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|
(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2012 *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
(*i camlp4deps: "tools/compat5b.cmo" i*)
open Util
open Pp
open Genarg
open Q_util
open Q_coqast
open Argextend
open Pcoq
open Egramml
open Compat
let rec make_patt = function
| [] -> <:patt< [] >>
| GramNonTerminal(loc',_,_,Some p)::l ->
let p = Names.Id.to_string p in
<:patt< [ $lid:p$ :: $make_patt l$ ] >>
| _::l -> make_patt l
let rec make_when loc = function
| [] -> <:expr< True >>
| GramNonTerminal(loc',t,_,Some p)::l ->
let loc' = of_coqloc loc' in
let p = Names.Id.to_string p in
let l = make_when loc l in
let loc = CompatLoc.merge loc' loc in
let t = mlexpr_of_argtype loc' t in
<:expr< Genarg.argument_type_eq (Genarg.genarg_tag $lid:p$) $t$ && $l$ >>
| _::l -> make_when loc l
let rec make_let raw e = function
| [] -> <:expr< fun $lid:"ist"$ -> $e$ >>
| 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 raw e l in
let v =
if raw then <:expr< Genarg.out_gen $make_rawwit loc t$ $lid:p$ >>
else <:expr< Genarg.out_gen $make_topwit loc t$ $lid:p$ >> in
<:expr< let $lid:p$ = $v$ in $e$ >>
| _::l -> make_let raw e l
let rec extract_signature = function
| [] -> []
| GramNonTerminal (_,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.msg_warning
(strbrk ("Two distinct rules of tactic entry "^s^" have the same "^
"non-terminals in the same order: put them in distinct tactic entries"))
let make_clause (pt,_,e) =
(make_patt pt,
vala (Some (make_when (MLast.loc_of_expr e) pt)),
make_let false e pt)
let make_fun_clauses loc s l =
check_unicity s l;
Compat.make_fun loc (List.map make_clause l)
let rec make_args = function
| [] -> <:expr< [] >>
| GramNonTerminal(loc,t,_,Some p)::l ->
let loc = of_coqloc loc in
let p = Names.Id.to_string p in
<:expr< [ Genarg.in_gen $make_topwit loc t$ $lid:p$ :: $make_args l$ ] >>
| _::l -> make_args l
let mlexpr_terminals_of_grammar_tactic_prod_item_expr = function
| GramTerminal s -> <:expr< Some $mlexpr_of_string s$ >>
| GramNonTerminal (loc,nt,_,sopt) ->
let loc = of_coqloc loc in <:expr< None >>
let make_prod_item = function
| GramTerminal s -> <:expr< Egramml.GramTerminal $str:s$ >>
| GramNonTerminal (loc,nt,g,sopt) ->
let loc = of_coqloc loc in
<:expr< Egramml.GramNonTerminal $default_loc$ $mlexpr_of_argtype loc nt$
$mlexpr_of_prod_entry_key g$ $mlexpr_of_option mlexpr_of_ident sopt$ >>
let mlexpr_of_clause =
mlexpr_of_list (fun (a,_,b) -> mlexpr_of_list make_prod_item a)
let rec make_tags loc = function
| [] -> <:expr< [] >>
| GramNonTerminal(loc',t,_,Some p)::l ->
let loc' = of_coqloc loc' in
let l = make_tags loc l in
let loc = CompatLoc.merge 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_tactic_prod_item_expr pt in
<:expr< ($se$, { Pptactic.pptac_args = $make_tags loc pt$;
pptac_prods = ($level$, $prods$) }) >>
let make_printing_rule se = mlexpr_of_list (make_one_printing_rule se)
let make_empty_check = function
| GramNonTerminal(_, t, e, _)->
let is_extra = match t with ExtraArgType _ -> true | _ -> false in
if is_possibly_empty e || is_extra then
(* This possibly parses epsilon *)
let wit = make_wit loc t in
let rawwit = make_rawwit loc t in
<:expr<
match Genarg.default_empty_value $wit$ with
[ None -> raise Exit
| Some v ->
Tacintern.intern_genarg Tacintern.fully_empty_glob_sign
(Genarg.in_gen $rawwit$ v) ] >>
else
(* This does not parse epsilon (this Exit is static time) *)
raise Exit
| GramTerminal _ ->
(* Idem *)
raise Exit
let rec possibly_empty_subentries loc = function
| [] -> []
| (s,prodsl) :: l ->
let rec aux = function
| [] -> (false,<:expr< None >>)
| prods :: rest ->
try
let l = List.map make_empty_check prods in
if has_extraarg prods then
(true,<:expr< try Some $mlexpr_of_list (fun x -> x) l$
with [ Exit -> $snd (aux rest)$ ] >>)
else
(true, <:expr< Some $mlexpr_of_list (fun x -> x) l$ >>)
with Exit -> aux rest in
let (nonempty,v) = aux prodsl in
if nonempty then (s,v) :: possibly_empty_subentries loc l
else possibly_empty_subentries loc l
let possibly_atomic loc prods =
let l = List.map_filter (function
| GramTerminal s :: l, _, _ -> Some (s,l)
| _ -> None) prods
in
possibly_empty_subentries loc (List.factorize_left String.equal l)
let declare_tactic loc s c cl =
let se = mlexpr_of_string s in
let pp = make_printing_rule se cl in
let gl = mlexpr_of_clause cl in
let atomic_tactics =
mlexpr_of_list (mlexpr_of_pair mlexpr_of_string (fun x -> x))
(possibly_atomic loc cl) in
declare_str_items loc
[ <:str_item< do {
try do {
Tacenv.register_ml_tactic $se$ $make_fun_clauses loc s cl$;
List.iter
(fun (s,l) -> match l with
[ Some l ->
Tacenv.register_atomic_ltac (Names.Id.of_string s)
(Tacexpr.TacAtom($default_loc$,
Tacexpr.TacExtend($default_loc$,$se$,l)))
| None -> () ])
$atomic_tactics$ }
with [ e when Errors.noncritical e ->
Pp.msg_warning
(Pp.app
(Pp.str ("Exception in tactic extend " ^ $se$ ^": "))
(Errors.print e)) ];
Egramml.extend_tactic_grammar $se$ $gl$;
List.iter (fun (s, r) -> Pptactic.declare_ml_tactic_pprule s r) $pp$; } >>
]
open Pcaml
open PcamlSig
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
| GramNonTerminal _ :: _ ->
(* En attendant la syntaxe de tacticielles *)
failwith "Tactic syntax must start with an identifier"
| _ -> (l,c,e))
] ]
;
tacargs:
[ [ 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 ->
if String.is_empty s then Errors.user_err_loc (!@loc,"",Pp.str "Empty terminal.");
GramTerminal s
] ]
;
tac_name:
[ [ s = LIDENT -> s
| s = UIDENT -> s
] ]
;
END
|
