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-------------------------------------------------------------------------------
--- --
--- GNAT LIBRARY COMPONENTS --
--- --
--- ADA.CONTAINERS.INDEFINITE_ORDERED_MAPS --
--- --
--- B o d y --
--- --
--- Copyright (C) 2004-2012, 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 Ada.Unchecked_Deallocation;
-
-with Ada.Containers.Red_Black_Trees.Generic_Operations;
-pragma Elaborate_All (Ada.Containers.Red_Black_Trees.Generic_Operations);
-
-with Ada.Containers.Red_Black_Trees.Generic_Keys;
-pragma Elaborate_All (Ada.Containers.Red_Black_Trees.Generic_Keys);
-
-with System; use type System.Address;
-
-package body Ada.Containers.Indefinite_Ordered_Maps is
- pragma Suppress (All_Checks);
-
- type Iterator is new Limited_Controlled and
- Map_Iterator_Interfaces.Reversible_Iterator with
- record
- Container : Map_Access;
- Node : Node_Access;
- end record;
-
- overriding procedure Finalize (Object : in out Iterator);
-
- overriding function First (Object : Iterator) return Cursor;
- overriding function Last (Object : Iterator) return Cursor;
-
- overriding function Next
- (Object : Iterator;
- Position : Cursor) return Cursor;
-
- overriding function Previous
- (Object : Iterator;
- Position : Cursor) return Cursor;
-
- -----------------------------
- -- Node Access Subprograms --
- -----------------------------
-
- -- These subprograms provide a functional interface to access fields
- -- of a node, and a procedural interface for modifying these values.
-
- function Color (Node : Node_Access) return Color_Type;
- pragma Inline (Color);
-
- function Left (Node : Node_Access) return Node_Access;
- pragma Inline (Left);
-
- function Parent (Node : Node_Access) return Node_Access;
- pragma Inline (Parent);
-
- function Right (Node : Node_Access) return Node_Access;
- pragma Inline (Right);
-
- procedure Set_Parent (Node : Node_Access; Parent : Node_Access);
- pragma Inline (Set_Parent);
-
- procedure Set_Left (Node : Node_Access; Left : Node_Access);
- pragma Inline (Set_Left);
-
- procedure Set_Right (Node : Node_Access; Right : Node_Access);
- pragma Inline (Set_Right);
-
- procedure Set_Color (Node : Node_Access; Color : Color_Type);
- pragma Inline (Set_Color);
-
- -----------------------
- -- Local Subprograms --
- -----------------------
-
- function Copy_Node (Source : Node_Access) return Node_Access;
- pragma Inline (Copy_Node);
-
- procedure Free (X : in out Node_Access);
-
- function Is_Equal_Node_Node
- (L, R : Node_Access) return Boolean;
- pragma Inline (Is_Equal_Node_Node);
-
- function Is_Greater_Key_Node
- (Left : Key_Type;
- Right : Node_Access) return Boolean;
- pragma Inline (Is_Greater_Key_Node);
-
- function Is_Less_Key_Node
- (Left : Key_Type;
- Right : Node_Access) return Boolean;
- pragma Inline (Is_Less_Key_Node);
-
- --------------------------
- -- Local Instantiations --
- --------------------------
-
- package Tree_Operations is
- new Red_Black_Trees.Generic_Operations (Tree_Types);
-
- procedure Delete_Tree is
- new Tree_Operations.Generic_Delete_Tree (Free);
-
- function Copy_Tree is
- new Tree_Operations.Generic_Copy_Tree (Copy_Node, Delete_Tree);
-
- use Tree_Operations;
-
- package Key_Ops is
- new Red_Black_Trees.Generic_Keys
- (Tree_Operations => Tree_Operations,
- Key_Type => Key_Type,
- Is_Less_Key_Node => Is_Less_Key_Node,
- Is_Greater_Key_Node => Is_Greater_Key_Node);
-
- procedure Free_Key is
- new Ada.Unchecked_Deallocation (Key_Type, Key_Access);
-
- procedure Free_Element is
- new Ada.Unchecked_Deallocation (Element_Type, Element_Access);
-
- function Is_Equal is
- new Tree_Operations.Generic_Equal (Is_Equal_Node_Node);
-
- ---------
- -- "<" --
- ---------
-
- function "<" (Left, Right : Cursor) return Boolean is
- begin
- if Left.Node = null then
- raise Constraint_Error with "Left cursor of ""<"" equals No_Element";
- end if;
-
- if Right.Node = null then
- raise Constraint_Error with "Right cursor of ""<"" equals No_Element";
- end if;
-
- if Left.Node.Key = null then
- raise Program_Error with "Left cursor in ""<"" is bad";
- end if;
-
- if Right.Node.Key = null then
- raise Program_Error with "Right cursor in ""<"" is bad";
- end if;
-
- pragma Assert (Vet (Left.Container.Tree, Left.Node),
- "Left cursor in ""<"" is bad");
-
- pragma Assert (Vet (Right.Container.Tree, Right.Node),
- "Right cursor in ""<"" is bad");
-
- return Left.Node.Key.all < Right.Node.Key.all;
- end "<";
-
- function "<" (Left : Cursor; Right : Key_Type) return Boolean is
- begin
- if Left.Node = null then
- raise Constraint_Error with "Left cursor of ""<"" equals No_Element";
- end if;
-
- if Left.Node.Key = null then
- raise Program_Error with "Left cursor in ""<"" is bad";
- end if;
-
- pragma Assert (Vet (Left.Container.Tree, Left.Node),
- "Left cursor in ""<"" is bad");
-
- return Left.Node.Key.all < Right;
- end "<";
-
- function "<" (Left : Key_Type; Right : Cursor) return Boolean is
- begin
- if Right.Node = null then
- raise Constraint_Error with "Right cursor of ""<"" equals No_Element";
- end if;
-
- if Right.Node.Key = null then
- raise Program_Error with "Right cursor in ""<"" is bad";
- end if;
-
- pragma Assert (Vet (Right.Container.Tree, Right.Node),
- "Right cursor in ""<"" is bad");
-
- return Left < Right.Node.Key.all;
- end "<";
-
- ---------
- -- "=" --
- ---------
-
- function "=" (Left, Right : Map) return Boolean is
- begin
- return Is_Equal (Left.Tree, Right.Tree);
- end "=";
-
- ---------
- -- ">" --
- ---------
-
- function ">" (Left, Right : Cursor) return Boolean is
- begin
- if Left.Node = null then
- raise Constraint_Error with "Left cursor of "">"" equals No_Element";
- end if;
-
- if Right.Node = null then
- raise Constraint_Error with "Right cursor of "">"" equals No_Element";
- end if;
-
- if Left.Node.Key = null then
- raise Program_Error with "Left cursor in ""<"" is bad";
- end if;
-
- if Right.Node.Key = null then
- raise Program_Error with "Right cursor in ""<"" is bad";
- end if;
-
- pragma Assert (Vet (Left.Container.Tree, Left.Node),
- "Left cursor in "">"" is bad");
-
- pragma Assert (Vet (Right.Container.Tree, Right.Node),
- "Right cursor in "">"" is bad");
-
- return Right.Node.Key.all < Left.Node.Key.all;
- end ">";
-
- function ">" (Left : Cursor; Right : Key_Type) return Boolean is
- begin
- if Left.Node = null then
- raise Constraint_Error with "Left cursor of "">"" equals No_Element";
- end if;
-
- if Left.Node.Key = null then
- raise Program_Error with "Left cursor in ""<"" is bad";
- end if;
-
- pragma Assert (Vet (Left.Container.Tree, Left.Node),
- "Left cursor in "">"" is bad");
-
- return Right < Left.Node.Key.all;
- end ">";
-
- function ">" (Left : Key_Type; Right : Cursor) return Boolean is
- begin
- if Right.Node = null then
- raise Constraint_Error with "Right cursor of "">"" equals No_Element";
- end if;
-
- if Right.Node.Key = null then
- raise Program_Error with "Right cursor in ""<"" is bad";
- end if;
-
- pragma Assert (Vet (Right.Container.Tree, Right.Node),
- "Right cursor in "">"" is bad");
-
- return Right.Node.Key.all < Left;
- end ">";
-
- ------------
- -- Adjust --
- ------------
-
- procedure Adjust is new Tree_Operations.Generic_Adjust (Copy_Tree);
-
- procedure Adjust (Container : in out Map) is
- begin
- Adjust (Container.Tree);
- end Adjust;
-
- procedure Adjust (Control : in out Reference_Control_Type) is
- begin
- if Control.Container /= null then
- declare
- T : Tree_Type renames Control.Container.all.Tree;
- B : Natural renames T.Busy;
- L : Natural renames T.Lock;
- begin
- B := B + 1;
- L := L + 1;
- end;
- end if;
- end Adjust;
-
- ------------
- -- Assign --
- ------------
-
- procedure Assign (Target : in out Map; Source : Map) is
- procedure Insert_Item (Node : Node_Access);
- pragma Inline (Insert_Item);
-
- procedure Insert_Items is
- new Tree_Operations.Generic_Iteration (Insert_Item);
-
- -----------------
- -- Insert_Item --
- -----------------
-
- procedure Insert_Item (Node : Node_Access) is
- begin
- Target.Insert (Key => Node.Key.all, New_Item => Node.Element.all);
- end Insert_Item;
-
- -- Start of processing for Assign
-
- begin
- if Target'Address = Source'Address then
- return;
- end if;
-
- Target.Clear;
- Insert_Items (Target.Tree);
- end Assign;
-
- -------------
- -- Ceiling --
- -------------
-
- function Ceiling (Container : Map; Key : Key_Type) return Cursor is
- Node : constant Node_Access := Key_Ops.Ceiling (Container.Tree, Key);
- begin
- return (if Node = null then No_Element
- else Cursor'(Container'Unrestricted_Access, Node));
- end Ceiling;
-
- -----------
- -- Clear --
- -----------
-
- procedure Clear is new Tree_Operations.Generic_Clear (Delete_Tree);
-
- procedure Clear (Container : in out Map) is
- begin
- Clear (Container.Tree);
- end Clear;
-
- -----------
- -- Color --
- -----------
-
- function Color (Node : Node_Access) return Color_Type is
- begin
- return Node.Color;
- end Color;
-
- ------------------------
- -- Constant_Reference --
- ------------------------
-
- function Constant_Reference
- (Container : aliased Map;
- Position : Cursor) return Constant_Reference_Type
- is
- begin
- if Position.Container = null then
- raise Constraint_Error with
- "Position cursor has no element";
- end if;
-
- if Position.Container /= Container'Unrestricted_Access then
- raise Program_Error with
- "Position cursor designates wrong map";
- end if;
-
- if Position.Node.Element = null then
- raise Program_Error with "Node has no element";
- end if;
-
- pragma Assert (Vet (Container.Tree, Position.Node),
- "Position cursor in Constant_Reference is bad");
-
- declare
- T : Tree_Type renames Container'Unrestricted_Access.all.Tree;
- B : Natural renames T.Busy;
- L : Natural renames T.Lock;
- begin
- return R : constant Constant_Reference_Type :=
- (Element => Position.Node.Element.all'Access,
- Control => (Controlled with Container'Unrestricted_Access))
- do
- B := B + 1;
- L := L + 1;
- end return;
- end;
- end Constant_Reference;
-
- function Constant_Reference
- (Container : aliased Map;
- Key : Key_Type) return Constant_Reference_Type
- is
- Node : constant Node_Access := Key_Ops.Find (Container.Tree, Key);
-
- begin
- if Node = null then
- raise Constraint_Error with "key not in map";
- end if;
-
- if Node.Element = null then
- raise Program_Error with "Node has no element";
- end if;
-
- declare
- T : Tree_Type renames Container'Unrestricted_Access.all.Tree;
- B : Natural renames T.Busy;
- L : Natural renames T.Lock;
- begin
- return R : constant Constant_Reference_Type :=
- (Element => Node.Element.all'Access,
- Control => (Controlled with Container'Unrestricted_Access))
- do
- B := B + 1;
- L := L + 1;
- end return;
- end;
- end Constant_Reference;
-
- --------------
- -- Contains --
- --------------
-
- function Contains (Container : Map; Key : Key_Type) return Boolean is
- begin
- return Find (Container, Key) /= No_Element;
- end Contains;
-
- ----------
- -- Copy --
- ----------
-
- function Copy (Source : Map) return Map is
- begin
- return Target : Map do
- Target.Assign (Source);
- end return;
- end Copy;
-
- ---------------
- -- Copy_Node --
- ---------------
-
- function Copy_Node (Source : Node_Access) return Node_Access is
- K : Key_Access := new Key_Type'(Source.Key.all);
- E : Element_Access;
-
- begin
- E := new Element_Type'(Source.Element.all);
-
- return new Node_Type'(Parent => null,
- Left => null,
- Right => null,
- Color => Source.Color,
- Key => K,
- Element => E);
- exception
- when others =>
- Free_Key (K);
- Free_Element (E);
- raise;
- end Copy_Node;
-
- ------------
- -- Delete --
- ------------
-
- procedure Delete
- (Container : in out Map;
- Position : in out Cursor)
- is
- begin
- if Position.Node = null then
- raise Constraint_Error with
- "Position cursor of Delete equals No_Element";
- end if;
-
- if Position.Node.Key = null
- or else Position.Node.Element = null
- then
- raise Program_Error with "Position cursor of Delete is bad";
- end if;
-
- if Position.Container /= Container'Unrestricted_Access then
- raise Program_Error with
- "Position cursor of Delete designates wrong map";
- end if;
-
- pragma Assert (Vet (Container.Tree, Position.Node),
- "Position cursor of Delete is bad");
-
- Tree_Operations.Delete_Node_Sans_Free (Container.Tree, Position.Node);
- Free (Position.Node);
-
- Position.Container := null;
- end Delete;
-
- procedure Delete (Container : in out Map; Key : Key_Type) is
- X : Node_Access := Key_Ops.Find (Container.Tree, Key);
-
- begin
- if X = null then
- raise Constraint_Error with "key not in map";
- end if;
-
- Delete_Node_Sans_Free (Container.Tree, X);
- Free (X);
- end Delete;
-
- ------------------
- -- Delete_First --
- ------------------
-
- procedure Delete_First (Container : in out Map) is
- X : Node_Access := Container.Tree.First;
- begin
- if X /= null then
- Tree_Operations.Delete_Node_Sans_Free (Container.Tree, X);
- Free (X);
- end if;
- end Delete_First;
-
- -----------------
- -- Delete_Last --
- -----------------
-
- procedure Delete_Last (Container : in out Map) is
- X : Node_Access := Container.Tree.Last;
- begin
- if X /= null then
- Tree_Operations.Delete_Node_Sans_Free (Container.Tree, X);
- Free (X);
- end if;
- end Delete_Last;
-
- -------------
- -- Element --
- -------------
-
- function Element (Position : Cursor) return Element_Type is
- begin
- if Position.Node = null then
- raise Constraint_Error with
- "Position cursor of function Element equals No_Element";
- end if;
-
- if Position.Node.Element = null then
- raise Program_Error with
- "Position cursor of function Element is bad";
- end if;
-
- pragma Assert (Vet (Position.Container.Tree, Position.Node),
- "Position cursor of function Element is bad");
-
- return Position.Node.Element.all;
- end Element;
-
- function Element (Container : Map; Key : Key_Type) return Element_Type is
- Node : constant Node_Access := Key_Ops.Find (Container.Tree, Key);
-
- begin
- if Node = null then
- raise Constraint_Error with "key not in map";
- end if;
-
- return Node.Element.all;
- end Element;
-
- ---------------------
- -- Equivalent_Keys --
- ---------------------
-
- function Equivalent_Keys (Left, Right : Key_Type) return Boolean is
- begin
- return (if Left < Right or else Right < Left then False else True);
- end Equivalent_Keys;
-
- -------------
- -- Exclude --
- -------------
-
- procedure Exclude (Container : in out Map; Key : Key_Type) is
- X : Node_Access := Key_Ops.Find (Container.Tree, Key);
- begin
- if X /= null then
- Tree_Operations.Delete_Node_Sans_Free (Container.Tree, X);
- Free (X);
- end if;
- end Exclude;
-
- --------------
- -- Finalize --
- --------------
-
- procedure Finalize (Object : in out Iterator) is
- begin
- if Object.Container /= null then
- declare
- B : Natural renames Object.Container.all.Tree.Busy;
- begin
- B := B - 1;
- end;
- end if;
- end Finalize;
-
- procedure Finalize (Control : in out Reference_Control_Type) is
- begin
- if Control.Container /= null then
- declare
- T : Tree_Type renames Control.Container.all.Tree;
- B : Natural renames T.Busy;
- L : Natural renames T.Lock;
- begin
- B := B - 1;
- L := L - 1;
- end;
-
- Control.Container := null;
- end if;
- end Finalize;
-
- ----------
- -- Find --
- ----------
-
- function Find (Container : Map; Key : Key_Type) return Cursor is
- Node : constant Node_Access := Key_Ops.Find (Container.Tree, Key);
- begin
- return (if Node = null then No_Element
- else Cursor'(Container'Unrestricted_Access, Node));
- end Find;
-
- -----------
- -- First --
- -----------
-
- function First (Container : Map) return Cursor is
- T : Tree_Type renames Container.Tree;
- begin
- return (if T.First = null then No_Element
- else Cursor'(Container'Unrestricted_Access, T.First));
- end First;
-
- function First (Object : Iterator) return Cursor is
- begin
- -- The value of the iterator object's Node component influences the
- -- behavior of the First (and Last) selector function.
-
- -- When the Node component is null, this means the iterator object was
- -- constructed without a start expression, in which case the (forward)
- -- iteration starts from the (logical) beginning of the entire sequence
- -- of items (corresponding to Container.First for a forward iterator).
-
- -- Otherwise, this is iteration over a partial sequence of items. When
- -- the Node component is non-null, the iterator object was constructed
- -- with a start expression, that specifies the position from which the
- -- (forward) partial iteration begins.
-
- if Object.Node = null then
- return Object.Container.First;
- else
- return Cursor'(Object.Container, Object.Node);
- end if;
- end First;
-
- -------------------
- -- First_Element --
- -------------------
-
- function First_Element (Container : Map) return Element_Type is
- T : Tree_Type renames Container.Tree;
- begin
- if T.First = null then
- raise Constraint_Error with "map is empty";
- else
- return T.First.Element.all;
- end if;
- end First_Element;
-
- ---------------
- -- First_Key --
- ---------------
-
- function First_Key (Container : Map) return Key_Type is
- T : Tree_Type renames Container.Tree;
- begin
- if T.First = null then
- raise Constraint_Error with "map is empty";
- else
- return T.First.Key.all;
- end if;
- end First_Key;
-
- -----------
- -- Floor --
- -----------
-
- function Floor (Container : Map; Key : Key_Type) return Cursor is
- Node : constant Node_Access := Key_Ops.Floor (Container.Tree, Key);
- begin
- return (if Node = null then No_Element
- else Cursor'(Container'Unrestricted_Access, Node));
- end Floor;
-
- ----------
- -- Free --
- ----------
-
- procedure Free (X : in out Node_Access) is
- procedure Deallocate is
- new Ada.Unchecked_Deallocation (Node_Type, Node_Access);
-
- begin
- if X = null then
- return;
- end if;
-
- X.Parent := X;
- X.Left := X;
- X.Right := X;
-
- begin
- Free_Key (X.Key);
-
- exception
- when others =>
- X.Key := null;
-
- begin
- Free_Element (X.Element);
- exception
- when others =>
- X.Element := null;
- end;
-
- Deallocate (X);
- raise;
- end;
-
- begin
- Free_Element (X.Element);
-
- exception
- when others =>
- X.Element := null;
-
- Deallocate (X);
- raise;
- end;
-
- Deallocate (X);
- end Free;
-
- -----------------
- -- Has_Element --
- -----------------
-
- function Has_Element (Position : Cursor) return Boolean is
- begin
- return Position /= No_Element;
- end Has_Element;
-
- -------------
- -- Include --
- -------------
-
- procedure Include
- (Container : in out Map;
- Key : Key_Type;
- New_Item : Element_Type)
- is
- Position : Cursor;
- Inserted : Boolean;
-
- K : Key_Access;
- E : Element_Access;
-
- begin
- Insert (Container, Key, New_Item, Position, Inserted);
-
- if not Inserted then
- if Container.Tree.Lock > 0 then
- raise Program_Error with
- "attempt to tamper with elements (map is locked)";
- end if;
-
- K := Position.Node.Key;
- E := Position.Node.Element;
-
- Position.Node.Key := new Key_Type'(Key);
-
- declare
- -- The element allocator may need an accessibility check in the
- -- case the actual type is class-wide or has access discriminants
- -- (see RM 4.8(10.1) and AI12-0035).
-
- pragma Unsuppress (Accessibility_Check);
-
- begin
- Position.Node.Element := new Element_Type'(New_Item);
-
- exception
- when others =>
- Free_Key (K);
- raise;
- end;
-
- Free_Key (K);
- Free_Element (E);
- end if;
- end Include;
-
- ------------
- -- Insert --
- ------------
-
- procedure Insert
- (Container : in out Map;
- Key : Key_Type;
- New_Item : Element_Type;
- Position : out Cursor;
- Inserted : out Boolean)
- is
- function New_Node return Node_Access;
- pragma Inline (New_Node);
-
- procedure Insert_Post is
- new Key_Ops.Generic_Insert_Post (New_Node);
-
- procedure Insert_Sans_Hint is
- new Key_Ops.Generic_Conditional_Insert (Insert_Post);
-
- --------------
- -- New_Node --
- --------------
-
- function New_Node return Node_Access is
- Node : Node_Access := new Node_Type;
-
- -- The element allocator may need an accessibility check in the case
- -- the actual type is class-wide or has access discriminants (see
- -- RM 4.8(10.1) and AI12-0035).
-
- pragma Unsuppress (Accessibility_Check);
-
- begin
- Node.Key := new Key_Type'(Key);
- Node.Element := new Element_Type'(New_Item);
- return Node;
-
- exception
- when others =>
-
- -- On exception, deallocate key and elem. Note that free
- -- deallocates both the key and the elem.
-
- Free (Node);
- raise;
- end New_Node;
-
- -- Start of processing for Insert
-
- begin
- Insert_Sans_Hint
- (Container.Tree,
- Key,
- Position.Node,
- Inserted);
-
- Position.Container := Container'Unrestricted_Access;
- end Insert;
-
- procedure Insert
- (Container : in out Map;
- Key : Key_Type;
- New_Item : Element_Type)
- is
- Position : Cursor;
- pragma Unreferenced (Position);
-
- Inserted : Boolean;
-
- begin
- Insert (Container, Key, New_Item, Position, Inserted);
-
- if not Inserted then
- raise Constraint_Error with "key already in map";
- end if;
- end Insert;
-
- --------------
- -- Is_Empty --
- --------------
-
- function Is_Empty (Container : Map) return Boolean is
- begin
- return Container.Tree.Length = 0;
- end Is_Empty;
-
- ------------------------
- -- Is_Equal_Node_Node --
- ------------------------
-
- function Is_Equal_Node_Node (L, R : Node_Access) return Boolean is
- begin
- return (if L.Key.all < R.Key.all then False
- elsif R.Key.all < L.Key.all then False
- else L.Element.all = R.Element.all);
- end Is_Equal_Node_Node;
-
- -------------------------
- -- Is_Greater_Key_Node --
- -------------------------
-
- function Is_Greater_Key_Node
- (Left : Key_Type;
- Right : Node_Access) return Boolean
- is
- begin
- -- k > node same as node < k
-
- return Right.Key.all < Left;
- end Is_Greater_Key_Node;
-
- ----------------------
- -- Is_Less_Key_Node --
- ----------------------
-
- function Is_Less_Key_Node
- (Left : Key_Type;
- Right : Node_Access) return Boolean is
- begin
- return Left < Right.Key.all;
- end Is_Less_Key_Node;
-
- -------------
- -- Iterate --
- -------------
-
- procedure Iterate
- (Container : Map;
- Process : not null access procedure (Position : Cursor))
- is
- procedure Process_Node (Node : Node_Access);
- pragma Inline (Process_Node);
-
- procedure Local_Iterate is
- new Tree_Operations.Generic_Iteration (Process_Node);
-
- ------------------
- -- Process_Node --
- ------------------
-
- procedure Process_Node (Node : Node_Access) is
- begin
- Process (Cursor'(Container'Unrestricted_Access, Node));
- end Process_Node;
-
- B : Natural renames Container'Unrestricted_Access.all.Tree.Busy;
-
- -- Start of processing for Iterate
-
- begin
- B := B + 1;
-
- begin
- Local_Iterate (Container.Tree);
- exception
- when others =>
- B := B - 1;
- raise;
- end;
-
- B := B - 1;
- end Iterate;
-
- function Iterate
- (Container : Map) return Map_Iterator_Interfaces.Reversible_Iterator'Class
- is
- B : Natural renames Container'Unrestricted_Access.all.Tree.Busy;
-
- begin
- -- The value of the Node component influences the behavior of the First
- -- and Last selector functions of the iterator object. When the Node
- -- component is null (as is the case here), this means the iterator
- -- object was constructed without a start expression. This is a complete
- -- iterator, meaning that the iteration starts from the (logical)
- -- beginning of the sequence of items.
-
- -- Note: For a forward iterator, Container.First is the beginning, and
- -- for a reverse iterator, Container.Last is the beginning.
-
- return It : constant Iterator :=
- (Limited_Controlled with
- Container => Container'Unrestricted_Access,
- Node => null)
- do
- B := B + 1;
- end return;
- end Iterate;
-
- function Iterate
- (Container : Map;
- Start : Cursor)
- return Map_Iterator_Interfaces.Reversible_Iterator'Class
- is
- B : Natural renames Container'Unrestricted_Access.all.Tree.Busy;
-
- begin
- -- It was formerly the case that when Start = No_Element, the partial
- -- iterator was defined to behave the same as for a complete iterator,
- -- and iterate over the entire sequence of items. However, those
- -- semantics were unintuitive and arguably error-prone (it is too easy
- -- to accidentally create an endless loop), and so they were changed,
- -- per the ARG meeting in Denver on 2011/11. However, there was no
- -- consensus about what positive meaning this corner case should have,
- -- and so it was decided to simply raise an exception. This does imply,
- -- however, that it is not possible to use a partial iterator to specify
- -- an empty sequence of items.
-
- if Start = No_Element then
- raise Constraint_Error with
- "Start position for iterator equals No_Element";
- end if;
-
- if Start.Container /= Container'Unrestricted_Access then
- raise Program_Error with
- "Start cursor of Iterate designates wrong map";
- end if;
-
- pragma Assert (Vet (Container.Tree, Start.Node),
- "Start cursor of Iterate is bad");
-
- -- The value of the Node component influences the behavior of the First
- -- and Last selector functions of the iterator object. When the Node
- -- component is non-null (as is the case here), it means that this
- -- is a partial iteration, over a subset of the complete sequence of
- -- items. The iterator object was constructed with a start expression,
- -- indicating the position from which the iteration begins. Note that
- -- the start position has the same value irrespective of whether this
- -- is a forward or reverse iteration.
-
- return It : constant Iterator :=
- (Limited_Controlled with
- Container => Container'Unrestricted_Access,
- Node => Start.Node)
- do
- B := B + 1;
- end return;
- end Iterate;
-
- ---------
- -- Key --
- ---------
-
- function Key (Position : Cursor) return Key_Type is
- begin
- if Position.Node = null then
- raise Constraint_Error with
- "Position cursor of function Key equals No_Element";
- end if;
-
- if Position.Node.Key = null then
- raise Program_Error with
- "Position cursor of function Key is bad";
- end if;
-
- pragma Assert (Vet (Position.Container.Tree, Position.Node),
- "Position cursor of function Key is bad");
-
- return Position.Node.Key.all;
- end Key;
-
- ----------
- -- Last --
- ----------
-
- function Last (Container : Map) return Cursor is
- T : Tree_Type renames Container.Tree;
- begin
- return (if T.Last = null then No_Element
- else Cursor'(Container'Unrestricted_Access, T.Last));
- end Last;
-
- function Last (Object : Iterator) return Cursor is
- begin
- -- The value of the iterator object's Node component influences the
- -- behavior of the Last (and First) selector function.
-
- -- When the Node component is null, this means the iterator object was
- -- constructed without a start expression, in which case the (reverse)
- -- iteration starts from the (logical) beginning of the entire sequence
- -- (corresponding to Container.Last, for a reverse iterator).
-
- -- Otherwise, this is iteration over a partial sequence of items. When
- -- the Node component is non-null, the iterator object was constructed
- -- with a start expression, that specifies the position from which the
- -- (reverse) partial iteration begins.
-
- if Object.Node = null then
- return Object.Container.Last;
- else
- return Cursor'(Object.Container, Object.Node);
- end if;
- end Last;
-
- ------------------
- -- Last_Element --
- ------------------
-
- function Last_Element (Container : Map) return Element_Type is
- T : Tree_Type renames Container.Tree;
-
- begin
- if T.Last = null then
- raise Constraint_Error with "map is empty";
- end if;
-
- return T.Last.Element.all;
- end Last_Element;
-
- --------------
- -- Last_Key --
- --------------
-
- function Last_Key (Container : Map) return Key_Type is
- T : Tree_Type renames Container.Tree;
-
- begin
- if T.Last = null then
- raise Constraint_Error with "map is empty";
- end if;
-
- return T.Last.Key.all;
- end Last_Key;
-
- ----------
- -- Left --
- ----------
-
- function Left (Node : Node_Access) return Node_Access is
- begin
- return Node.Left;
- end Left;
-
- ------------
- -- Length --
- ------------
-
- function Length (Container : Map) return Count_Type is
- begin
- return Container.Tree.Length;
- end Length;
-
- ----------
- -- Move --
- ----------
-
- procedure Move is new Tree_Operations.Generic_Move (Clear);
-
- procedure Move (Target : in out Map; Source : in out Map) is
- begin
- Move (Target => Target.Tree, Source => Source.Tree);
- end Move;
-
- ----------
- -- Next --
- ----------
-
- function Next (Position : Cursor) return Cursor is
- begin
- if Position = No_Element then
- return No_Element;
- end if;
-
- pragma Assert (Position.Node /= null);
- pragma Assert (Position.Node.Key /= null);
- pragma Assert (Position.Node.Element /= null);
- pragma Assert (Vet (Position.Container.Tree, Position.Node),
- "Position cursor of Next is bad");
-
- declare
- Node : constant Node_Access :=
- Tree_Operations.Next (Position.Node);
- begin
- return (if Node = null then No_Element
- else Cursor'(Position.Container, Node));
- end;
- end Next;
-
- procedure Next (Position : in out Cursor) is
- begin
- Position := Next (Position);
- end Next;
-
- function Next
- (Object : Iterator;
- Position : Cursor) return Cursor
- is
- begin
- if Position.Container = null then
- return No_Element;
- end if;
-
- if Position.Container /= Object.Container then
- raise Program_Error with
- "Position cursor of Next designates wrong map";
- end if;
-
- return Next (Position);
- end Next;
-
- ------------
- -- Parent --
- ------------
-
- function Parent (Node : Node_Access) return Node_Access is
- begin
- return Node.Parent;
- end Parent;
-
- --------------
- -- Previous --
- --------------
-
- function Previous (Position : Cursor) return Cursor is
- begin
- if Position = No_Element then
- return No_Element;
- end if;
-
- pragma Assert (Position.Node /= null);
- pragma Assert (Position.Node.Key /= null);
- pragma Assert (Position.Node.Element /= null);
- pragma Assert (Vet (Position.Container.Tree, Position.Node),
- "Position cursor of Previous is bad");
-
- declare
- Node : constant Node_Access :=
- Tree_Operations.Previous (Position.Node);
- begin
- return (if Node = null then No_Element
- else Cursor'(Position.Container, Node));
- end;
- end Previous;
-
- procedure Previous (Position : in out Cursor) is
- begin
- Position := Previous (Position);
- end Previous;
-
- function Previous
- (Object : Iterator;
- Position : Cursor) return Cursor
- is
- begin
- if Position.Container = null then
- return No_Element;
- end if;
-
- if Position.Container /= Object.Container then
- raise Program_Error with
- "Position cursor of Previous designates wrong map";
- end if;
-
- return Previous (Position);
- end Previous;
-
- -------------------
- -- Query_Element --
- -------------------
-
- procedure Query_Element
- (Position : Cursor;
- Process : not null access procedure (Key : Key_Type;
- Element : Element_Type))
- is
- begin
- if Position.Node = null then
- raise Constraint_Error with
- "Position cursor of Query_Element equals No_Element";
- end if;
-
- if Position.Node.Key = null
- or else Position.Node.Element = null
- then
- raise Program_Error with
- "Position cursor of Query_Element is bad";
- end if;
-
- pragma Assert (Vet (Position.Container.Tree, Position.Node),
- "Position cursor of Query_Element is bad");
-
- declare
- T : Tree_Type renames Position.Container.Tree;
-
- B : Natural renames T.Busy;
- L : Natural renames T.Lock;
-
- begin
- B := B + 1;
- L := L + 1;
-
- declare
- K : Key_Type renames Position.Node.Key.all;
- E : Element_Type renames Position.Node.Element.all;
-
- begin
- Process (K, E);
- exception
- when others =>
- L := L - 1;
- B := B - 1;
- raise;
- end;
-
- L := L - 1;
- B := B - 1;
- end;
- end Query_Element;
-
- ----------
- -- Read --
- ----------
-
- procedure Read
- (Stream : not null access Root_Stream_Type'Class;
- Container : out Map)
- is
- function Read_Node
- (Stream : not null access Root_Stream_Type'Class) return Node_Access;
- pragma Inline (Read_Node);
-
- procedure Read is
- new Tree_Operations.Generic_Read (Clear, Read_Node);
-
- ---------------
- -- Read_Node --
- ---------------
-
- function Read_Node
- (Stream : not null access Root_Stream_Type'Class) return Node_Access
- is
- Node : Node_Access := new Node_Type;
- begin
- Node.Key := new Key_Type'(Key_Type'Input (Stream));
- Node.Element := new Element_Type'(Element_Type'Input (Stream));
- return Node;
- exception
- when others =>
- Free (Node); -- Note that Free deallocates key and elem too
- raise;
- end Read_Node;
-
- -- Start of processing for Read
-
- begin
- Read (Stream, Container.Tree);
- end Read;
-
- procedure Read
- (Stream : not null access Root_Stream_Type'Class;
- Item : out Cursor)
- is
- begin
- raise Program_Error with "attempt to stream map cursor";
- end Read;
-
- procedure Read
- (Stream : not null access Root_Stream_Type'Class;
- Item : out Reference_Type)
- is
- begin
- raise Program_Error with "attempt to stream reference";
- end Read;
-
- procedure Read
- (Stream : not null access Root_Stream_Type'Class;
- Item : out Constant_Reference_Type)
- is
- begin
- raise Program_Error with "attempt to stream reference";
- end Read;
-
- ---------------
- -- Reference --
- ---------------
-
- function Reference
- (Container : aliased in out Map;
- Position : Cursor) return Reference_Type
- is
- begin
- if Position.Container = null then
- raise Constraint_Error with
- "Position cursor has no element";
- end if;
-
- if Position.Container /= Container'Unrestricted_Access then
- raise Program_Error with
- "Position cursor designates wrong map";
- end if;
-
- if Position.Node.Element = null then
- raise Program_Error with "Node has no element";
- end if;
-
- pragma Assert (Vet (Container.Tree, Position.Node),
- "Position cursor in function Reference is bad");
-
- declare
- T : Tree_Type renames Container'Unrestricted_Access.all.Tree;
- B : Natural renames T.Busy;
- L : Natural renames T.Lock;
- begin
- return R : constant Reference_Type :=
- (Element => Position.Node.Element.all'Access,
- Control => (Controlled with Position.Container))
- do
- B := B + 1;
- L := L + 1;
- end return;
- end;
- end Reference;
-
- function Reference
- (Container : aliased in out Map;
- Key : Key_Type) return Reference_Type
- is
- Node : constant Node_Access := Key_Ops.Find (Container.Tree, Key);
-
- begin
- if Node = null then
- raise Constraint_Error with "key not in map";
- end if;
-
- if Node.Element = null then
- raise Program_Error with "Node has no element";
- end if;
-
- declare
- T : Tree_Type renames Container'Unrestricted_Access.all.Tree;
- B : Natural renames T.Busy;
- L : Natural renames T.Lock;
- begin
- return R : constant Reference_Type :=
- (Element => Node.Element.all'Access,
- Control => (Controlled with Container'Unrestricted_Access))
- do
- B := B + 1;
- L := L + 1;
- end return;
- end;
- end Reference;
-
- -------------
- -- Replace --
- -------------
-
- procedure Replace
- (Container : in out Map;
- Key : Key_Type;
- New_Item : Element_Type)
- is
- Node : constant Node_Access := Key_Ops.Find (Container.Tree, Key);
-
- K : Key_Access;
- E : Element_Access;
-
- begin
- if Node = null then
- raise Constraint_Error with "key not in map";
- end if;
-
- if Container.Tree.Lock > 0 then
- raise Program_Error with
- "attempt to tamper with elements (map is locked)";
- end if;
-
- K := Node.Key;
- E := Node.Element;
-
- Node.Key := new Key_Type'(Key);
-
- declare
- -- The element allocator may need an accessibility check in the case
- -- the actual type is class-wide or has access discriminants (see
- -- RM 4.8(10.1) and AI12-0035).
-
- pragma Unsuppress (Accessibility_Check);
-
- begin
- Node.Element := new Element_Type'(New_Item);
-
- exception
- when others =>
- Free_Key (K);
- raise;
- end;
-
- Free_Key (K);
- Free_Element (E);
- end Replace;
-
- ---------------------
- -- Replace_Element --
- ---------------------
-
- procedure Replace_Element
- (Container : in out Map;
- Position : Cursor;
- New_Item : Element_Type)
- is
- begin
- if Position.Node = null then
- raise Constraint_Error with
- "Position cursor of Replace_Element equals No_Element";
- end if;
-
- if Position.Node.Key = null
- or else Position.Node.Element = null
- then
- raise Program_Error with
- "Position cursor of Replace_Element is bad";
- end if;
-
- if Position.Container /= Container'Unrestricted_Access then
- raise Program_Error with
- "Position cursor of Replace_Element designates wrong map";
- end if;
-
- if Container.Tree.Lock > 0 then
- raise Program_Error with
- "attempt to tamper with elements (map is locked)";
- end if;
-
- pragma Assert (Vet (Container.Tree, Position.Node),
- "Position cursor of Replace_Element is bad");
-
- declare
- X : Element_Access := Position.Node.Element;
-
- -- The element allocator may need an accessibility check in the case
- -- the actual type is class-wide or has access discriminants (see
- -- RM 4.8(10.1) and AI12-0035).
-
- pragma Unsuppress (Accessibility_Check);
-
- begin
- Position.Node.Element := new Element_Type'(New_Item);
- Free_Element (X);
- end;
- end Replace_Element;
-
- ---------------------
- -- Reverse_Iterate --
- ---------------------
-
- procedure Reverse_Iterate
- (Container : Map;
- Process : not null access procedure (Position : Cursor))
- is
- procedure Process_Node (Node : Node_Access);
- pragma Inline (Process_Node);
-
- procedure Local_Reverse_Iterate is
- new Tree_Operations.Generic_Reverse_Iteration (Process_Node);
-
- ------------------
- -- Process_Node --
- ------------------
-
- procedure Process_Node (Node : Node_Access) is
- begin
- Process (Cursor'(Container'Unrestricted_Access, Node));
- end Process_Node;
-
- B : Natural renames Container.Tree'Unrestricted_Access.all.Busy;
-
- -- Start of processing for Reverse_Iterate
-
- begin
- B := B + 1;
-
- begin
- Local_Reverse_Iterate (Container.Tree);
- exception
- when others =>
- B := B - 1;
- raise;
- end;
-
- B := B - 1;
- end Reverse_Iterate;
-
- -----------
- -- Right --
- -----------
-
- function Right (Node : Node_Access) return Node_Access is
- begin
- return Node.Right;
- end Right;
-
- ---------------
- -- Set_Color --
- ---------------
-
- procedure Set_Color (Node : Node_Access; Color : Color_Type) is
- begin
- Node.Color := Color;
- end Set_Color;
-
- --------------
- -- Set_Left --
- --------------
-
- procedure Set_Left (Node : Node_Access; Left : Node_Access) is
- begin
- Node.Left := Left;
- end Set_Left;
-
- ----------------
- -- Set_Parent --
- ----------------
-
- procedure Set_Parent (Node : Node_Access; Parent : Node_Access) is
- begin
- Node.Parent := Parent;
- end Set_Parent;
-
- ---------------
- -- Set_Right --
- ---------------
-
- procedure Set_Right (Node : Node_Access; Right : Node_Access) is
- begin
- Node.Right := Right;
- end Set_Right;
-
- --------------------
- -- Update_Element --
- --------------------
-
- procedure Update_Element
- (Container : in out Map;
- Position : Cursor;
- Process : not null access procedure (Key : Key_Type;
- Element : in out Element_Type))
- is
- begin
- if Position.Node = null then
- raise Constraint_Error with
- "Position cursor of Update_Element equals No_Element";
- end if;
-
- if Position.Node.Key = null
- or else Position.Node.Element = null
- then
- raise Program_Error with
- "Position cursor of Update_Element is bad";
- end if;
-
- if Position.Container /= Container'Unrestricted_Access then
- raise Program_Error with
- "Position cursor of Update_Element designates wrong map";
- end if;
-
- pragma Assert (Vet (Container.Tree, Position.Node),
- "Position cursor of Update_Element is bad");
-
- declare
- T : Tree_Type renames Position.Container.Tree;
-
- B : Natural renames T.Busy;
- L : Natural renames T.Lock;
-
- begin
- B := B + 1;
- L := L + 1;
-
- declare
- K : Key_Type renames Position.Node.Key.all;
- E : Element_Type renames Position.Node.Element.all;
-
- begin
- Process (K, E);
-
- exception
- when others =>
- L := L - 1;
- B := B - 1;
- raise;
- end;
-
- L := L - 1;
- B := B - 1;
- end;
- end Update_Element;
-
- -----------
- -- Write --
- -----------
-
- procedure Write
- (Stream : not null access Root_Stream_Type'Class;
- Container : Map)
- is
- procedure Write_Node
- (Stream : not null access Root_Stream_Type'Class;
- Node : Node_Access);
- pragma Inline (Write_Node);
-
- procedure Write is
- new Tree_Operations.Generic_Write (Write_Node);
-
- ----------------
- -- Write_Node --
- ----------------
-
- procedure Write_Node
- (Stream : not null access Root_Stream_Type'Class;
- Node : Node_Access)
- is
- begin
- Key_Type'Output (Stream, Node.Key.all);
- Element_Type'Output (Stream, Node.Element.all);
- end Write_Node;
-
- -- Start of processing for Write
-
- begin
- Write (Stream, Container.Tree);
- end Write;
-
- procedure Write
- (Stream : not null access Root_Stream_Type'Class;
- Item : Cursor)
- is
- begin
- raise Program_Error with "attempt to stream map cursor";
- end Write;
-
- procedure Write
- (Stream : not null access Root_Stream_Type'Class;
- Item : Reference_Type)
- is
- begin
- raise Program_Error with "attempt to stream reference";
- end Write;
-
- procedure Write
- (Stream : not null access Root_Stream_Type'Class;
- Item : Constant_Reference_Type)
- is
- begin
- raise Program_Error with "attempt to stream reference";
- end Write;
-
-end Ada.Containers.Indefinite_Ordered_Maps;