Quelle Undo.pas Sprache: Delphi

unit Undo;
interface
uses
  //----------------------------------------------------------
  //local
  //----------------------------------------------------------
  GenDefs,Language,
  //----------------------------------------------------------
  //global
  //----------------------------------------------------------
  ComCtrls,Classes,Messages,Controls,Graphics,RichEdit,Types,ShellAPI;
//----------------------------------------------------------
//
//----------------------------------------------------------
const
  linemargin=55;
  margin=20;
  //----------------------------------------------------------
  //
  //----------------------------------------------------------
type
  TUndoList= Class(TObject)
    UndoBuffer:TMemoryStream;
    Linearray:array of integer;
    Blockarray:array of integer;
    FirstVisibleLine:integer;
    UndoSelStart:integer;
    UndoSelLength:integer;
    UndoModified:boolean;
    Next,Previous:TUndoList;
    constructor Create(Siz,Sels,Sell:integer);
    destructor Destroy();override;
  end;
  //----------------------------------------------------------
  //
  //----------------------------------------------------------
  Ansiset=set of ansichar;
  RegType=(single,regset);
  RepeatType=(once,onceormore,nulloronce,nulloremore);
  TRegInfo= record
    pos,len:integer;
    ch:char end;
    TRegExp= Class(TObject)R:RegType;
    M:RepeatType;
    ch:ansichar;
    inset:Ansiset;
    Next:TRegExp;
    Previous:TRegExp;
    constructor Create();
    destructor Destroy();override;
    procedure append(N:TRegExp);
  end;
  //----------------------------------------------------------
  //
  //----------------------------------------------------------
implementation
//----------------------------------------------------------
//
//----------------------------------------------------------
constructor TUndoList.Create(Siz,Sels,Sell:integer);
begin
  UndoBuffer:=TMemoryStream.Create;
  UndoBuffer.SetSize(Siz);
  FirstVisibleLine:=0;
  UndoSelStart:=Sels;
  UndoSelLength:=Sell;
  UndoModified:=false;
  Next:=nil;
  Previous:=nil;
end;
//----------------------------------------------------------
//
//----------------------------------------------------------
destructor TUndoList.Destroy();
begin
  //if undobuffer<>nil then   priviledged
  //  UndoBuffer.destroy;
  //Previous.free;
  //Inherited Free;
end;
//----------------------------------------------------------
//
//----------------------------------------------------------
constructor TRegExp.Create();
begin
  Next:=nil;
  R:=single;
  M:=once;
end;
//----------------------------------------------------------
//
//----------------------------------------------------------
destructor TRegExp.Destroy();
begin
  if Next<>nil then
    Next.Free;
end;
//----------------------------------------------------------
//
//----------------------------------------------------------
procedure TRegExp.append(N:TRegExp);
var
  R:TRegExp;
begin
  R:=self;
  while R.Next<>nil do
    R:=R.Next;
  R.Next:=N;
  N.Previous:=R
end;
//----------------------------------------------------------
//
//----------------------------------------------------------
end.

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