernacBack 1
      | IDENT "Back"; n = natural -> VernacBack n
      | IDENT "BackTo"; n = natural -> VernacBackTo n
      | IDENT "Backtrack"; n = natural ; m = natural ; p = natural -> 
	  VernacBacktrack (n,m,p)

(* Tactic Debugger *)
      |	IDENT "Debug"; IDENT "On" -> VernacDebug true
      |	IDENT "Debug"; IDENT "Off" -> VernacDebug false

 ] ];
    END
;;

(* Grammar extensions *)
	  
GEXTEND Gram
  GLOBAL: syntax;

  syntax:
   [ [ IDENT "Open"; local = locality; IDENT "Scope"; sc = IDENT -> 
         VernacOpenCloseScope (local,true,sc)

     | IDENT "Close"; local = locality; IDENT "Scope"; sc = IDENT -> 
         VernacOpenCloseScope (local,false,sc)

     | IDENT "Delimit"; IDENT "Scope"; sc = IDENT; "with"; key = IDENT ->
	 VernacDelimiters (sc,key)

     | IDENT "Bind"; IDENT "Scope"; sc = IDENT; "with"; 
       refl = LIST1 class_rawexpr -> VernacBindScope (sc,refl)

     | IDENT "Arguments"; IDENT "Scope"; qid = global;
         "["; scl = LIST0 opt_scope; "]" -> VernacArgumentsScope (qid,scl)

     | IDENT "Infix"; local = locality;
	 op = ne_string; ":="; p = global; 
         modl = [ "("; l = LIST1 syntax_modifier SEP ","; ")" -> l | -> [] ];
	 sc = OPT [ ":"; sc = IDENT -> sc ] ->
         VernacInfix (local,(op,modl),p,sc)
     | IDENT "Notation"; local = locality; id = ident; ":="; c = constr;
	 b = [ "("; IDENT "only"; IDENT "parsing"; ")" -> true | -> false ] ->
           VernacSyntacticDefinition (id,c,local,b)
     | IDENT "Notation"; local = locality; s = ne_string; ":="; c = constr;
         modl = [ "("; l = LIST1 syntax_modifier SEP ","; ")" -> l | -> [] ];
	 sc = OPT [ ":"; sc = IDENT -> sc ] ->
           VernacNotation (local,c,(s,modl),sc)

     | IDENT "Tactic"; IDENT "Notation"; n = tactic_level; 
	 pil = LIST1 production_item; ":="; t = Tactic.tactic
         -> VernacTacticNotation (n,pil,t)

     | IDENT "Reserved"; IDENT "Notation"; local = locality; s = ne_string; 
	 l = [ "("; l = LIST1 syntax_modifier SEP ","; ")" -> l | -> [] ]
	 -> VernacSyntaxExtension (local,(s,l))

     (* "Print" "Grammar" should be here but is in "command" entry in order 
        to factorize with other "Print"-based vernac entries *)
  ] ]
  ;
  tactic_level:
    [ [ "("; "at"; IDENT "level"; n = natural; ")" -> n | -> 0 ] ]
  ;
  locality:
    [ [ IDENT "Local" -> true | -> false ] ]
  ;
  level:
    [ [ IDENT "level"; n = natural -> NumLevel n
      | IDENT "next"; IDENT "level" -> NextLevel ] ]
  ;
  syntax_modifier:
    [ [ x = IDENT; "at"; lev = level -> SetItemLevel ([x],lev)
      | x = IDENT; ","; l = LIST1 IDENT SEP ","; "at"; 
        lev = level -> SetItemLevel (x::l,lev)
      | "at"; IDENT "level"; n = natural -> SetLevel n
      | IDENT "left"; IDENT "associativity" -> SetAssoc Gramext.LeftA
      | IDENT "right"; IDENT "associativity" -> SetAssoc Gramext.RightA
      | IDENT "no"; IDENT "associativity" -> SetAssoc Gramext.NonA
      | x = IDENT; typ = syntax_extension_type -> SetEntryType (x,typ)
      | IDENT "only"; IDENT "parsing" -> SetOnlyParsing
      | IDENT "format"; s = [s = STRING -> (loc,s)] -> SetFormat s ] ]
  ;
  syntax_extension_type:
    [ [ IDENT "ident" -> ETIdent | IDENT "global" -> ETReference
      | IDENT "bigint" -> ETBigint
    ] ]
  ;
  opt_scope:
    [ [ "_" -> None | sc = IDENT -> Some sc ] ]
  ;
  production_item:
    [ [ s = ne_string -> VTerm s
      | nt = IDENT; po = OPT [ "("; p = ident; ")" -> p ] -> 
	  VNonTerm (loc,nt,po) ] ]
  ;
END