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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 VERNAC EXTEND macro. *)
open Pp
open Util
open Q_util
open Argextend
open Tacextend
open Pcoq
open Egramml
open Compat
type rule = {
r_head : string option;
(** The first terminal grammar token *)
r_patt : grammar_prod_item 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
| GramNonTerminal(loc,t,_,Some p)::l ->
let loc = of_coqloc loc in
let p = Names.Id.to_string p in
let loc = CompatLoc.merge 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 (Some (make_when (MLast.loc_of_expr e) pt)),
make_let e pt)
(* To avoid warnings *)
let mk_ignore c pt =
let names = CList.map_filter (function
| GramNonTerminal(_,_,_,Some p) -> Some (Names.Id.to_string p)
| _ -> None) 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 (Some (make_when (MLast.loc_of_expr c) pt)),
make_let (mk_ignore c pt) pt)
| None, Some cg ->
(make_patt pt,
vala (Some (make_when (MLast.loc_of_expr cg) pt)),
<:expr< fun () -> $cg$ $str:s$ >>)
| None, None -> msg_warning
(strbrk("Vernac entry \""^s^"\" misses a classifier. "^
"A classifier is a function that returns an expression "^
"of type vernac_classification (see Vernacexpr). You can: ")++
str"- "++hov 0 (
strbrk("Use '... EXTEND "^s^" CLASSIFIED AS QUERY ...' if the "^
"new vernacular command does not alter the system state;"))++fnl()++
str"- "++hov 0 (
strbrk("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;"))++fnl()++
str"- "++hov 0 (
strbrk("Use '... EXTEND "^s^" CLASSIFIED BY f ...' to specify "^
"a global function f. The function f will be called passing "^
"\""^s^"\" as the only argument;")) ++fnl()++
str"- "++hov 0 (
strbrk"Add a specific classifier in each clause using the syntax:"
++fnl()++strbrk("'[...] => [ f ] -> [...]'. "))++fnl()++
strbrk("Specific classifiers have precedence over global "^
"classifiers. Only one classifier is called.")++fnl());
(make_patt pt,
vala (Some (make_when loc pt)),
<: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 = Compat.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 -> Compat.make_fun loc [make_clause_classifier c s x]) l in
mlexpr_of_list (fun x -> x) cl
let mlexpr_of_clause =
mlexpr_of_list
(fun { r_head = a; r_patt = b; } -> mlexpr_of_list make_prod_item
(Option.List.cons (Option.map (fun a -> GramTerminal a) a) b))
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 {
try 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) $classl$ }
with [ e when Errors.noncritical e ->
Pp.msg_warning
(Pp.app
(Pp.str ("Exception in vernac extend " ^ $se$ ^": "))
(Errors.print e)) ];
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; "]" ->
if String.is_empty s then
Errors.user_err_loc (!@loc,"",Pp.str"Command name is empty.");
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 t, g = interp_entry_name false None e "" in
GramNonTerminal (!@loc, t, g, Some (Names.Id.of_string s))
| e = LIDENT; "("; s = LIDENT; ","; sep = STRING; ")" ->
let t, g = interp_entry_name false None e sep in
GramNonTerminal (!@loc, t, g, Some (Names.Id.of_string s))
| s = STRING ->
GramTerminal s
] ]
;
END
;;
|
