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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 *)
(************************************************************************)
open Xml_datatype
exception Marshal_error
(** Utility functions *)
let rec get_attr attr = function
| [] -> raise Not_found
| (k, v) :: l when CString.equal k attr -> v
| _ :: l -> get_attr attr l
let massoc x l =
try get_attr x l
with Not_found -> raise Marshal_error
let constructor t c args = Element (t, ["val", c], args)
let do_match t mf = function
| Element (s, attrs, args) when CString.equal s t ->
let c = massoc "val" attrs in
mf c args
| _ -> raise Marshal_error
let singleton = function
| [x] -> x
| _ -> raise Marshal_error
let raw_string = function
| [] -> ""
| [PCData s] -> s
| _ -> raise Marshal_error
(** Base types *)
let of_unit () = Element ("unit", [], [])
let to_unit : xml -> unit = function
| Element ("unit", [], []) -> ()
| _ -> raise Marshal_error
let of_bool (b : bool) : xml =
if b then constructor "bool" "true" []
else constructor "bool" "false" []
let to_bool : xml -> bool = do_match "bool" (fun s _ -> match s with
| "true" -> true
| "false" -> false
| _ -> raise Marshal_error)
let of_list (f : 'a -> xml) (l : 'a list) =
Element ("list", [], List.map f l)
let to_list (f : xml -> 'a) : xml -> 'a list = function
| Element ("list", [], l) -> List.map f l
| _ -> raise Marshal_error
let of_option (f : 'a -> xml) : 'a option -> xml = function
| None -> Element ("option", ["val", "none"], [])
| Some x -> Element ("option", ["val", "some"], [f x])
let to_option (f : xml -> 'a) : xml -> 'a option = function
| Element ("option", ["val", "none"], []) -> None
| Element ("option", ["val", "some"], [x]) -> Some (f x)
| _ -> raise Marshal_error
let of_string (s : string) : xml = Element ("string", [], [PCData s])
let to_string : xml -> string = function
| Element ("string", [], l) -> raw_string l
| _ -> raise Marshal_error
let of_int (i : int) : xml = Element ("int", [], [PCData (string_of_int i)])
let to_int : xml -> int = function
| Element ("int", [], [PCData s]) ->
(try int_of_string s with Failure _ -> raise Marshal_error)
| _ -> raise Marshal_error
let of_pair (f : 'a -> xml) (g : 'b -> xml) (x : 'a * 'b) : xml =
Element ("pair", [], [f (fst x); g (snd x)])
let to_pair (f : xml -> 'a) (g : xml -> 'b) : xml -> 'a * 'b = function
| Element ("pair", [], [x; y]) -> (f x, g y)
| _ -> raise Marshal_error
let of_union (f : 'a -> xml) (g : 'b -> xml) : ('a,'b) CSig.union -> xml = function
| CSig.Inl x -> Element ("union", ["val","in_l"], [f x])
| CSig.Inr x -> Element ("union", ["val","in_r"], [g x])
let to_union (f : xml -> 'a) (g : xml -> 'b) : xml -> ('a,'b) CSig.union = function
| Element ("union", ["val","in_l"], [x]) -> CSig.Inl (f x)
| Element ("union", ["val","in_r"], [x]) -> CSig.Inr (g x)
| _ -> raise Marshal_error
(** More elaborate types *)
let of_edit_id i = Element ("edit_id",["val",string_of_int i],[])
let to_edit_id = function
| Element ("edit_id",["val",i],[]) ->
let id = int_of_string i in
assert (id <= 0 );
id
| _ -> raise Marshal_error
let of_loc loc =
let start, stop = Loc.unloc loc in
Element ("loc",[("start",string_of_int start);("stop",string_of_int stop)],[])
let to_loc xml =
match xml with
| Element ("loc", l,[]) ->
(try
let start = massoc "start" l in
let stop = massoc "stop" l in
Loc.make_loc (int_of_string start, int_of_string stop)
with Not_found | Invalid_argument _ -> raise Marshal_error)
| _ -> raise Marshal_error
|
