/usr/share/ada/adainclude/opentoken/opentoken-text_feeder.ads 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) 2012 Stephe Leake
-- Copyright (C) 1999 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 package provides an abstract text feeder class for use with
-- the token analyzer package.
-----------------------------------------------------------------------------
package OpenToken.Text_Feeder is
type Instance is abstract tagged null record;
type Text_Feeder_Ptr is access all Instance'Class;
----------------------------------------------------------------------------
-- This procedure returns strings for the analyzer.
--
-- Text_End should be set to the index of the last valid character
-- in New_Text. (If New_Text /= 1 then this will *not* be the same
-- as the length of the string!!)
--
-- Also keep these important facts in mind when writing your own
-- version of this routine:
--
-- o New_Text may be using any number for its 'First and 'Last attributes.
-- Don't assume New_Text'First is 1!
-- o New_Text'length will be > 0, but may be as small as 1.
-- o If the end of the text is reached, a Token.EOF_Character should be
-- retured.
--
----------------------------------------------------------------------------
procedure Get (Feeder : in out Instance;
New_Text : out String;
Text_End : out Integer) is abstract;
----------------------------------------------------------------------------
-- Return True if there is no more text to process.
----------------------------------------------------------------------------
function End_Of_Text (Feeder : Instance) return Boolean is abstract;
end OpenToken.Text_Feeder;
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