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|
(************************************************************************)
(* 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: g_cases.ml4,v 1.27.2.1 2004/07/16 19:30:38 herbelin Exp $ *)
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")
if !Options.v7 then
GEXTEND Gram
GLOBAL: operconstr 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 = bigint; ")" ->
(* Delimiter "N" moved to "nat" in V7 *)
CPatDelimiters (loc,"nat",CPatNumeral (loc,n))
| "("; p = compound_pattern; ")" -> p
| n = bigint -> CPatNumeral (loc,n)
| "'"; G_constr.test_ident_colon; key = IDENT; ":"; c = pattern; "'" ->
CPatDelimiters (loc,key,c)
] ]
;
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 = operconstr LEVEL "9" -> (loc,lhs,rhs) ] ]
;
ne_eqn_list:
[ [ leqn = LIST1 equation SEP "|" -> leqn ] ]
;
operconstr: LEVEL "1"
[ [ "<"; p = annot; ">"; "Cases"; lc = LIST1 constr; "of";
OPT "|"; eqs = ne_eqn_list; "end" ->
let lc = List.map (fun c -> c,(None,None)) lc in
CCases (loc, (Some p,None), lc, eqs)
| "Cases"; lc = LIST1 constr; "of";
OPT "|"; eqs = ne_eqn_list; "end" ->
let lc = List.map (fun c -> c,(None,None)) lc in
CCases (loc, (None,None), lc, eqs)
| "<"; p = annot; ">"; "Cases"; lc = LIST1 constr; "of"; "end" ->
let lc = List.map (fun c -> c,(None,None)) lc in
CCases (loc, (Some p,None), lc, [])
| "Cases"; lc = LIST1 constr; "of"; "end" ->
let lc = List.map (fun c -> c,(None,None)) lc in
CCases (loc, (None,None), lc, []) ] ]
;
END;
|
