src/Pure/context_position.ML
author wenzelm
Thu Aug 02 12:36:54 2012 +0200 (2012-08-02)
changeset 48646 91281e9472d8
parent 47813 18de60b8c906
child 48767 7f0c469cc796
permissions -rw-r--r--
more official command specifications, including source position;
     1 (*  Title:      Pure/context_position.ML
     2     Author:     Makarius
     3 
     4 Context position visibility flag.
     5 *)
     6 
     7 signature CONTEXT_POSITION =
     8 sig
     9   val is_visible: Proof.context -> bool
    10   val set_visible: bool -> Proof.context -> Proof.context
    11   val restore_visible: Proof.context -> Proof.context -> Proof.context
    12   val if_visible: Proof.context -> ('a -> unit) -> 'a -> unit
    13   val is_visible_proof: Context.generic -> bool
    14   val if_visible_proof: Context.generic -> ('a -> unit) -> 'a -> unit
    15   val report_generic: Context.generic -> Position.T -> Markup.T -> unit
    16   val reported_text: Proof.context -> Position.T -> Markup.T -> string -> string
    17   val report_text: Proof.context -> Position.T -> Markup.T -> string -> unit
    18   val report: Proof.context -> Position.T -> Markup.T -> unit
    19   val reports: Proof.context -> Position.report list -> unit
    20 end;
    21 
    22 structure Context_Position: CONTEXT_POSITION =
    23 struct
    24 
    25 structure Data = Generic_Data
    26 (
    27   type T = bool option;
    28   val empty: T = NONE;
    29   val extend = I;
    30   fun merge (x, y): T = if is_some x then x else y;
    31 );
    32 
    33 val is_visible_generic = the_default true o Data.get;
    34 val is_visible = is_visible_generic o Context.Proof;
    35 val set_visible = Context.proof_map o Data.put o SOME;
    36 val restore_visible = set_visible o is_visible;
    37 
    38 fun if_visible ctxt f x = if is_visible ctxt then f x else ();
    39 
    40 fun is_visible_proof (Context.Proof ctxt) = is_visible ctxt
    41   | is_visible_proof _ = false;
    42 
    43 fun if_visible_proof context f x = if is_visible_proof context then f x else ();
    44 
    45 fun report_generic context pos markup =
    46   if is_visible_generic context then
    47     Output.report (Position.reported_text pos markup "")
    48   else ();
    49 
    50 fun reported_text ctxt pos markup txt =
    51   if is_visible ctxt then Position.reported_text pos markup txt else "";
    52 
    53 fun report_text ctxt pos markup txt = Output.report (reported_text ctxt pos markup txt);
    54 fun report ctxt pos markup = report_text ctxt pos markup "";
    55 
    56 fun reports ctxt reps = if is_visible ctxt then Position.reports reps else ();
    57 
    58 end;