path: root/vernac/g_vernac.mlg

(************************************************************************)
(*         *   The Coq Proof Assistant / The Coq Development Team       *)
(*  v      *   INRIA, CNRS and contributors - Copyright 1999-2018       *)
(* <O___,, *       (see CREDITS file for the list of authors)           *)
(*   \VV/  **************************************************************)
(*    //   *    This file is distributed under the terms of the         *)
(*         *     GNU Lesser General Public License Version 2.1          *)
(*         *     (see LICENSE file for the text of the license)         *)
(************************************************************************)

{

open Pp
open CErrors
open Util
open Names
open Glob_term
open Vernacexpr
open Constrexpr
open Constrexpr_ops
open Extend
open Decl_kinds
open Declaremods
open Declarations
open Namegen
open Tok (* necessary for camlp5 *)

open Pcoq
open Pcoq.Prim
open Pcoq.Constr
open Pcoq.Module
open Pvernac.Vernac_

let vernac_kw = [ ";"; ","; ">->"; ":<"; "<:"; "where"; "at" ]
let _ = List.iter CLexer.add_keyword vernac_kw

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

let query_command = Gram.entry_create "vernac:query_command"

let subprf = Gram.entry_create "vernac:subprf"

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 decl_notation = Gram.entry_create "vernac:decl_notation"
let record_field = Gram.entry_create "vernac:record_field"
let of_type_with_opt_coercion = Gram.entry_create "vernac:of_type_with_opt_coercion"
let instance_name = Gram.entry_create "vernac:instance_name"
let section_subset_expr = Gram.entry_create "vernac:section_subset_expr"

let make_bullet s =
  let open Proof_bullet in
  let n = String.length s in
  match s.[0] with
  | '-' -> Dash n
  | '+' -> Plus n
  | '*' -> Star n
  | _ -> assert false

let parse_compat_version ?(allow_old = true) = let open Flags in function
  | "8.8" -> Current
  | "8.7" -> V8_7
  | "8.6" -> V8_6
  | ("8.5" | "8.4" | "8.3" | "8.2" | "8.1" | "8.0") as s ->
    CErrors.user_err ~hdr:"get_compat_version"
      Pp.(str "Compatibility with version " ++ str s ++ str " not supported.")
  | s ->
    CErrors.user_err ~hdr:"get_compat_version"
      Pp.(str "Unknown compatibility version \"" ++ str s ++ str "\".")

}

GRAMMAR EXTEND Gram
  GLOBAL: vernac_control gallina_ext noedit_mode subprf;
  vernac_control: FIRST
    [ [ IDENT "Time"; c = located_vernac -> { VernacTime (false,c) }
      | IDENT "Redirect"; s = ne_string; c = located_vernac -> { VernacRedirect (s, c) }
      | IDENT "Timeout"; n = natural; v = vernac_control -> { VernacTimeout(n,v) }
      | IDENT "Fail"; v = vernac_control -> { VernacFail v }
      | v = vernac -> { let (f, v) = v in VernacExpr(f, v) } ]
    ]
  ;
  vernac:
    [ [ IDENT "Local"; v = vernac_poly -> { let (f, v) = v in (VernacLocal true :: f, v) }
      | IDENT "Global"; v = vernac_poly -> { let (f, v) = v in (VernacLocal false :: f, v) }

      | v = vernac_poly -> { v } ]
    ]
  ;
  vernac_poly:
    [ [ IDENT "Polymorphic"; v = vernac_aux -> { let (f, v) = v in (VernacPolymorphic true :: f, v) }
      | IDENT "Monomorphic"; v = vernac_aux -> { let (f, v) = v in (VernacPolymorphic false :: f, v) }
      | v = vernac_aux -> { v } ]
    ]
  ;
  vernac_aux:
    (* 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         *)
    [ [ IDENT "Program"; g = gallina; "." -> { ([VernacProgram], g) }
      | IDENT "Program"; g = gallina_ext; "." -> { ([VernacProgram], g) }
      | g = gallina; "." -> { ([], g) }
      | g = gallina_ext; "." -> { ([], g) }
      | c = command; "." -> { ([], c) }
      | c = syntax; "." -> { ([], c) }
      | c = subprf -> { ([], c) }
    ] ]
  ;
  vernac_aux: LAST
    [ [ prfcom = command_entry -> { ([], prfcom) } ] ]
  ;
  noedit_mode:
    [ [ c = query_command -> { c None } ] ]
  ;

  subprf:
  [ [ s = BULLET -> { VernacBullet (make_bullet s) }
    | "{" -> { VernacSubproof None }
    | "}" -> { VernacEndSubproof }
    ] ]
  ;

  located_vernac:
    [ [ v = vernac_control -> { CAst.make ~loc v } ] ]
  ;
END

{

let warn_plural_command =
  CWarnings.create ~name:"plural-command" ~category:"pedantic" ~default:CWarnings.Disabled
         (fun kwd -> strbrk (Printf.sprintf "Command \"%s\" expects more than one assumption." kwd))

let test_plural_form loc kwd = function
  | [(_,([_],_))] ->
     warn_plural_command ~loc kwd
  | _ -> ()

let test_plural_form_types loc kwd = function
  | [([_],_)] ->
     warn_plural_command ~loc kwd
  | _ -> ()

let lname_of_lident : lident -> lname =
  CAst.map (fun s -> Name s)

let name_of_ident_decl : ident_decl -> name_decl =
  on_fst lname_of_lident

}

(* Gallina declarations *)
GRAMMAR EXTEND Gram
  GLOBAL: gallina gallina_ext thm_token def_body of_type_with_opt_coercion
    record_field decl_notation rec_definition ident_decl univ_decl;

  gallina:
      (* Definition, Theorem, Variable, Axiom, ... *)
    [ [ thm = thm_token; id = ident_decl; bl = binders; ":"; c = lconstr;
        l = LIST0
          [ "with"; id = ident_decl; bl = binders; ":"; c = lconstr ->
          { (id,(bl,c)) } ] ->
          { VernacStartTheoremProof (thm, (id,(bl,c))::l) }
      | stre = assumption_token; nl = inline; bl = assum_list ->
	  { VernacAssumption (stre, nl, bl) }
      | tk = assumptions_token; nl = inline; bl = assum_list ->
          { let (kwd,stre) = tk in 
            test_plural_form loc kwd bl;
            VernacAssumption (stre, nl, bl) }
      | d = def_token; id = ident_decl; b = def_body ->
          { VernacDefinition (d, name_of_ident_decl id, b) }
      | IDENT "Let"; id = identref; b = def_body ->
          { VernacDefinition ((DoDischarge, Let), (lname_of_lident id, None), b) }
      (* Gallina inductive declarations *)
      | cum = OPT cumulativity_token; priv = private_token; f = finite_token;
        indl = LIST1 inductive_definition SEP "with" ->
	  { let (k,f) = f in
          let indl=List.map (fun ((a,b,c,d),e) -> ((a,b,c,k,d),e)) indl in
          VernacInductive (cum, priv,f,indl) }
      | "Fixpoint"; recs = LIST1 rec_definition SEP "with" ->
          { VernacFixpoint (NoDischarge, recs) }
      | IDENT "Let"; "Fixpoint"; recs = LIST1 rec_definition SEP "with" ->
          { VernacFixpoint (DoDischarge, recs) }
      | "CoFixpoint"; corecs = LIST1 corec_definition SEP "with" ->
          { VernacCoFixpoint (NoDischarge, corecs) }
      | IDENT "Let"; "CoFixpoint"; corecs = LIST1 corec_definition SEP "with" ->
          { VernacCoFixpoint (DoDischarge, corecs) }
      | IDENT "Scheme"; l = LIST1 scheme SEP "with" -> { VernacScheme l }
      | IDENT "Combined"; IDENT "Scheme"; id = identref; IDENT "from";
	      l = LIST1 identref SEP "," -> { VernacCombinedScheme (id, l) }
      | IDENT "Register"; IDENT "Inline"; id = identref ->
          { VernacRegister(id, RegisterInline) }
      | IDENT "Universe"; l = LIST1 identref -> { VernacUniverse l }
      | IDENT "Universes"; l = LIST1 identref -> { VernacUniverse l }
      | IDENT "Constraint"; l = LIST1 univ_constraint SEP "," -> { VernacConstraint l }
  ] ]
  ;

  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" -> { (NoDischarge,Definition) }
      | IDENT "Example" -> { (NoDischarge,Example) }
      | IDENT "SubClass" -> { (NoDischarge,SubClass) } ] ]
  ;
  assumption_token:
    [ [ "Hypothesis" -> { (DoDischarge, Logical) }
      | "Variable" -> { (DoDischarge, Definitional) }
      | "Axiom" -> { (NoDischarge, Logical) }
      | "Parameter" -> { (NoDischarge, Definitional) }
      | IDENT "Conjecture" -> { (NoDischarge, Conjectural) } ] ]
  ;
  assumptions_token:
    [ [ IDENT "Hypotheses" -> { ("Hypotheses", (DoDischarge, Logical)) }
      | IDENT "Variables" -> { ("Variables", (DoDischarge, Definitional)) }
      | IDENT "Axioms" -> { ("Axioms", (NoDischarge, Logical)) }
      | IDENT "Parameters" -> { ("Parameters", (NoDischarge, Definitional)) }
      | IDENT "Conjectures" -> { ("Conjectures", (NoDischarge, Conjectural)) } ] ]
  ;
  inline:
    [ [ IDENT "Inline"; "("; i = INT; ")" -> { InlineAt (int_of_string i) }
      | IDENT "Inline" -> { DefaultInline }
      | -> { NoInline } ] ]
  ;
  univ_constraint:
    [ [ l = universe_level; ord = [ "<" -> { Univ.Lt } | "=" -> { Univ.Eq } | "<=" -> { Univ.Le } ];
	r = universe_level -> { (l, ord, r) } ] ]
  ;
  univ_decl :
    [ [  "@{" ; l = LIST0 identref; ext = [ "+" -> { true } | -> { false } ];
         cs = [ "|"; l' = LIST0 univ_constraint SEP ",";
                ext = [ "+" -> { true } | -> { false } ]; "}" -> { (l',ext) }
              | ext = [ "}" -> { true } | "|}" -> { false } ] -> { ([], ext) } ]
         ->
         { let open UState in
         { univdecl_instance = l;
           univdecl_extensible_instance = ext;
           univdecl_constraints = fst cs;
           univdecl_extensible_constraints = snd cs } }
    ] ]
  ;
  ident_decl:
    [ [ i = identref; l = OPT univ_decl -> { (i, l) }
  ] ]
  ;
  finite_token:
    [ [ IDENT "Inductive" -> { (Inductive_kw,Finite) }
      | IDENT "CoInductive" -> { (CoInductive,CoFinite) }
      | IDENT "Variant" -> { (Variant,BiFinite) }
      | IDENT "Record" -> { (Record,BiFinite) }
      | IDENT "Structure" -> { (Structure,BiFinite) }
      | IDENT "Class" -> { (Class true,BiFinite) } ] ]
  ;
  cumulativity_token:
    [ [ IDENT "Cumulative" -> { VernacCumulative }
      | IDENT "NonCumulative" -> { VernacNonCumulative } ] ]
  ;
  private_token:
    [ [ IDENT "Private" -> { true } | -> { false } ] ]
  ;
  (* Simple definitions *)
  def_body:
    [ [ bl = binders; ":="; red = reduce; c = lconstr ->
      { if List.exists (function CLocalPattern _ -> true | _ -> false) bl
      then
        (* FIXME: "red" will be applied to types in bl and Cast with remain *)
        let c = mkCLambdaN ~loc bl c in
	DefineBody ([], red, c, None)
      else
        (match c with
        | { CAst.v = CCast(c, CastConv t) } -> DefineBody (bl, red, c, Some t)
        | _ -> DefineBody (bl, red, c, None)) }
    | bl = binders; ":"; t = lconstr; ":="; red = reduce; c = lconstr ->
        { let ((bl, c), tyo) =
          if List.exists (function CLocalPattern _ -> true | _ -> false) bl
          then
            (* FIXME: "red" will be applied to types in bl and Cast with remain *)
            let c = CAst.make ~loc @@ CCast (c, CastConv t) in
            (([],mkCLambdaN ~loc bl c), None)
          else ((bl, c), Some t)
        in
	DefineBody (bl, red, c, tyo) }
    | bl = binders; ":"; t = lconstr ->
        { ProveBody (bl, t) } ] ]
  ;
  reduce:
    [ [ IDENT "Eval"; r = red_expr; "in" -> { Some r }
      | -> { None } ] ]
  ;
  one_decl_notation:
    [ [ ntn = ne_lstring; ":="; c = constr;
        scopt = OPT [ ":"; sc = IDENT -> { sc } ] -> { (ntn,c,scopt) } ] ]
  ;
  decl_sep:
    [ [ IDENT "and" -> { () } ] ]
  ;
  decl_notation:
    [ [ "where"; l = LIST1 one_decl_notation SEP decl_sep -> { l }
    | -> { [] } ] ]
  ;
  (* Inductives and records *)
  opt_constructors_or_fields:
    [ [ ":="; lc = constructor_list_or_record_decl -> { lc }
      | -> { RecordDecl (None, []) } ] ]
  ;
  inductive_definition:
    [ [ oc = opt_coercion; id = ident_decl; indpar = binders;
        c = OPT [ ":"; c = lconstr -> { c } ];
        lc=opt_constructors_or_fields; ntn = decl_notation ->
	   { (((oc,id),indpar,c,lc),ntn) } ] ]
  ;
  constructor_list_or_record_decl:
    [ [ "|"; l = LIST1 constructor SEP "|" -> { Constructors l }
      | id = identref ; c = constructor_type; "|"; l = LIST0 constructor SEP "|" ->
	  { Constructors ((c id)::l) }
      | id = identref ; c = constructor_type -> { Constructors [ c id ] }
      | cstr = identref; "{"; fs = record_fields; "}" ->
	  { RecordDecl (Some cstr,fs) }
      | "{";fs = record_fields; "}" -> { RecordDecl (None,fs) }
      |  -> { Constructors [] } ] ]
  ;
(*
  csort:
    [ [ s = sort -> CSort (loc,s) ] ]
  ;
*)
  opt_coercion:
    [ [ ">" -> { true }
      |  -> { false } ] ]
  ;
  (* (co)-fixpoints *)
  rec_definition:
    [ [ id = ident_decl;
	bl = binders_fixannot;
        ty = type_cstr;
	def = OPT [":="; def = lconstr -> { def } ]; ntn = decl_notation ->
	  { let bl, annot = bl in ((id,annot,bl,ty,def),ntn) } ] ]
  ;
  corec_definition:
    [ [ id = ident_decl; bl = binders; ty = type_cstr;
        def = OPT [":="; def = lconstr -> { def }]; ntn = decl_notation ->
          { ((id,bl,ty,def),ntn) } ] ]
  ;
  type_cstr:
    [ [ ":"; c=lconstr -> { c }
      | -> { CAst.make ~loc @@ CHole (None, IntroAnonymous, None) } ] ]
  ;
  (* Inductive schemes *)
  scheme:
    [ [ kind = scheme_kind -> { (None,kind) }
      | id = identref; ":="; kind = scheme_kind -> { (Some id,kind) } ] ]
  ;
  scheme_kind:
    [ [ IDENT "Induction"; "for"; ind = smart_global;
          IDENT "Sort"; s = sort_family-> { InductionScheme(true,ind,s) }
      | IDENT "Minimality"; "for"; ind = smart_global;
          IDENT "Sort"; s = sort_family-> { InductionScheme(false,ind,s) }
      | IDENT "Elimination"; "for"; ind = smart_global;
          IDENT "Sort"; s = sort_family-> { CaseScheme(true,ind,s) }
      | IDENT "Case"; "for"; ind = smart_global;
          IDENT "Sort"; s = sort_family-> { CaseScheme(false,ind,s) }
      | IDENT "Equality"; "for" ; ind = smart_global -> { EqualityScheme(ind) } ] ]
  ;
  (* Various Binders *)
(*
  (* ... without coercions *)
  binder_nodef:
    [ [ b = binder_let ->
      (match b with
          CLocalAssum(l,ty) -> (l,ty)
        | CLocalDef _ ->
            Util.user_err_loc
              (loc,"fix_param",Pp.str"defined binder not allowed here.")) ] ]
  ;
*)
  (* ... with coercions *)
  record_field:
  [ [ bd = record_binder; pri = OPT [ "|"; n = natural -> { n } ];
      ntn = decl_notation -> { (bd,pri),ntn } ] ]
  ;
  record_fields:
    [ [ f = record_field; ";"; fs = record_fields -> { f :: fs }
      | f = record_field; ";" -> { [f] }
      | f = record_field -> { [f] }
      | -> { [] }
    ] ]
  ;
  record_binder_body:
    [ [ l = binders; oc = of_type_with_opt_coercion;
         t = lconstr -> { fun id -> (oc,AssumExpr (id,mkCProdN ~loc l t)) }
      | l = binders; oc = of_type_with_opt_coercion;
         t = lconstr; ":="; b = lconstr -> { fun id ->
	   (oc,DefExpr (id,mkCLambdaN ~loc l b,Some (mkCProdN ~loc l t))) }
      | l = binders; ":="; b = lconstr -> { fun id ->
         match b.CAst.v with
	 | CCast(b', (CastConv t|CastVM t|CastNative t)) ->
	     (None,DefExpr(id,mkCLambdaN ~loc l b',Some (mkCProdN ~loc l t)))
         | _ ->
	     (None,DefExpr(id,mkCLambdaN ~loc l b,None)) } ] ]
  ;
  record_binder:
    [ [ id = name -> { (None,AssumExpr(id, CAst.make ~loc @@ CHole (None, IntroAnonymous, None))) }
      | id = name; f = record_binder_body -> { f id } ] ]
  ;
  assum_list:
    [ [ bl = LIST1 assum_coe -> { bl } | b = simple_assum_coe -> { [b] } ] ]
  ;
  assum_coe:
    [ [ "("; a = simple_assum_coe; ")" -> { a } ] ]
  ;
  simple_assum_coe:
    [ [ idl = LIST1 ident_decl; oc = of_type_with_opt_coercion; c = lconstr ->
        { (not (Option.is_empty oc),(idl,c)) } ] ]
  ;

  constructor_type:
    [[ l = binders;
      t= [ coe = of_type_with_opt_coercion; c = lconstr ->
	            { fun l id -> (not (Option.is_empty coe),(id,mkCProdN ~loc l c)) }
            |  ->
                 { fun l id -> (false,(id,mkCProdN ~loc l (CAst.make ~loc @@ CHole (None, IntroAnonymous, None)))) } ]
	 -> { t l }
     ]]
;

  constructor:
    [ [ id = identref; c=constructor_type -> { c id } ] ]
  ;
  of_type_with_opt_coercion:
    [ [ ":>>" -> { Some false }
	| ":>"; ">" -> { Some false }
	| ":>" -> { Some true }
	| ":"; ">"; ">" -> { Some false }
	| ":"; ">" -> { Some true }
	| ":" -> { None } ] ]
  ;
END

{

let only_starredidentrefs =
  Gram.Entry.of_parser "test_only_starredidentrefs"
    (fun strm ->
      let rec aux n =
      match Util.stream_nth n strm with
        | KEYWORD "." -> ()
        | KEYWORD ")" -> ()
        | (IDENT _ | KEYWORD "Type" | KEYWORD "*") -> aux (n+1)
        | _ -> raise Stream.Failure in
      aux 0)
let starredidentreflist_to_expr l =
  match l with
  | [] -> SsEmpty
  | x :: xs -> List.fold_right (fun i acc -> SsUnion(i,acc)) xs x

let warn_deprecated_include_type =
  CWarnings.create ~name:"deprecated-include-type" ~category:"deprecated"
         (fun () -> strbrk "Include Type is deprecated; use Include instead")

}

(* Modules and Sections *)
GRAMMAR EXTEND Gram
  GLOBAL: gallina_ext module_expr module_type section_subset_expr;

  gallina_ext:
    [ [ (* Interactive module declaration *)
        IDENT "Module"; export = export_token; id = identref;
	bl = LIST0 module_binder; sign = of_module_type;
	body = is_module_expr ->
	  { VernacDefineModule (export, id, bl, sign, body) }
      | IDENT "Module"; "Type"; id = identref;
	bl = LIST0 module_binder; sign = check_module_types;
	body = is_module_type ->
	  { VernacDeclareModuleType (id, bl, sign, body) }
      | IDENT "Declare"; IDENT "Module"; export = export_token; id = identref;
	bl = LIST0 module_binder; ":"; mty = module_type_inl ->
	  { VernacDeclareModule (export, id, bl, mty) }
      (* 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 }

      (* Naming a set of section hyps *)
      | IDENT "Collection"; id = identref; ":="; expr = section_subset_expr ->
          { VernacNameSectionHypSet (id, expr) }

      (* Requiring an already compiled module *)
      | IDENT "Require"; export = export_token; qidl = LIST1 global ->
          { VernacRequire (None, export, qidl) }
      | IDENT "From" ; ns = global ; IDENT "Require"; export = export_token
	; qidl = LIST1 global ->
	{ VernacRequire (Some ns, export, qidl) }
      | IDENT "Import"; qidl = LIST1 global -> { VernacImport (false,qidl) }
      | IDENT "Export"; qidl = LIST1 global -> { VernacImport (true,qidl) }
      | IDENT "Include"; e = module_type_inl; l = LIST0 ext_module_expr ->
	  { VernacInclude(e::l) }
      | IDENT "Include"; "Type"; e = module_type_inl; l = LIST0 ext_module_type ->
	 { warn_deprecated_include_type ~loc ();
        VernacInclude(e::l) } ] ]
  ;
  export_token:
    [ [ IDENT "Import" -> { Some false }
      | IDENT "Export" -> { Some true }
      |  -> { None } ] ]
  ;
  ext_module_type:
    [ [ "<+"; mty = module_type_inl -> { mty } ] ]
  ;
  ext_module_expr:
    [ [ "<+"; mexpr = module_expr_inl -> { mexpr } ] ]
  ;
  check_module_type:
    [ [ "<:"; mty = module_type_inl -> { mty } ] ]
  ;
  check_module_types:
    [ [ mtys = LIST0 check_module_type -> { mtys } ] ]
  ;
  of_module_type:
    [ [ ":"; mty = module_type_inl -> { Enforce mty }
      | mtys = check_module_types -> { Check mtys } ] ]
  ;
  is_module_type:
    [ [ ":="; mty = module_type_inl ; l = LIST0 ext_module_type -> { (mty::l) }
      | -> { [] } ] ]
  ;
  is_module_expr:
    [ [ ":="; mexpr = module_expr_inl; l = LIST0 ext_module_expr -> { (mexpr::l) }
      | -> { [] } ] ]
  ;
  functor_app_annot:
    [ [ "["; IDENT "inline"; "at"; IDENT "level"; i = INT; "]" ->
        { InlineAt (int_of_string i) }
      | "["; IDENT "no"; IDENT "inline"; "]" -> { NoInline }
      | -> { DefaultInline }
      ] ]
  ;
  module_expr_inl:
    [ [ "!"; me = module_expr -> { (me,NoInline) }
      | me = module_expr; a = functor_app_annot -> { (me,a) } ] ]
  ;
  module_type_inl:
    [ [ "!"; me = module_type -> { (me,NoInline) }
      | me = module_type; a = functor_app_annot -> { (me,a) } ] ]
  ;
  (* Module binder  *)
  module_binder:
    [ [ "("; export = export_token; idl = LIST1 identref; ":";
         mty = module_type_inl; ")" -> { (export,idl,mty) } ] ]
  ;
  (* Module expressions *)
  module_expr:
    [ [ me = module_expr_atom -> { me }
      | me1 = module_expr; me2 = module_expr_atom -> { CAst.make ~loc @@ CMapply (me1,me2) }
      ] ]
  ;
  module_expr_atom:
    [ [ qid = qualid -> { CAst.make ~loc @@ CMident qid } | "("; me = module_expr; ")" -> { me } ] ]
  ;
  with_declaration:
    [ [ "Definition"; fqid = fullyqualid; udecl = OPT univ_decl; ":="; c = Constr.lconstr ->
          { CWith_Definition (fqid,udecl,c) }
      | IDENT "Module"; fqid = fullyqualid; ":="; qid = qualid ->
	  { CWith_Module (fqid,qid) }
      ] ]
  ;
  module_type:
    [ [ qid = qualid -> { CAst.make ~loc @@ CMident qid }
      | "("; mt = module_type; ")" -> { mt }
      | mty = module_type; me = module_expr_atom ->
          { CAst.make ~loc @@ CMapply (mty,me) }
      | mty = module_type; "with"; decl = with_declaration ->
          { CAst.make ~loc @@ CMwith (mty,decl) }
      ] ]
  ;
  (* Proof using *)
  section_subset_expr:
    [ [ only_starredidentrefs; l = LIST0 starredidentref ->
          { starredidentreflist_to_expr l }
      | e = ssexpr -> { e } ]]
  ;
  starredidentref:
    [ [ i = identref -> { SsSingl i }
      | i = identref; "*" -> { SsFwdClose(SsSingl i) }
      | "Type" -> { SsType }
      | "Type"; "*" -> { SsFwdClose SsType } ]]
  ;
  ssexpr:
    [ "35" 
      [ "-"; e = ssexpr -> { SsCompl e } ]
    | "50"
      [ e1 = ssexpr; "-"; e2 = ssexpr-> { SsSubstr(e1,e2) }
      | e1 = ssexpr; "+"; e2 = ssexpr-> { SsUnion(e1,e2) } ]
    | "0"
      [ i = starredidentref -> { i }
      | "("; only_starredidentrefs; l = LIST0 starredidentref; ")"->
          { starredidentreflist_to_expr l }
      | "("; only_starredidentrefs; l = LIST0 starredidentref; ")"; "*" ->
          { SsFwdClose(starredidentreflist_to_expr l) }
      | "("; e = ssexpr; ")"-> { e }
      | "("; e = ssexpr; ")"; "*" -> { SsFwdClose e } ] ]
  ;
END

(* Extensions: implicits, coercions, etc. *)
GRAMMAR EXTEND Gram
  GLOBAL: gallina_ext instance_name hint_info;

  gallina_ext:
    [ [ (* Transparent and Opaque *)
        IDENT "Transparent"; l = LIST1 smart_global ->
          { VernacSetOpacity (Conv_oracle.transparent, l) }
      | IDENT "Opaque"; l = LIST1 smart_global ->
          { VernacSetOpacity (Conv_oracle.Opaque, l) }
      | IDENT "Strategy"; l =
          LIST1 [ v=strategy_level; "["; q=LIST1 smart_global; "]" -> { (v,q) } ] ->
            { VernacSetStrategy l }
      (* Canonical structure *)
      | IDENT "Canonical"; IDENT "Structure"; qid = global ->
          { VernacCanonical CAst.(make ~loc @@ AN qid) }
      | IDENT "Canonical"; IDENT "Structure"; ntn = by_notation ->
          { VernacCanonical CAst.(make ~loc @@ ByNotation ntn) }
      | IDENT "Canonical"; IDENT "Structure"; qid = global; d = def_body ->
          { let s = coerce_reference_to_id qid in
          VernacDefinition ((NoDischarge,CanonicalStructure),((CAst.make (Name s)),None),d) }

      (* Coercions *)
      | IDENT "Coercion"; qid = global; d = def_body ->
          { let s = coerce_reference_to_id qid in
          VernacDefinition ((NoDischarge,Coercion),((CAst.make (Name s)),None),d) }
      | IDENT "Identity"; IDENT "Coercion"; f = identref; ":";
         s = class_rawexpr; ">->"; t = class_rawexpr ->
           { VernacIdentityCoercion (f, s, t) }
      | IDENT "Coercion"; qid = global; ":"; s = class_rawexpr; ">->";
         t = class_rawexpr ->
          { VernacCoercion (CAst.make ~loc @@ AN qid, s, t) }
      | IDENT "Coercion"; ntn = by_notation; ":"; s = class_rawexpr; ">->";
         t = class_rawexpr ->
          { VernacCoercion (CAst.make ~loc @@ ByNotation ntn, s, t) }

      | IDENT "Context"; c = LIST1 binder ->
          { VernacContext (List.flatten c) }

      | IDENT "Instance"; namesup = instance_name; ":";
	 expl = [ "!" -> { Decl_kinds.Implicit } | -> { Decl_kinds.Explicit } ] ; t = operconstr LEVEL "200";
	 info = hint_info ;
	 props = [ ":="; "{"; r = record_declaration; "}" -> { Some (true,r) } |
	     ":="; c = lconstr -> { Some (false,c) } | -> { None } ] ->
	   { VernacInstance (false,snd namesup,(fst namesup,expl,t),props,info) }

      | IDENT "Existing"; IDENT "Instance"; id = global;
          info = hint_info ->
	  { VernacDeclareInstances [id, info] }

      | IDENT "Existing"; IDENT "Instances"; ids = LIST1 global;
        pri = OPT [ "|"; i = natural -> { i } ] ->
         { let info = { Typeclasses.hint_priority = pri; hint_pattern = None } in
         let insts = List.map (fun i -> (i, info)) ids in
	  VernacDeclareInstances insts }

      | IDENT "Existing"; IDENT "Class"; is = global -> { VernacDeclareClass is }

      (* Arguments *)
      | IDENT "Arguments"; qid = smart_global; 
        args = LIST0 argument_spec_block;
        more_implicits = OPT
          [ ","; impl = LIST1
            [ impl = LIST0 more_implicits_block -> { List.flatten impl } ]
            SEP "," -> { impl }
          ];
        mods = OPT [ ":"; l = LIST1 arguments_modifier SEP "," -> { l } ] ->
         { let mods = match mods with None -> [] | Some l -> List.flatten l in
         let slash_position = ref None in
         let rec parse_args i = function
           | [] -> []
           | `Id x :: args -> x :: parse_args (i+1) args
           | `Slash :: args ->
              if Option.is_empty !slash_position then
                (slash_position := Some i; parse_args i args)
              else
                user_err Pp.(str "The \"/\" modifier can occur only once")
         in
         let args = parse_args 0 (List.flatten args) in
         let more_implicits = Option.default [] more_implicits in
         VernacArguments (qid, args, more_implicits, !slash_position, mods) }

      | IDENT "Implicit"; "Type"; bl = reserv_list ->
	   { VernacReserve bl }

      | IDENT "Implicit"; IDENT "Types"; bl = reserv_list ->
          { test_plural_form_types loc "Implicit Types" bl;
           VernacReserve bl }

      | IDENT "Generalizable"; 
	   gen = [IDENT "All"; IDENT "Variables" -> { Some [] }
	     | IDENT "No"; IDENT "Variables" -> { None }
	     | ["Variable" -> { () } | IDENT "Variables" -> { () } ];
		  idl = LIST1 identref -> { Some idl } ] ->
	     { VernacGeneralizable gen } ] ]
  ;
  arguments_modifier:
    [ [ IDENT "simpl"; IDENT "nomatch" -> { [`ReductionDontExposeCase] }
      | IDENT "simpl"; IDENT "never" -> { [`ReductionNeverUnfold] }
      | IDENT "default"; IDENT "implicits" -> { [`DefaultImplicits] }
      | IDENT "clear"; IDENT "implicits" -> { [`ClearImplicits] }
      | IDENT "clear"; IDENT "scopes" -> { [`ClearScopes] }
      | IDENT "rename" -> { [`Rename] }
      | IDENT "assert" -> { [`Assert] }
      | IDENT "extra"; IDENT "scopes" -> { [`ExtraScopes] }
      | IDENT "clear"; IDENT "scopes"; IDENT "and"; IDENT "implicits" ->
          { [`ClearImplicits; `ClearScopes] }
      | IDENT "clear"; IDENT "implicits"; IDENT "and"; IDENT "scopes" ->
          { [`ClearImplicits; `ClearScopes] }
      ] ]
  ;
  scope:
    [ [ "%"; key = IDENT -> { key } ] ]
  ;
  argument_spec: [
       [ b = OPT "!"; id = name ; s = OPT scope ->
       { id.CAst.v, not (Option.is_empty b), Option.map (fun x -> CAst.make ~loc x) s }
    ]
  ];
  (* List of arguments implicit status, scope, modifiers *)
  argument_spec_block: [
    [ item = argument_spec ->
      { let name, recarg_like, notation_scope = item in
      [`Id { name=name; recarg_like=recarg_like;
             notation_scope=notation_scope;
             implicit_status = NotImplicit}] }
    | "/" -> { [`Slash] }
    | "("; items = LIST1 argument_spec; ")"; sc = OPT scope ->
       { let f x = match sc, x with
         | None, x -> x | x, None -> Option.map (fun y -> CAst.make ~loc y) x
         | Some _, Some _ -> user_err Pp.(str "scope declared twice") in
       List.map (fun (name,recarg_like,notation_scope) ->
           `Id { name=name; recarg_like=recarg_like;
                 notation_scope=f notation_scope;
                 implicit_status = NotImplicit}) items }
    | "["; items = LIST1 argument_spec; "]"; sc = OPT scope ->
       { let f x = match sc, x with
         | None, x -> x | x, None -> Option.map (fun y -> CAst.make ~loc y) x
         | Some _, Some _ -> user_err Pp.(str "scope declared twice") in
       List.map (fun (name,recarg_like,notation_scope) ->
           `Id { name=name; recarg_like=recarg_like;
                 notation_scope=f notation_scope;
                 implicit_status = Implicit}) items }
    | "{"; items = LIST1 argument_spec; "}"; sc = OPT scope ->
       { let f x = match sc, x with
         | None, x -> x | x, None -> Option.map (fun y -> CAst.make ~loc y) x
         | Some _, Some _ -> user_err Pp.(str "scope declared twice") in
       List.map (fun (name,recarg_like,notation_scope) ->
           `Id { name=name; recarg_like=recarg_like;
                 notation_scope=f notation_scope;
                 implicit_status = MaximallyImplicit}) items }
    ]
  ];
  (* Same as [argument_spec_block], but with only implicit status and names *)
  more_implicits_block: [
    [ name = name -> { [(name.CAst.v, Vernacexpr.NotImplicit)] }
    | "["; items = LIST1 name; "]" ->
       { List.map (fun name -> (name.CAst.v, Vernacexpr.Implicit)) items }
    | "{"; items = LIST1 name; "}" ->
       { List.map (fun name -> (name.CAst.v, Vernacexpr.MaximallyImplicit)) items }
    ]
  ];
  strategy_level:
    [ [ IDENT "expand" -> { Conv_oracle.Expand }
      | IDENT "opaque" -> { Conv_oracle.Opaque }
      | n=INT -> { Conv_oracle.Level (int_of_string n) }
      | "-"; n=INT -> { Conv_oracle.Level (- int_of_string n) }
      | IDENT "transparent" -> { Conv_oracle.transparent } ] ]
  ;
  instance_name:
    [ [ name = ident_decl; sup = OPT binders ->
          { (CAst.map (fun id -> Name id) (fst name), snd name),
          (Option.default [] sup) }
      | -> { ((CAst.make ~loc Anonymous), None), []  } ] ]
  ;
  hint_info:
    [ [ "|"; i = OPT natural; pat = OPT constr_pattern ->
         { { Typeclasses.hint_priority = i; hint_pattern = pat } }
      | -> { { Typeclasses.hint_priority = None; hint_pattern = None } } ] ]
  ;
  reserv_list:
    [ [ bl = LIST1 reserv_tuple -> { bl } | b = simple_reserv -> { [b] } ] ]
  ;
  reserv_tuple:
    [ [ "("; a = simple_reserv; ")" -> { a } ] ]
  ;
  simple_reserv:
    [ [ idl = LIST1 identref; ":"; c = lconstr -> { (idl,c) } ] ]
  ;

END

GRAMMAR EXTEND Gram
  GLOBAL: command query_command class_rawexpr gallina_ext;

  gallina_ext:
    [ [ IDENT "Export"; "Set"; table = option_table; v = option_value ->
        { VernacSetOption (true, table, v) }
      | IDENT "Export"; IDENT "Unset"; table = option_table ->
          { VernacUnsetOption (true, table) }
    ] ];

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

      (* Hack! Should be in grammar_ext, but camlp5 factorizes badly *)
      | IDENT "Declare"; IDENT "Instance"; namesup = instance_name; ":";
	 expl = [ "!" -> { Decl_kinds.Implicit } | -> { Decl_kinds.Explicit } ] ; t = operconstr LEVEL "200";
	 info = hint_info ->
	   { VernacInstance (true, snd namesup, (fst namesup, expl, t), None, info) }

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

      | 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 }

      | 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 = smart_global; l = OPT univ_name_list -> { VernacPrint (PrintName (qid,l)) }
      | IDENT "Print"; IDENT "Module"; "Type"; qid = global ->
	  { VernacPrint (PrintModuleType qid) }
      | IDENT "Print"; IDENT "Module"; qid = global ->
	  { VernacPrint (PrintModule qid) }
      | IDENT "Print"; IDENT "Namespace" ; ns = dirpath ->
          { VernacPrint (PrintNamespace ns) }
      | IDENT "Inspect"; n = natural -> { VernacPrint (PrintInspect n) }

      | 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) }

      (* For acting on parameter tables *)
      | "Set"; table = option_table; v = option_value ->
          { VernacSetOption (false, table, v) }
      | IDENT "Unset"; table = option_table ->
          { VernacUnsetOption (false, table) }

      | IDENT "Print"; IDENT "Table"; table = option_table ->
	  { VernacPrintOption table }

      | IDENT "Add"; table = IDENT; field = IDENT; v = LIST1 option_ref_value
        -> { VernacAddOption ([table;field], v) }
      (* A global value below will be hidden by a field above! *)
      (* In fact, we give priority to secondary tables *)
      (* No syntax for tertiary tables due to conflict *)
      (* (but they are unused anyway) *)
      | IDENT "Add"; table = IDENT; v = LIST1 option_ref_value ->
          { VernacAddOption ([table], v) }

      | IDENT "Test"; table = option_table; "for"; v = LIST1 option_ref_value
        -> { VernacMemOption (table, v) }
      | IDENT "Test"; table = option_table ->
          { VernacPrintOption table }

      | IDENT "Remove"; table = IDENT; field = IDENT; v= LIST1 option_ref_value
        -> { VernacRemoveOption ([table;field], v) }
      | IDENT "Remove"; table = IDENT; v = LIST1 option_ref_value ->
	  { VernacRemoveOption ([table], v) } ]]
  ;
  query_command: (* TODO: rapprocher Eval et Check *)
    [ [ IDENT "Eval"; r = red_expr; "in"; c = lconstr; "." ->
          { fun g -> VernacCheckMayEval (Some r, g, c) }
      | IDENT "Compute"; c = lconstr; "." ->
	  { fun g -> VernacCheckMayEval (Some (Genredexpr.CbvVm None), g, c) }
      | IDENT "Check"; c = lconstr; "." ->
	 { fun g -> VernacCheckMayEval (None, g, c) }
      (* Searching the environment *)
      | IDENT "About"; qid = smart_global; l = OPT univ_name_list; "." ->
         { fun g -> VernacPrint (PrintAbout (qid,l,g)) }
      | IDENT "SearchHead"; c = constr_pattern; l = in_or_out_modules; "." ->
	  { fun g -> VernacSearch (SearchHead c,g, l) }
      | IDENT "SearchPattern"; c = constr_pattern; l = in_or_out_modules; "." ->
	  { fun g -> VernacSearch (SearchPattern c,g, l) }
      | IDENT "SearchRewrite"; c = constr_pattern; l = in_or_out_modules; "." ->
	  { fun g -> VernacSearch (SearchRewrite c,g, l) }
      | IDENT "Search"; s = searchabout_query; l = searchabout_queries; "." ->
	  { let (sl,m) = l in fun g -> VernacSearch (SearchAbout (s::sl),g, m) }
      (* compatibility: SearchAbout *)
      | IDENT "SearchAbout"; s = searchabout_query; l = searchabout_queries; "." ->
	  { fun g -> let (sl,m) = l in VernacSearch (SearchAbout (s::sl),g, m) }
      (* compatibility: SearchAbout with "[ ... ]" *)
      | IDENT "SearchAbout"; "["; sl = LIST1 searchabout_query; "]";
	l = in_or_out_modules; "." ->
         { fun g -> VernacSearch (SearchAbout sl,g, l) }
      ] ]
  ;
  printable:
    [ [ IDENT "Term"; qid = smart_global; l = OPT univ_name_list -> { PrintName (qid,l) }
      | 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"; dir = OPT dirpath -> { PrintLoadPath dir }
      | IDENT "Modules" ->
          { user_err Pp.(str "Print Modules is obsolete; use Print Libraries instead") }
      | IDENT "Libraries" -> { PrintModules }

      | IDENT "ML"; IDENT "Path" -> { PrintMLLoadPath }
      | IDENT "ML"; IDENT "Modules" -> { PrintMLModules }
      | IDENT "Debug"; IDENT "GC" -> { PrintDebugGC }
      | IDENT "Graph" -> { PrintGraph }
      | IDENT "Classes" -> {  PrintClasses }
      | IDENT "TypeClasses" -> { PrintTypeClasses }
      | IDENT "Instances"; qid = smart_global -> { PrintInstances 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 }
      | IDENT "Options" -> { PrintTables (* A Synonymous to Tables *) }
      | IDENT "Hint" -> { PrintHintGoal }
      | IDENT "Hint"; qid = smart_global -> { PrintHint qid }
      | IDENT "Hint"; "*" -> { PrintHintDb }
      | IDENT "HintDb"; s = IDENT -> { PrintHintDbName s }
      | IDENT "Scopes" -> { PrintScopes }
      | IDENT "Scope"; s = IDENT -> { PrintScope s }
      | IDENT "Visibility"; s = OPT IDENT -> { PrintVisibility s }
      | IDENT "Implicit"; qid = smart_global -> { PrintImplicit qid }
      | IDENT "Universes"; fopt = OPT ne_string -> { PrintUniverses (false, fopt) }
      | IDENT "Sorted"; IDENT "Universes"; fopt = OPT ne_string -> { PrintUniverses (true, fopt) }
      | IDENT "Assumptions"; qid = smart_global -> { PrintAssumptions (false, false, qid) }
      | IDENT "Opaque"; IDENT "Dependencies"; qid = smart_global -> { PrintAssumptions (true, false, qid) }
      | IDENT "Transparent"; IDENT "Dependencies"; qid = smart_global -> { PrintAssumptions (false, true, qid) }
      | IDENT "All"; IDENT "Dependencies"; qid = smart_global -> { PrintAssumptions (true, true, qid) }
      | IDENT "Strategy"; qid = smart_global -> { PrintStrategy (Some qid) }
      | IDENT "Strategies" -> { PrintStrategy None } ] ]
  ;
  class_rawexpr:
    [ [ IDENT "Funclass" -> { FunClass }
      | IDENT "Sortclass" -> { SortClass }
      | qid = smart_global -> { RefClass qid } ] ]
  ;
  locatable:
    [ [ qid = smart_global -> { LocateAny qid }
      | IDENT "Term"; qid = smart_global -> { LocateTerm qid }
      | IDENT "File"; f = ne_string -> { LocateFile f }
      | IDENT "Library"; qid = global -> { LocateLibrary qid }
      | IDENT "Module"; qid = global -> { LocateModule qid } ] ]
  ;
  option_value:
    [ [ -> { BoolValue true }
      | n  = integer   -> { IntValue (Some n) }
      | s  = STRING    -> { StringValue s } ] ]
  ;
  option_ref_value:
    [ [ id = global   -> { QualidRefValue id }
      | s  = STRING   -> { StringRefValue s } ] ]
  ;
  option_table:
    [ [ fl = LIST1 [ x = IDENT -> { x } ] -> { fl } ]]
  ;
  as_dirpath:
    [ [ d = OPT [ "as"; d = dirpath -> { d } ] -> { d } ] ]
  ;
  ne_in_or_out_modules:
    [ [ IDENT "inside"; l = LIST1 global -> { SearchInside l }
      | IDENT "outside"; l = LIST1 global -> { SearchOutside l } ] ]
  ;
  in_or_out_modules:
    [ [ m = ne_in_or_out_modules -> { m }
      | -> { SearchOutside [] } ] ]
  ;
  comment:
    [ [ c = constr -> { CommentConstr c }
      | s = STRING -> { CommentString s }
      | n = natural -> { CommentInt n } ] ]
  ;
  positive_search_mark:
    [ [ "-" -> { false } | -> { true } ] ]
  ;
  scope:
    [ [ "%"; key = IDENT -> { key } ] ]
  ;
  searchabout_query:
    [ [ b = positive_search_mark; s = ne_string; sc = OPT scope ->
            { (b, SearchString (s,sc)) }
      | b = positive_search_mark; p = constr_pattern ->
            { (b, SearchSubPattern p) }
      ] ]
  ;
  searchabout_queries:
    [ [ m = ne_in_or_out_modules -> { ([],m) }
      | s = searchabout_query; l = searchabout_queries ->
        { let (sl,m) = l in (s::sl,m) }
      | -> { ([],SearchOutside []) }
      ] ]
  ;
  univ_name_list:
    [ [  "@{" ; l = LIST0 name; "}" -> { l } ] ]
  ;
END

GRAMMAR EXTEND Gram
  GLOBAL: command;

  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"; IDENT "Initial" -> { VernacResetInitial }
      | IDENT "Reset"; id = identref -> { VernacResetName id }
      | IDENT "Back" -> { VernacBack 1 }
      | IDENT "Back"; n = natural -> { VernacBack n }
      | IDENT "BackTo"; n = natural -> { VernacBackTo n }

(* Tactic Debugger *)
      |	IDENT "Debug"; IDENT "On" ->
          { VernacSetOption (false, ["Ltac";"Debug"], BoolValue true) }

      |	IDENT "Debug"; IDENT "Off" ->
          { VernacSetOption (false, ["Ltac";"Debug"], BoolValue false) }

(* registration of a custom reduction *)

      | IDENT "Declare"; IDENT "Reduction"; s = IDENT; ":=";
         r = red_expr ->
	   { VernacDeclareReduction (s,r) }

 ] ];
    END

(* Grammar extensions *)

GRAMMAR EXTEND Gram
  GLOBAL: syntax;

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

     | IDENT "Close"; IDENT "Scope"; sc = IDENT ->
         { VernacOpenCloseScope (false,sc) }

     | IDENT "Delimit"; IDENT "Scope"; sc = IDENT; "with"; key = IDENT ->
	 { VernacDelimiters (sc, Some key) }
     | IDENT "Undelimit"; IDENT "Scope"; sc = IDENT ->
	 { VernacDelimiters (sc, None) }

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

     | IDENT "Infix"; op = ne_lstring; ":="; p = constr;
         modl = [ "("; l = LIST1 syntax_modifier SEP ","; ")" -> { l } | -> { [] } ];
	 sc = OPT [ ":"; sc = IDENT -> { sc } ] ->
         { VernacInfix ((op,modl),p,sc) }
     | IDENT "Notation"; id = identref;
	 idl = LIST0 ident; ":="; c = constr; b = only_parsing ->
           { VernacSyntacticDefinition
             (id,(idl,c),b) }
     | IDENT "Notation"; s = lstring; ":=";
	 c = constr;
         modl = [ "("; l = LIST1 syntax_modifier SEP ","; ")" -> { l } | -> { [] } ];
	 sc = OPT [ ":"; sc = IDENT -> { sc } ] ->
           { VernacNotation (c,(s,modl),sc) }
     | IDENT "Format"; IDENT "Notation"; n = STRING; s = STRING; fmt = STRING ->
           { VernacNotationAddFormat (n,s,fmt) }

     | IDENT "Reserved"; IDENT "Infix"; s = ne_lstring;
	 l = [ "("; l = LIST1 syntax_modifier SEP ","; ")" -> { l } | -> { [] } ] ->
           { let s = CAst.map (fun s -> "x '"^s^"' y") s in
           VernacSyntaxExtension (true,(s,l)) }

     | IDENT "Reserved"; IDENT "Notation";
	 s = ne_lstring;
	 l = [ "("; l = LIST1 syntax_modifier SEP ","; ")" -> { l } | -> { [] } ]
         -> { VernacSyntaxExtension (false, (s,l)) }

     (* "Print" "Grammar" should be here but is in "command" entry in order
        to factorize with other "Print"-based vernac entries *)
  ] ]
  ;
  only_parsing:
    [ [ "("; IDENT "only"; IDENT "parsing"; ")" ->
         { Some Flags.Current }
      | "("; IDENT "compat"; s = STRING; ")" ->
         { Some (parse_compat_version s) }
      | -> { None } ] ]
  ;
  level:
    [ [ IDENT "level"; n = natural -> { NumLevel n }
      | IDENT "next"; IDENT "level" -> { NextLevel } ] ]
  ;
  syntax_modifier:
    [ [ "at"; IDENT "level"; n = natural -> { SetLevel n }
      | IDENT "left"; IDENT "associativity" -> { SetAssoc LeftA }
      | IDENT "right"; IDENT "associativity" -> { SetAssoc RightA }
      | IDENT "no"; IDENT "associativity" -> { SetAssoc NonA }
      | IDENT "only"; IDENT "printing" -> { SetOnlyPrinting }
      | IDENT "only"; IDENT "parsing" -> { SetOnlyParsing }
      | IDENT "compat"; s = STRING ->
        { SetCompatVersion (parse_compat_version s) }
      | IDENT "format"; s1 = [s = STRING -> { CAst.make ~loc s } ];
                        s2 = OPT [s = STRING -> { CAst.make ~loc s } ] ->
          { begin match s1, s2 with
          | { CAst.v = k }, Some s -> SetFormat(k,s)
          | s, None -> SetFormat ("text",s) end }
      | x = IDENT; ","; l = LIST1 [id = IDENT -> { id } ] SEP ","; "at";
        lev = level -> { SetItemLevel (x::l,lev) }
      | x = IDENT; "at"; lev = level -> { SetItemLevel ([x],lev) }
      | x = IDENT; "at"; lev = level; b = constr_as_binder_kind -> { SetItemLevelAsBinder ([x],b,Some lev) }
      | x = IDENT; b = constr_as_binder_kind -> { SetItemLevelAsBinder ([x],b,None) }
      | x = IDENT; typ = syntax_extension_type -> { SetEntryType (x,typ) }
    ] ]
  ;
  syntax_extension_type:
    [ [ IDENT "ident" -> { ETName } | IDENT "global" -> { ETReference }
      | IDENT "bigint" -> { ETBigint }
      | IDENT "binder" -> { ETBinder true }
      | IDENT "constr"; n = OPT at_level; b = constr_as_binder_kind -> { ETConstrAsBinder (b,n) }
      | IDENT "pattern" -> { ETPattern (false,None) }
      | IDENT "pattern"; "at"; IDENT "level"; n = natural -> { ETPattern (false,Some n) }
      | IDENT "strict"; IDENT "pattern" -> { ETPattern (true,None) }
      | IDENT "strict"; IDENT "pattern"; "at"; IDENT "level"; n = natural -> { ETPattern (true,Some n) }
      | IDENT "closed"; IDENT "binder" -> { ETBinder false }
    ] ]
  ;
  at_level:
    [ [ "at"; n = level -> { n } ] ]
  ;
  constr_as_binder_kind:
    [ [ "as"; IDENT "ident" -> { Notation_term.AsIdent }
      | "as"; IDENT "pattern" -> { Notation_term.AsIdentOrPattern }
      | "as"; IDENT "strict"; IDENT "pattern" -> { Notation_term.AsStrictPattern } ] ]
  ;
END