src/Pure/context.ML
author wenzelm
Tue, 16 Jan 2001 00:35:50 +0100
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use_text etc.: proper output of error messages;
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(*  Title:      Pure/context.ML
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    ID:         $Id$
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    Author:     Markus Wenzel, TU Muenchen
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Global theory context.
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*)
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signature BASIC_CONTEXT =
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sig
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  val context: theory -> unit
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  val the_context: unit -> theory
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end;
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signature CONTEXT =
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sig
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  include BASIC_CONTEXT
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  val get_context: unit -> theory option
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  val set_context: theory option -> unit
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  val reset_context: unit -> unit
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  val setmp: theory option -> ('a -> 'b) -> 'a -> 'b
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  val pass: theory option -> ('a -> 'b) -> 'a -> 'b * theory option
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  val pass_theory: theory -> ('a -> 'b) -> 'a -> 'b * theory
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  val save: ('a -> 'b) -> 'a -> 'b
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  val >> : (theory -> theory) -> unit
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  val ml_output: (string -> unit) * (string -> unit)
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  val use_mltext: string -> bool -> theory option -> unit
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  val use_mltext_theory: string -> bool -> theory -> theory
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  val use_let: string -> string -> string -> theory -> theory
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  val use_setup: string -> theory -> theory
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end;
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structure Context: CONTEXT =
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struct
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(* theory context *)
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local
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  val current_theory = ref (None: theory option);
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in
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  fun get_context () = ! current_theory;
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  fun set_context opt_thy = current_theory := opt_thy;
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  fun setmp opt_thy f x = Library.setmp current_theory opt_thy f x;
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end;
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fun the_context () =
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  (case get_context () of
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    Some thy => thy
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  | _ => error "Unknown theory context");
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fun context thy = set_context (Some thy);
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fun reset_context () = set_context None;
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fun pass opt_thy f x =
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  setmp opt_thy (fn x => let val y = f x in (y, get_context ()) end) x;
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fun pass_theory thy f x =
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  (case pass (Some thy) f x of
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    (y, Some thy') => (y, thy')
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  | (_, None) => error "Lost theory context in ML");
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fun save f x = setmp (get_context ()) f x;
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(* map context *)
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nonfix >>;
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fun >> f = set_context (Some (f (the_context ())));
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(* use ML text *)
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val ml_output = (writeln, error_msg: string -> unit);
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fun use_mltext txt verb opt_thy = setmp opt_thy (fn () => use_text ml_output verb txt) ();
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fun use_mltext_theory txt verb thy = #2 (pass_theory thy (use_text ml_output verb) txt);
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fun use_context txt = use_mltext_theory ("Context.>> (" ^ txt ^ ");") false;
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fun use_let bind body txt =
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  use_context ("let " ^ bind ^ " = " ^ txt ^ " in\n" ^ body ^ " end");
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val use_setup =
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  use_let "val setup: (theory -> theory) list" "Library.apply setup";
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end;
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structure BasicContext: BASIC_CONTEXT = Context;
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open BasicContext;