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|
(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2016 *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
(*i camlp4deps: "tools/compat5b.cmo" i*)
(** Implementation of the TACTIC EXTEND macro. *)
open Q_util
open Argextend
open Compat
let dloc = <:expr< Loc.ghost >>
let plugin_name = <:expr< __coq_plugin_name >>
let rec make_patt = function
| [] -> <:patt< [] >>
| ExtNonTerminal (_, 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, 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,
vala None,
make_let false e pt)
let make_fun_clauses loc s l =
let map c = Compat.make_fun loc [make_clause c] in
mlexpr_of_list map l
let make_prod_item = function
| ExtTerminal s -> <:expr< Egramml.GramTerminal $str:s$ >>
| ExtNonTerminal (g, id) ->
let nt = type_of_user_symbol g in
let base s = <:expr< Pcoq.name_of_entry (Pcoq.genarg_grammar $mk_extraarg loc s$) >> in
<:expr< Egramml.GramNonTerminal $default_loc$ $make_rawwit loc nt$
$mlexpr_of_prod_entry_key base g$ >>
let mlexpr_of_clause cl =
mlexpr_of_list (fun (a,_,_) -> mlexpr_of_list make_prod_item a) cl
let make_one_printing_rule (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 make_prod_item pt in
<:expr< { Pptactic.pptac_level = $level$;
pptac_prods = $prods$ } >>
let make_printing_rule r = mlexpr_of_list make_one_printing_rule r
(** Special treatment of constr entries *)
let is_constr_gram = function
| ExtTerminal _ -> false
| ExtNonTerminal (Uentry "constr", _) -> true
| _ -> false
let make_var = function
| ExtNonTerminal (_, p) -> Some p
| _ -> assert false
let declare_tactic loc s c cl = match cl 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_option mlexpr_of_ident) vars in
let entry = mlexpr_of_string s 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 = Compat.make_fun loc [patt, 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 ($dloc$, $ml$, [])) >> 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
try do {
Tacenv.register_ml_tactic $se$ [|$tac$|];
Mltop.declare_cache_obj obj $plugin_name$; }
with [ e when Errors.noncritical e ->
Pp.msg_warning
(Pp.app
(Pp.str ("Exception in tactic extend " ^ $entry$ ^": "))
(Errors.print e)) ]; } >>
]
| _ ->
(** Otherwise we add parsing and printing rules to generate a call to a
TacML tactic. *)
let entry = mlexpr_of_string s in
let se = <:expr< { Tacexpr.mltac_tactic = $entry$; Tacexpr.mltac_plugin = $plugin_name$ } >> in
let pp = make_printing_rule cl in
let gl = mlexpr_of_clause cl in
let obj = <:expr< fun () -> Metasyntax.add_ml_tactic_notation $se$ $gl$ >> in
declare_str_items loc
[ <:str_item< do {
try do {
Tacenv.register_ml_tactic $se$ (Array.of_list $make_fun_clauses loc s cl$);
Mltop.declare_cache_obj $obj$ $plugin_name$;
Pptactic.declare_ml_tactic_pprule $se$ (Array.of_list $pp$); }
with [ e when Errors.noncritical e ->
Pp.msg_warning
(Pp.app
(Pp.str ("Exception in tactic extend " ^ $entry$ ^": "))
(Errors.print e)) ]; } >>
]
open Pcaml
open PcamlSig (* necessary for camlp4 *)
EXTEND
GLOBAL: str_item;
str_item:
[ [ "TACTIC"; "EXTEND"; s = tac_name;
c = OPT [ "CLASSIFIED"; "BY"; c = LIDENT -> <:expr< $lid:c$ >> ];
OPT "|"; l = LIST1 tacrule SEP "|";
"END" ->
declare_tactic loc s c l ] ]
;
tacrule:
[ [ "["; l = LIST1 tacargs; "]";
c = OPT [ "=>"; "["; c = Pcaml.expr; "]" -> c ];
"->"; "["; e = Pcaml.expr; "]" ->
(match l with
| ExtNonTerminal _ :: _ ->
(* En attendant la syntaxe de tacticielles *)
failwith "Tactic syntax must start with an identifier"
| _ -> (l,c,e))
] ]
;
tacargs:
[ [ e = LIDENT; "("; s = LIDENT; ")" ->
let e = parse_user_entry e "" in
ExtNonTerminal (e, s)
| e = LIDENT; "("; s = LIDENT; ","; sep = STRING; ")" ->
let e = parse_user_entry e sep in
ExtNonTerminal (e, s)
| s = STRING ->
let () = if s = "" then failwith "Empty terminal." in
ExtTerminal s
] ]
;
tac_name:
[ [ s = LIDENT -> s
| s = UIDENT -> s
] ]
;
END
|
