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(* ocaml-data-notation: Store data using OCaml notation *)
(* *)
(* Copyright (C) 2009-2011, OCamlCore SARL *)
(* Copyright (C) 2013, Sylvain Le Gall *)
(* *)
(* This library is free software; you can redistribute it and/or modify it *)
(* under the terms of the GNU Lesser General Public License as published by *)
(* the Free Software Foundation; either version 2.1 of the License, or (at *)
(* your option) any later version, with the OCaml static compilation *)
(* exception. *)
(* *)
(* This library is distributed in the hope that it will be useful, but *)
(* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *)
(* or FITNESS FOR A PARTICULAR PURPOSE. See the file COPYING for more *)
(* details. *)
(* *)
(* You should have received a copy of the GNU Lesser General Public License *)
(* along with this library; if not, write to the Free Software Foundation, *)
(* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA *)
(******************************************************************************)
(** OCaml data notation.
This module helps to translate OCaml data into a string following
OCaml syntax.
*)
(** {2 Types}
*)
type module_name = string
type field_name = string
type variant_name = string
type var_name = string
type t =
(** Record *)
| REC of module_name * (field_name * t) list
(** List *)
| LST of t list
(** String *)
| STR of string
(** Variant type constructor *)
| VRT of variant_name * t list
(** Boolean *)
| BOO of bool
(** Integer *)
| INT of int
(** Float *)
| FLT of float
(** Tuple *)
| TPL of t list
(** Unit () *)
| UNT
(** Function application *)
| APP of var_name * (var_name * t) list * t list
(** Variable *)
| VAR of var_name
(** Polymorphic variant *)
| PVR of variant_name * t option
(** {2 Basic conversion}
*)
let of_unit () =
UNT
let of_bool b =
BOO b
let of_string s =
STR s
let of_int i =
INT i
let of_float f =
FLT f
let of_option f =
function
| Some v -> VRT("Some", [f v])
| None -> VRT("None", [])
let of_list f lst =
LST (List.map f lst)
let of_tuple2 (f1, f2) (v1, v2) =
TPL [f1 v1; f2 v2]
let of_tuple3 (f1, f2, f3) (v1, v2, v3) =
TPL [f1 v1; f2 v2; f3 v3]
let of_tuple4 (f1, f2, f3, f4) (v1, v2, v3, v4) =
TPL [f1 v1; f2 v2; f3 v3; f4 v4]
let of_tuple5 (f1, f2, f3, f4, f5) (v1, v2, v3, v4, v5) =
TPL [f1 v1; f2 v2; f3 v3; f4 v4; f5 v5]
(** {2 Formating}
*)
open Format
let pp_odn ?(opened_modules=[]) fmt t =
let opened_modules =
(* Use opened modules starting with the bigger *)
List.sort
(fun mod1 mod2 -> String.length mod2 - String.length mod1)
opened_modules
in
let pp_list pp_elem lst_sep fmt =
function
| [] ->
()
| hd :: tl ->
pp_elem fmt hd;
List.iter
(fun e ->
fprintf fmt lst_sep;
pp_elem fmt e)
tl
in
let pp_print_id fmt id =
let chop_opened_module str =
try
let str_len =
String.length str
in
let matching_opened_mod =
List.find
(fun opened_mod ->
let opened_mod_len =
String.length opened_mod
in
if opened_mod_len + 1 <= str_len then
(opened_mod = String.sub str 0 opened_mod_len)
&&
str.[opened_mod_len] = '.'
else
false)
opened_modules
in
let chop_prefix_len =
(String.length matching_opened_mod) + 1
in
String.sub str chop_prefix_len (str_len - chop_prefix_len)
with Not_found ->
str
in
pp_print_string fmt (chop_opened_module id)
in
let rec pp_odn_aux fmt =
function
| REC (mod_nm, flds) ->
begin
let rec print_fields fmt first fields =
let print_field fmt (fld, e) =
fprintf fmt
"@[<hv 2>%a =@ %a@]"
(* We use the first field to add the module name at the
* beginning. *)
pp_print_id (if first then mod_nm^"."^fld else fld)
pp_odn_aux e
in
match fields with
| [fld, e] ->
print_field fmt (fld, e)
| (fld, e) :: tl ->
print_field fmt (fld, e);
fprintf fmt ";@ ";
print_fields fmt false tl
| [] ->
()
in
fprintf fmt "@[{@[<hv 2>@,";
print_fields fmt true flds;
fprintf fmt "@]@,}@]"
end
| LST lst ->
fprintf fmt "@[[@[<hv 2>@,%a@]@,]@]"
(pp_list pp_odn_aux ";@ ") lst
| STR str ->
fprintf fmt "%S" str
| VRT (nm, []) ->
pp_print_id fmt nm
| VRT (nm, lst) ->
fprintf fmt
"@[<hv 2>%a@ %a@]"
pp_print_id nm
pp_odn_aux (TPL lst)
| BOO b ->
pp_print_bool fmt b
| TPL [] ->
pp_print_string fmt "()"
| TPL [(FLT _) as v]
| TPL [(INT _) as v]
| TPL [(STR _) as v]
| TPL [(REC _) as v]
| TPL [(LST _) as v]
| TPL [(BOO _) as v]
| TPL [UNT as v]
| TPL [(VAR _) as v] ->
pp_odn_aux fmt v
| TPL lst ->
fprintf fmt
"@[<hv 2>(%a)@]"
(pp_list pp_odn_aux ",@ ") lst
| UNT ->
pp_print_string fmt "()"
| FLT f ->
pp_print_float fmt f
| INT i ->
pp_print_int fmt i
| APP (fnm, named_args, args) ->
fprintf fmt
"@[<hv 2>%a%a%a@]"
pp_print_id fnm
(pp_list
(fun fmt (nm, e) ->
fprintf fmt "@ ~%s:%a" nm pp_odn_aux e) "")
named_args
(pp_list
(fun fmt e ->
fprintf fmt "@ %a" pp_odn_aux e) "")
args
| VAR nm ->
pp_print_id fmt nm
| PVR (nm, None) ->
pp_print_id fmt ("`"^nm)
| PVR (nm, Some tpl) ->
fprintf fmt
"@[<hv 2>`%a@ %a@]"
pp_print_id nm
pp_odn_aux tpl
in
pp_odn_aux fmt t
let string_of_odn ?opened_modules odn =
let buff =
Buffer.create 13
in
let fmt =
formatter_of_buffer buff
in
pp_odn ?opened_modules fmt odn;
pp_print_flush fmt ();
Buffer.contents buff
|