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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: tacextend.ml4 8926 2006-06-08 20:23:17Z herbelin $ *)
open Genarg
open Q_util
open Q_coqast
open Argextend
let join_loc (deb1,_) (_,fin2) = (deb1,fin2)
let loc = Util.dummy_loc
let default_loc = <:expr< Util.dummy_loc >>
type grammar_tactic_production_expr =
| TacTerm of string
| TacNonTerm of Util.loc * Genarg.argument_type * MLast.expr * string option
let rec make_patt = function
| [] -> <:patt< [] >>
| TacNonTerm(loc',_,_,Some p)::l ->
<:patt< [ $lid:p$ :: $make_patt l$ ] >>
| _::l -> make_patt l
let rec make_when loc = function
| [] -> <:expr< True >>
| TacNonTerm(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
| TacNonTerm(loc,t,_,Some p)::l ->
let loc = join_loc loc (MLast.loc_of_expr e) in
let e = make_let e l in
let v = <:expr< Genarg.out_gen $make_wit loc t$ $lid:p$ >> in
let v =
(* Special case for tactics which must be stored in algebraic
form to avoid marshalling closures and to be reprinted *)
if Pcoq.is_tactic_genarg t then
<:expr< ($v$, Tacinterp.eval_tactic $v$) >>
else v in
<:expr< let $lid:p$ = $v$ 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
| [] -> []
| TacNonTerm (_,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 tactic entry "^s^" have the same\n"^
"non-terminals in the same order: put them in distinct tactic entries")
let make_clauses s l =
check_unicity s l;
let default =
(<:patt< _ >>,None,<:expr< failwith "Tactic extension: cannot occur" >>) in
List.fold_right (add_clause s) l [default]
let rec make_args = function
| [] -> <:expr< [] >>
| TacNonTerm(loc,t,_,Some p)::l ->
<:expr< [ Genarg.in_gen $make_wit loc t$ $lid:p$ :: $make_args l$ ] >>
| _::l -> make_args l
let rec make_eval_tactic e = function
| [] -> e
| TacNonTerm(loc,tag,_,Some p)::l when Pcoq.is_tactic_genarg tag ->
let loc = join_loc loc (MLast.loc_of_expr e) in
let e = make_eval_tactic e l in
(* Special case for tactics which must be stored in algebraic
form to avoid marshalling closures and to be reprinted *)
<:expr< let $lid:p$ = ($lid:p$,Tacinterp.eval_tactic $lid:p$) in $e$ >>
| _::l -> make_eval_tactic e l
let rec make_fun e = function
| [] -> e
| TacNonTerm(loc,_,_,Some p)::l ->
<:expr< fun $lid:p$ -> $make_fun e l$ >>
| _::l -> make_fun e l
let mlexpr_of_grammar_production = function
| TacTerm s ->
<:expr< Egrammar.TacTerm $mlexpr_of_string s$ >>
| TacNonTerm (loc,nt,g,sopt) ->
<:expr< Egrammar.TacNonTerm $default_loc$ ($g$,$mlexpr_of_argtype loc nt$) $mlexpr_of_option mlexpr_of_string sopt$ >>
let mlexpr_terminals_of_grammar_production = function
| TacTerm s -> <:expr< Some $mlexpr_of_string s$ >>
| TacNonTerm (loc,nt,g,sopt) -> <:expr< None >>
let mlexpr_of_clause =
mlexpr_of_list (fun (a,b) -> mlexpr_of_list mlexpr_of_grammar_production a)
let rec make_tags loc = function
| [] -> <:expr< [] >>
| TacNonTerm(loc',t,_,Some p)::l ->
let l = make_tags loc l in
let loc = join_loc loc' loc in
let t = mlexpr_of_argtype loc' t in
<:expr< [ $t$ :: $l$ ] >>
| _::l -> make_tags loc l
let make_one_printing_rule se (pt,e) =
let level = mlexpr_of_int 0 in (* only level 0 supported here *)
let loc = MLast.loc_of_expr e in
let prods = mlexpr_of_list mlexpr_terminals_of_grammar_production pt in
<:expr< ($se$, $make_tags loc pt$, ($level$, $prods$)) >>
let make_printing_rule se = mlexpr_of_list (make_one_printing_rule se)
let rec contains_epsilon = function
| List0ArgType _ -> true
| List1ArgType t -> contains_epsilon t
| OptArgType _ -> true
| PairArgType(t1,t2) -> contains_epsilon t1 && contains_epsilon t2
| ExtraArgType("hintbases") -> true
| _ -> false
let is_atomic = function
| TacTerm s :: l when
List.for_all (function
TacTerm _ -> false
| TacNonTerm(_,t,_,_) -> contains_epsilon t) l
-> [s]
| _ -> []
let declare_tactic loc s cl =
let se = mlexpr_of_string s in
let pp = make_printing_rule se cl in
let gl = mlexpr_of_clause cl in
let hide_tac (p,e) =
(* reste a definir les fonctions cachees avec des noms frais *)
let stac = "h_"^s in
let e =
make_fun
<:expr<
Refiner.abstract_extended_tactic $mlexpr_of_string s$ $make_args p$ $make_eval_tactic e p$
>>
p in
<:str_item< value $lid:stac$ = $e$ >>
in
let hidden = if List.length cl = 1 then List.map hide_tac cl else [] in
let atomic_tactics =
mlexpr_of_list mlexpr_of_string
(List.flatten (List.map (fun (al,_) -> is_atomic al) cl)) in
<:str_item<
declare
open Pcoq;
declare $list:hidden$ end;
try
let _=Refiner.add_tactic $se$ (fun [ $list:make_clauses s cl$ ]) in
List.iter
(fun s -> Tacinterp.add_primitive_tactic s
(Tacexpr.TacAtom($default_loc$,
Tacexpr.TacExtend($default_loc$,s,[]))))
$atomic_tactics$
with e -> Pp.pp (Cerrors.explain_exn e);
Egrammar.extend_tactic_grammar $se$ $gl$;
List.iter Pptactic.declare_extra_tactic_pprule $pp$;
end
>>
open Pcaml
EXTEND
GLOBAL: str_item;
str_item:
[ [ "TACTIC"; "EXTEND"; s = [ UIDENT | LIDENT ];
OPT "|"; l = LIST1 tacrule SEP "|";
"END" ->
declare_tactic loc s l ] ]
;
tacrule:
[ [ "["; l = LIST1 tacargs; "]"; "->"; "["; e = Pcaml.expr; "]"
->
if match List.hd l with TacNonTerm _ -> true | _ -> false then
(* En attendant la syntaxe de tacticielles *)
failwith "Tactic syntax must start with an identifier";
(l,e)
] ]
;
tacargs:
[ [ e = LIDENT; "("; s = LIDENT; ")" ->
let t, g = Q_util.interp_entry_name loc e in
TacNonTerm (loc, t, g, Some s)
| s = STRING ->
if s = "" then Util.user_err_loc (loc,"",Pp.str "Empty terminal");
TacTerm s
] ]
;
END
|
