/usr/share/ada/adainclude/opentoken/opentoken-recognizer-integer.adb is in libopentoken3-dev 4.0b-3.
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) 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;
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