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|
(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * CNRS-Ecole Polytechnique-INRIA Futurs-Universite Paris Sud *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
(*i $Id: scheme.ml 10233 2007-10-17 23:29:08Z letouzey $ i*)
(*s Production of Scheme syntax. *)
open Pp
open Util
open Names
open Nameops
open Libnames
open Miniml
open Mlutil
open Table
open Common
(*s Scheme renaming issues. *)
let keywords =
List.fold_right (fun s -> Idset.add (id_of_string s))
[ "define"; "let"; "lambda"; "lambdas"; "match";
"apply"; "car"; "cdr";
"error"; "delay"; "force"; "_"; "__"]
Idset.empty
let preamble _ _ usf =
str ";; This extracted scheme code relies on some additional macros\n" ++
str ";; available at http://www.pps.jussieu.fr/~letouzey/scheme\n" ++
str "(load \"macros_extr.scm\")\n\n" ++
(if usf.mldummy then str "(define __ (lambda (_) __))\n\n" else mt ())
let pr_id id =
let s = string_of_id id in
for i = 0 to String.length s - 1 do
if s.[i] = '\'' then s.[i] <- '~'
done;
str s
let paren = pp_par true
let pp_abst st = function
| [] -> assert false
| [id] -> paren (str "lambda " ++ paren (pr_id id) ++ spc () ++ st)
| l -> paren
(str "lambdas " ++ paren (prlist_with_sep spc pr_id l) ++ spc () ++ st)
let pp_apply st _ = function
| [] -> st
| [a] -> hov 2 (paren (st ++ spc () ++ a))
| args -> hov 2 (paren (str "@ " ++ st ++
(prlist_strict (fun x -> spc () ++ x) args)))
(*s The pretty-printer for Scheme syntax *)
let pp_global k r = str (Common.pp_global k r)
(*s Pretty-printing of expressions. *)
let rec pp_expr env args =
let apply st = pp_apply st true args in
function
| MLrel n ->
let id = get_db_name n env in apply (pr_id id)
| MLapp (f,args') ->
let stl = List.map (pp_expr env []) args' in
pp_expr env (stl @ args) f
| MLlam _ as a ->
let fl,a' = collect_lams a in
let fl,env' = push_vars fl env in
apply (pp_abst (pp_expr env' [] a') (List.rev fl))
| MLletin (id,a1,a2) ->
let i,env' = push_vars [id] env in
apply
(hv 0
(hov 2
(paren
(str "let " ++
paren
(paren
(pr_id (List.hd i) ++ spc () ++ pp_expr env [] a1))
++ spc () ++ hov 0 (pp_expr env' [] a2)))))
| MLglob r ->
apply (pp_global Term r)
| MLcons (i,r,args') ->
assert (args=[]);
let st =
str "`" ++
paren (pp_global Cons r ++
(if args' = [] then mt () else spc ()) ++
prlist_with_sep spc (pp_cons_args env) args')
in
if i = Coinductive then paren (str "delay " ++ st) else st
| MLcase ((i,_),t, pv) ->
let e =
if i <> Coinductive then pp_expr env [] t
else paren (str "force" ++ spc () ++ pp_expr env [] t)
in
apply (v 3 (paren (str "match " ++ e ++ fnl () ++ pp_pat env pv)))
| MLfix (i,ids,defs) ->
let ids',env' = push_vars (List.rev (Array.to_list ids)) env in
pp_fix env' i (Array.of_list (List.rev ids'),defs) args
| MLexn s ->
(* An [MLexn] may be applied, but I don't really care. *)
paren (str "error" ++ spc () ++ qs s)
| MLdummy ->
str "__" (* An [MLdummy] may be applied, but I don't really care. *)
| MLmagic a ->
pp_expr env args a
| MLaxiom -> paren (str "error \"AXIOM TO BE REALIZED\"")
and pp_cons_args env = function
| MLcons (i,r,args) when i<>Coinductive ->
paren (pp_global Cons r ++
(if args = [] then mt () else spc ()) ++
prlist_with_sep spc (pp_cons_args env) args)
| e -> str "," ++ pp_expr env [] e
and pp_one_pat env (r,ids,t) =
let ids,env' = push_vars (List.rev ids) env in
let args =
if ids = [] then mt ()
else (str " " ++ prlist_with_sep spc pr_id (List.rev ids))
in
(pp_global Cons r ++ args), (pp_expr env' [] t)
and pp_pat env pv =
prvect_with_sep fnl
(fun x -> let s1,s2 = pp_one_pat env x in
hov 2 (str "((" ++ s1 ++ str ")" ++ spc () ++ s2 ++ str ")")) pv
(*s names of the functions ([ids]) are already pushed in [env],
and passed here just for convenience. *)
and pp_fix env j (ids,bl) args =
paren
(str "letrec " ++
(v 0 (paren
(prvect_with_sep fnl
(fun (fi,ti) ->
paren ((pr_id fi) ++ spc () ++ (pp_expr env [] ti)))
(array_map2 (fun id b -> (id,b)) ids bl)) ++
fnl () ++
hov 2 (pp_apply (pr_id (ids.(j))) true args))))
(*s Pretty-printing of a declaration. *)
let pp_decl = function
| Dind _ -> mt ()
| Dtype _ -> mt ()
| Dfix (rv, defs,_) ->
let ppv = Array.map (pp_global Term) rv in
prvect_with_sep fnl
(fun (pi,ti) ->
hov 2
(paren (str "define " ++ pi ++ spc () ++
(pp_expr (empty_env ()) [] ti))
++ fnl ()))
(array_map2 (fun p b -> (p,b)) ppv defs) ++
fnl ()
| Dterm (r, a, _) ->
if is_inline_custom r then mt ()
else
if is_custom r then
hov 2 (paren (str "define " ++ pp_global Term r ++ spc () ++
str (find_custom r))) ++ fnl () ++ fnl ()
else
hov 2 (paren (str "define " ++ pp_global Term r ++ spc () ++
pp_expr (empty_env ()) [] a)) ++ fnl () ++ fnl ()
let pp_structure_elem = function
| (l,SEdecl d) -> pp_decl d
| (l,SEmodule m) ->
failwith "TODO: Scheme extraction of modules not implemented yet"
| (l,SEmodtype m) ->
failwith "TODO: Scheme extraction of modules not implemented yet"
let pp_struct =
let pp_sel (mp,sel) =
push_visible mp;
let p = prlist_strict pp_structure_elem sel in
pop_visible (); p
in
prlist_strict pp_sel
let scheme_descr = {
keywords = keywords;
file_suffix = ".scm";
capital_file = false;
preamble = preamble;
pp_struct = pp_struct;
sig_suffix = None;
sig_preamble = (fun _ _ _ -> mt ());
pp_sig = (fun _ -> mt ());
pp_decl = pp_decl;
}
|
