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|
(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2017 *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
(** Implementation of the TACTIC EXTEND macro. *)
open Q_util
open Argextend
(** Quotation difference for match clauses *)
let default_patt loc =
(<:patt< _ >>, ploc_vala None, <:expr< failwith "Extension: cannot occur" >>)
let make_fun loc cl =
let l = cl @ [default_patt loc] in
MLast.ExFun (loc, ploc_vala l) (* correspond to <:expr< fun [ $list:l$ ] >> *)
let plugin_name = <:expr< __coq_plugin_name >>
let mlexpr_of_ident id =
(** Workaround for badly-designed generic arguments lacking a closure *)
let id = "$" ^ id in
<:expr< Names.Id.of_string_soft $str:id$ >>
let rec make_patt = function
| [] -> <:patt< [] >>
| ExtNonTerminal (_, Some p) :: l ->
<:patt< [ $lid:p$ :: $make_patt l$ ] >>
| _::l -> make_patt l
let rec make_let raw e = function
| [] -> <:expr< fun $lid:"ist"$ -> $e$ >>
| ExtNonTerminal (g, Some p) :: l ->
let t = type_of_user_symbol g in
let loc = MLast.loc_of_expr e in
let e = make_let raw e l in
let v =
if raw then <:expr< Genarg.out_gen $make_rawwit loc t$ $lid:p$ >>
else <:expr< Tacinterp.Value.cast $make_topwit loc t$ $lid:p$ >> in
<:expr< let $lid:p$ = $v$ in $e$ >>
| _::l -> make_let raw e l
let make_clause (pt,_,e) =
(make_patt pt,
ploc_vala None,
make_let false e pt)
let make_fun_clauses loc s l =
let map c = make_fun loc [make_clause c] in
mlexpr_of_list map l
let get_argt e = <:expr< (fun e -> match e with [ Genarg.ExtraArg tag -> tag | _ -> assert False ]) $e$ >>
let rec mlexpr_of_symbol = function
| Ulist1 s -> <:expr< Extend.Ulist1 $mlexpr_of_symbol s$ >>
| Ulist1sep (s,sep) -> <:expr< Extend.Ulist1sep $mlexpr_of_symbol s$ $str:sep$ >>
| Ulist0 s -> <:expr< Extend.Ulist0 $mlexpr_of_symbol s$ >>
| Ulist0sep (s,sep) -> <:expr< Extend.Ulist0sep $mlexpr_of_symbol s$ $str:sep$ >>
| Uopt s -> <:expr< Extend.Uopt $mlexpr_of_symbol s$ >>
| Uentry e ->
let arg = get_argt <:expr< $lid:"wit_"^e$ >> in
<:expr< Extend.Uentry (Genarg.ArgT.Any $arg$) >>
| Uentryl (e, l) ->
assert (e = "tactic");
let arg = get_argt <:expr< Tacarg.wit_tactic >> in
<:expr< Extend.Uentryl (Genarg.ArgT.Any $arg$) $mlexpr_of_int l$>>
let make_prod_item = function
| ExtTerminal s -> <:expr< Tacentries.TacTerm $str:s$ >>
| ExtNonTerminal (g, id) ->
<:expr< Tacentries.TacNonTerm (Loc.tag ( $mlexpr_of_symbol g$ , $mlexpr_of_option mlexpr_of_ident id$ ) ) >>
let mlexpr_of_clause cl =
mlexpr_of_list (fun (a,_,_) -> mlexpr_of_list make_prod_item a) cl
(** Special treatment of constr entries *)
let is_constr_gram = function
| ExtTerminal _ -> false
| ExtNonTerminal (Uentry "constr", _) -> true
| _ -> false
let make_var = function
| ExtNonTerminal (_, p) -> p
| _ -> assert false
let declare_tactic loc tacname ~level classification clause = match clause with
| [(ExtTerminal name) :: rem, _, tac] when List.for_all is_constr_gram rem ->
(** The extension is only made of a name followed by constr entries: we do not
add any grammar nor printing rule and add it as a true Ltac definition. *)
let patt = make_patt rem in
let vars = List.map make_var rem in
let vars = mlexpr_of_list (mlexpr_of_name mlexpr_of_ident) vars in
let entry = mlexpr_of_string tacname in
let se = <:expr< { Tacexpr.mltac_tactic = $entry$; Tacexpr.mltac_plugin = $plugin_name$ } >> in
let ml = <:expr< { Tacexpr.mltac_name = $se$; Tacexpr.mltac_index = 0 } >> in
let name = mlexpr_of_string name in
let tac = match rem with
| [] ->
(** Special handling of tactics without arguments: such tactics do not do
a Proofview.Goal.nf_enter to compute their arguments. It matters for some
whole-prof tactics like [shelve_unifiable]. *)
<:expr< fun _ $lid:"ist"$ -> $tac$ >>
| _ ->
let f = make_fun loc [patt, ploc_vala None, <:expr< fun $lid:"ist"$ -> $tac$ >>] in
<:expr< Tacinterp.lift_constr_tac_to_ml_tac $vars$ $f$ >>
in
(** Arguments are not passed directly to the ML tactic in the TacML node,
the ML tactic retrieves its arguments in the [ist] environment instead.
This is the rôle of the [lift_constr_tac_to_ml_tac] function. *)
let body = <:expr< Tacexpr.TacFun ($vars$, Tacexpr.TacML (Loc.tag ( $ml$ , []))) >> in
let name = <:expr< Names.Id.of_string $name$ >> in
declare_str_items loc
[ <:str_item< do {
let obj () = Tacenv.register_ltac True False $name$ $body$ in
let () = Tacenv.register_ml_tactic $se$ [|$tac$|] in
Mltop.declare_cache_obj obj $plugin_name$ } >>
]
| _ ->
(** Otherwise we add parsing and printing rules to generate a call to a
TacML tactic. *)
let entry = mlexpr_of_string tacname in
let se = <:expr< { Tacexpr.mltac_tactic = $entry$; Tacexpr.mltac_plugin = $plugin_name$ } >> in
let gl = mlexpr_of_clause clause in
let level = mlexpr_of_int level in
let obj = <:expr< fun () -> Tacentries.add_ml_tactic_notation $se$ ~{ level = $level$ } $gl$ >> in
declare_str_items loc
[ <:str_item< do {
Tacenv.register_ml_tactic $se$ (Array.of_list $make_fun_clauses loc tacname clause$);
Mltop.declare_cache_obj $obj$ $plugin_name$; } >>
]
open Pcaml
EXTEND
GLOBAL: str_item;
str_item:
[ [ "TACTIC"; "EXTEND"; s = tac_name;
level = OPT [ "AT"; UIDENT "LEVEL"; level = INT -> level ];
c = OPT [ "CLASSIFIED"; "BY"; c = LIDENT -> <:expr< $lid:c$ >> ];
OPT "|"; l = LIST1 tacrule SEP "|";
"END" ->
let level = match level with Some i -> int_of_string i | None -> 0 in
declare_tactic loc s ~level c l ] ]
;
tacrule:
[ [ "["; l = LIST1 tacargs; "]";
c = OPT [ "=>"; "["; c = Pcaml.expr; "]" -> c ];
"->"; "["; e = Pcaml.expr; "]" -> (l,c,e)
] ]
;
tacargs:
[ [ e = LIDENT; "("; s = LIDENT; ")" ->
let e = parse_user_entry e "" in
ExtNonTerminal (e, Some s)
| e = LIDENT; "("; s = LIDENT; ","; sep = STRING; ")" ->
let e = parse_user_entry e sep in
ExtNonTerminal (e, Some s)
| e = LIDENT ->
let e = parse_user_entry e "" in
ExtNonTerminal (e, None)
| s = STRING ->
let () = if s = "" then failwith "Empty terminal." in
ExtTerminal s
] ]
;
tac_name:
[ [ s = LIDENT -> s
| s = UIDENT -> s
] ]
;
END
|
