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------------------------------------------------------------------------------ -- -- -- GNAT LIBRARY COMPONENTS -- -- -- -- A D A . C O N T A I N E R S . F O R M A L _ H A S H E D _ M A P S -- -- -- -- B o d y -- -- -- -- Copyright (C) 2010-2011, 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/>. -- ------------------------------------------------------------------------------ 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.Formal_Hashed_Maps is ----------------------- -- Local Subprograms -- ----------------------- -- All local subprograms require comments ??? function Equivalent_Keys (Key : Key_Type; Node : Node_Type) return Boolean; pragma Inline (Equivalent_Keys); procedure Free (HT : in out Map; X : Count_Type); generic with procedure Set_Element (Node : in out Node_Type); procedure Generic_Allocate (HT : in out Map; Node : out Count_Type); 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 (Container : Map; 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_Keys); --------- -- "=" -- --------- function "=" (Left, Right : Map) return Boolean is begin if Length (Left) /= Length (Right) then return False; end if; if Length (Left) = 0 then return True; end if; declare Node : Count_Type; ENode : Count_Type; begin Node := Left.First.Node; while Node /= 0 loop ENode := Find (Container => Right, Key => Left.Nodes (Node).Key).Node; if ENode = 0 or else Right.Nodes (ENode).Element /= Left.Nodes (Node).Element then return False; end if; Node := HT_Ops.Next (Left, Node); end loop; return True; end; end "="; ------------ -- Assign -- ------------ procedure Assign (Target : in out Map; Source : Map) is procedure Insert_Element (Source_Node : Count_Type); pragma Inline (Insert_Element); 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); begin Target.Insert (N.Key, N.Element); end Insert_Element; -- Start of processing for Assign begin if Target'Address = Source'Address then return; end if; if Target.Capacity < Length (Source) then raise Constraint_Error with -- correct exception ??? "Source length exceeds Target capacity"; end if; -- Check busy bits Clear (Target); Insert_Elements (Source); end Assign; -------------- -- Capacity -- -------------- function Capacity (Container : Map) return Count_Type is begin return Container.Nodes'Length; end Capacity; ----------- -- Clear -- ----------- procedure Clear (Container : in out Map) is begin HT_Ops.Clear (Container); end Clear; -------------- -- 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) return Map is C : constant Count_Type := Count_Type'Max (Capacity, Source.Capacity); H : Hash_Type; N : Count_Type; Target : Map (C, Source.Modulus); Cu : Cursor; begin Target.Length := Source.Length; Target.Free := Source.Free; H := 1; while H <= Source.Modulus loop Target.Buckets (H) := Source.Buckets (H); H := H + 1; end loop; N := 1; while N <= Source.Capacity loop Target.Nodes (N) := Source.Nodes (N); N := N + 1; end loop; while N <= C loop Cu := (Node => N); Free (Target, Cu.Node); N := N + 1; end loop; return Target; 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; Free (Container, X); end Delete; procedure Delete (Container : in out Map; Position : in out Cursor) is begin if not Has_Element (Container, Position) then raise Constraint_Error with "Position cursor of Delete has no element"; end if; if Container.Busy > 0 then raise Program_Error with "Delete attempted to tamper with elements (map is busy)"; end if; pragma Assert (Vet (Container, Position), "bad cursor in Delete"); HT_Ops.Delete_Node_Sans_Free (Container, Position.Node); Free (Container, Position.Node); end Delete; ------------- -- Element -- ------------- function Element (Container : Map; Key : Key_Type) return Element_Type is Node : constant Count_Type := Find (Container, Key).Node; 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 (Container : Map; Position : Cursor) return Element_Type is begin if not Has_Element (Container, Position) then raise Constraint_Error with "Position cursor equals No_Element"; end if; pragma Assert (Vet (Container, Position), "bad cursor in function Element"); return Container.Nodes (Position.Node).Element; end Element; --------------------- -- Equivalent_Keys -- --------------------- function Equivalent_Keys (Key : Key_Type; Node : Node_Type) return Boolean is begin return Equivalent_Keys (Key, Node.Key); end Equivalent_Keys; function Equivalent_Keys (Left : Map; CLeft : Cursor; Right : Map; CRight : Cursor) return Boolean is begin if not Has_Element (Left, CLeft) then raise Constraint_Error with "Left cursor of Equivalent_Keys has no element"; end if; if not Has_Element (Right, CRight) then raise Constraint_Error with "Right cursor of Equivalent_Keys has no element"; end if; pragma Assert (Vet (Left, CLeft), "Left cursor of Equivalent_Keys is bad"); pragma Assert (Vet (Right, CRight), "Right cursor of Equivalent_Keys is bad"); declare LN : Node_Type renames Left.Nodes (CLeft.Node); RN : Node_Type renames Right.Nodes (CRight.Node); begin return Equivalent_Keys (LN.Key, RN.Key); end; end Equivalent_Keys; function Equivalent_Keys (Left : Map; CLeft : Cursor; Right : Key_Type) return Boolean is begin if not Has_Element (Left, CLeft) then raise Constraint_Error with "Left cursor of Equivalent_Keys has no element"; end if; pragma Assert (Vet (Left, CLeft), "Left cursor in Equivalent_Keys is bad"); declare LN : Node_Type renames Left.Nodes (CLeft.Node); begin return Equivalent_Keys (LN.Key, Right); end; end Equivalent_Keys; function Equivalent_Keys (Left : Key_Type; Right : Map; CRight : Cursor) return Boolean is begin if Has_Element (Right, CRight) then raise Constraint_Error with "Right cursor of Equivalent_Keys has no element"; end if; pragma Assert (Vet (Right, CRight), "Right cursor of Equivalent_Keys is bad"); declare RN : Node_Type renames Right.Nodes (CRight.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); Free (Container, X); end Exclude; ---------- -- Find -- ---------- function Find (Container : Map; Key : Key_Type) return Cursor is Node : constant Count_Type := Key_Ops.Find (Container, Key); begin if Node = 0 then return No_Element; end if; return (Node => Node); 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; end if; return (Node => Node); end First; ---------- -- Free -- ---------- procedure Free (HT : in out Map; X : Count_Type) is begin HT.Nodes (X).Has_Element := False; HT_Ops.Free (HT, X); end Free; ---------------------- -- Generic_Allocate -- ---------------------- procedure Generic_Allocate (HT : in out Map; Node : out Count_Type) is procedure Allocate is new HT_Ops.Generic_Allocate (Set_Element); begin Allocate (HT, Node); HT.Nodes (Node).Has_Element := True; end Generic_Allocate; ----------------- -- Has_Element -- ----------------- function Has_Element (Container : Map; Position : Cursor) return Boolean is begin if Position.Node = 0 or else not Container.Nodes (Position.Node).Has_Element then return False; end if; return True; 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 cursors (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 Generic_Allocate (Assign_Key); ----------------- -- Assign_Key -- ----------------- procedure Assign_Key (Node : in out Node_Type) is begin Node.Key := Key; -- What is following commented out line doing here ??? -- 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 Local_Insert (Container, Key, Position.Node, Inserted); 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 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 Local_Insert (Container, Key, Position.Node, Inserted); 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 Length (Container) = 0; end Is_Empty; ------------- -- Iterate -- ------------- procedure Iterate (Container : Map; Process : not null access procedure (Container : Map; 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 (Container, (Node => Node)); end Process_Node; B : Natural renames Container'Unrestricted_Access.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; --------- -- Key -- --------- function Key (Container : Map; Position : Cursor) return Key_Type is begin if not Has_Element (Container, Position) then raise Constraint_Error with "Position cursor of function Key has no element"; end if; pragma Assert (Vet (Container, Position), "bad cursor in function Key"); return Container.Nodes (Position.Node).Key; end Key; ---------- -- Left -- ---------- function Left (Container : Map; Position : Cursor) return Map is Curs : Cursor; C : Map (Container.Capacity, Container.Modulus) := Copy (Container, Container.Capacity); Node : Count_Type; begin Curs := Position; if Curs = No_Element then return C; end if; if not Has_Element (Container, Curs) then raise Constraint_Error; end if; while Curs.Node /= 0 loop Node := Curs.Node; Delete (C, Curs); Curs := Next (Container, (Node => Node)); end loop; return C; end Left; ------------ -- 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 NN : HT_Types.Nodes_Type renames Source.Nodes; X, Y : Count_Type; begin if Target'Address = Source'Address then return; end if; if Target.Capacity < Length (Source) then raise Constraint_Error with -- ??? "Source length exceeds Target capacity"; end if; if Source.Busy > 0 then raise Program_Error with "attempt to tamper with cursors of Source (list is busy)"; end if; Clear (Target); if Source.Length = 0 then return; end if; X := HT_Ops.First (Source); while X /= 0 loop Insert (Target, NN (X).Key, NN (X).Element); -- optimize??? Y := HT_Ops.Next (Source, X); HT_Ops.Delete_Node_Sans_Free (Source, X); Free (Source, X); X := Y; end loop; end Move; ---------- -- Next -- ---------- function Next (Node : Node_Type) return Count_Type is begin return Node.Next; end Next; function Next (Container : Map; Position : Cursor) return Cursor is begin if Position.Node = 0 then return No_Element; end if; if not Has_Element (Container, Position) then raise Constraint_Error with "Position has no element"; end if; pragma Assert (Vet (Container, Position), "bad cursor in function Next"); declare Node : constant Count_Type := HT_Ops.Next (Container, Position.Node); begin if Node = 0 then return No_Element; end if; return (Node => Node); end; end Next; procedure Next (Container : Map; Position : in out Cursor) is begin Position := Next (Container, Position); end Next; ------------- -- Overlap -- ------------- function Overlap (Left, Right : Map) return Boolean is Left_Node : Count_Type; Left_Nodes : Nodes_Type renames Left.Nodes; begin if Length (Right) = 0 or Length (Left) = 0 then return False; end if; if Left'Address = Right'Address then return True; end if; Left_Node := First (Left).Node; while Left_Node /= 0 loop declare N : Node_Type renames Left_Nodes (Left_Node); E : Key_Type renames N.Key; begin if Find (Right, E).Node /= 0 then return True; end if; end; Left_Node := HT_Ops.Next (Left, Left_Node); end loop; return False; end Overlap; ------------------- -- Query_Element -- ------------------- procedure Query_Element (Container : in out Map; Position : Cursor; Process : not null access procedure (Key : Key_Type; Element : Element_Type)) is begin if not Has_Element (Container, Position) then raise Constraint_Error with "Position cursor of Query_Element has no element"; end if; pragma Assert (Vet (Container, Position), "bad cursor in Query_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; declare K : Key_Type renames N.Key; E : Element_Type renames N.Element; 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 Count_Type; 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 Generic_Allocate (Read_Element); procedure Read_Element (Node : in out Node_Type) is begin 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 set cursor"; end Read; ------------- -- 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 cursors (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 not Has_Element (Container, Position) then raise Constraint_Error with "Position cursor of Replace_Element has no element"; end if; if Container.Lock > 0 then raise Program_Error with "Replace_Element attempted to tamper with cursors (map is locked)"; end if; pragma Assert (Vet (Container, 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; ----------- -- Right -- ----------- function Right (Container : Map; Position : Cursor) return Map is Curs : Cursor := First (Container); C : Map (Container.Capacity, Container.Modulus) := Copy (Container, Container.Capacity); Node : Count_Type; begin if Curs = No_Element then Clear (C); return C; end if; if Position /= No_Element and not Has_Element (Container, Position) then raise Constraint_Error; end if; while Curs.Node /= Position.Node loop Node := Curs.Node; Delete (C, Curs); Curs := Next (Container, (Node => Node)); end loop; return C; end Right; -------------- -- Set_Next -- -------------- procedure Set_Next (Node : in out Node_Type; Next : Count_Type) is begin Node.Next := Next; end Set_Next; ------------------ -- Strict_Equal -- ------------------ function Strict_Equal (Left, Right : Map) return Boolean is CuL : Cursor := First (Left); CuR : Cursor := First (Right); begin if Length (Left) /= Length (Right) then return False; end if; while CuL.Node /= 0 or CuR.Node /= 0 loop if CuL.Node /= CuR.Node or else (Left.Nodes (CuL.Node).Element /= Right.Nodes (CuR.Node).Element or Left.Nodes (CuL.Node).Key /= Right.Nodes (CuR.Node).Key) then return False; end if; CuL := Next (Left, CuL); CuR := Next (Right, CuR); end loop; return True; end Strict_Equal; -------------------- -- 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 not Has_Element (Container, Position) then raise Constraint_Error with "Position cursor of Update_Element has no element"; end if; pragma Assert (Vet (Container, Position), "bad cursor in Update_Element"); declare B : Natural renames Container.Busy; L : Natural renames Container.Lock; begin B := B + 1; L := L + 1; declare N : Node_Type renames Container.Nodes (Position.Node); K : Key_Type renames N.Key; E : Element_Type renames N.Element; 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; --------- -- Vet -- --------- function Vet (Container : Map; Position : Cursor) return Boolean is begin if Position.Node = 0 then return True; end if; declare X : Count_Type; begin if Container.Length = 0 then return False; end if; if Container.Capacity = 0 then return False; end if; if Container.Buckets'Length = 0 then return False; end if; if Position.Node > Container.Capacity then return False; end if; if Container.Nodes (Position.Node).Next = Position.Node then return False; end if; X := Container.Buckets (Key_Ops.Index (Container, Container.Nodes (Position.Node).Key)); for J in 1 .. Container.Length loop if X = Position.Node then return True; end if; if X = 0 then return False; end if; if X = Container.Nodes (X).Next then -- Prevent unnecessary looping return False; end if; X := Container.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; end Ada.Containers.Formal_Hashed_Maps;
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