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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 *)
(************************************************************************)
(** Implementation of the VERNAC EXTEND macro. *)
open Q_util
open Argextend
open Tacextend
open GramCompat
type rule = {
r_head : string option;
(** The first terminal grammar token *)
r_patt : extend_token list;
(** The remaining tokens of the parsing rule *)
r_class : MLast.expr option;
(** An optional classifier for the STM *)
r_branch : MLast.expr;
(** The action performed by this rule. *)
r_depr : unit option;
(** Whether this entry is deprecated *)
}
let rec make_let e = function
| [] -> 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 e l in
<:expr< let $lid:p$ = Genarg.out_gen $make_rawwit loc t$ $lid:p$ in $e$ >>
| _::l -> make_let e l
let make_clause { r_patt = pt; r_branch = e; } =
(make_patt pt,
vala None,
make_let e pt)
(* To avoid warnings *)
let mk_ignore c pt =
let fold accu = function
| ExtNonTerminal (_, p) -> p :: accu
| _ -> accu
in
let names = List.fold_left fold [] pt in
let fold accu id = <:expr< let _ = $lid:id$ in $accu$ >> in
let names = List.fold_left fold <:expr< () >> names in
<:expr< do { let _ = $names$ in $c$ } >>
let make_clause_classifier cg s { r_patt = pt; r_class = c; } =
match c ,cg with
| Some c, _ ->
(make_patt pt,
vala None,
make_let (mk_ignore c pt) pt)
| None, Some cg ->
(make_patt pt,
vala None,
<:expr< fun () -> $cg$ $str:s$ >>)
| None, None -> prerr_endline
(("Vernac entry \""^s^"\" misses a classifier. "^
"A classifier is a function that returns an expression "^
"of type vernac_classification (see Vernacexpr). You can: ") ^
"- " ^ (
("Use '... EXTEND "^s^" CLASSIFIED AS QUERY ...' if the "^
"new vernacular command does not alter the system state;"))^ "\n" ^
"- " ^ (
("Use '... EXTEND "^s^" CLASSIFIED AS SIDEFF ...' if the "^
"new vernacular command alters the system state but not the "^
"parser nor it starts a proof or ends one;"))^ "\n" ^
"- " ^ (
("Use '... EXTEND "^s^" CLASSIFIED BY f ...' to specify "^
"a global function f. The function f will be called passing "^
"\""^s^"\" as the only argument;")) ^ "\n" ^
"- " ^ (
"Add a specific classifier in each clause using the syntax:"
^ "\n" ^("'[...] => [ f ] -> [...]'. "))^ "\n" ^
("Specific classifiers have precedence over global "^
"classifiers. Only one classifier is called.") ^ "\n");
(make_patt pt,
vala None,
<:expr< fun () -> (Vernacexpr.VtUnknown, Vernacexpr.VtNow) >>)
let make_fun_clauses loc s l =
let map c =
let depr = match c.r_depr with
| None -> false
| Some () -> true
in
let cl = GramCompat.make_fun loc [make_clause c] in
<:expr< ($mlexpr_of_bool depr$, $cl$)>>
in
mlexpr_of_list map l
let make_fun_classifiers loc s c l =
let cl = List.map (fun x -> GramCompat.make_fun loc [make_clause_classifier c s x]) l in
mlexpr_of_list (fun x -> x) cl
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.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 =
let mkexpr { r_head = a; r_patt = b; } = match a with
| None -> mlexpr_of_list make_prod_item b
| Some a -> mlexpr_of_list make_prod_item (ExtTerminal a :: b)
in
mlexpr_of_list mkexpr cl
let declare_command loc s c nt cl =
let se = mlexpr_of_string s in
let gl = mlexpr_of_clause cl in
let funcl = make_fun_clauses loc s cl in
let classl = make_fun_classifiers loc s c cl in
declare_str_items loc
[ <:str_item< do {
CList.iteri (fun i (depr, f) -> Vernacinterp.vinterp_add depr ($se$, i) f) $funcl$;
CList.iteri (fun i f -> Vernac_classifier.declare_vernac_classifier ($se$, i) f) $classl$;
CList.iteri (fun i r -> Egramml.extend_vernac_command_grammar ($se$, i) $nt$ r) $gl$;
} >> ]
open Pcaml
open PcamlSig (* necessary for camlp4 *)
EXTEND
GLOBAL: str_item;
str_item:
[ [ "VERNAC"; "COMMAND"; "EXTEND"; s = UIDENT; c = OPT classification;
OPT "|"; l = LIST1 rule SEP "|";
"END" ->
declare_command loc s c <:expr<None>> l
| "VERNAC"; nt = LIDENT ; "EXTEND"; s = UIDENT; c = OPT classification;
OPT "|"; l = LIST1 rule SEP "|";
"END" ->
declare_command loc s c <:expr<Some $lid:nt$>> l
| "DECLARE"; "PLUGIN"; name = STRING ->
declare_str_items loc [
<:str_item< value __coq_plugin_name = $str:name$ >>;
<:str_item< value _ = Mltop.add_known_module $str:name$ >>;
]
] ]
;
classification:
[ [ "CLASSIFIED"; "BY"; c = LIDENT -> <:expr< $lid:c$ >>
| "CLASSIFIED"; "AS"; "SIDEFF" ->
<:expr< fun _ -> Vernac_classifier.classify_as_sideeff >>
| "CLASSIFIED"; "AS"; "QUERY" ->
<:expr< fun _ -> Vernac_classifier.classify_as_query >>
] ]
;
deprecation:
[ [ "DEPRECATED" -> () ] ]
;
(* spiwack: comment-by-guessing: it seems that the isolated string (which
otherwise could have been another argument) is not passed to the
VernacExtend interpreter function to discriminate between the clauses. *)
rule:
[ [ "["; s = STRING; l = LIST0 args; "]";
d = OPT deprecation; c = OPT classifier; "->"; "["; e = Pcaml.expr; "]" ->
let () = if s = "" then failwith "Command name is empty." in
let b = <:expr< fun () -> $e$ >> in
{ r_head = Some s; r_patt = l; r_class = c; r_branch = b; r_depr = d; }
| "[" ; "-" ; l = LIST1 args ; "]" ;
d = OPT deprecation; c = OPT classifier; "->"; "["; e = Pcaml.expr; "]" ->
let b = <:expr< fun () -> $e$ >> in
{ r_head = None; r_patt = l; r_class = c; r_branch = b; r_depr = d; }
] ]
;
classifier:
[ [ "=>"; "["; c = Pcaml.expr; "]" -> <:expr< fun () -> $c$>> ] ]
;
args:
[ [ 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 ->
ExtTerminal s
] ]
;
END
;;
|
