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/usr/share/ada/adainclude/opentoken/opentoken-recognizer-integer.adb is in libopentoken3-dev 4.0b-4.

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-------------------------------------------------------------------------------
--
-- Copyright (C) 2002, 2003 Stephen Leake
-- Copyright (C) 1999, 2000 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 a token of an integer.
-------------------------------------------------------------------------------
package body OpenToken.Recognizer.Integer is

   overriding procedure Clear (The_Token : in out Instance)
   is begin
      Extended_Digits.Clear (The_Token.Decimal_Recognizer);

      The_Token.Last_Verdict := Failed;
      The_Token.State        := First_Char;

   end Clear;

   overriding procedure Analyze
     (The_Token : in out Instance;
      Next_Char : in     Character;
      Verdict   :    out Analysis_Verdict)
   is
      Decimal_Verdict : Analysis_Verdict := Failed;

   begin

      case The_Token.State is

      when First_Char =>

         case Next_Char is
         when '-' | '+' =>
            if The_Token.Allow_Signs then
               The_Token.State := First_Numeral;
               Verdict         := So_Far_So_Good;
            else
               The_Token.State   := Done;
               Verdict           := Failed;
            end if;

         when others =>
            Extended_Digits.Analyze
              (The_Token => The_Token.Decimal_Recognizer,
               Next_Char => Next_Char,
               Verdict   => Decimal_Verdict);

            if Decimal_Verdict = Matches then
               The_Token.Check_Zero := Next_Char = '0' and not The_Token.Allow_Leading_Zero;
               Verdict         := Matches;
               The_Token.State := Numeral;
            else
               Verdict         := Failed;
               The_Token.State := Done;
            end if;
         end case;

      when First_Numeral =>

         Extended_Digits.Analyze
           (The_Token => The_Token.Decimal_Recognizer,
            Next_Char => Next_Char,
            Verdict   => Decimal_Verdict);

         if Decimal_Verdict = Matches then
            The_Token.Check_Zero := Next_Char = '0' and not The_Token.Allow_Leading_Zero;
            Verdict         := Matches;
            The_Token.State := Numeral;
         else
            Verdict         := Failed;
            The_Token.State := Done;
         end if;

      when Numeral =>
         --  If the numeral is a decimal integer, it matches.

         Extended_Digits.Analyze (The_Token.Decimal_Recognizer, Next_Char, Decimal_Verdict);

         case Decimal_Verdict is
         when So_Far_So_Good |  -- Next_Char is '_'
           Matches =>        --           or decimal digit
            if The_Token.Check_Zero then  -- The string in question is not "0".
               Verdict         := Failed;
               The_Token.State := Done;
            else
               Verdict := Decimal_Verdict;
            end if;
         when Failed =>
            if The_Token.Last_Verdict = Matches and
              (Next_Char = 'e' or Next_Char = 'E') and The_Token.Allow_Exponent then
               Verdict         := So_Far_So_Good;
               The_Token.State := Exponent_Sign;
            else
               Verdict         := Failed;
               The_Token.State := Done;
            end if;
         end case;

      when Exponent_Sign =>
         --  If it is a digit, it matches.
         --  If it is a sign , so-far-so-good...

         Extended_Digits.Clear (The_Token.Decimal_Recognizer);

         if Next_Char = '+' then

            Verdict         := So_Far_So_Good;
            The_Token.State := Exponent;

         else
            Extended_Digits.Analyze (The_Token.Decimal_Recognizer, Next_Char, Decimal_Verdict);

            if Decimal_Verdict = Matches then  -- a decimal digit
               Verdict         := Matches;
               The_Token.State := Exponent;
            else
               Verdict         := Failed;
               The_Token.State := Done;
            end if;

         end if;

      when Exponent =>
         --  If the exponent is a decimal integer, it matches.

         Extended_Digits.Analyze (The_Token.Decimal_Recognizer, Next_Char, Decimal_Verdict);

         case Decimal_Verdict is
         when So_Far_So_Good |   -- Next_Char is '_'
           Matches        =>  --           or decimal digit
            Verdict := Decimal_Verdict;
         when Failed =>
            Verdict         := Failed;
            The_Token.State := Done;
         end case;

      when Done =>

         --  We shouldn't get called from here.
         Verdict := Failed;

      end case;

      The_Token.Last_Verdict := Decimal_Verdict;

   end Analyze;

   ----------------------------------------------------------------------------
   --  This procedure will be called to create an integer token
   ----------------------------------------------------------------------------
   function Get (Allow_Underscores  : Boolean := True;
                 Allow_Exponent     : Boolean := True;
                 Allow_Leading_Zero : Boolean := True;
                 Allow_Signs        : Boolean := True) return Instance is
   begin

      return (Report             => True,
              Allow_Exponent     => Allow_Exponent,
              Allow_Leading_Zero => Allow_Leading_Zero,
              Allow_Signs        => Allow_Signs,
              Decimal_Recognizer => Extended_Digits.Get (Allow_Underscores => Allow_Underscores,
                                                         For_Base          => 10),
              Last_Verdict       => Failed,
              Check_Zero         => True,
              State              => First_Char);

   end Get;

end OpenToken.Recognizer.Integer;