src/change_vectors.ads


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with FLTK.Text_Buffers;
with Ada.Strings.Unbounded; use Ada.Strings.Unbounded;
private with Ada.Containers.Vectors;


package Change_Vectors is


    type Change_Vector is tagged private;


    type Change is
        record
            Action : FLTK.Text_Buffers.Modification;
            Place  : FLTK.Text_Buffers.Position;
            Length : Natural;
            Text   : Unbounded_String;
        end record;


    Empty_Vector : constant Change_Vector;


    procedure Push
           (This : in out Change_Vector;
            Item : in     Change);


    function Pop
           (This : in out Change_Vector)
        return Boolean;


    procedure Pop
           (This : in out Change_Vector);


    function Peek
           (This : in     Change_Vector;
            Item :    out Change)
        return Boolean;


    procedure Peek
           (This : in     Change_Vector;
            Item :    out Change);


    function Re_Push
           (This : in out Change_Vector)
        return Boolean;


    procedure Re_Push
           (This : in out Change_Vector);


    function At_Start
           (This : in Change_Vector)
        return Boolean;


    function At_End
           (This : in Change_Vector)
        return Boolean;


private


    package Internal_Vectors is new Ada.Containers.Vectors
           (Index_Type => Positive, Element_Type => Change);


    type Change_Vector is tagged
        record
            Near, Far : Natural;
            List      : Internal_Vectors.Vector;
        end record;


    Empty_Vector : constant Change_Vector :=
           (Near => 0,
            Far => 0,
            List => Internal_Vectors.Empty_Vector);


end Change_Vectors;