/usr/share/ada/adainclude/opentoken/opentoken-recognizer-identifier.ads is in libopentoken4-dev 5.0a-1.
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--
-- Copyright (C) 2012 Stephen 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
--
-------------------------------------------------------------------------------
-----------------------------------------------------------------------------
--  This package implements a token recognizer for an identifier. An
--  identifier is defined as a string starting with a character in a
--  given set of start characters and thereafter consisting of a
--  sequence of characters in the set of body characters. Single
--  underscores may be allowed inside identifiers. When the underscore
--  is in the set of characters, there is no restriction on its use.
--
--  If you use an identifier token with keyword tokens, they will
--  *both* typically match. So be sure to list the keyword tokens in
--  your syntax first, so that the keywords will take precedence.
-----------------------------------------------------------------------------
with Ada.Strings.Maps;
package OpenToken.Recognizer.Identifier is
   type Instance is new OpenToken.Recognizer.Instance with private;
   ----------------------------------------------------------------------------
   --  This procedure will be called to create an Identifier token.
   --
   --  Underscore ('_') is treated as a separator (as in Ada); only
   --  set Has_Separator false when your identifier allows multiple
   --  underscores in a row.
   --------------------------------------------------------------------------
   function Get
     (Start_Chars   : in Ada.Strings.Maps.Character_Set;
      Body_Chars    : in Ada.Strings.Maps.Character_Set;
      Has_Separator : in Boolean := True)
     return Instance;
private
   type State_ID is (First_Char, Text, Underscore, Done);
   type Instance is new OpenToken.Recognizer.Instance with record
      Start_Chars   : Ada.Strings.Maps.Character_Set;
      Body_Chars    : Ada.Strings.Maps.Character_Set;
      Has_Separator : Boolean;
      --  The finite state machine state
      State : State_ID := First_Char;
   end record;
   overriding procedure Clear (The_Token : in out Instance);
   overriding procedure Analyze
     (The_Token : in out Instance;
      Next_Char : in     Character;
      Verdict   :    out Analysis_Verdict);
end OpenToken.Recognizer.Identifier;
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