1(*  Title:      Pure/context_position.ML
2    Author:     Makarius
3
4Context position visibility flag.
5*)
6
7signature CONTEXT_POSITION =
8sig
9  val is_visible_generic: Context.generic -> bool
10  val is_visible: Proof.context -> bool
11  val is_visible_global: theory -> bool
12  val set_visible_generic: bool -> Context.generic -> Context.generic
13  val set_visible: bool -> Proof.context -> Proof.context
14  val set_visible_global: bool -> theory -> theory
15  val is_really_visible: Proof.context -> bool
16  val not_really: Proof.context -> Proof.context
17  val restore_visible_generic: Context.generic -> Context.generic -> Context.generic
18  val restore_visible: Proof.context -> Proof.context -> Proof.context
19  val restore_visible_global: theory -> theory -> theory
20  val is_reported_generic: Context.generic -> Position.T -> bool
21  val is_reported: Proof.context -> Position.T -> bool
22  val report_generic: Context.generic -> Position.T -> Markup.T -> unit
23  val reported_text: Proof.context -> Position.T -> Markup.T -> string -> string
24  val report_text: Proof.context -> Position.T -> Markup.T -> string -> unit
25  val report: Proof.context -> Position.T -> Markup.T -> unit
26  val reports_text: Proof.context -> Position.report_text list -> unit
27  val reports: Proof.context -> Position.report list -> unit
28end;
29
30structure Context_Position: CONTEXT_POSITION =
31struct
32
33structure Data = Generic_Data
34(
35  type T = bool option * bool option;  (*really, visible*)
36  val empty: T = (NONE, NONE);
37  val extend = I;
38  fun merge ((a, b), (a', b')) : T = (merge_options (a, a'), merge_options (b, b'));
39);
40
41val is_visible_generic = the_default true o snd o Data.get;
42val is_visible = is_visible_generic o Context.Proof;
43val is_visible_global = is_visible_generic o Context.Theory;
44
45val set_visible_generic = Data.map o apsnd o K o SOME;
46val set_visible = Context.proof_map o Data.map o apsnd o K o SOME;
47val set_visible_global = Context.theory_map o Data.map o apsnd o K o SOME;
48
49val is_really = the_default true o fst o Data.get o Context.Proof;
50fun is_really_visible ctxt = is_really ctxt andalso is_visible ctxt;
51val not_really = Context.proof_map (Data.map (apfst (K (SOME false))));
52
53val restore_visible_generic = Data.put o Data.get;
54val restore_visible = Context.proof_map o Data.put o Data.get o Context.Proof;
55val restore_visible_global = Context.theory_map o Data.put o Data.get o Context.Theory;
56
57fun is_reported_generic context pos = is_visible_generic context andalso Position.is_reported pos;
58fun is_reported ctxt pos = is_visible ctxt andalso Position.is_reported pos;
59
60fun report_generic context pos markup =
61  if is_reported_generic context pos then
62    Output.report [Position.reported_text pos markup ""]
63  else ();
64
65fun reported_text ctxt pos markup txt =
66  if is_reported ctxt pos then Position.reported_text pos markup txt else "";
67
68fun report_text ctxt pos markup txt = Output.report [reported_text ctxt pos markup txt];
69fun report ctxt pos markup = report_text ctxt pos markup "";
70
71fun reports_text ctxt reps = if is_visible ctxt then Position.reports_text reps else ();
72fun reports ctxt reps = if is_visible ctxt then Position.reports reps else ();
73
74end;
75