/usr/share/ada/adainclude/opentoken/opentoken-token-linked_list.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) 2009 Stephe Leake
-- Copyright (C) 1999, 2000 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.Token.Linked_List is
procedure Free is new Ada.Unchecked_Deallocation (List_Node, List_Node_Ptr);
function Only (Subject : in OpenToken.Token.Handle) return Instance is
New_Node : constant List_Node_Ptr :=
new List_Node'(Token => Subject,
Count => 1,
Next => null
);
begin
return (Ada.Finalization.Controlled with
Head => New_Node,
Tail => New_Node
);
end Only;
function "&" (Left : in OpenToken.Token.Handle;
Right : in OpenToken.Token.Handle) return Instance is
Right_Node : constant List_Node_Ptr :=
new List_Node'(Token => Right,
Count => 1,
Next => null
);
begin
return (Ada.Finalization.Controlled with
Head => new List_Node'(Token => Left,
Count => 1,
Next => Right_Node
),
Tail => Right_Node
);
end "&";
function "&"
(Left : in OpenToken.Token.Handle;
Right : in Instance)
return Instance
is
Left_Node : constant List_Node_Ptr :=
new List_Node'(Token => Left,
Count => 1,
Next => Right.Head
);
Last_Node : List_Node_Ptr := Right.Tail;
begin
Right.Head.Count := Right.Head.Count + 1;
if Last_Node = null then
Last_Node := Left_Node;
end if;
return (Ada.Finalization.Controlled with
Head => Left_Node,
Tail => Last_Node
);
end "&";
function "&" (Left : in Instance;
Right : in OpenToken.Token.Handle) return Instance is
New_Node : constant List_Node_Ptr :=
new List_Node'(Token => Right,
Count => 1,
Next => null
);
First_Node : List_Node_Ptr;
begin
Left.Head.Count := Left.Head.Count + 1;
if Left.Tail = null then
First_Node := New_Node;
else
First_Node := Left.Head;
Left.Tail.Next := New_Node;
end if;
return (Ada.Finalization.Controlled with
Head => First_Node,
Tail => New_Node
);
end "&";
function "&" (Left : in Instance;
Right : in Instance) return Instance is
begin
Left.Tail.Next := Right.Head;
Left.Head.Count := Left.Head.Count + 1;
Right.Head.Count := Right.Head.Count + 1;
return (Ada.Finalization.Controlled with
Head => Left.Head,
Tail => Right.Tail
);
end "&";
procedure Enqueue
(List : in out Instance;
Token : in OpenToken.Token.Handle)
is
New_Node : constant List_Node_Ptr :=
new List_Node'(Token => Token,
Count => 1,
Next => List.Head
);
begin
if List.Tail = null then
List.Tail := New_Node;
end if;
List.Head := New_Node;
end Enqueue;
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, along with all their tokens
while Node /= null loop
Next := Node.Next;
Free (Node);
Node := Next;
end loop;
List.Head := null;
List.Tail := null;
end Clean;
--------------------------------------------------------------------------
-- A controlled object gets adjusted during an assignment,
-- immediately after making a bit-wise copy from the value on the
-- right hand side to the object on the left hand side.
--
-- When we assign one list object to another, we have to increment
-- the reference count, because there is now one more object
-- referring to that node
--
----------------------------------------------------------------------------
overriding procedure Adjust (List : in out Instance) is
begin
if List.Head /= null then
List.Head.Count := List.Head.Count + 1;
end if;
end Adjust;
--------------------------------------------------------------------------
-- Dereferencing of one node can cause a chain reaction of node
-- dereferences to occur. When the reference count for a node
-- drops to zero, you have to return the node to storage. That
-- means there's one less reference to the next node, so that next
-- node needs to have its reference count decremented. But if its
-- count goes to zero, then you have to dereference its next node,
-- and so on.
--
-- The recursion terminates when you decrement a node whose
-- reference count is greater than one, or you fall off the end of
-- the list (because the reference counts of all the nodes in the
-- list were one).
--
----------------------------------------------------------------------------
procedure Dereference (Node : in out List_Node_Ptr) is
begin
Node.Count := Node.Count - 1;
if Node.Count = 0 then
if Node.Next /= null then
Dereference (Node.Next);
end if;
-- Free the dynamicly allocated memory
Free (Node);
end if;
end Dereference;
--------------------------------------------------------------------------
-- A controlled object gets finalized immediately prior to the
-- bit-wise copy, and when the scope in which the object is
-- declared ends. When a list object is finalized, it means there
-- is one less list object pointing to the first node, so you have
-- to decrement the reference Count.
--
----------------------------------------------------------------------------
overriding procedure Finalize (List : in out Instance) is
begin
if List.Head /= null then
Dereference (List.Head);
if List.Head = null then
List.Tail := null;
end if;
end if;
end Finalize;
function Initial_Iterator (List : in Instance) return List_Iterator is
begin
return List_Iterator (List.Head);
end Initial_Iterator;
procedure Next_Token (Iterator : in out List_Iterator) is
begin
if Iterator /= null then
Iterator := List_Iterator (Iterator.Next);
end if;
end Next_Token;
function Token_Handle (Iterator : in List_Iterator) return OpenToken.Token.Handle is
begin
if Iterator = null then
return null;
end if;
return Iterator.Token;
end Token_Handle;
function Names (List : in List_Iterator) return String
is
Next_Iteration : List_Iterator := List;
This_Name : constant String := Name_Dispatch (Token_Handle (List));
begin
Next_Token (Next_Iteration);
if Next_Iteration = Null_Iterator then
return This_Name;
else
return This_Name & ", " & Names (Next_Iteration);
end if;
end Names;
function Names (List : in Instance) return String
is begin
return Names (Initial_Iterator (List));
end Names;
end OpenToken.Token.Linked_List;
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