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|
(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2010 *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
(*i camlp4use: "pa_extend.cmo q_MLast.cmo" i*)
(* $Id: vernacextend.ml4 13323 2010-07-24 15:57:30Z herbelin $ *)
open Util
open Genarg
open Q_util
open Q_coqast
open Argextend
open Tacextend
open Pcoq
open Egrammar
let rec make_let e = function
| [] -> e
| GramNonTerminal(loc,t,_,Some p)::l ->
let p = Names.string_of_id p in
let loc = join_loc loc (MLast.loc_of_expr e) in
let e = make_let e l in
<:expr< let $lid:p$ = Genarg.out_gen $make_rawwit loc t$ $lid:p$ in $e$ >>
| _::l -> make_let e l
let add_clause s (_,pt,e) l =
let p = make_patt pt in
let w = Some (make_when (MLast.loc_of_expr e) pt) in
(p, w, make_let e pt)::l
let check_unicity s l =
let l' = List.map (fun (_,l,_) -> extract_signature l) l in
if not (Util.list_distinct l') then
Pp.warning_with !Pp_control.err_ft
("Two distinct rules of entry "^s^" have the same\n"^
"non-terminals in the same order: put them in distinct vernac entries")
let make_clauses s l =
check_unicity s l;
let default =
(<:patt< _ >>,None,<:expr< failwith "Vernac extension: cannot occur" >>) in
List.fold_right (add_clause s) l [default]
let mlexpr_of_clause =
mlexpr_of_list
(fun (a,b,c) -> mlexpr_of_list make_prod_item (GramTerminal a::b))
let declare_command loc s cl =
let gl = mlexpr_of_clause cl in
let icl = make_clauses s cl in
<:str_item<
declare
open Pcoq;
open Extrawit;
try Vernacinterp.vinterp_add $mlexpr_of_string s$ (fun [ $list:icl$ ])
with e -> Pp.pp (Cerrors.explain_exn e);
Egrammar.extend_vernac_command_grammar $mlexpr_of_string s$ $gl$;
end
>>
open Pcaml
EXTEND
GLOBAL: str_item;
str_item:
[ [ "VERNAC"; "COMMAND"; "EXTEND"; s = UIDENT;
OPT "|"; l = LIST1 rule SEP "|";
"END" ->
declare_command loc s l ] ]
;
rule:
[ [ "["; s = STRING; l = LIST0 args; "]"; "->"; "["; e = Pcaml.expr; "]"
->
if s = "" then Util.user_err_loc (loc,"",Pp.str"Command name is empty.");
(s,l,<:expr< fun () -> $e$ >>)
] ]
;
args:
[ [ e = LIDENT; "("; s = LIDENT; ")" ->
let t, g = interp_entry_name false None e "" in
GramNonTerminal (loc, t, g, Some (Names.id_of_string s))
| e = LIDENT; "("; s = LIDENT; ","; sep = STRING; ")" ->
let t, g = interp_entry_name false None e sep in
GramNonTerminal (loc, t, g, Some (Names.id_of_string s))
| s = STRING ->
GramTerminal s
] ]
;
END
;;
|
