/usr/share/ada/adainclude/opentoken/opentoken-recognizer-octal_escape.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 escape sequence character.
-------------------------------------------------------------------------------
package body OpenToken.Recognizer.Octal_Escape 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
Extended_Digits.Clear (The_Token.Octal_Recognizer);
The_Token.State := Opening_Tick;
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 begin
case The_Token.State is
when Opening_Tick =>
if Next_Char = ''' then
Verdict := So_Far_So_Good;
The_Token.State := Escape;
else
Verdict := Failed;
The_Token.State := Done;
end if;
when Escape =>
if Next_Char = '\' then
Verdict := So_Far_So_Good;
The_Token.State := Octal_First;
else
Verdict := Failed;
The_Token.State := Done;
end if;
when Octal_First =>
Extended_Digits.Analyze (The_Token.Octal_Recognizer, Next_Char, Verdict);
if Verdict = Matches then
Verdict := So_Far_So_Good;
The_Token.State := Octal;
else
Verdict := Failed;
The_Token.State := Done;
end if;
when Octal =>
Extended_Digits.Analyze (The_Token.Octal_Recognizer, Next_Char, Verdict);
if Verdict = Matches then
Verdict := So_Far_So_Good;
elsif Next_Char = ''' then
Verdict := Matches;
The_Token.State := Done;
else
Verdict := Failed;
The_Token.State := Done;
end if;
when Done =>
Verdict := Failed;
end case;
end Analyze;
----------------------------------------------------------------------------
-- This procedure will be called to create a character set token
----------------------------------------------------------------------------
function Get return Instance is
begin
return (Report => True,
Octal_Recognizer => Extended_Digits.Get (For_Base => 8,
Allow_Underscores => False),
State => Opening_Tick);
end Get;
end OpenToken.Recognizer.Octal_Escape;
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