| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT LIBRARY COMPONENTS -- |
| -- -- |
| -- A D A . C O N T A I N E R S . B O U N D E D _ H A S H E D _ M A P S -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 2004-2014, 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.Containers.Hash_Tables.Generic_Bounded_Operations; |
| pragma Elaborate_All (Ada.Containers.Hash_Tables.Generic_Bounded_Operations); |
| |
| with Ada.Containers.Hash_Tables.Generic_Bounded_Keys; |
| pragma Elaborate_All (Ada.Containers.Hash_Tables.Generic_Bounded_Keys); |
| |
| with Ada.Containers.Prime_Numbers; use Ada.Containers.Prime_Numbers; |
| |
| with System; use type System.Address; |
| |
| package body Ada.Containers.Bounded_Hashed_Maps is |
| |
| pragma Annotate (CodePeer, Skip_Analysis); |
| |
| ----------------------- |
| -- Local Subprograms -- |
| ----------------------- |
| |
| function Equivalent_Key_Node |
| (Key : Key_Type; |
| Node : Node_Type) return Boolean; |
| pragma Inline (Equivalent_Key_Node); |
| |
| function Hash_Node (Node : Node_Type) return Hash_Type; |
| pragma Inline (Hash_Node); |
| |
| function Next (Node : Node_Type) return Count_Type; |
| pragma Inline (Next); |
| |
| procedure Set_Next (Node : in out Node_Type; Next : Count_Type); |
| pragma Inline (Set_Next); |
| |
| function Vet (Position : Cursor) return Boolean; |
| |
| -------------------------- |
| -- Local Instantiations -- |
| -------------------------- |
| |
| package HT_Ops is new Hash_Tables.Generic_Bounded_Operations |
| (HT_Types => HT_Types, |
| Hash_Node => Hash_Node, |
| Next => Next, |
| Set_Next => Set_Next); |
| |
| package Key_Ops is new Hash_Tables.Generic_Bounded_Keys |
| (HT_Types => HT_Types, |
| Next => Next, |
| Set_Next => Set_Next, |
| Key_Type => Key_Type, |
| Hash => Hash, |
| Equivalent_Keys => Equivalent_Key_Node); |
| |
| --------- |
| -- "=" -- |
| --------- |
| |
| function "=" (Left, Right : Map) return Boolean is |
| function Find_Equal_Key |
| (R_HT : Hash_Table_Type'Class; |
| L_Node : Node_Type) return Boolean; |
| |
| function Is_Equal is new HT_Ops.Generic_Equal (Find_Equal_Key); |
| |
| -------------------- |
| -- Find_Equal_Key -- |
| -------------------- |
| |
| function Find_Equal_Key |
| (R_HT : Hash_Table_Type'Class; |
| L_Node : Node_Type) return Boolean |
| is |
| R_Index : constant Hash_Type := Key_Ops.Index (R_HT, L_Node.Key); |
| R_Node : Count_Type := R_HT.Buckets (R_Index); |
| |
| begin |
| while R_Node /= 0 loop |
| if Equivalent_Keys (L_Node.Key, R_HT.Nodes (R_Node).Key) then |
| return L_Node.Element = R_HT.Nodes (R_Node).Element; |
| end if; |
| |
| R_Node := R_HT.Nodes (R_Node).Next; |
| end loop; |
| |
| return False; |
| end Find_Equal_Key; |
| |
| -- Start of processing for "=" |
| |
| begin |
| return Is_Equal (Left, Right); |
| end "="; |
| |
| ------------ |
| -- Adjust -- |
| ------------ |
| |
| procedure Adjust (Control : in out Reference_Control_Type) is |
| begin |
| if Control.Container /= null then |
| declare |
| C : Map renames Control.Container.all; |
| B : Natural renames C.Busy; |
| L : Natural renames C.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_Element (Source_Node : Count_Type); |
| |
| procedure Insert_Elements is |
| new HT_Ops.Generic_Iteration (Insert_Element); |
| |
| -------------------- |
| -- Insert_Element -- |
| -------------------- |
| |
| procedure Insert_Element (Source_Node : Count_Type) is |
| N : Node_Type renames Source.Nodes (Source_Node); |
| C : Cursor; |
| B : Boolean; |
| |
| begin |
| Insert (Target, N.Key, N.Element, C, B); |
| pragma Assert (B); |
| end Insert_Element; |
| |
| -- Start of processing for Assign |
| |
| begin |
| if Target'Address = Source'Address then |
| return; |
| end if; |
| |
| if Target.Capacity < Source.Length then |
| raise Capacity_Error |
| with "Target capacity is less than Source length"; |
| end if; |
| |
| HT_Ops.Clear (Target); |
| Insert_Elements (Source); |
| end Assign; |
| |
| -------------- |
| -- Capacity -- |
| -------------- |
| |
| function Capacity (Container : Map) return Count_Type is |
| begin |
| return Container.Capacity; |
| end Capacity; |
| |
| ----------- |
| -- Clear -- |
| ----------- |
| |
| procedure Clear (Container : in out Map) is |
| begin |
| HT_Ops.Clear (Container); |
| end Clear; |
| |
| ------------------------ |
| -- 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; |
| |
| pragma Assert (Vet (Position), |
| "Position cursor in Constant_Reference is bad"); |
| |
| declare |
| N : Node_Type renames Container.Nodes (Position.Node); |
| B : Natural renames Position.Container.Busy; |
| L : Natural renames Position.Container.Lock; |
| begin |
| return R : constant Constant_Reference_Type := |
| (Element => N.Element'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 Count_Type := |
| Key_Ops.Find (Container'Unrestricted_Access.all, Key); |
| |
| begin |
| if Node = 0 then |
| raise Constraint_Error with "key not in map"; |
| end if; |
| |
| declare |
| Cur : Cursor := Find (Container, Key); |
| pragma Unmodified (Cur); |
| |
| N : Node_Type renames Container.Nodes (Node); |
| B : Natural renames Cur.Container.Busy; |
| L : Natural renames Cur.Container.Lock; |
| |
| begin |
| return R : constant Constant_Reference_Type := |
| (Element => N.Element'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; |
| Capacity : Count_Type := 0; |
| Modulus : Hash_Type := 0) return Map |
| is |
| C : Count_Type; |
| M : Hash_Type; |
| |
| begin |
| if Capacity = 0 then |
| C := Source.Length; |
| |
| elsif Capacity >= Source.Length then |
| C := Capacity; |
| |
| else |
| raise Capacity_Error with "Capacity value too small"; |
| end if; |
| |
| if Modulus = 0 then |
| M := Default_Modulus (C); |
| else |
| M := Modulus; |
| end if; |
| |
| return Target : Map (Capacity => C, Modulus => M) do |
| Assign (Target => Target, Source => Source); |
| end return; |
| end Copy; |
| |
| --------------------- |
| -- Default_Modulus -- |
| --------------------- |
| |
| function Default_Modulus (Capacity : Count_Type) return Hash_Type is |
| begin |
| return To_Prime (Capacity); |
| end Default_Modulus; |
| |
| ------------ |
| -- Delete -- |
| ------------ |
| |
| procedure Delete (Container : in out Map; Key : Key_Type) is |
| X : Count_Type; |
| |
| begin |
| Key_Ops.Delete_Key_Sans_Free (Container, Key, X); |
| |
| if X = 0 then |
| raise Constraint_Error with "attempt to delete key not in map"; |
| end if; |
| |
| HT_Ops.Free (Container, X); |
| end Delete; |
| |
| procedure Delete (Container : in out Map; Position : in out Cursor) is |
| begin |
| if Position.Node = 0 then |
| raise Constraint_Error with |
| "Position cursor of Delete equals No_Element"; |
| end if; |
| |
| if Position.Container /= Container'Unrestricted_Access then |
| raise Program_Error with |
| "Position cursor of Delete designates wrong map"; |
| end if; |
| |
| if Container.Busy > 0 then |
| raise Program_Error with |
| "Delete attempted to tamper with cursors (map is busy)"; |
| end if; |
| |
| pragma Assert (Vet (Position), "bad cursor in Delete"); |
| |
| HT_Ops.Delete_Node_Sans_Free (Container, Position.Node); |
| HT_Ops.Free (Container, Position.Node); |
| |
| Position := No_Element; |
| end Delete; |
| |
| ------------- |
| -- Element -- |
| ------------- |
| |
| function Element (Container : Map; Key : Key_Type) return Element_Type is |
| Node : constant Count_Type := |
| Key_Ops.Find (Container'Unrestricted_Access.all, Key); |
| |
| begin |
| if Node = 0 then |
| raise Constraint_Error with |
| "no element available because key not in map"; |
| end if; |
| |
| return Container.Nodes (Node).Element; |
| end Element; |
| |
| function Element (Position : Cursor) return Element_Type is |
| begin |
| if Position.Node = 0 then |
| raise Constraint_Error with |
| "Position cursor of function Element equals No_Element"; |
| end if; |
| |
| pragma Assert (Vet (Position), "bad cursor in function Element"); |
| |
| return Position.Container.Nodes (Position.Node).Element; |
| end Element; |
| |
| ------------------------- |
| -- Equivalent_Key_Node -- |
| ------------------------- |
| |
| function Equivalent_Key_Node |
| (Key : Key_Type; |
| Node : Node_Type) return Boolean is |
| begin |
| return Equivalent_Keys (Key, Node.Key); |
| end Equivalent_Key_Node; |
| |
| --------------------- |
| -- Equivalent_Keys -- |
| --------------------- |
| |
| function Equivalent_Keys (Left, Right : Cursor) |
| return Boolean is |
| begin |
| if Left.Node = 0 then |
| raise Constraint_Error with |
| "Left cursor of Equivalent_Keys equals No_Element"; |
| end if; |
| |
| if Right.Node = 0 then |
| raise Constraint_Error with |
| "Right cursor of Equivalent_Keys equals No_Element"; |
| end if; |
| |
| pragma Assert (Vet (Left), "Left cursor of Equivalent_Keys is bad"); |
| pragma Assert (Vet (Right), "Right cursor of Equivalent_Keys is bad"); |
| |
| declare |
| LN : Node_Type renames Left.Container.Nodes (Left.Node); |
| RN : Node_Type renames Right.Container.Nodes (Right.Node); |
| |
| begin |
| return Equivalent_Keys (LN.Key, RN.Key); |
| end; |
| end Equivalent_Keys; |
| |
| function Equivalent_Keys (Left : Cursor; Right : Key_Type) return Boolean is |
| begin |
| if Left.Node = 0 then |
| raise Constraint_Error with |
| "Left cursor of Equivalent_Keys equals No_Element"; |
| end if; |
| |
| pragma Assert (Vet (Left), "Left cursor in Equivalent_Keys is bad"); |
| |
| declare |
| LN : Node_Type renames Left.Container.Nodes (Left.Node); |
| |
| begin |
| return Equivalent_Keys (LN.Key, Right); |
| end; |
| end Equivalent_Keys; |
| |
| function Equivalent_Keys (Left : Key_Type; Right : Cursor) return Boolean is |
| begin |
| if Right.Node = 0 then |
| raise Constraint_Error with |
| "Right cursor of Equivalent_Keys equals No_Element"; |
| end if; |
| |
| pragma Assert (Vet (Right), "Right cursor of Equivalent_Keys is bad"); |
| |
| declare |
| RN : Node_Type renames Right.Container.Nodes (Right.Node); |
| |
| begin |
| return Equivalent_Keys (Left, RN.Key); |
| end; |
| end Equivalent_Keys; |
| |
| ------------- |
| -- Exclude -- |
| ------------- |
| |
| procedure Exclude (Container : in out Map; Key : Key_Type) is |
| X : Count_Type; |
| begin |
| Key_Ops.Delete_Key_Sans_Free (Container, Key, X); |
| HT_Ops.Free (Container, X); |
| end Exclude; |
| |
| -------------- |
| -- Finalize -- |
| -------------- |
| |
| procedure Finalize (Object : in out Iterator) is |
| begin |
| if Object.Container /= null then |
| declare |
| B : Natural renames Object.Container.all.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 |
| C : Map renames Control.Container.all; |
| B : Natural renames C.Busy; |
| L : Natural renames C.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 Count_Type := |
| Key_Ops.Find (Container'Unrestricted_Access.all, Key); |
| begin |
| if Node = 0 then |
| return No_Element; |
| else |
| return Cursor'(Container'Unrestricted_Access, Node); |
| end if; |
| end Find; |
| |
| ----------- |
| -- First -- |
| ----------- |
| |
| function First (Container : Map) return Cursor is |
| Node : constant Count_Type := HT_Ops.First (Container); |
| begin |
| if Node = 0 then |
| return No_Element; |
| else |
| return Cursor'(Container'Unrestricted_Access, Node); |
| end if; |
| end First; |
| |
| function First (Object : Iterator) return Cursor is |
| begin |
| return Object.Container.First; |
| end First; |
| |
| ----------------- |
| -- Has_Element -- |
| ----------------- |
| |
| function Has_Element (Position : Cursor) return Boolean is |
| begin |
| pragma Assert (Vet (Position), "bad cursor in Has_Element"); |
| return Position.Node /= 0; |
| end Has_Element; |
| |
| --------------- |
| -- Hash_Node -- |
| --------------- |
| |
| function Hash_Node (Node : Node_Type) return Hash_Type is |
| begin |
| return Hash (Node.Key); |
| end Hash_Node; |
| |
| ------------- |
| -- Include -- |
| ------------- |
| |
| procedure Include |
| (Container : in out Map; |
| Key : Key_Type; |
| New_Item : Element_Type) |
| is |
| Position : Cursor; |
| Inserted : Boolean; |
| |
| begin |
| Insert (Container, Key, New_Item, Position, Inserted); |
| |
| if not Inserted then |
| if Container.Lock > 0 then |
| raise Program_Error with |
| "Include attempted to tamper with elements (map is locked)"; |
| end if; |
| |
| declare |
| N : Node_Type renames Container.Nodes (Position.Node); |
| begin |
| N.Key := Key; |
| N.Element := New_Item; |
| end; |
| end if; |
| end Include; |
| |
| ------------ |
| -- Insert -- |
| ------------ |
| |
| procedure Insert |
| (Container : in out Map; |
| Key : Key_Type; |
| Position : out Cursor; |
| Inserted : out Boolean) |
| is |
| procedure Assign_Key (Node : in out Node_Type); |
| pragma Inline (Assign_Key); |
| |
| function New_Node return Count_Type; |
| pragma Inline (New_Node); |
| |
| procedure Local_Insert is |
| new Key_Ops.Generic_Conditional_Insert (New_Node); |
| |
| procedure Allocate is |
| new HT_Ops.Generic_Allocate (Assign_Key); |
| |
| ----------------- |
| -- Assign_Key -- |
| ----------------- |
| |
| procedure Assign_Key (Node : in out Node_Type) is |
| New_Item : Element_Type; |
| pragma Unmodified (New_Item); |
| -- Default-initialized element (ok to reference, see below) |
| |
| begin |
| Node.Key := Key; |
| |
| -- There is no explicit element provided, but in an instance the |
| -- element type may be a scalar with a Default_Value aspect, or a |
| -- composite type with such a scalar component, or components with |
| -- default initialization, so insert a possibly initialized element |
| -- under the given key. |
| |
| Node.Element := New_Item; |
| end Assign_Key; |
| |
| -------------- |
| -- New_Node -- |
| -------------- |
| |
| function New_Node return Count_Type is |
| Result : Count_Type; |
| begin |
| Allocate (Container, Result); |
| return Result; |
| end New_Node; |
| |
| -- Start of processing for Insert |
| |
| begin |
| -- The buckets array length is specified by the user as a discriminant |
| -- of the container type, so it is possible for the buckets array to |
| -- have a length of zero. We must check for this case specifically, in |
| -- order to prevent divide-by-zero errors later, when we compute the |
| -- buckets array index value for a key, given its hash value. |
| |
| if Container.Buckets'Length = 0 then |
| raise Capacity_Error with "No capacity for insertion"; |
| end if; |
| |
| Local_Insert (Container, Key, Position.Node, Inserted); |
| Position.Container := Container'Unchecked_Access; |
| end Insert; |
| |
| procedure Insert |
| (Container : in out Map; |
| Key : Key_Type; |
| New_Item : Element_Type; |
| Position : out Cursor; |
| Inserted : out Boolean) |
| is |
| procedure Assign_Key (Node : in out Node_Type); |
| pragma Inline (Assign_Key); |
| |
| function New_Node return Count_Type; |
| pragma Inline (New_Node); |
| |
| procedure Local_Insert is |
| new Key_Ops.Generic_Conditional_Insert (New_Node); |
| |
| procedure Allocate is |
| new HT_Ops.Generic_Allocate (Assign_Key); |
| |
| ----------------- |
| -- Assign_Key -- |
| ----------------- |
| |
| procedure Assign_Key (Node : in out Node_Type) is |
| begin |
| Node.Key := Key; |
| Node.Element := New_Item; |
| end Assign_Key; |
| |
| -------------- |
| -- New_Node -- |
| -------------- |
| |
| function New_Node return Count_Type is |
| Result : Count_Type; |
| begin |
| Allocate (Container, Result); |
| return Result; |
| end New_Node; |
| |
| -- Start of processing for Insert |
| |
| begin |
| -- The buckets array length is specified by the user as a discriminant |
| -- of the container type, so it is possible for the buckets array to |
| -- have a length of zero. We must check for this case specifically, in |
| -- order to prevent divide-by-zero errors later, when we compute the |
| -- buckets array index value for a key, given its hash value. |
| |
| if Container.Buckets'Length = 0 then |
| raise Capacity_Error with "No capacity for insertion"; |
| end if; |
| |
| Local_Insert (Container, Key, Position.Node, Inserted); |
| Position.Container := Container'Unchecked_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 |
| "attempt to insert key already in map"; |
| end if; |
| end Insert; |
| |
| -------------- |
| -- Is_Empty -- |
| -------------- |
| |
| function Is_Empty (Container : Map) return Boolean is |
| begin |
| return Container.Length = 0; |
| end Is_Empty; |
| |
| ------------- |
| -- Iterate -- |
| ------------- |
| |
| procedure Iterate |
| (Container : Map; |
| Process : not null access procedure (Position : Cursor)) |
| is |
| procedure Process_Node (Node : Count_Type); |
| pragma Inline (Process_Node); |
| |
| procedure Local_Iterate is new HT_Ops.Generic_Iteration (Process_Node); |
| |
| ------------------ |
| -- Process_Node -- |
| ------------------ |
| |
| procedure Process_Node (Node : Count_Type) is |
| begin |
| Process (Cursor'(Container'Unrestricted_Access, Node)); |
| end Process_Node; |
| |
| B : Natural renames Container'Unrestricted_Access.all.Busy; |
| |
| -- Start of processing for Iterate |
| |
| begin |
| B := B + 1; |
| |
| begin |
| Local_Iterate (Container); |
| exception |
| when others => |
| B := B - 1; |
| raise; |
| end; |
| |
| B := B - 1; |
| end Iterate; |
| |
| function Iterate |
| (Container : Map) return Map_Iterator_Interfaces.Forward_Iterator'Class |
| is |
| B : Natural renames Container'Unrestricted_Access.all.Busy; |
| |
| begin |
| return It : constant Iterator := |
| (Limited_Controlled with |
| Container => Container'Unrestricted_Access) |
| do |
| B := B + 1; |
| end return; |
| end Iterate; |
| |
| --------- |
| -- Key -- |
| --------- |
| |
| function Key (Position : Cursor) return Key_Type is |
| begin |
| if Position.Node = 0 then |
| raise Constraint_Error with |
| "Position cursor of function Key equals No_Element"; |
| end if; |
| |
| pragma Assert (Vet (Position), "bad cursor in function Key"); |
| |
| return Position.Container.Nodes (Position.Node).Key; |
| end Key; |
| |
| ------------ |
| -- Length -- |
| ------------ |
| |
| function Length (Container : Map) return Count_Type is |
| begin |
| return Container.Length; |
| end Length; |
| |
| ---------- |
| -- Move -- |
| ---------- |
| |
| procedure Move |
| (Target : in out Map; |
| Source : in out Map) |
| is |
| begin |
| if Target'Address = Source'Address then |
| return; |
| end if; |
| |
| if Source.Busy > 0 then |
| raise Program_Error with |
| "attempt to tamper with cursors (container is busy)"; |
| end if; |
| |
| Target.Assign (Source); |
| Source.Clear; |
| end Move; |
| |
| ---------- |
| -- Next -- |
| ---------- |
| |
| function Next (Node : Node_Type) return Count_Type is |
| begin |
| return Node.Next; |
| end Next; |
| |
| function Next (Position : Cursor) return Cursor is |
| begin |
| if Position.Node = 0 then |
| return No_Element; |
| end if; |
| |
| pragma Assert (Vet (Position), "bad cursor in function Next"); |
| |
| declare |
| M : Map renames Position.Container.all; |
| Node : constant Count_Type := HT_Ops.Next (M, Position.Node); |
| begin |
| if Node = 0 then |
| return No_Element; |
| else |
| return Cursor'(Position.Container, Node); |
| end if; |
| 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; |
| |
| ------------------- |
| -- Query_Element -- |
| ------------------- |
| |
| procedure Query_Element |
| (Position : Cursor; |
| Process : not null access |
| procedure (Key : Key_Type; Element : Element_Type)) |
| is |
| begin |
| if Position.Node = 0 then |
| raise Constraint_Error with |
| "Position cursor of Query_Element equals No_Element"; |
| end if; |
| |
| pragma Assert (Vet (Position), "bad cursor in Query_Element"); |
| |
| declare |
| M : Map renames Position.Container.all; |
| N : Node_Type renames M.Nodes (Position.Node); |
| B : Natural renames M.Busy; |
| L : Natural renames M.Lock; |
| |
| begin |
| B := B + 1; |
| L := L + 1; |
| |
| declare |
| |
| begin |
| Process (N.Key, N.Element); |
| 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 Count_Type; |
| -- pragma Inline (Read_Node); ??? |
| |
| procedure Read_Nodes is new HT_Ops.Generic_Read (Read_Node); |
| |
| --------------- |
| -- Read_Node -- |
| --------------- |
| |
| function Read_Node |
| (Stream : not null access Root_Stream_Type'Class) return Count_Type |
| is |
| procedure Read_Element (Node : in out Node_Type); |
| -- pragma Inline (Read_Element); ??? |
| |
| procedure Allocate is |
| new HT_Ops.Generic_Allocate (Read_Element); |
| |
| procedure Read_Element (Node : in out Node_Type) is |
| begin |
| Key_Type'Read (Stream, Node.Key); |
| Element_Type'Read (Stream, Node.Element); |
| end Read_Element; |
| |
| Node : Count_Type; |
| |
| -- Start of processing for Read_Node |
| |
| begin |
| Allocate (Container, Node); |
| return Node; |
| end Read_Node; |
| |
| -- Start of processing for Read |
| |
| begin |
| Read_Nodes (Stream, Container); |
| 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; |
| |
| pragma Assert (Vet (Position), |
| "Position cursor in function Reference is bad"); |
| |
| declare |
| N : Node_Type renames Container.Nodes (Position.Node); |
| B : Natural renames Container.Busy; |
| L : Natural renames Container.Lock; |
| |
| begin |
| return R : constant Reference_Type := |
| (Element => N.Element'Access, |
| Control => (Controlled with Container'Unrestricted_Access)) |
| 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 Count_Type := Key_Ops.Find (Container, Key); |
| |
| begin |
| if Node = 0 then |
| raise Constraint_Error with "key not in map"; |
| end if; |
| |
| declare |
| N : Node_Type renames Container.Nodes (Node); |
| B : Natural renames Container.Busy; |
| L : Natural renames Container.Lock; |
| |
| begin |
| return R : constant Reference_Type := |
| (Element => N.Element'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 Count_Type := Key_Ops.Find (Container, Key); |
| |
| begin |
| if Node = 0 then |
| raise Constraint_Error with |
| "attempt to replace key not in map"; |
| end if; |
| |
| if Container.Lock > 0 then |
| raise Program_Error with |
| "Replace attempted to tamper with elements (map is locked)"; |
| end if; |
| |
| declare |
| N : Node_Type renames Container.Nodes (Node); |
| |
| begin |
| N.Key := Key; |
| N.Element := New_Item; |
| end; |
| end Replace; |
| |
| --------------------- |
| -- Replace_Element -- |
| --------------------- |
| |
| procedure Replace_Element |
| (Container : in out Map; |
| Position : Cursor; |
| New_Item : Element_Type) |
| is |
| begin |
| if Position.Node = 0 then |
| raise Constraint_Error with |
| "Position cursor of Replace_Element equals No_Element"; |
| end if; |
| |
| if Position.Container /= Container'Unrestricted_Access then |
| raise Program_Error with |
| "Position cursor of Replace_Element designates wrong map"; |
| end if; |
| |
| if Position.Container.Lock > 0 then |
| raise Program_Error with |
| "Replace_Element attempted to tamper with elements (map is locked)"; |
| end if; |
| |
| pragma Assert (Vet (Position), "bad cursor in Replace_Element"); |
| |
| Container.Nodes (Position.Node).Element := New_Item; |
| end Replace_Element; |
| |
| ---------------------- |
| -- Reserve_Capacity -- |
| ---------------------- |
| |
| procedure Reserve_Capacity |
| (Container : in out Map; |
| Capacity : Count_Type) |
| is |
| begin |
| if Capacity > Container.Capacity then |
| raise Capacity_Error with "requested capacity is too large"; |
| end if; |
| end Reserve_Capacity; |
| |
| -------------- |
| -- Set_Next -- |
| -------------- |
| |
| procedure Set_Next (Node : in out Node_Type; Next : Count_Type) is |
| begin |
| Node.Next := Next; |
| end Set_Next; |
| |
| -------------------- |
| -- 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 = 0 then |
| raise Constraint_Error with |
| "Position cursor of Update_Element equals No_Element"; |
| 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 (Position), "bad cursor in Update_Element"); |
| |
| declare |
| N : Node_Type renames Container.Nodes (Position.Node); |
| B : Natural renames Container.Busy; |
| L : Natural renames Container.Lock; |
| |
| begin |
| B := B + 1; |
| L := L + 1; |
| |
| begin |
| Process (N.Key, N.Element); |
| exception |
| when others => |
| L := L - 1; |
| B := B - 1; |
| raise; |
| end; |
| |
| L := L - 1; |
| B := B - 1; |
| end; |
| end Update_Element; |
| |
| --------- |
| -- Vet -- |
| --------- |
| |
| function Vet (Position : Cursor) return Boolean is |
| begin |
| if Position.Node = 0 then |
| return Position.Container = null; |
| end if; |
| |
| if Position.Container = null then |
| return False; |
| end if; |
| |
| declare |
| M : Map renames Position.Container.all; |
| X : Count_Type; |
| |
| begin |
| if M.Length = 0 then |
| return False; |
| end if; |
| |
| if M.Capacity = 0 then |
| return False; |
| end if; |
| |
| if M.Buckets'Length = 0 then |
| return False; |
| end if; |
| |
| if Position.Node > M.Capacity then |
| return False; |
| end if; |
| |
| if M.Nodes (Position.Node).Next = Position.Node then |
| return False; |
| end if; |
| |
| X := M.Buckets (Key_Ops.Checked_Index |
| (M, M.Nodes (Position.Node).Key)); |
| |
| for J in 1 .. M.Length loop |
| if X = Position.Node then |
| return True; |
| end if; |
| |
| if X = 0 then |
| return False; |
| end if; |
| |
| if X = M.Nodes (X).Next then -- to prevent unnecessary looping |
| return False; |
| end if; |
| |
| X := M.Nodes (X).Next; |
| end loop; |
| |
| return False; |
| end; |
| end Vet; |
| |
| ----------- |
| -- 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_Type); |
| pragma Inline (Write_Node); |
| |
| procedure Write_Nodes is new HT_Ops.Generic_Write (Write_Node); |
| |
| ---------------- |
| -- Write_Node -- |
| ---------------- |
| |
| procedure Write_Node |
| (Stream : not null access Root_Stream_Type'Class; |
| Node : Node_Type) |
| is |
| begin |
| Key_Type'Write (Stream, Node.Key); |
| Element_Type'Write (Stream, Node.Element); |
| end Write_Node; |
| |
| -- Start of processing for Write |
| |
| begin |
| Write_Nodes (Stream, Container); |
| 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.Bounded_Hashed_Maps; |
