/usr/share/ada/adainclude/opentoken/opentoken-recognizer-based_integer_ada_style.ads is in libopentoken4-dev 5.0a-1.
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The actual contents of the file can be viewed below.
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--
-- Copyright (C) 1999 Christoph Karl Walter Grein
--
-- 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.
-------------------------------------------------------------------------------
with OpenToken.Recognizer.Extended_Digits;
-------------------------------------------------------------------------------
-- This package implements a token recognizer for an Ada style based integer.
-- Such an integer consists of a base indication, followed by a sequence of
-- extended digits enclosed by '#', optionally followed by an exponent.
-- A base indication is a string of decimal digits with a value in the range
-- 2..16.
-- An extended digit is either a decimal digit or a character in the range
-- 'a'..'f' in any letter case. The extended digit must be smaller than the
-- base.
-- An exponent specification is a letter 'e' (or 'E') followed by an optional
-- plus sign and decimal digits.
-- Each of the sequences of digits may be interspersed with one or more single
-- underscores (but must not end with an underscore).
-------------------------------------------------------------------------------
package OpenToken.Recognizer.Based_Integer_Ada_Style is
type Instance is new OpenToken.Recognizer.Instance with private;
----------------------------------------------------------------------------
-- This procedure will be called to create a Based Integer token.
----------------------------------------------------------------------------
function Get return Instance;
private
type State_ID is (Base, Numeral,
Exponent_E, Exponent_Sign, Exponent,
Done);
type Instance is new OpenToken.Recognizer.Instance with record
-- The finite state machine state
Number_Recognizer : Extended_Digits.Instance;
Last_Verdict : Analysis_Verdict := Failed;
State : State_ID := Base;
Base : Natural := 0;
end record;
----------------------------------------------------------------------------
-- This procedure will be called when analysis on a new candidate string
-- is started. The Token needs to clear its state (if any).
----------------------------------------------------------------------------
overriding procedure Clear (The_Token : in out Instance);
----------------------------------------------------------------------------
-- This procedure will be called to perform further analysis on a token
-- based on the given next character.
----------------------------------------------------------------------------
overriding procedure Analyze
(The_Token : in out Instance;
Next_Char : in Character;
Verdict : out Analysis_Verdict);
end OpenToken.Recognizer.Based_Integer_Ada_Style;
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