Theory loader primitives.
(* Title: Pure/Thy/thy_load.ML
ID: $Id$
Author: Markus Wenzel, TU Muenchen
Theory loader primitives.
*)
signature BASIC_THY_LOAD =
sig
val show_path: unit -> string list
val add_path: string -> unit
val del_path: string -> unit
end;
signature THY_LOAD =
sig
include BASIC_THY_LOAD
val thy_ext: string
val find_file: Path.T -> (Path.T * File.info) option
val check_file: Path.T -> File.info option
val load_file: Path.T -> File.info
val check_thy: string -> File.info
val deps_thy: string -> File.info * (string list * Path.T list)
val load_thy: string -> File.info * theory
end;
signature PRIVATE_THY_LOAD =
sig
include THY_LOAD
val deps_thy_fn: (Path.T -> string list * Path.T list) ref
val load_thy_fn: (Path.T -> theory) ref
end;
structure ThyLoad: PRIVATE_THY_LOAD =
struct
(* load path *)
val load_path = ref [Path.current];
fun change_path f = load_path := f (! load_path);
fun show_path () = map Path.pack (! load_path);
fun add_path s = change_path (fn path => path @ [Path.unpack s]);
fun del_path s = change_path (filter_out (equal (Path.unpack s)));
(* find / check file *)
fun find_file file_src =
let
val file = Path.expand file_src;
fun find dir =
let val full_path = Path.append dir file
in apsome (pair full_path) (File.info full_path) end;
in get_first find (if Path.is_basic file then ! load_path else [Path.current]) end;
(* process ML files *)
val check_file = apsome #2 o find_file;
fun load_file raw_path =
(case find_file raw_path of
Some (path, info) => (Use.use_path path; info)
| None => error ("Could not find ML file " ^ quote (Path.pack raw_path)));
(* process theory files *)
val thy_ext = "thy";
fun process_thy f name =
let val path = Path.ext thy_ext (Path.basic name) in
(case find_file path of
Some (path, info) => (info, f path)
| None => error ("Could not find theory file " ^ quote (Path.pack path)))
end;
(*hooks for theory syntax dependent operations*)
fun undefined _ = raise Match;
val deps_thy_fn = ref (undefined: Path.T -> string list * Path.T list);
val load_thy_fn = ref (undefined: Path.T -> theory);
val check_thy = #1 o process_thy (K ());
val deps_thy = process_thy (fn path => ! deps_thy_fn path);
val load_thy = process_thy (fn path => ! load_thy_fn path);
end;
structure BasicThyLoad: BASIC_THY_LOAD = ThyLoad;
open BasicThyLoad;