/usr/share/ada/adainclude/opentoken/opentoken-production-list.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 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.
-----------------------------------------------------------------------------
with Ada.Unchecked_Deallocation;
package body OpenToken.Production.List is
procedure Free is new Ada.Unchecked_Deallocation (List_Node, List_Node_Ptr);
----------------------------------------------------------------------------
-- Create a production list from a single instance.
----------------------------------------------------------------------------
function Only (Subject : in OpenToken.Production.Instance) return Instance is
New_Node : constant List_Node_Ptr :=
new List_Node'(Production => Subject,
Next => null
);
begin
return (Head => New_Node,
Tail => New_Node
);
end Only;
----------------------------------------------------------------------------
-- Create a Production list from a pair of Production instances.
----------------------------------------------------------------------------
function "and" (Left : in OpenToken.Production.Instance;
Right : in OpenToken.Production.Instance) return Instance is
Right_Node : constant List_Node_Ptr :=
new List_Node'(Production => Right,
Next => null
);
begin
return (Head => new List_Node'(Production => Left,
Next => Right_Node
),
Tail => Right_Node
);
end "and";
----------------------------------------------------------------------------
-- Create a Production list from a Production instance and a Production list.
----------------------------------------------------------------------------
function "and" (Left : in OpenToken.Production.Instance;
Right : in Instance) return Instance is
begin
return (Head => new List_Node'(Production => Left,
Next => Right.Head
),
Tail => Right.Tail
);
end "and";
function "and" (Left : in Instance;
Right : in OpenToken.Production.Instance) return Instance is
New_Node : constant List_Node_Ptr :=
new List_Node'(Production => Right,
Next => null
);
begin
Left.Tail.Next := New_Node;
return (Head => Left.Head,
Tail => New_Node
);
end "and";
----------------------------------------------------------------------------
-- Create a Production list from a pair of Production lists.
----------------------------------------------------------------------------
function "and" (Left : in Instance;
Right : in Instance) return Instance is
begin
Left.Tail.Next := Right.Head;
return (Head => Left.Head,
Tail => Right.Tail
);
end "and";
--------------------------------------------------------------------------
-- This routine needs to be called when you are done using a list,
-- or want to reset it to empty.
--------------------------------------------------------------------------
procedure Clean (List : in out Instance) is
Node : List_Node_Ptr := List.Head;
Next : List_Node_Ptr;
begin
-- Deallocate all the nodes in the list
while Node /= null loop
Next := Node.Next;
Free (Node);
Node := Next;
end loop;
List.Head := null;
List.Tail := null;
end Clean;
----------------------------------------------------------------------------
-- Return an initialized iterator for traversing the Production list
----------------------------------------------------------------------------
function Initial_Iterator (List : in Instance) return List_Iterator is
begin
return List_Iterator (List.Head);
end Initial_Iterator;
----------------------------------------------------------------------------
-- Move the iterator down the list to the next Production.
----------------------------------------------------------------------------
procedure Next_Production (Iterator : in out List_Iterator) is
begin
if Iterator /= null then
Iterator := List_Iterator (Iterator.Next);
end if;
end Next_Production;
----------------------------------------------------------------------------
-- Return the next Production in the list.
----------------------------------------------------------------------------
function Get_Production (Iterator : in List_Iterator) return OpenToken.Production.Instance is
begin
if Iterator = null then
raise Iteration_Complete;
end if;
return Iterator.Production;
end Get_Production;
----------------------------------------------------------------------------
-- Return true if the iterator is at the last production.
----------------------------------------------------------------------------
function Last_Production (Iterator : in List_Iterator) return Boolean is
begin
return Iterator = null or else Iterator.Next = null;
end Last_Production;
----------------------------------------------------------------------------
-- Return true if the iterator past the last production.
----------------------------------------------------------------------------
function Past_Last (Iterator : in List_Iterator) return Boolean is
begin
return Iterator = null;
end Past_Last;
end OpenToken.Production.List;
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