src/Pure/Thy/thy_load.ML
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simplified/clarified Thy_Load path: search for master only, lookup other files relative to that; tuned;
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(*  Title:      Pure/Thy/thy_load.ML
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    Author:     Markus Wenzel, TU Muenchen
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Loading files that contribute to a theory, including global load path
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management.
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*)
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signature BASIC_THY_LOAD =
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sig
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  val show_path: unit -> string list
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  val add_path: string -> unit
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  val path_add: string -> unit
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  val del_path: string -> unit
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  val reset_path: unit -> unit
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end;
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signature THY_LOAD =
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sig
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  include BASIC_THY_LOAD
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  val set_master_path: Path.T -> unit
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  val get_master_path: unit -> Path.T
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  val master_directory: theory -> Path.T
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  val require: Path.T -> theory -> theory
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  val provide: Path.T * (Path.T * File.ident) -> theory -> theory
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  val check_file: Path.T list -> Path.T -> Path.T * File.ident
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  val check_thy: Path.T -> string -> Path.T * File.ident
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  val deps_thy: Path.T -> string ->
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   {master: Path.T * File.ident, text: string, imports: string list, uses: Path.T list}
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  val loaded_files: theory -> Path.T list
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  val all_current: theory -> bool
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  val provide_file: Path.T -> theory -> theory
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  val use_ml: Path.T -> unit
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  val exec_ml: Path.T -> generic_theory -> generic_theory
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  val begin_theory: Path.T -> string -> theory list -> (Path.T * bool) list -> theory
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end;
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structure Thy_Load: THY_LOAD =
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struct
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(* manage source files *)
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type files =
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 {master_dir: Path.T,                                 (*master directory of theory source*)
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  required: Path.T list,                              (*source path*)
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  provided: (Path.T * (Path.T * File.ident)) list};   (*source path, physical path, identifier*)
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fun make_files (master_dir, required, provided): files =
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 {master_dir = master_dir, required = required, provided = provided};
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structure Files = Theory_Data
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(
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  type T = files;
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  val empty = make_files (Path.current, [], []);
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  fun extend _ = empty;
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  fun merge _ = empty;
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);
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fun map_files f =
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  Files.map (fn {master_dir, required, provided} =>
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    make_files (f (master_dir, required, provided)));
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val master_directory = #master_dir o Files.get;
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fun master dir = map_files (fn _ => (dir, [], []));
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fun require src_path =
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  map_files (fn (master_dir, required, provided) =>
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    if member (op =) required src_path then
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      error ("Duplicate source file dependency: " ^ Path.implode src_path)
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    else (master_dir, src_path :: required, provided));
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fun provide (src_path, path_id) =
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  map_files (fn (master_dir, required, provided) =>
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    if AList.defined (op =) provided src_path then
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      error ("Duplicate resolution of source file dependency: " ^ Path.implode src_path)
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    else (master_dir, required, (src_path, path_id) :: provided));
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(* maintain default paths *)
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local
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  val load_path = Unsynchronized.ref [Path.current];
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  val master_path = Unsynchronized.ref Path.current;
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in
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fun show_path () = map Path.implode (! load_path);
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fun del_path s =
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  CRITICAL (fn () => Unsynchronized.change load_path (remove (op =) (Path.explode s)));
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fun add_path s =
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  CRITICAL (fn () => (del_path s; Unsynchronized.change load_path (cons (Path.explode s))));
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fun path_add s =
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  CRITICAL (fn () =>
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    (del_path s; Unsynchronized.change load_path (fn path => path @ [Path.explode s])));
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fun reset_path () = CRITICAL (fn () => load_path := [Path.current]);
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fun search_path dir path =
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  distinct (op =) (dir :: (if Path.is_basic path then (! load_path) else [Path.current]));
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fun set_master_path path = master_path := path;
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fun get_master_path () = ! master_path;
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end;
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(* check files *)
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fun get_file dirs src_path =
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  let
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    val path = Path.expand src_path;
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    val _ = Path.is_current path andalso error "Bad file specification";
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  in
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    dirs |> get_first (fn dir =>
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      let val full_path = File.full_path (Path.append dir path) in
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        (case File.ident full_path of
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          NONE => NONE
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        | SOME id => SOME (full_path, id))
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      end)
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  end;
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fun check_file dirs file =
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  (case get_file dirs file of
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    SOME path_id => path_id
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  | NONE => error ("Could not find file " ^ quote (Path.implode file) ^
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      "\nin " ^ commas_quote (map Path.implode dirs)));
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fun check_thy master_dir name =
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  let
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    val thy_file = Thy_Header.thy_path name;
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    val dirs = search_path master_dir thy_file;
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  in check_file dirs thy_file end;
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(* theory deps *)
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fun deps_thy master_dir name =
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  let
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    val master as (thy_path, _) = check_thy master_dir name;
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    val text = File.read thy_path;
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    val (name', imports, uses) = Thy_Header.read (Path.position thy_path) text;
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    val _ = Thy_Header.consistent_name name name';
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    val uses = map (Path.explode o #1) uses;
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  in {master = master, text = text, imports = imports, uses = uses} end;
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(* loaded files *)
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val loaded_files = map (#1 o #2) o #provided o Files.get;
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fun check_loaded thy =
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  let
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    val {required, provided, ...} = Files.get thy;
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    val provided_paths = map #1 provided;
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    val _ =
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      (case subtract (op =) provided_paths required of
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        [] => NONE
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      | bad => error ("Pending source file dependencies: " ^ commas (map Path.implode (rev bad))));
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    val _ =
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      (case subtract (op =) required provided_paths of
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        [] => NONE
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      | bad => error ("Undeclared source file dependencies: " ^ commas (map Path.implode (rev bad))));
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  in () end;
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fun all_current thy =
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  let
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    val {master_dir, provided, ...} = Files.get thy;
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    fun current (src_path, (_, id)) =
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      (case get_file [master_dir] src_path of
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        NONE => false
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      | SOME (_, id') => id = id');
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  in can check_loaded thy andalso forall current provided end;
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val _ = Context.>> (Context.map_theory (Theory.at_end (fn thy => (check_loaded thy; NONE))));
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(* provide files *)
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fun provide_file src_path thy =
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  provide (src_path, check_file [master_directory thy] src_path) thy;
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fun use_ml src_path =
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  if is_none (Context.thread_data ()) then
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    ML_Context.eval_file (#1 (check_file [Path.current] src_path))
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  else
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    let
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      val thy = ML_Context.the_global_context ();
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      val (path, id) = check_file [master_directory thy] src_path;
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      val _ = ML_Context.eval_file path;
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      val _ = Context.>> Local_Theory.propagate_ml_env;
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      val provide = provide (src_path, (path, id));
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      val _ = Context.>> (Context.mapping provide (Local_Theory.theory provide));
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    in () end;
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fun exec_ml src_path = ML_Context.exec (fn () => use_ml src_path);
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(* begin theory *)
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fun begin_theory dir name parents uses =
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  Theory.begin_theory name parents
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  |> master dir
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  |> fold (require o fst) uses
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  |> fold (fn (path, true) => Context.theory_map (exec_ml path) o Theory.checkpoint | _ => I) uses
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  |> Theory.checkpoint;
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end;
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structure Basic_Thy_Load: BASIC_THY_LOAD = Thy_Load;
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open Basic_Thy_Load;