/usr/share/ada/adainclude/opentoken/opentoken-recognizer-based_integer_ada_style.adb is in libopentoken5-dev 6.0b-4.
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) 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.
-------------------------------------------------------------------------------
-------------------------------------------------------------------------------
-- This package implements a token recognizer for an Ada based integer literal.
-------------------------------------------------------------------------------
package body OpenToken.Recognizer.Based_Integer_Ada_Style is
----------------------------------------------------------------------------
-- 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) is
begin
The_Token.Number_Recognizer :=
Extended_Digits.Get (Allow_Underscores => True, For_Base => 10);
The_Token.Last_Verdict := Failed;
The_Token.State := Base;
The_Token.Base := 0;
end Clear;
----------------------------------------------------------------------------
-- 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)
is
Digits_Verdict : Analysis_Verdict := Failed;
begin
case The_Token.State is
when Base =>
-- If the base part is a decimal integer, so-far-so-good...
Extended_Digits.Analyze (The_Token.Number_Recognizer, Next_Char, Digits_Verdict);
case Digits_Verdict is
when So_Far_So_Good | -- Next_Char is '_'
Matches => -- or decimal digit
-- Keep a running total of the base. Verify that it isn't beyond the maximum.
if Next_Char /= '_' then
The_Token.Base := (The_Token.Base * 10) +
(Character'Pos (Next_Char) - Character'Pos ('0'));
if The_Token.Base <= Extended_Digits.Maximum_Base then
Verdict := So_Far_So_Good;
else
Verdict := Failed;
end if;
else
Verdict := So_Far_So_Good;
end if;
when Failed =>
if The_Token.Last_Verdict = Matches and Next_Char = '#' then
-- Set up the subrecognizer for integers of the specified base
The_Token.Number_Recognizer := Extended_Digits.Get
(Allow_Underscores => True,
For_Base => The_Token.Base);
Verdict := So_Far_So_Good;
The_Token.State := Numeral;
else
Verdict := Failed;
The_Token.State := Done;
end if;
end case;
when Numeral =>
-- If the numeral consists of extended digits, so-far-so-good...
-- If it is a '#', it matches.
Extended_Digits.Analyze (The_Token.Number_Recognizer, Next_Char, Digits_Verdict);
case Digits_Verdict is
when So_Far_So_Good | -- Next_Char is '_'
Matches => -- or extended digit
Verdict := So_Far_So_Good;
when Failed =>
if The_Token.Last_Verdict = Matches and Next_Char = '#' then
Verdict := Matches;
The_Token.State := Exponent_E;
else
Verdict := Failed;
The_Token.State := Done;
end if;
end case;
when Exponent_E =>
-- If the character is an e/E, so-far-so-good...
The_Token.Number_Recognizer := Extended_Digits.Get
(Allow_Underscores => True,
For_Base => 10);
if Next_Char = 'e' or Next_Char = 'E' then
Verdict := So_Far_So_Good;
The_Token.State := Exponent_Sign;
else
Verdict := Failed;
The_Token.State := Done;
end if;
when Exponent_Sign =>
-- If the first exponent character is a sign, so-far-so-good...
-- If it is a decimal digit, it matches.
if Next_Char = '+' then
Verdict := So_Far_So_Good;
The_Token.State := Exponent;
else
Extended_Digits.Analyze (The_Token.Number_Recognizer, Next_Char, Digits_Verdict);
if Digits_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.Number_Recognizer, Next_Char, Digits_Verdict);
case Digits_Verdict is
when So_Far_So_Good | -- Next_Char is '_'
Matches => -- or decimal digit
Verdict := Digits_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 := Digits_Verdict;
end Analyze;
----------------------------------------------------------------------------
-- This procedure will be called to create a Based Integer token
----------------------------------------------------------------------------
function Get return Instance is
begin
return (Report => True,
Number_Recognizer => Extended_Digits.Get (Allow_Underscores => True, For_Base => 10),
Last_Verdict => Failed,
State => Base,
Base => 0);
end Get;
end OpenToken.Recognizer.Based_Integer_Ada_Style;
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