src/Pure/context_position.ML
author wenzelm
Sun, 18 Mar 2012 13:04:22 +0100
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child 47813 18de60b8c906
permissions -rw-r--r--
maintain generic context naming in structure Name_Space (NB: empty = default_naming, init = local_naming); more explicit Context.generic for Name_Space.declare/define and derivatives (NB: naming changed after Proof_Context.init_global); prefer Context.pretty in low-level operations of structure Sorts/Type (defer full Syntax.init_pretty until error output); simplified signatures;
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(*  Title:      Pure/context_position.ML
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    Author:     Makarius
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Context position visibility flag.
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*)
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signature CONTEXT_POSITION =
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sig
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  val is_visible: Proof.context -> bool
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  val set_visible: bool -> Proof.context -> Proof.context
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  val restore_visible: Proof.context -> Proof.context -> Proof.context
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  val if_visible: Proof.context -> ('a -> unit) -> 'a -> unit
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  val is_visible_proof: Context.generic -> bool
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  val if_visible_proof: Context.generic -> ('a -> unit) -> 'a -> unit
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  val report_generic: Context.generic -> Position.T -> Markup.T -> unit
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  val reported_text: Proof.context -> Position.T -> Markup.T -> string -> string
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  val report_text: Proof.context -> Position.T -> Markup.T -> string -> unit
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  val report: Proof.context -> Position.T -> Markup.T -> unit
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  val reports: Proof.context -> Position.report list -> unit
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end;
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structure Context_Position: CONTEXT_POSITION =
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struct
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val visible = Config.bool (Config.declare "Context_Position.visible" (K (Config.Bool true)));
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fun is_visible ctxt = Config.get ctxt visible;
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val set_visible = Config.put visible;
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val restore_visible = set_visible o is_visible;
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fun if_visible ctxt f x = if is_visible ctxt then f x else ();
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fun is_visible_proof (Context.Proof ctxt) = is_visible ctxt
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  | is_visible_proof _ = false;
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fun if_visible_proof context f x = if is_visible_proof context then f x else ();
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fun report_generic context pos markup =
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  if Config.get_generic context visible then
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    Output.report (Position.reported_text pos markup "")
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  else ();
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fun reported_text ctxt pos markup txt =
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  if is_visible ctxt then Position.reported_text pos markup txt else "";
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fun report_text ctxt pos markup txt = Output.report (reported_text ctxt pos markup txt);
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fun report ctxt pos markup = report_text ctxt pos markup "";
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fun reports ctxt reps = if is_visible ctxt then Position.reports reps else ();
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end;