/usr/share/ada/adainclude/opentoken/opentoken-recognizer-nothing.ads is in libopentoken4-dev 5.0a-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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--
-- Copyright (C) 1999 FlightSafety International and Ted Dennison
--
-- This file is part of the OpenToken package.
--
-- The OpenToken package is free software; you can redistribute it and/or
-- modify it under the terms of the GNU General Public License as published
-- by the Free Software Foundation; either version 3, or (at your option)
-- any later version. The OpenToken package is distributed in the hope that
-- it will be useful, but WITHOUT ANY WARRANTY; without even the implied
-- warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details. You should have received
-- a copy of the GNU General Public License distributed with the OpenToken
-- package; see file GPL.txt. If not, write to the Free Software Foundation,
-- 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
--
-- As a special exception, if other files instantiate generics from
-- this unit, or you link this unit with other files to produce an
-- executable, this unit does not by itself cause the resulting
-- executable to be covered by the GNU General Public License. This
-- exception does not however invalidate any other reasons why the
-- executable file might be covered by the GNU Public License.
--
-- This software was originally developed by the following company,
-- and was released as open-source software as a service to the
-- community:
--
-- FlightSafety International Simulation Systems Division
-- Broken Arrow, OK USA 918-259-4000
--
-------------------------------------------------------------------------------
-----------------------------------------------------------------------------
-- This package implements a token recognizer that recognizes
-- absolutely *Nothing*! Its intended use is for providing a good
-- default token for analyzers. But if you find another use for it,
-- be my guest....
-----------------------------------------------------------------------------
package OpenToken.Recognizer.Nothing is
type Instance is new OpenToken.Recognizer.Instance with private;
----------------------------------------------------------------------------
-- This procedure will be called to create a nothing token.
--
-- If this token is being used as a default token, then setting
-- reportable to "False" will allow you to completely ignore any
-- syntax errors.
--------------------------------------------------------------------------
function Get (Reportable : in Boolean := True) return Instance;
private
type Instance is new OpenToken.Recognizer.Instance with null record;
overriding procedure Clear (The_Token : in out Instance) is null;
overriding procedure Analyze
(The_Token : in out Instance;
Next_Char : in Character;
Verdict : out Analysis_Verdict);
end OpenToken.Recognizer.Nothing;
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