src/Pure/Isar/outer_syntax.ML
author wenzelm
Sat Apr 01 20:13:33 2000 +0200 (2000-04-01)
changeset 8652 39a695b0b1d7
parent 8583 34c4847fd8c1
child 8660 e5048a26e1d8
permissions -rw-r--r--
presentation ignore stuff: swallow newline;
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(*  Title:      Pure/Isar/outer_syntax.ML
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    ID:         $Id$
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    Author:     Markus Wenzel, TU Muenchen
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The global Isabelle/Isar outer syntax.
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*)
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signature BASIC_OUTER_SYNTAX =
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sig
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  val main: unit -> unit
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  val loop: unit -> unit
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  val sync_main: unit -> unit
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  val sync_loop: unit -> unit
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  val help: unit -> unit
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end;
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signature OUTER_SYNTAX =
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sig
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  include BASIC_OUTER_SYNTAX
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  structure Keyword:
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    sig
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      val control: string
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      val diag: string
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      val thy_begin: string
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      val thy_switch: string
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      val thy_end: string
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      val thy_heading: string
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      val thy_decl: string
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      val thy_goal: string
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      val qed: string
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      val qed_block: string
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      val qed_global: string
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      val prf_goal: string
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      val prf_block: string
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      val prf_chain: string
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      val prf_decl: string
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      val prf_asm: string
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      val prf_asm_goal: string
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      val prf_script: string
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      val kinds: string list
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    end
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  type token
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  type parser
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  val command: string -> string -> string ->
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    (token list -> (Toplevel.transition -> Toplevel.transition) * token list) -> parser
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  val markup_command: string -> string -> string ->
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    (token list -> (Toplevel.transition -> Toplevel.transition) * token list) -> parser
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  val verbatim_command: string -> string -> string ->
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    (token list -> (Toplevel.transition -> Toplevel.transition) * token list) -> parser
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  val improper_command: string -> string -> string ->
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    (token list -> (Toplevel.transition -> Toplevel.transition) * token list) -> parser
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  val dest_keywords: unit -> string list
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  val dest_parsers: unit -> (string * string * string * bool) list
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  val print_outer_syntax: unit -> unit
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  val print_help: Toplevel.transition -> Toplevel.transition
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  val add_keywords: string list -> unit
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  val add_parsers: parser list -> unit
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  val theory_header: token list -> (string * string list * (string * bool) list) * token list
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  val deps_thy: string -> bool -> Path.T -> string list * Path.T list
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  val load_thy: string -> bool -> bool -> Path.T -> unit
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  val isar: bool -> bool -> Toplevel.isar
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end;
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structure OuterSyntax: OUTER_SYNTAX =
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struct
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structure T = OuterLex;
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structure P = OuterParse;
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(** outer syntax **)
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(* command keyword classification *)
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structure Keyword =
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struct
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  val control = "control";
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  val diag = "diag";
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  val thy_begin = "theory-begin";
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  val thy_switch = "theory-switch";
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  val thy_end = "theory-end";
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  val thy_heading = "theory-heading";
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  val thy_decl = "theory-decl";
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  val thy_goal = "theory-goal";
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  val qed = "qed";
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  val qed_block = "qed-block";
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  val qed_global = "qed-global";
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  val prf_goal = "proof-goal";
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  val prf_block = "proof-block";
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  val prf_chain = "proof-chain";
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  val prf_decl = "proof-decl";
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  val prf_asm = "proof-asm";
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  val prf_asm_goal = "proof-asm-goal";
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  val prf_script = "proof-script";
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  val kinds = [control, diag, thy_begin, thy_switch, thy_end, thy_heading, thy_decl, thy_goal,
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    qed, qed_block, qed_global, prf_goal, prf_block, prf_chain, prf_decl, prf_asm, prf_asm_goal,
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    prf_script];
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end;
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(* parsers *)
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type token = T.token;
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type parser_fn = token list -> (Toplevel.transition -> Toplevel.transition) * token list;
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datatype parser =
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  Parser of string * (string * string * bool option) * bool * parser_fn;
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fun parser int_only markup name comment kind parse =
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  Parser (name, (comment, kind, markup), int_only, parse);
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(* parse command *)
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local
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fun command_body cmd (name, _) =
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  (case cmd name of
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    Some (int_only, parse) => P.!!! (Scan.prompt (name ^ "# ") (parse >> pair int_only))
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  | None => sys_error ("no parser for outer syntax command " ^ quote name));
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fun terminator false = Scan.succeed ()
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  | terminator true = P.group "terminator" (Scan.option P.sync -- P.$$$ ";" >> K ());
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in
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fun command term cmd =
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  P.$$$ ";" >> K None ||
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  P.sync >> K None ||
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  (P.position P.command :-- command_body cmd) --| terminator term
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    >> (fn ((name, pos), (int_only, f)) =>
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      Some (Toplevel.empty |> Toplevel.name name |> Toplevel.position pos |>
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        Toplevel.interactive int_only |> f));
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end;
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(** global syntax state **)
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local
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val global_lexicons = ref (Scan.empty_lexicon, Scan.empty_lexicon);
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val global_parsers =
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  ref (Symtab.empty: (((string * string) * (bool * parser_fn)) * bool option) Symtab.table);
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val global_markups = ref ([]: (string * bool) list);
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fun change_lexicons f =
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  let val lexs = f (! global_lexicons) in
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    (case (op inter_string) (pairself Scan.dest_lexicon lexs) of
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      [] => global_lexicons := lexs
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    | bads => error ("Clash of outer syntax commands and keywords: " ^ commas_quote bads))
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  end;
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fun get_markup (ms, (name, (_, Some m))) = (name, m) :: ms
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  | get_markup (ms, _) = ms;
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fun make_markups () = global_markups := Symtab.foldl get_markup ([], ! global_parsers);
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fun change_parsers f = (global_parsers := f (! global_parsers); make_markups ());
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in
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(* get current syntax *)
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(*Note: the syntax for files is statically determined at the very
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  beginning; for interactive processing it may change dynamically.*)
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fun get_lexicons () = ! global_lexicons;
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fun get_parsers () = ! global_parsers;
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fun get_parser () = apsome (#2 o #1) o curry Symtab.lookup (! global_parsers);
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fun lookup_markup name = assoc (! global_markups, name);
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fun is_markup name = if_none (lookup_markup name) false;
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fun is_verbatim name = if_none (apsome not (lookup_markup name)) false;
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(* augment syntax *)
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fun add_keywords keywords = change_lexicons (apfst (fn lex =>
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  (Scan.extend_lexicon lex (map Symbol.explode keywords))));
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fun add_parser (tab, Parser (name, (comment, kind, markup), int_only, parse)) =
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 (if is_none (Symtab.lookup (tab, name)) then ()
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  else warning ("Redefined outer syntax command " ^ quote name);
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  Symtab.update ((name, (((comment, kind), (int_only, parse)), markup)), tab));
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fun add_parsers parsers =
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  (change_parsers (fn tab => foldl add_parser (tab, parsers));
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    change_lexicons (apsnd (fn lex => Scan.extend_lexicon lex
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      (map (fn Parser (name, _, _, _) => Symbol.explode name) parsers))));
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end;
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(* print syntax *)
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fun dest_keywords () = Scan.dest_lexicon (#1 (get_lexicons ()));
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fun dest_parsers () =
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  map (fn (name, (((cmt, kind), (int_only, _)), _)) => (name, cmt, kind, int_only))
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    (Symtab.dest (get_parsers ()));
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fun print_outer_syntax () =
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  let
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    fun pretty_cmd (name, comment, _, _) =
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      Pretty.block [Pretty.str (name ^ ":"), Pretty.brk 2, Pretty.str comment];
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    val (int_cmds, cmds) = partition #4 (dest_parsers ());
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  in
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    Pretty.writeln (Pretty.strs ("syntax keywords:" :: map quote (dest_keywords ())));
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    Pretty.writeln (Pretty.big_list "proper commands:" (map pretty_cmd cmds));
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    Pretty.writeln (Pretty.big_list "improper commands (interactive-only):"
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      (map pretty_cmd int_cmds))
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  end;
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val print_help =
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  Toplevel.keep (fn state =>
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    let val opt_thy = try Toplevel.theory_of state in
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      print_outer_syntax ();
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      Method.help_methods opt_thy;
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      Attrib.help_attributes opt_thy
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    end);
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(** read theory **)
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(* special keywords *)
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val headerN = "header";
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val theoryN = "theory";
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val theory_keyword = P.$$$ theoryN;
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val header_keyword = P.$$$ headerN;
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val semicolon = P.$$$ ";";
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(* sources *)
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local
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val no_terminator =
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  Scan.unless semicolon (Scan.one (T.not_sync andf T.not_eof));
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val recover = Scan.prompt "recover# " (Scan.repeat no_terminator);
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in
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fun source term do_recover cmd src =
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  src
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  |> Source.source T.stopper
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    (Scan.bulk (fn xs => P.!!! (command term (cmd ())) xs))
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    (if do_recover then Some recover else None)
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  |> Source.mapfilter I;
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end;
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fun token_source (src, pos) =
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  src
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  |> Symbol.source false
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  |> T.source false (K (get_lexicons ())) pos;
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fun filter_proper src =
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  src
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  |> Source.filter T.is_proper;
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(* scan header *)
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fun scan_header get_lex scan (src, pos) =
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  src
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  |> Symbol.source false
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  |> T.source false (fn () => (get_lex (), Scan.empty_lexicon)) pos
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  |> filter_proper
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  |> Source.source T.stopper (Scan.single scan) None
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  |> (fst o the o Source.get_single);
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(* detect new/old header *)
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local
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val check_header_lexicon = Scan.make_lexicon [Symbol.explode headerN, Symbol.explode theoryN];
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val check_header = Scan.option (header_keyword || theory_keyword);
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in
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fun is_old_theory src = is_none (scan_header (K check_header_lexicon) check_header src);
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end;
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(* deps_thy --- inspect theory header *)
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local
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val header_lexicon =
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  Scan.make_lexicon (map Symbol.explode ["(", ")", "+", ":", ";", "=", "files", headerN, theoryN]);
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val file_name =
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  (P.$$$ "(" |-- P.!!! (P.name --| P.$$$ ")")) >> rpair false || P.name >> rpair true;
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in
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val theory_header =
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  (P.name -- (P.$$$ "=" |-- P.enum1 "+" P.name) --
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    Scan.optional (P.$$$ "files" |-- P.!!! (Scan.repeat1 file_name)) [] --|  P.$$$ ":")
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  >> (fn ((A, Bs), files) => (A, Bs, files));
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val new_header =
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  header_keyword |-- (P.!!! (P.text -- Scan.option semicolon -- theory_keyword |-- theory_header))
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    || theory_keyword |-- P.!!! theory_header;
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val old_header =
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  P.!!! (P.group "theory header"
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    (P.name -- (P.$$$ "=" |-- P.name -- Scan.repeat (P.$$$ "+" |-- P.name))))
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  >> (fn (A, (B, Bs)) => (A, B :: Bs, []: (string * bool) list));
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fun deps_thy name ml path =
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  let
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    val src = Source.of_string (File.read path);
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    val pos = Path.position path;
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    val (name', parents, files) =
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      (*unfortunately, old-style headers dynamically depend on the current lexicon*)
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      if is_old_theory (src, pos) then
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        scan_header ThySyn.get_lexicon (Scan.error old_header) (src, pos)
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      else scan_header (K header_lexicon) (Scan.error new_header) (src, pos);
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    val ml_path = ThyLoad.ml_path name;
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    val ml_file = if ml andalso is_some (ThyLoad.check_file ml_path) then [ml_path] else [];
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  in
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    if name <> name' then
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      error ("Filename " ^ quote (Path.pack path) ^
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        " does not agree with theory name " ^ quote name')
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    else (parents, map (Path.unpack o #1) files @ ml_file)
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  end;
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end;
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(* present theory source *)
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local
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val is_improper = not o (T.is_proper orf T.is_begin_ignore orf T.is_end_ignore);
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val improper = Scan.any is_improper;
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val improper_keep_indent = Scan.repeat
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  (Scan.unless (Scan.one T.is_indent -- Scan.one T.is_proper) (Scan.one is_improper));
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val improper_end =
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  (improper -- semicolon) |-- improper_keep_indent ||
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  improper_keep_indent;
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val ignore =
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  Scan.depend (fn d => Scan.one T.is_begin_ignore >> pair (d + 1)) ||
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  Scan.depend (fn 0 => Scan.fail | d => Scan.one T.is_end_ignore >> pair (d - 1)) ||
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  Scan.lift (Scan.one (OuterLex.not_eof andf (not o OuterLex.is_end_ignore)));
wenzelm@8583
   361
wenzelm@8652
   362
val opt_newline = Scan.option (Scan.one T.is_newline);
wenzelm@8652
   363
wenzelm@8583
   364
val ignore_stuff =
wenzelm@8652
   365
  opt_newline -- Scan.one T.is_begin_ignore --
wenzelm@8652
   366
    P.!!!! (Scan.pass 0 (Scan.repeat ignore) -- Scan.one T.is_end_ignore -- opt_newline);
wenzelm@8583
   367
wenzelm@7755
   368
val markup = Scan.one (T.is_kind T.Command andf is_markup o T.val_of) >> T.val_of;
wenzelm@7789
   369
val verbatim = Scan.one (T.is_kind T.Command andf is_verbatim o T.val_of);
wenzelm@7750
   370
wenzelm@7755
   371
val present_token =
wenzelm@8583
   372
  ignore_stuff >> K None ||
wenzelm@8583
   373
  (improper |-- markup -- P.!!!! (improper |-- P.text --| improper_end) >> Present.markup_token ||
wenzelm@8583
   374
    (P.$$$ "--" >> K "cmt") -- P.!!!! (improper |-- P.text) >> Present.markup_token ||
wenzelm@8583
   375
    (improper -- verbatim) |-- P.!!!! (improper |-- P.text --| improper_end)
wenzelm@8583
   376
      >> Present.verbatim_token ||
wenzelm@8583
   377
    Scan.one T.not_eof >> Present.basic_token) >> Some;
wenzelm@7750
   378
wenzelm@7750
   379
in
wenzelm@7750
   380
wenzelm@7750
   381
(*note: lazy evaluation ahead*)
wenzelm@7750
   382
wenzelm@7750
   383
fun present_toks text pos () =
wenzelm@7750
   384
  token_source (Source.of_list (Library.untabify text), pos)
wenzelm@8583
   385
  |> Source.source T.stopper (Scan.bulk (Scan.error present_token)) None
wenzelm@8583
   386
  |> Source.mapfilter I
wenzelm@7755
   387
  |> Source.exhaust;
wenzelm@7750
   388
wenzelm@7750
   389
fun present_text text () =
wenzelm@7750
   390
  Source.exhaust (Symbol.source false (Source.of_list (Library.untabify text)));
wenzelm@7750
   391
wenzelm@7750
   392
end;
wenzelm@7750
   393
wenzelm@7750
   394
wenzelm@6199
   395
(* load_thy --- read text (including header) *)
wenzelm@6199
   396
wenzelm@7746
   397
local
wenzelm@7746
   398
wenzelm@7940
   399
fun try_ml_file name time =
wenzelm@6199
   400
  let
wenzelm@6199
   401
    val path = ThyLoad.ml_path name;
wenzelm@7940
   402
    val tr = Toplevel.imperative (fn () => ThyInfo.load_file time path);
wenzelm@6247
   403
    val tr_name = if time then "time_use" else "use";
wenzelm@6199
   404
  in
wenzelm@7243
   405
    if is_none (ThyLoad.check_file path) then ()
wenzelm@7062
   406
    else Toplevel.excursion_error [Toplevel.empty |> Toplevel.name tr_name |> tr]
wenzelm@6199
   407
  end;
wenzelm@6199
   408
wenzelm@7683
   409
fun parse_thy src_pos =
wenzelm@7746
   410
  src_pos
wenzelm@7746
   411
  |> token_source
wenzelm@7746
   412
  |> filter_proper
wenzelm@7746
   413
  |> source false false (K (get_parser ()))
wenzelm@7746
   414
  |> Source.exhaust;
wenzelm@5829
   415
wenzelm@6247
   416
fun run_thy name path =
wenzelm@7683
   417
  let
wenzelm@7735
   418
    val text = explode (File.read path);
wenzelm@7735
   419
    val src = Source.of_list text;
wenzelm@7735
   420
    val pos = Path.position path;
wenzelm@7683
   421
  in
wenzelm@7735
   422
    Present.init_theory name;
wenzelm@7768
   423
    Present.verbatim_source name (present_text text);
wenzelm@8191
   424
    if is_old_theory (src, pos) then (ThySyn.load_thy name text;
wenzelm@8191
   425
      Present.old_symbol_source name (present_text text))   (*note: text presented twice!*)
wenzelm@7774
   426
    else (Toplevel.excursion_error (parse_thy (src, pos));
wenzelm@7774
   427
      Present.token_source name (present_toks text pos))
wenzelm@6247
   428
  end;
wenzelm@6199
   429
wenzelm@7746
   430
in
wenzelm@7746
   431
wenzelm@6199
   432
fun load_thy name ml time path =
wenzelm@6247
   433
 (if time then
wenzelm@6247
   434
    timeit (fn () =>
wenzelm@6247
   435
     (writeln ("\n**** Starting theory " ^ quote name ^ " ****");
wenzelm@6247
   436
      setmp Goals.proof_timing true (run_thy name) path;
wenzelm@6247
   437
      writeln ("**** Finished theory " ^ quote name ^ " ****\n")))
wenzelm@6247
   438
  else run_thy name path;
wenzelm@6247
   439
  Context.context (ThyInfo.get_theory name);
wenzelm@7940
   440
  if ml then try_ml_file name time else ());
wenzelm@5829
   441
wenzelm@7746
   442
end;
wenzelm@7746
   443
wenzelm@5829
   444
wenzelm@5829
   445
(* interactive source of state transformers *)
wenzelm@5829
   446
wenzelm@7333
   447
fun isar term no_pos =
wenzelm@5829
   448
  Source.tty
wenzelm@5829
   449
  |> Symbol.source true
wenzelm@7750
   450
  |> T.source true get_lexicons
wenzelm@7604
   451
    (if no_pos then Position.none else Position.line_name 1 "stdin")
wenzelm@7683
   452
  |> filter_proper
wenzelm@6860
   453
  |> source term true get_parser;
wenzelm@5829
   454
wenzelm@5829
   455
wenzelm@5829
   456
wenzelm@5829
   457
(** the read-eval-print loop **)
wenzelm@5829
   458
wenzelm@5923
   459
(* main loop *)
wenzelm@5923
   460
wenzelm@7333
   461
fun gen_loop term no_pos =
wenzelm@7333
   462
 (Context.reset_context ();
wenzelm@7333
   463
  Toplevel.loop (isar term no_pos));
wenzelm@5829
   464
wenzelm@7333
   465
fun gen_main term no_pos =
wenzelm@5829
   466
 (Toplevel.set_state Toplevel.toplevel;
wenzelm@6199
   467
  writeln (Session.welcome ());
wenzelm@7333
   468
  gen_loop term no_pos);
wenzelm@6860
   469
wenzelm@7333
   470
fun main () = gen_main false false;
wenzelm@7333
   471
fun loop () = gen_loop false false;
wenzelm@7333
   472
fun sync_main () = gen_main true true;
wenzelm@7333
   473
fun sync_loop () = gen_loop true true;
wenzelm@5829
   474
wenzelm@5829
   475
wenzelm@5829
   476
(* help *)
wenzelm@5829
   477
wenzelm@5829
   478
fun help () =
wenzelm@5829
   479
  writeln ("This is Isabelle's underlying ML system (" ^ ml_system ^ ");\n\
wenzelm@5883
   480
    \invoke 'loop();' to enter the Isar loop.");
wenzelm@5829
   481
wenzelm@5829
   482
wenzelm@6373
   483
(*final declarations of this structure!*)
wenzelm@7789
   484
val command = parser false None;
wenzelm@7789
   485
val markup_command = parser false (Some true);
wenzelm@7789
   486
val verbatim_command = parser false (Some false);
wenzelm@7789
   487
val improper_command = parser true None;
wenzelm@6685
   488
wenzelm@6373
   489
wenzelm@5829
   490
end;
wenzelm@5829
   491
wenzelm@6199
   492
(*setup theory syntax dependent operations*)
wenzelm@6199
   493
ThyLoad.deps_thy_fn := OuterSyntax.deps_thy;
wenzelm@6199
   494
ThyLoad.load_thy_fn := OuterSyntax.load_thy;
wenzelm@6199
   495
structure ThyLoad: THY_LOAD = ThyLoad;
wenzelm@6199
   496
wenzelm@5829
   497
structure BasicOuterSyntax: BASIC_OUTER_SYNTAX = OuterSyntax;
wenzelm@5829
   498
open BasicOuterSyntax;