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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 *)
(************************************************************************)
(* $Id$ *)
(* This module defines validation functions to ensure an imported
value (using input_value) has the correct structure. *)
let rec pr_obj_rec o =
if Obj.is_int o then
Format.print_int(Obj.magic o)
else if Obj.is_block o then
let t = Obj.tag o in
if t > Obj.no_scan_tag then
if t = Obj.string_tag then
Format.print_string ("\""^String.escaped(Obj.magic o)^"\"")
else
Format.print_string "?"
else
(let n = Obj.size o in
Format.print_string ("#"^string_of_int t^"(");
Format.open_hvbox 0;
for i = 0 to n-1 do
pr_obj_rec (Obj.field o i);
if i<>n-1 then (Format.print_string ","; Format.print_cut())
done;
Format.close_box();
Format.print_string ")")
else Format.print_string "?"
let pr_obj o = pr_obj_rec o; Format.print_newline()
(**************************************************************************)
(* Obj low-level validators *)
exception ValidObjError of string * Obj.t
let fail o s = raise (ValidObjError(s,o))
let ep s1 f s2 = f (s1^"/"^s2)
let apply debug f x =
let o = Obj.repr x in
try f o
with ValidObjError(msg,obj) ->
if debug then begin
print_endline ("Validation failed: "^msg);
pr_obj obj
end;
failwith "vo structure validation failed"
(* data not validated *)
let no_val (o:Obj.t) = ()
(* Check that object o is a block with tag t *)
let val_tag t o =
if Obj.is_block o && Obj.tag o = t then ()
else fail o ("expected tag "^string_of_int t)
let val_block s o =
if Obj.is_block o then
(if Obj.tag o > Obj.no_scan_tag then
fail o (s^": found no scan tag"))
else fail o (s^": expected block obj")
(* Check that an object is a tuple (or a record). v is an array of
validation functions for each field. Its size corresponds to the
expected size of the object. *)
let val_tuple s v o =
let n = Array.length v in
val_block ("tuple: "^s) o;
if Obj.size o = n then Array.iteri (fun i f -> f (Obj.field o i)) v
else
fail o ("tuple:" ^s^" size found:"^string_of_int (Obj.size o))
(* Check that the object is either a constant constructor of tag < cc,
or a constructed variant. each element of vv is an array of
validation functions to be applied to the constructor arguments.
The size of vv corresponds to the number of non-constant
constructors, and the size of vv.(i) is the expected arity of the
i-th non-constant constructor. *)
let val_sum s cc vv o =
if Obj.is_block o then
(val_block s o;
let n = Array.length vv in
let i = Obj.tag o in
if i < n then val_tuple (s^"(tag "^string_of_int i^")") vv.(i) o
else fail o ("bad tag in (sum type) "^s^": found "^string_of_int i))
else if Obj.is_int o then
let (n:int) = Obj.magic o in
(if n<0 || n>=cc then
fail o (s^": bad constant constructor "^string_of_int n))
else fail o ("not a sum ("^s^")")
let val_enum s n = val_sum s n [||]
(* Recursive types: avoid looping by eta-expansion *)
let rec val_rec_sum s cc f o =
val_sum s cc (f (val_rec_sum s cc f)) o
let rec val_rectype f o =
f (val_rectype f) o
(**************************************************************************)
(* Builtin types *)
(* Check the o is an array of values satisfying f. *)
let val_array ?(name="array") f o =
val_block name o;
for i = 0 to Obj.size o - 1 do
(f (Obj.field o i):unit)
done
(* Integer validator *)
let val_int o =
if not (Obj.is_int o) then fail o "expected an int"
(* String validator *)
let val_str o =
try val_tag Obj.string_tag o
with Failure _ -> fail o "expected a string"
(* Booleans *)
let val_bool = val_enum "bool" 2
(* Option type *)
let val_opt ?(name="option") f = val_sum name 1 [|[|f|]|]
(* Lists *)
let val_list ?(name="list") f =
val_rec_sum name 1 (fun vlist -> [|[|f;vlist|]|])
(* Reference *)
let val_ref ?(name="ref") f = val_tuple name [|f|]
(**************************************************************************)
(* Standard library types *)
(* Sets *)
let val_set ?(name="Set.t") f =
val_rec_sum name 1 (fun vset -> [|[|vset;f;vset;val_int|]|])
(* Maps *)
let rec val_map ?(name="Map.t") fk fv =
val_rec_sum name 1 (fun vmap -> [|[|vmap;fk;fv;vmap;val_int|]|])
(**************************************************************************)
(* Coq types *)
(* names *)
let val_id = val_str
let val_dp = val_list ~name:"dirpath" val_id
let val_name = val_sum "name" 1 [|[|val_id|]|]
let val_uid = val_tuple "uniq_ident" [|val_int;val_str;val_dp|]
let val_mp =
val_rec_sum "module_path" 0
(fun vmp -> [|[|val_dp|];[|val_uid|];[|vmp;val_id|]|])
let val_kn = val_tuple "kernel_name" [|val_mp;val_dp;val_id|]
let val_con =
val_tuple "constant/mutind" [|val_kn;val_kn|]
let val_ind = val_tuple "inductive"[|val_con;val_int|]
let val_cstr = val_tuple "constructor"[|val_ind;val_int|]
(* univ *)
let val_level = val_sum "level" 1 [|[|val_dp;val_int|]|]
let val_univ = val_sum "univ" 0
[|[|val_level|];[|val_list val_level;val_list val_level|]|]
let val_cstrs =
val_set ~name:"Univ.constraints"
(val_tuple "univ_constraint"
[|val_level;val_enum "order_request" 3;val_level|])
|
