1.1 --- a/src/Pure/Isar/isar_output.ML	Sat Jan 08 09:30:16 2005 +0100
     1.2 +++ b/src/Pure/Isar/isar_output.ML	Tue Jan 11 14:08:07 2005 +0100
     1.3 @@ -20,11 +20,13 @@
     1.4      (Args.src -> Proof.context -> 'a -> string) -> Args.src -> Toplevel.state -> string
     1.5    datatype markup = Markup | MarkupEnv | Verbatim
     1.6    val interest_level: int ref
     1.7 +  val hide_commands: bool ref
     1.8 +  val add_hidden_commands: string list -> unit
     1.9    val modes: string list ref
    1.10    val eval_antiquote: Scan.lexicon -> Toplevel.state -> string * Position.T -> string
    1.11    val parse_thy: (markup -> OuterLex.token list -> OuterLex.token * OuterLex.token list) ->
    1.12      Scan.lexicon -> Toplevel.transition list -> (OuterLex.token, 'a) Source.source ->
    1.13 -      (Toplevel.transition * (Toplevel.state -> Buffer.T -> Buffer.T)) list * Buffer.T
    1.14 +      (Toplevel.transition * (Toplevel.state -> Toplevel.state -> Buffer.T -> Buffer.T)) list * Buffer.T
    1.15    val output_with: (Proof.context -> 'a -> Pretty.T) -> Args.src ->
    1.16      Proof.context -> 'a -> string
    1.17  end;
    1.18 @@ -183,10 +185,30 @@
    1.19  
    1.20  val interest_level = ref 0;
    1.21  
    1.22 -fun present_tokens lex (flag, toks) state =
    1.23 +val hide_commands = ref false;
    1.24 +val hidden_commands = ref ([] : string list);
    1.25 +
    1.26 +fun add_hidden_commands cmds = (hidden_commands := !hidden_commands @ cmds);
    1.27 +
    1.28 +fun is_proof state = (case Toplevel.node_of state of
    1.29 +  Toplevel.Theory _ => false | _ => true) handle Toplevel.UNDEF => false;
    1.30 +
    1.31 +fun is_newline (Latex.Basic tk, _) = T.is_newline tk
    1.32 +  | is_newline _ = false;
    1.33 +
    1.34 +fun is_hidden (Latex.Basic tk, _) =
    1.35 +      T.is_kind T.Command tk andalso T.val_of tk mem !hidden_commands
    1.36 +  | is_hidden _ = false;
    1.37 +
    1.38 +fun present_tokens lex (flag, toks) state' state =
    1.39    Buffer.add (case flag of None => "" | Some b => Latex.flag_markup b) o
    1.40 -   (toks
    1.41 -    |> mapfilter (fn (tk, i) => if i > ! interest_level then None else Some tk)
    1.42 +   ((if !hide_commands andalso exists (is_hidden o fst) toks then[]
    1.43 +     else mapfilter (fn (tk, i) =>
    1.44 +       if i > ! interest_level then None
    1.45 +       else if !hide_commands andalso is_proof state' then
    1.46 +         if not (is_proof state) andalso is_newline tk then Some tk
    1.47 +         else None
    1.48 +       else Some tk) toks)
    1.49      |> map (apsnd (eval_antiquote lex state))
    1.50      |> Latex.output_tokens
    1.51      |> Buffer.add);