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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 *)
(************************************************************************)
(*i camlp4use: "pa_extend.cmo q_MLast.cmo" i*)
(* $Id$ *)
open Util
open Genarg
open Q_util
open Q_coqast
open Argextend
let loc = Util.dummy_loc
let default_loc = <:expr< Util.dummy_loc >>
type grammar_tactic_production_expr =
| VernacTerm of string
| VernacNonTerm of Util.loc * Genarg.argument_type * MLast.expr * string option
let rec make_patt = function
| [] -> <:patt< [] >>
| VernacNonTerm(_,_,_,Some p)::l ->
<:patt< [ $lid:p$ :: $make_patt l$ ] >>
| _::l -> make_patt l
let rec make_when loc = function
| [] -> <:expr< True >>
| VernacNonTerm(loc',t,_,Some p)::l ->
let l = make_when loc l in
let loc = join_loc loc' loc in
let t = mlexpr_of_argtype loc' t in
<:expr< Genarg.genarg_tag $lid:p$ = $t$ && $l$ >>
| _::l -> make_when loc l
let rec make_let e = function
| [] -> e
| VernacNonTerm(loc,t,_,Some p)::l ->
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 rec extract_signature = function
| [] -> []
| VernacNonTerm (_,t,_,_) :: l -> t :: extract_signature l
| _::l -> extract_signature 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 rec make_fun e = function
| [] -> e
| VernacNonTerm(loc,_,_,Some p)::l ->
<:expr< fun $lid:p$ -> $make_fun e l$ >>
| _::l -> make_fun e l
let mlexpr_of_grammar_production = function
| VernacTerm s ->
<:expr< Egrammar.TacTerm $mlexpr_of_string s$ >>
| VernacNonTerm (loc,nt,g,sopt) ->
<:expr< Egrammar.TacNonTerm $default_loc$ ($g$,$mlexpr_of_argtype loc nt$) $mlexpr_of_option mlexpr_of_string sopt$ >>
let mlexpr_of_clause =
mlexpr_of_list
(fun (a,b,c) ->
mlexpr_of_list mlexpr_of_grammar_production (VernacTerm 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;
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 = Q_util.interp_entry_name loc e "" in
VernacNonTerm (loc, t, g, Some s)
| s = STRING ->
VernacTerm s
] ]
;
END
;;
|
