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⟦1940ab6de⟧ Ada Source

    Length: 8192 (0x2000)
    Types: Ada Source
    Notes: 03_class, FILE, R1k_Segment, e3_tag, package body Generic_Binary_Tree, seg_04750d

Derivation

└─⟦8527c1e9b⟧ Bits:30000544 8mm tape, Rational 1000, Arrival backup of disks in PAM's R1000
    └─⟦5a81ac88f⟧ »Space Info Vol 1« 
        └─⟦this⟧ 

package body Generic_Binary_Tree is

    procedure Purge (The_Tree : in out Object) is
    begin
        The_Tree := null;
    end Purge;

    function Is_Empty (The_Tree : in Object) return Boolean is
    begin
        return (The_Tree = null);
    end Is_Empty;

    function Consult (The_Tree : in Object) return Element is
    begin
        return The_Tree.Content;
    end Consult;

    procedure Insert (The_Tree : in out Object; What : Element) is
    begin
        if (Is_Empty (The_Tree) = True) then
            The_Tree := new Node'(Content => What, Left => null, Right => null);
        else
            if (Are_Equal (Consult (The_Tree), What)) then
                raise Value_Already_Exists;
            end if;
            if (What < Consult (The_Tree)) then
                Insert (The_Tree.Left, What);
            else
                Insert (The_Tree.Right, What);
            end if;
        end if;
    end Insert;

    procedure Get_Value (The_Tree : in Object; What : in out Element) is
    begin
        if not Is_Empty (The_Tree) then
            if (Are_Equal (Consult (The_Tree), What)) then
                What := Consult (The_Tree);
            else  
                if (What < Consult (The_Tree)) then
                    Get_Value (The_Tree.Left, What);
                else
                    Get_Value (The_Tree.Right, What);
                end if;
            end if;
        else
            raise Value_Does_Not_Exist;
        end if;
    end Get_Value;

    procedure Update (The_Tree : in Object; What : in Element) is
    begin  
        if not Is_Empty (The_Tree) then
            if (Are_Equal (Consult (The_Tree), What)) then
                The_Tree.Content := What;
            else  
                if (What < Consult (The_Tree)) then
                    Update (The_Tree.Left, What);
                else
                    Update (The_Tree.Right, What);
                end if;
            end if;
        else
            raise Value_Does_Not_Exist;
        end if;
    end Update;


    function Exists (The_Tree : in Object; What : in Element) return Boolean is
    begin
        if not Is_Empty (The_Tree) then
            if (Are_Equal (Consult (The_Tree), What)) then
                return True;
            else
                if (What < Consult (The_Tree)) then
                    return Exists (The_Tree.Left, What);
                else
                    return Exists (The_Tree.Right, What);
                end if;
            end if;
        else
            return False;
        end if;
    end Exists;

    procedure Light_Copy (Source : in Object; Target : in out Object) is
    begin
        Target := Source;
    end Light_Copy;

    procedure Deep_Copy (Source : in Object; Target : in out Object) is
    begin  
        if not Is_Empty (Source) then
            Target := new Node;
            Deep_Copy (Source.Content, Target.Content);
            Deep_Copy (Source.Left, Target.Left);
            Deep_Copy (Source.Right, Target.Right);
        end if;

    end Deep_Copy;

-- gestion de l'iterateur

    procedure Open (It : in out Iterator; The_Tree : Object) is
    begin
        It.Current := The_Tree;
        It.Is_Opened := True;
        if not (Stack.Is_Empty (It.The_Stack)) then
            Stack.Dispose (It.The_Stack);
        end if;
        Stack.Push (It.The_Stack, It.Current);
        while ((It.Current.Left) /= null) loop
            It.Current := It.Current.Left;
            Stack.Push (It.The_Stack, It.Current);
        end loop;
    end Open;


    procedure Next (It : in out Iterator) is
        Parent : Object;
        Stop : Boolean := False;
    begin  
        if not (It.Is_Opened) then
            raise Iterator_Is_Not_Opened;
        end if;
        if ((It.Current.Right) /= null) then
            It.Current := It.Current.Right;
            Stack.Push (It.The_Stack, It.Current);
            while ((It.Current.Left) /= null) loop
                It.Current := It.Current.Left;
                Stack.Push (It.The_Stack, It.Current);
            end loop;
        else
            Stack.Pop (It.The_Stack);
            while ((Stack.Is_Empty (It.The_Stack) = False) and
                   (Stop = False)) loop
                Parent := Stack.Consult (It.The_Stack);
                if (It.Current /= (Parent.Right)) then
                    Stop := True;
                else
                    Stack.Pop (It.The_Stack);
                end if;
                It.Current := Parent;
            end loop;
        end if;
    end Next;

    function At_End (It : in Iterator) return Boolean is
    begin
        if not (It.Is_Opened) then
            raise Iterator_Is_Not_Opened;
        end if;
        return Stack.Is_Empty (It.The_Stack);
    end At_End;

    function Consult (It : Iterator) return Element is
    begin  
        if not (It.Is_Opened) then
            raise Iterator_Is_Not_Opened;
        end if;
        return (It.Current.Content);
    end Consult;


end Generic_Binary_Tree;

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