/usr/share/ada/adainclude/opentoken/opentoken.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) 2009, 2010, 2013 Stephe Leake
-- 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
--
-------------------------------------------------------------------------------
with Ada.Characters.Latin_1;
with Ada.Strings.Bounded;
-------------------------------------------------------------------------------
-- This package hierarchy implements a mostly full-strength parser.
-------------------------------------------------------------------------------
package OpenToken is
Syntax_Error : exception; -- no token matching current input could be found.
Parse_Error : exception; -- Input does not conform to the grammar
Grammar_Error : exception; -- Grammar is not consistent (ie unused tokens, missing productions)
User_Error : exception; -- other user error (ie command line parameter)
Programmer_Error : exception; -- a programming convention has been violated
-- We use this regardless of OS, since we need a standard way of
-- representing an end of line in a string buffer
EOL_Character : constant Character := Ada.Characters.Latin_1.CR;
-- Similarly, this is independent of OS
EOF_Character : constant Character := Ada.Characters.Latin_1.EOT;
-- The maximum length of a token. Token.Analizer.Get_More_Text
-- should return no more than this many characters minus the
-- largest reasonable token string. Tune it up if it bugs you.
Max_String_Length : constant := 1024;
package Buffers is new Ada.Strings.Bounded.Generic_Bounded_Length (Max_String_Length);
----------------------------------------------------------------------
-- If Trace_Parse, Parse prints helpful messages
----------------------------------------------------------------------
Trace_Parse : Boolean := False;
-- Put Message, indented by 3 * Trace_Indent; no new_line
procedure Trace_Put (Message : in String);
private
Trace_Indent : Integer := 0;
end OpenToken;
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