src/Pure/Isar/outer_syntax.ML
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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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*)
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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 help: unit -> unit
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  val load: string -> 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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  type token
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  type parser
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  val parser: bool -> string -> string ->
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    (token list -> (Toplevel.transition -> Toplevel.transition) * token list) -> parser
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  val print_outer_syntax: unit -> unit
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  val commands: unit -> string list
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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 get_header: Position.T -> (string, 'a) Source.source -> (bstring * bstring list) option
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  val read_text: Position.T -> (string, 'a) Source.source -> Toplevel.transition list
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  val read_file: string -> Toplevel.transition list
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  val isar: Toplevel.isar
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end;
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structure OuterSyntax: OUTER_SYNTAX =
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struct
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open OuterParse;
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(** outer syntax **)
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(* parsers *)
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type token = OuterLex.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 * bool * parser_fn;
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fun parser int_only name comment parse = Parser (name, comment, int_only, parse);
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(* parse command *)
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fun command_name cmd =
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  group "command"
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    (position (Scan.one (OuterLex.keyword_pred (is_some o cmd)) >> OuterLex.val_of));
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fun command_body cmd (name, _) =
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  let val (int_only, parse) = the (cmd name)
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  in !!! (Scan.prompt (name ^ "# ") (parse >> pair int_only)) end;
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fun command cmd =
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  $$$ ";" >> K None ||
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  command_name cmd :-- command_body cmd >> (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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(** global syntax state **)
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val global_lexicon = ref Scan.empty_lexicon;
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val global_parsers = ref (Symtab.empty: (string * (bool * parser_fn)) Symtab.table);
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fun commands () = Symtab.keys (! global_parsers);
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(* print syntax *)
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fun print_outer_syntax () =
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  let
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    val keywords = map implode (Scan.dest_lexicon (! global_lexicon));
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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 (#1 o #2 o #2) (Symtab.dest (! global_parsers));
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  in
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    Pretty.writeln (Pretty.strs ("syntax keywords:" :: map quote 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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(* augment syntax *)
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fun add_keywords keywords =
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  global_lexicon := Scan.extend_lexicon (! global_lexicon) (map Symbol.explode keywords);
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fun add_parser (tab, Parser (name, comment, 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, (int_only, parse))), tab));
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fun add_parsers parsers =
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  (global_parsers := foldl add_parser (! global_parsers, parsers);
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    add_keywords (map (fn Parser (name, _, _, _) => name) parsers));
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(* get current lexer / parser *)
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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_lexicon () = ! global_lexicon;
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fun get_parser () = apsome snd o curry Symtab.lookup (! global_parsers);
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(** read theory **)
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(* source *)
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fun no_command cmd =
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  Scan.one ((not o OuterLex.keyword_pred ((is_some o cmd) orf equal ";")) andf OuterLex.not_eof);
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fun recover cmd =
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  Scan.prompt "recover# " (Scan.one OuterLex.not_eof -- Scan.repeat (no_command cmd));
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fun source do_recover cmd src =
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  src
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  |> Source.source OuterLex.stopper (Scan.bulk (fn xs => !!! (command (cmd ())) xs))
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    (if do_recover then Some (fn xs => recover (cmd ()) xs) else None)
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  |> Source.mapfilter I;
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(* detect header *)
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val head_lexicon =
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  Scan.make_lexicon (map Symbol.explode ["+", ":", "=", "theory"]);
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val head_parser =
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  $$$ "theory" |-- !!! (name -- ($$$ "=" |-- enum "+" name --| (Scan.ahead eof || $$$ ":")));
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fun get_header pos src =
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  src
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  |> Symbol.source false
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  |> OuterLex.source false (K head_lexicon) pos
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  |> Source.source OuterLex.stopper (Scan.single (Scan.option head_parser)) None
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  |> (fst o the o Source.get_single);
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(* read text (including header) *)
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fun read_text pos src =
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  src
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  |> Symbol.source false
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  |> OuterLex.source false (K (get_lexicon ())) pos
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  |> source false (K (get_parser ()))
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  |> Source.exhaust;
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fun read_file name = read_text (Position.line_name 1 (quote name)) (Source.of_file name);
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(* interactive source of state transformers *)
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val isar =
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  Source.tty
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  |> Symbol.source true
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  |> OuterLex.source true get_lexicon (Position.line_name 1 "stdin")
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  |> source true get_parser;
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(** the read-eval-print loop **)
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(* main loop *)
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fun loop () = (Context.reset_context (); Toplevel.loop isar);
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fun main () =
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 (Toplevel.set_state Toplevel.toplevel;
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  ml_prompts "ML> " "ML# ";
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  writeln (Context.welcome ());
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  loop ());
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(* load *)
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fun load name = Toplevel.excursion (read_file (name ^ ".thy"))
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  handle exn => error (Toplevel.exn_message exn);
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(* help *)
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fun help () =
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  writeln ("This is Isabelle's underlying ML system (" ^ ml_system ^ ");\n\
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    \invoke 'loop();' to enter the Isar loop.");
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end;
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structure BasicOuterSyntax: BASIC_OUTER_SYNTAX = OuterSyntax;
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open BasicOuterSyntax;