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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 *)
(************************************************************************)
(* $Id$ *)
open Pp
open Util
open Names
(* Identifiers *)
let pr_id id = str (string_of_id id)
let pr_name = function
| Anonymous -> str "_"
| Name id -> pr_id id
(* Utilities *)
let code_of_0 = Char.code '0'
let code_of_9 = Char.code '9'
let cut_ident skip_quote s =
let s = string_of_id s in
let slen = String.length s in
(* [n'] is the position of the first non nullary digit *)
let rec numpart n n' =
if n = 0 then
(* ident made of _ and digits only [and ' if skip_quote]: don't cut it *)
slen
else
let c = Char.code (String.get s (n-1)) in
if c = code_of_0 && n <> slen then
numpart (n-1) n'
else if code_of_0 <= c && c <= code_of_9 then
numpart (n-1) (n-1)
else if skip_quote & (c = Char.code '\'' || c = Char.code '_') then
numpart (n-1) (n-1)
else
n'
in
numpart slen slen
let repr_ident s =
let numstart = cut_ident false s in
let s = string_of_id s in
let slen = String.length s in
if numstart = slen then
(s, None)
else
(String.sub s 0 numstart,
Some (int_of_string (String.sub s numstart (slen - numstart))))
let make_ident sa = function
| Some n ->
let c = Char.code (String.get sa (String.length sa -1)) in
let s =
if c < code_of_0 or c > code_of_9 then sa ^ (string_of_int n)
else sa ^ "_" ^ (string_of_int n) in
id_of_string s
| None -> id_of_string (String.copy sa)
let root_of_id id =
let suffixstart = cut_ident true id in
id_of_string (String.sub (string_of_id id) 0 suffixstart)
(* Rem: semantics is a bit different, if an ident starts with toto00 then
after successive renamings it comes to toto09, then it goes on with toto10 *)
let lift_subscript id =
let id = string_of_id id in
let len = String.length id in
let rec add carrypos =
let c = id.[carrypos] in
if is_digit c then
if c = '9' then begin
assert (carrypos>0);
add (carrypos-1)
end
else begin
let newid = String.copy id in
String.fill newid (carrypos+1) (len-1-carrypos) '0';
newid.[carrypos] <- Char.chr (Char.code c + 1);
newid
end
else begin
let newid = id^"0" in
if carrypos < len-1 then begin
String.fill newid (carrypos+1) (len-1-carrypos) '0';
newid.[carrypos+1] <- '1'
end;
newid
end
in id_of_string (add (len-1))
let has_subscript id =
let id = string_of_id id in
is_digit (id.[String.length id - 1])
let forget_subscript id =
let numstart = cut_ident false id in
let newid = String.make (numstart+1) '0' in
String.blit (string_of_id id) 0 newid 0 numstart;
(id_of_string newid)
let add_suffix id s = id_of_string (string_of_id id ^ s)
let add_prefix s id = id_of_string (s ^ string_of_id id)
let atompart_of_id id = fst (repr_ident id)
(* Fresh names *)
let lift_ident = lift_subscript
let next_ident_away id avoid =
if List.mem id avoid then
let id0 = if not (has_subscript id) then id else
(* Ce serait sans doute mieux avec quelque chose inspiré de
*** make_ident id (Some 0) *** mais ça brise la compatibilité... *)
forget_subscript id in
let rec name_rec id =
if List.mem id avoid then name_rec (lift_ident id) else id in
name_rec id0
else id
let next_ident_away_from id avoid =
let rec name_rec id =
if List.mem id avoid then name_rec (lift_ident id) else id in
name_rec id
(* Names *)
let out_name = function
| Name id -> id
| Anonymous -> failwith "out_name: expects a defined name"
let name_fold f na a =
match na with
| Name id -> f id a
| Anonymous -> a
let name_cons na l =
match na with
| Anonymous -> l
| Name id -> id::l
let name_app f = function
| Name id -> Name (f id)
| Anonymous -> Anonymous
let name_fold_map f e = function
| Name id -> let (e,id) = f e id in (e,Name id)
| Anonymous -> e,Anonymous
let next_name_away_with_default default name l =
match name with
| Name str -> next_ident_away str l
| Anonymous -> next_ident_away (id_of_string default) l
let next_name_away = next_name_away_with_default "H"
let pr_lab l = str (string_of_label l)
let default_library = Names.initial_dir (* = ["Top"] *)
(*s Roots of the space of absolute names *)
let coq_root = id_of_string "Coq"
let default_root_prefix = make_dirpath []
(* Metavariables *)
let pr_meta = Pp.int
let string_of_meta = string_of_int
|
