src/Pure/Thy/thy_load.ML
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(*  Title:      Pure/Thy/thy_load.ML
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    Author:     Makarius
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Loading files that contribute to a theory.  Global master path for TTY loop.
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*)
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signature THY_LOAD =
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sig
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  val master_directory: theory -> Path.T
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  val imports_of: theory -> string list
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  val provide: Path.T * SHA1.digest -> theory -> theory
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  val check_file: Path.T -> Path.T -> Path.T
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  val thy_path: Path.T -> Path.T
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  val check_thy: Thy_Header.keywords -> Path.T -> string ->
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   {master: Path.T * SHA1.digest, text: string, imports: string list,
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    uses: (Path.T * bool) list, keywords: Thy_Header.keywords}
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  val load_file: theory -> Path.T -> (Path.T * SHA1.digest) * string
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  val use_file: Path.T -> theory -> string * theory
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  val loaded_files: theory -> Path.T list
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  val load_current: theory -> bool
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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 -> Thy_Header.header -> theory list -> theory
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  val load_thy: int -> Path.T -> Thy_Header.header -> Position.T -> string ->
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    theory list -> theory * unit future
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  val parse_files: string -> (theory -> Token.files) parser
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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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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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  imports: string list,  (*source specification of imports*)
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  provided: (Path.T * SHA1.digest) list};  (*source path, digest*)
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fun make_files (master_dir, imports, provided): files =
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 {master_dir = master_dir, imports = imports, 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, imports, provided} =>
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    make_files (f (master_dir, imports, provided)));
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val master_directory = #master_dir o Files.get;
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val imports_of = #imports o Files.get;
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fun put_deps master_dir imports = map_files (fn _ => (master_dir, imports, []));
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fun provide (src_path, id) =
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  map_files (fn (master_dir, imports, provided) =>
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    if AList.defined (op =) provided src_path then
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      error ("Duplicate use of source file: " ^ Path.print src_path)
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    else (master_dir, imports, (src_path, id) :: provided));
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(* inlined files *)
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fun check_file dir file = File.check_file (File.full_path dir file);
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local
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fun clean ((i1, t1) :: (i2, t2) :: toks) =
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      if Token.keyword_with (fn s => s = "%" orelse s = "--") t1 then clean toks
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      else (i1, t1) :: clean ((i2, t2) :: toks)
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  | clean toks = toks;
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fun clean_tokens toks =
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  ((0 upto length toks - 1) ~~ toks)
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  |> filter (fn (_, tok) => Token.is_proper tok)
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  |> clean;
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fun find_file toks =
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  rev (clean_tokens toks) |> get_first (fn (i, tok) =>
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    if Token.is_name tok then
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      SOME (i, Path.explode (Token.content_of tok))
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        handle ERROR msg => error (msg ^ Token.pos_of tok)
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    else NONE);
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fun command_files path exts =
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  if null exts then [path]
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  else map (fn ext => Path.ext ext path) exts;
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in
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fun find_files syntax text =
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  let val thy_load_commands = Keyword.thy_load_commands syntax in
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    if exists (fn (cmd, _) => String.isSubstring cmd text) thy_load_commands then
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      Thy_Syntax.parse_tokens (Keyword.lexicons_of syntax) Position.none text
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      |> Thy_Syntax.parse_spans
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      |> maps
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        (fn Thy_Syntax.Span (Thy_Syntax.Command (cmd, _), toks) =>
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              (case AList.lookup (op =) thy_load_commands cmd of
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                SOME exts =>
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                  (case find_file toks of
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                    SOME (_, path) => command_files path exts
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                  | NONE => [])
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              | NONE => [])
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          | _ => [])
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    else []
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  end;
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fun read_files cmd dir path =
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  let
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    val files =
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      command_files path (Keyword.command_files cmd)
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      |> map (check_file dir #> (fn p => (File.read p, Path.position p)));
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  in (dir, files) end;
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fun parse_files cmd =
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  Scan.ahead Parse.not_eof -- Parse.path >> (fn (tok, name) => fn thy =>
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    (case Token.get_files tok of
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      SOME files => files
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    | NONE => read_files cmd (master_directory thy) (Path.explode name)));
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fun resolve_files master_dir span =
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  (case span of
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    Thy_Syntax.Span (Thy_Syntax.Command (cmd, pos), toks) =>
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      if Keyword.is_theory_load cmd then
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        (case find_file toks of
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          NONE => error ("Bad file argument of command " ^ quote cmd ^ Position.str_of pos)
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        | SOME (i, path) =>
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            let
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              val toks' = toks |> map_index (fn (j, tok) =>
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                if i = j then Token.put_files (read_files cmd master_dir path) tok
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                else tok);
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            in Thy_Syntax.Span (Thy_Syntax.Command (cmd, pos), toks') end)
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      else span
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  | span => span);
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end;
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(* check files *)
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val thy_path = Path.ext "thy";
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fun check_thy base_keywords dir thy_name =
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  let
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    val path = thy_path (Path.basic thy_name);
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    val master_file = check_file dir path;
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    val text = File.read master_file;
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    val {name, imports, uses, keywords} = Thy_Header.read (Path.position master_file) text;
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    val _ = thy_name <> name andalso
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      error ("Bad file name " ^ Path.print path ^ " for theory " ^ quote name);
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    val syntax =
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      fold (Keyword.define_keywords o apsnd (Option.map Keyword.spec))
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        (keywords @ base_keywords) (Keyword.get_keywords ());
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    val more_uses = map (rpair false) (find_files syntax text);
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  in
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   {master = (master_file, SHA1.digest text), text = text,
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    imports = imports, uses = uses @ more_uses, keywords = keywords}
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  end;
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(* load files *)
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fun load_file thy src_path =
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  let
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    val full_path = check_file (master_directory thy) src_path;
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    val text = File.read full_path;
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    val id = SHA1.digest text;
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  in ((full_path, id), text) end;
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fun use_file src_path thy =
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  let
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    val ((_, id), text) = load_file thy src_path;
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    val thy' = provide (src_path, id) thy;
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  in (text, thy') end;
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fun loaded_files thy =
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  let val {master_dir, provided, ...} = Files.get thy
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  in map (File.full_path master_dir o #1) provided end;
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fun load_current thy =
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  #provided (Files.get thy) |>
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    forall (fn (src_path, id) =>
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      (case try (load_file thy) src_path of
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        NONE => false
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      | SOME ((_, id'), _) => id = id'));
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(* provide files *)
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fun eval_file path text = ML_Context.eval_text true (Path.position path) text;
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fun use_ml src_path =
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  if is_none (Context.thread_data ()) then
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    let val path = check_file Path.current src_path
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    in eval_file path (File.read path) end
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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), text) = load_file thy src_path;
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      val _ = eval_file path text;
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      val _ = Context.>> Local_Theory.propagate_ml_env;
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      val provide = provide (src_path, id);
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      val _ = Context.>> (Context.mapping provide (Local_Theory.background_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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(* load_thy *)
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fun begin_theory master_dir {name, imports, keywords, uses} parents =
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  Theory.begin_theory name parents
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  |> put_deps master_dir imports
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  |> fold Thy_Header.declare_keyword keywords
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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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fun excursion init elements =
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  let
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    val immediate = not (Goal.future_enabled ());
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    fun proof_result (tr, trs) (st, _) =
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      let
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        val (result, st') = Toplevel.proof_result immediate (tr, trs) st;
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        val pos' = Toplevel.pos_of (List.last (tr :: trs));
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      in (result, (st', pos')) end;
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    fun element_result elem x =
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      fold_map proof_result
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        (Outer_Syntax.read_element (#2 (Outer_Syntax.get_syntax ())) init elem) x;
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    val (results, (end_state, end_pos)) =
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      fold_map element_result elements (Toplevel.toplevel, Position.none);
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    val thy = Toplevel.end_theory end_pos end_state;
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  in (flat results, thy) end;
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fun load_thy update_time master_dir header pos text parents =
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  let
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    val time = ! Toplevel.timing;
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    val {name, uses, ...} = header;
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    val _ = Thy_Header.define_keywords header;
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    val _ = Present.init_theory name;
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    fun init () =
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      begin_theory master_dir header parents
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      |> Present.begin_theory update_time master_dir uses;
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    val lexs = Keyword.get_lexicons ();
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    val toks = Thy_Syntax.parse_tokens lexs pos text;
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    val spans = map (resolve_files master_dir) (Thy_Syntax.parse_spans toks);
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    val elements = Thy_Syntax.parse_elements spans;
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    val _ = Present.theory_source name
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      (fn () => HTML.html_mode (implode o map Thy_Syntax.present_span) spans);
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    val _ = if time then writeln ("\n**** Starting theory " ^ quote name ^ " ****") else ();
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    val (results, thy) = cond_timeit time "" (fn () => excursion init elements);
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    val _ = if time then writeln ("**** Finished theory " ^ quote name ^ " ****\n") else ();
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    val present =
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      singleton (Future.cond_forks {name = "Outer_Syntax.present:" ^ name, group = NONE,
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        deps = map Future.task_of results, pri = 0, interrupts = true})
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      (fn () =>
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        let val ((minor, _), outer_syntax) = Outer_Syntax.get_syntax () in
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          Thy_Output.present_thy minor Keyword.command_tags
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            (Outer_Syntax.is_markup outer_syntax)
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            (maps Future.join results) toks
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          |> Buffer.content
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          |> Present.theory_output name
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        end);
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  in (thy, present) end;
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(* global master path *)
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local
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  val master_path = Unsynchronized.ref Path.current;
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in
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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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6168
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end;
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42002
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end;