The global Isabelle/Isar outer syntax.
(* Title: Pure/Isar/outer_syntax.ML
ID: $Id$
Author: Markus Wenzel, TU Muenchen
The global Isabelle/Isar outer syntax.
*)
signature BASIC_OUTER_SYNTAX =
sig
val print_outer_syntax: unit -> unit
val main: unit -> unit
val main_loop: unit -> unit
val help: unit -> unit
end;
signature OUTER_SYNTAX =
sig
include BASIC_OUTER_SYNTAX
type token
type parser
val parser: bool -> string -> string ->
(token list -> (Toplevel.transition -> Toplevel.transition) * token list) -> parser
val add_keywords: string list -> unit
val add_parsers: parser list -> unit
val get_header: Position.T -> (string, 'a) Source.source -> (bstring * bstring list) option
val read_text: Position.T -> (string, 'a) Source.source -> Toplevel.transition list
val read_file: string -> Toplevel.transition list
val isar: Toplevel.isar
end;
structure OuterSyntax: OUTER_SYNTAX =
struct
open OuterParse;
(** outer syntax **)
(* parsers *)
type token = OuterLex.token;
type parser_fn = token list -> (Toplevel.transition -> Toplevel.transition) * token list;
datatype parser =
Parser of string * string * bool * parser_fn;
fun parser int_only name comment parse = Parser (name, comment, int_only, parse);
(* parse command *)
fun command_name cmd =
group "command"
(position (Scan.one (OuterLex.keyword_pred (is_some o cmd)) >> OuterLex.val_of));
fun command_body cmd (name, _) =
let val (int_only, parse) = the (cmd name)
in !!! (Scan.prompt (name ^ "# ") (parse >> pair int_only)) end;
fun command cmd =
$$$ ";" >> K None ||
command_name cmd :-- command_body cmd >> (fn ((name, pos), (int_only, f)) =>
Some (Toplevel.empty |> Toplevel.name name |> Toplevel.position pos |>
Toplevel.interactive int_only |> f));
(** global syntax state **)
val global_lexicon = ref Scan.empty_lexicon;
val global_parsers = ref (Symtab.empty: (string * (bool * parser_fn)) Symtab.table);
(* print syntax *)
fun print_outer_syntax () =
let
val keywords = map implode (Scan.dest_lexicon (! global_lexicon));
fun pretty_cmd (name, (comment, _)) =
Pretty.block [Pretty.str (name ^ ":"), Pretty.brk 2, Pretty.str comment];
val (int_cmds, cmds) = partition (#1 o #2 o #2) (Symtab.dest (! global_parsers));
in
Pretty.writeln (Pretty.strs ("keywords:" :: map quote keywords));
Pretty.writeln (Pretty.big_list "general commands:" (map pretty_cmd cmds));
Pretty.writeln (Pretty.big_list "interactive commands:" (map pretty_cmd int_cmds))
end;
(* augment syntax *)
fun add_keywords keywords =
global_lexicon := Scan.extend_lexicon (! global_lexicon) (map Symbol.explode keywords);
fun add_parser (tab, Parser (name, comment, int_only, parse)) =
(if is_none (Symtab.lookup (tab, name)) then ()
else warning ("Redefined outer syntax command " ^ quote name);
Symtab.update ((name, (comment, (int_only, parse))), tab));
fun add_parsers parsers =
(global_parsers := foldl add_parser (! global_parsers, parsers);
add_keywords (map (fn Parser (name, _, _, _) => name) parsers));
(* get current lexer / parser *)
(*Note: the syntax for files is statically determined at the very
beginning; for interactive processing it may change dynamically.*)
fun get_lexicon () = ! global_lexicon;
fun get_parser () = apsome snd o curry Symtab.lookup (! global_parsers);
(** read theory **)
(* source *)
fun no_command cmd =
Scan.one ((not o OuterLex.keyword_pred ((is_some o cmd) orf equal ";")) andf OuterLex.not_eof);
fun recover cmd =
Scan.prompt "recover# " (Scan.one OuterLex.not_eof -- Scan.repeat (no_command cmd));
fun source do_recover cmd src =
src
|> Source.source OuterLex.stopper (Scan.bulk (fn xs => !!! (command (cmd ())) xs))
(if do_recover then Some (fn xs => recover (cmd ()) xs) else None)
|> Source.mapfilter I;
(* detect header *)
val head_lexicon =
Scan.make_lexicon (map Symbol.explode ["+", ":", "=", "theory"]);
val head_parser =
$$$ "theory" |-- !!! (name -- ($$$ "=" |-- enum "+" name --| (Scan.ahead eof || $$$ ":")));
fun get_header pos src =
src
|> Symbol.source false
|> OuterLex.source false (K head_lexicon) pos
|> Source.source OuterLex.stopper (Scan.single (Scan.option head_parser)) None
|> (fst o the o Source.get_single);
(* read text (including header) *)
fun read_text pos src =
src
|> Symbol.source false
|> OuterLex.source false (K (get_lexicon ())) pos
|> source false (K (get_parser ()))
|> Source.exhaust;
fun read_file name = read_text (Position.line_name 1 (quote name)) (Source.of_file name);
(* interactive source of state transformers *)
val isar =
Source.tty
|> Symbol.source true
|> OuterLex.source true get_lexicon (Position.line_name 1 "stdin")
|> source true get_parser;
(** the read-eval-print loop **)
fun main_loop () = (Context.reset_context (); Toplevel.loop isar);
fun main () =
(Toplevel.set_state Toplevel.toplevel;
ml_prompts "ML> " "ML# ";
writeln ("\n\n" ^ Context.welcome ());
main_loop ());
(* help *)
fun help () =
writeln ("This is Isabelle's underlying ML system (" ^ ml_system ^ ");\n\
\invoke 'main_loop();' to enter the Isar loop.");
end;
structure BasicOuterSyntax: BASIC_OUTER_SYNTAX = OuterSyntax;
open BasicOuterSyntax;