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|
(***********************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA-Rocquencourt & LRI-CNRS-Orsay *)
(* \VV/ *************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(***********************************************************************)
(* $Id$ *)
open Pcoq
open Constr
open Topconstr
open Term
open Libnames
open Prim
let pair loc =
Qualid (loc, Libnames.qualid_of_string "Coq.Init.Datatypes.pair")
GEXTEND Gram
GLOBAL: constr1 pattern;
pattern:
[ [ r = Prim.reference -> CPatAtom (loc,Some r)
| IDENT "_" -> CPatAtom (loc,None)
(* Hack to parse syntax "(n)" as a natural number *)
| "("; G_constr.test_int_rparen; n = INT; ")" ->
let n = CPatNumeral (loc,Bignat.POS (Bignat.of_string n)) in
CPatDelimiters (loc,"nat_scope",n)
| "("; p = compound_pattern; ")" -> p
| n = INT -> CPatNumeral (loc,Bignat.POS (Bignat.of_string n))
| "-"; n = INT -> CPatNumeral (loc,Bignat.NEG (Bignat.of_string n))
] ]
;
compound_pattern:
[ [ p = pattern ; lp = LIST1 pattern ->
(match p with
| CPatAtom (_, Some r) -> CPatCstr (loc, r, lp)
| _ -> Util.user_err_loc
(loc, "compound_pattern", Pp.str "Constructor expected"))
| p = pattern; "as"; id = base_ident ->
CPatAlias (loc, p, id)
| p1 = pattern; ","; p2 = pattern ->
CPatCstr (loc, pair loc, [p1; p2])
| p = pattern -> p ] ]
;
equation:
[ [ lhs = LIST1 pattern; "=>"; rhs = constr9 -> (loc,lhs,rhs) ] ]
;
ne_eqn_list:
[ [ leqn = LIST1 equation SEP "|" -> leqn ] ]
;
constr1:
[ [ "<"; p = lconstr; ">"; "Cases"; lc = LIST1 constr; "of";
OPT "|"; eqs = ne_eqn_list; "end" ->
CCases (loc, Some p, lc, eqs)
| "Cases"; lc = ne_constr_list; "of";
OPT "|"; eqs = ne_eqn_list; "end" ->
CCases (loc, None, lc, eqs)
| "<"; p = lconstr; ">"; "Cases"; lc = ne_constr_list; "of"; "end" ->
CCases (loc, Some p, lc, [])
| "Cases"; lc = ne_constr_list; "of"; "end" ->
CCases (loc, None, lc, []) ] ]
;
END;
|
