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|
------------------------------------------------------------------------------
-- --
-- GNAT LIBRARY COMPONENTS --
-- --
-- ADA.CONTAINERS.RED_BLACK_TREES.GENERIC_SET_OPERATIONS --
-- --
-- B o d y --
-- --
-- Copyright (C) 2004-2009, Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 3, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- This unit was originally developed by Matthew J Heaney. --
------------------------------------------------------------------------------
with System; use type System.Address;
package body Ada.Containers.Red_Black_Trees.Generic_Set_Operations is
-----------------------
-- Local Subprograms --
-----------------------
procedure Clear (Tree : in out Tree_Type);
function Copy (Source : Tree_Type) return Tree_Type;
-----------
-- Clear --
-----------
procedure Clear (Tree : in out Tree_Type) is
pragma Assert (Tree.Busy = 0);
pragma Assert (Tree.Lock = 0);
Root : Node_Access := Tree.Root;
pragma Warnings (Off, Root);
begin
Tree.Root := null;
Tree.First := null;
Tree.Last := null;
Tree.Length := 0;
Delete_Tree (Root);
end Clear;
----------
-- Copy --
----------
function Copy (Source : Tree_Type) return Tree_Type is
Target : Tree_Type;
begin
if Source.Length = 0 then
return Target;
end if;
Target.Root := Copy_Tree (Source.Root);
Target.First := Tree_Operations.Min (Target.Root);
Target.Last := Tree_Operations.Max (Target.Root);
Target.Length := Source.Length;
return Target;
end Copy;
----------------
-- Difference --
----------------
procedure Difference (Target : in out Tree_Type; Source : Tree_Type) is
Tgt : Node_Access := Target.First;
Src : Node_Access := Source.First;
begin
if Target'Address = Source'Address then
if Target.Busy > 0 then
raise Program_Error with
"attempt to tamper with cursors (container is busy)";
end if;
Clear (Target);
return;
end if;
if Source.Length = 0 then
return;
end if;
if Target.Busy > 0 then
raise Program_Error with
"attempt to tamper with cursors (container is busy)";
end if;
loop
if Tgt = null then
return;
end if;
if Src = null then
return;
end if;
if Is_Less (Tgt, Src) then
Tgt := Tree_Operations.Next (Tgt);
elsif Is_Less (Src, Tgt) then
Src := Tree_Operations.Next (Src);
else
declare
X : Node_Access := Tgt;
begin
Tgt := Tree_Operations.Next (Tgt);
Tree_Operations.Delete_Node_Sans_Free (Target, X);
Free (X);
end;
Src := Tree_Operations.Next (Src);
end if;
end loop;
end Difference;
function Difference (Left, Right : Tree_Type) return Tree_Type is
Tree : Tree_Type;
L_Node : Node_Access := Left.First;
R_Node : Node_Access := Right.First;
Dst_Node : Node_Access;
pragma Warnings (Off, Dst_Node);
begin
if Left'Address = Right'Address then
return Tree; -- Empty set
end if;
if Left.Length = 0 then
return Tree; -- Empty set
end if;
if Right.Length = 0 then
return Copy (Left);
end if;
loop
if L_Node = null then
return Tree;
end if;
if R_Node = null then
while L_Node /= null loop
Insert_With_Hint
(Dst_Tree => Tree,
Dst_Hint => null,
Src_Node => L_Node,
Dst_Node => Dst_Node);
L_Node := Tree_Operations.Next (L_Node);
end loop;
return Tree;
end if;
if Is_Less (L_Node, R_Node) then
Insert_With_Hint
(Dst_Tree => Tree,
Dst_Hint => null,
Src_Node => L_Node,
Dst_Node => Dst_Node);
L_Node := Tree_Operations.Next (L_Node);
elsif Is_Less (R_Node, L_Node) then
R_Node := Tree_Operations.Next (R_Node);
else
L_Node := Tree_Operations.Next (L_Node);
R_Node := Tree_Operations.Next (R_Node);
end if;
end loop;
exception
when others =>
Delete_Tree (Tree.Root);
raise;
end Difference;
------------------
-- Intersection --
------------------
procedure Intersection
(Target : in out Tree_Type;
Source : Tree_Type)
is
Tgt : Node_Access := Target.First;
Src : Node_Access := Source.First;
begin
if Target'Address = Source'Address then
return;
end if;
if Target.Busy > 0 then
raise Program_Error with
"attempt to tamper with cursors (container is busy)";
end if;
if Source.Length = 0 then
Clear (Target);
return;
end if;
while Tgt /= null
and then Src /= null
loop
if Is_Less (Tgt, Src) then
declare
X : Node_Access := Tgt;
begin
Tgt := Tree_Operations.Next (Tgt);
Tree_Operations.Delete_Node_Sans_Free (Target, X);
Free (X);
end;
elsif Is_Less (Src, Tgt) then
Src := Tree_Operations.Next (Src);
else
Tgt := Tree_Operations.Next (Tgt);
Src := Tree_Operations.Next (Src);
end if;
end loop;
while Tgt /= null loop
declare
X : Node_Access := Tgt;
begin
Tgt := Tree_Operations.Next (Tgt);
Tree_Operations.Delete_Node_Sans_Free (Target, X);
Free (X);
end;
end loop;
end Intersection;
function Intersection (Left, Right : Tree_Type) return Tree_Type is
Tree : Tree_Type;
L_Node : Node_Access := Left.First;
R_Node : Node_Access := Right.First;
Dst_Node : Node_Access;
pragma Warnings (Off, Dst_Node);
begin
if Left'Address = Right'Address then
return Copy (Left);
end if;
loop
if L_Node = null then
return Tree;
end if;
if R_Node = null then
return Tree;
end if;
if Is_Less (L_Node, R_Node) then
L_Node := Tree_Operations.Next (L_Node);
elsif Is_Less (R_Node, L_Node) then
R_Node := Tree_Operations.Next (R_Node);
else
Insert_With_Hint
(Dst_Tree => Tree,
Dst_Hint => null,
Src_Node => L_Node,
Dst_Node => Dst_Node);
L_Node := Tree_Operations.Next (L_Node);
R_Node := Tree_Operations.Next (R_Node);
end if;
end loop;
exception
when others =>
Delete_Tree (Tree.Root);
raise;
end Intersection;
---------------
-- Is_Subset --
---------------
function Is_Subset
(Subset : Tree_Type;
Of_Set : Tree_Type) return Boolean
is
begin
if Subset'Address = Of_Set'Address then
return True;
end if;
if Subset.Length > Of_Set.Length then
return False;
end if;
declare
Subset_Node : Node_Access := Subset.First;
Set_Node : Node_Access := Of_Set.First;
begin
loop
if Set_Node = null then
return Subset_Node = null;
end if;
if Subset_Node = null then
return True;
end if;
if Is_Less (Subset_Node, Set_Node) then
return False;
end if;
if Is_Less (Set_Node, Subset_Node) then
Set_Node := Tree_Operations.Next (Set_Node);
else
Set_Node := Tree_Operations.Next (Set_Node);
Subset_Node := Tree_Operations.Next (Subset_Node);
end if;
end loop;
end;
end Is_Subset;
-------------
-- Overlap --
-------------
function Overlap (Left, Right : Tree_Type) return Boolean is
L_Node : Node_Access := Left.First;
R_Node : Node_Access := Right.First;
begin
if Left'Address = Right'Address then
return Left.Length /= 0;
end if;
loop
if L_Node = null
or else R_Node = null
then
return False;
end if;
if Is_Less (L_Node, R_Node) then
L_Node := Tree_Operations.Next (L_Node);
elsif Is_Less (R_Node, L_Node) then
R_Node := Tree_Operations.Next (R_Node);
else
return True;
end if;
end loop;
end Overlap;
--------------------------
-- Symmetric_Difference --
--------------------------
procedure Symmetric_Difference
(Target : in out Tree_Type;
Source : Tree_Type)
is
Tgt : Node_Access := Target.First;
Src : Node_Access := Source.First;
New_Tgt_Node : Node_Access;
pragma Warnings (Off, New_Tgt_Node);
begin
if Target.Busy > 0 then
raise Program_Error with
"attempt to tamper with cursors (container is busy)";
end if;
if Target'Address = Source'Address then
Clear (Target);
return;
end if;
loop
if Tgt = null then
while Src /= null loop
Insert_With_Hint
(Dst_Tree => Target,
Dst_Hint => null,
Src_Node => Src,
Dst_Node => New_Tgt_Node);
Src := Tree_Operations.Next (Src);
end loop;
return;
end if;
if Src = null then
return;
end if;
if Is_Less (Tgt, Src) then
Tgt := Tree_Operations.Next (Tgt);
elsif Is_Less (Src, Tgt) then
Insert_With_Hint
(Dst_Tree => Target,
Dst_Hint => Tgt,
Src_Node => Src,
Dst_Node => New_Tgt_Node);
Src := Tree_Operations.Next (Src);
else
declare
X : Node_Access := Tgt;
begin
Tgt := Tree_Operations.Next (Tgt);
Tree_Operations.Delete_Node_Sans_Free (Target, X);
Free (X);
end;
Src := Tree_Operations.Next (Src);
end if;
end loop;
end Symmetric_Difference;
function Symmetric_Difference (Left, Right : Tree_Type) return Tree_Type is
Tree : Tree_Type;
L_Node : Node_Access := Left.First;
R_Node : Node_Access := Right.First;
Dst_Node : Node_Access;
pragma Warnings (Off, Dst_Node);
begin
if Left'Address = Right'Address then
return Tree; -- Empty set
end if;
if Right.Length = 0 then
return Copy (Left);
end if;
if Left.Length = 0 then
return Copy (Right);
end if;
loop
if L_Node = null then
while R_Node /= null loop
Insert_With_Hint
(Dst_Tree => Tree,
Dst_Hint => null,
Src_Node => R_Node,
Dst_Node => Dst_Node);
R_Node := Tree_Operations.Next (R_Node);
end loop;
return Tree;
end if;
if R_Node = null then
while L_Node /= null loop
Insert_With_Hint
(Dst_Tree => Tree,
Dst_Hint => null,
Src_Node => L_Node,
Dst_Node => Dst_Node);
L_Node := Tree_Operations.Next (L_Node);
end loop;
return Tree;
end if;
if Is_Less (L_Node, R_Node) then
Insert_With_Hint
(Dst_Tree => Tree,
Dst_Hint => null,
Src_Node => L_Node,
Dst_Node => Dst_Node);
L_Node := Tree_Operations.Next (L_Node);
elsif Is_Less (R_Node, L_Node) then
Insert_With_Hint
(Dst_Tree => Tree,
Dst_Hint => null,
Src_Node => R_Node,
Dst_Node => Dst_Node);
R_Node := Tree_Operations.Next (R_Node);
else
L_Node := Tree_Operations.Next (L_Node);
R_Node := Tree_Operations.Next (R_Node);
end if;
end loop;
exception
when others =>
Delete_Tree (Tree.Root);
raise;
end Symmetric_Difference;
-----------
-- Union --
-----------
procedure Union (Target : in out Tree_Type; Source : Tree_Type)
is
Hint : Node_Access;
procedure Process (Node : Node_Access);
pragma Inline (Process);
procedure Iterate is new Tree_Operations.Generic_Iteration (Process);
-------------
-- Process --
-------------
procedure Process (Node : Node_Access) is
begin
Insert_With_Hint
(Dst_Tree => Target,
Dst_Hint => Hint,
Src_Node => Node,
Dst_Node => Hint);
end Process;
-- Start of processing for Union
begin
if Target'Address = Source'Address then
return;
end if;
if Target.Busy > 0 then
raise Program_Error with
"attempt to tamper with cursors (container is busy)";
end if;
Iterate (Source);
end Union;
function Union (Left, Right : Tree_Type) return Tree_Type is
begin
if Left'Address = Right'Address then
return Copy (Left);
end if;
if Left.Length = 0 then
return Copy (Right);
end if;
if Right.Length = 0 then
return Copy (Left);
end if;
declare
Tree : Tree_Type := Copy (Left);
Hint : Node_Access;
procedure Process (Node : Node_Access);
pragma Inline (Process);
procedure Iterate is
new Tree_Operations.Generic_Iteration (Process);
-------------
-- Process --
-------------
procedure Process (Node : Node_Access) is
begin
Insert_With_Hint
(Dst_Tree => Tree,
Dst_Hint => Hint,
Src_Node => Node,
Dst_Node => Hint);
end Process;
-- Start of processing for Union
begin
Iterate (Right);
return Tree;
exception
when others =>
Delete_Tree (Tree.Root);
raise;
end;
end Union;
end Ada.Containers.Red_Black_Trees.Generic_Set_Operations;
|
