(* Title: Pure/Thy/thy_load.ML
Author: Makarius
Loading files that contribute to a theory. Global master path.
*)
signature THY_LOAD =
sig
val master_directory: theory -> Path.T
val imports_of: theory -> string list
val provide: Path.T * (Path.T * SHA1.digest) -> theory -> theory
val check_file: Path.T -> Path.T -> Path.T
val check_thy: Path.T -> string ->
{master: Path.T * SHA1.digest, text: string, imports: string list, uses: (Path.T * bool) list}
val loaded_files: theory -> Path.T list
val all_current: theory -> bool
val provide_file: Path.T -> theory -> theory
val use_ml: Path.T -> unit
val exec_ml: Path.T -> generic_theory -> generic_theory
val begin_theory: Path.T -> string -> string list -> theory list -> (Path.T * bool) list -> theory
val set_master_path: Path.T -> unit
val get_master_path: unit -> Path.T
end;
structure Thy_Load: THY_LOAD =
struct
(* manage source files *)
type files =
{master_dir: Path.T, (*master directory of theory source*)
imports: string list, (*source specification of imports*)
required: Path.T list, (*source path*)
provided: (Path.T * (Path.T * SHA1.digest)) list}; (*source path, physical path, digest*)
fun make_files (master_dir, imports, required, provided): files =
{master_dir = master_dir, imports = imports, required = required, provided = provided};
structure Files = Theory_Data
(
type T = files;
val empty = make_files (Path.current, [], [], []);
fun extend _ = empty;
fun merge _ = empty;
);
fun map_files f =
Files.map (fn {master_dir, imports, required, provided} =>
make_files (f (master_dir, imports, required, provided)));
val master_directory = #master_dir o Files.get;
val imports_of = #imports o Files.get;
fun put_deps dir imports = map_files (fn _ => (dir, imports, [], []));
fun require src_path =
map_files (fn (master_dir, imports, required, provided) =>
if member (op =) required src_path then
error ("Duplicate source file dependency: " ^ Path.print src_path)
else (master_dir, imports, src_path :: required, provided));
fun provide (src_path, path_id) =
map_files (fn (master_dir, imports, required, provided) =>
if AList.defined (op =) provided src_path then
error ("Duplicate resolution of source file dependency: " ^ Path.print src_path)
else (master_dir, imports, required, (src_path, path_id) :: provided));
(* check files *)
fun check_file dir file = File.check_file (File.full_path dir file);
fun digest_file dir file =
let
val full_path = check_file dir file;
val id = SHA1.digest (File.read full_path);
in (full_path, id) end;
fun check_thy dir name =
let
val master_file = check_file dir (Thy_Header.thy_path name);
val text = File.read master_file;
val (name', imports, uses) =
if name = Context.PureN then (Context.PureN, [], [])
else Thy_Header.read (Path.position master_file) text;
val _ = Thy_Header.consistent_name name name';
in {master = (master_file, SHA1.digest text), text = text, imports = imports, uses = uses} end;
(* loaded files *)
val loaded_files = map (#1 o #2) o #provided o Files.get;
fun check_loaded thy =
let
val {required, provided, ...} = Files.get thy;
val provided_paths = map #1 provided;
val _ =
(case subtract (op =) provided_paths required of
[] => NONE
| bad => error ("Pending source file dependencies: " ^ commas (map Path.print (rev bad))));
val _ =
(case subtract (op =) required provided_paths of
[] => NONE
| bad => error ("Undeclared source file dependencies: " ^ commas (map Path.print (rev bad))));
in () end;
fun all_current thy =
let
val {master_dir, provided, ...} = Files.get thy;
fun current (src_path, (_, id)) =
(case try (digest_file master_dir) src_path of
NONE => false
| SOME (_, id') => id = id');
in can check_loaded thy andalso forall current provided end;
val _ = Context.>> (Context.map_theory (Theory.at_end (fn thy => (check_loaded thy; NONE))));
(* provide files *)
fun provide_file src_path thy =
provide (src_path, digest_file (master_directory thy) src_path) thy;
fun use_ml src_path =
if is_none (Context.thread_data ()) then
ML_Context.eval_file (check_file Path.current src_path)
else
let
val thy = ML_Context.the_global_context ();
val (path, id) = digest_file (master_directory thy) src_path;
val _ = ML_Context.eval_file path;
val _ = Context.>> Local_Theory.propagate_ml_env;
val provide = provide (src_path, (path, id));
val _ = Context.>> (Context.mapping provide (Local_Theory.background_theory provide));
in () end;
fun exec_ml src_path = ML_Context.exec (fn () => use_ml src_path);
(* begin theory *)
fun begin_theory dir name imports parents uses =
Theory.begin_theory name parents
|> put_deps dir imports
|> fold (require o fst) uses
|> fold (fn (path, true) => Context.theory_map (exec_ml path) o Theory.checkpoint | _ => I) uses
|> Theory.checkpoint;
(* global master path *)
local
val master_path = Unsynchronized.ref Path.current;
in
fun set_master_path path = master_path := path;
fun get_master_path () = ! master_path;
end;
end;