Alsing.SourceCode.SyntaxDocument.InsertText C# (CSharp) Метод

        public TextPoint InsertText(string text, int xPos, int yPos, bool StoreUndo)
        {
            Modified = true;
            Row xtr = this[yPos];
            if (xPos > xtr.Text.Length)
            {
                //virtualwhitespace fix
                int Padd = xPos - xtr.Text.Length;
                var PaddStr = new string(' ', Padd);
                text = PaddStr + text;
                xPos -= Padd;
            }
            string lft = xtr.Text.Substring(0, xPos);
            string rgt = xtr.Text.Substring(xPos);
            string NewText = lft + text + rgt;


            string t = NewText.Replace(Environment.NewLine, "\n");
            string[] lines = t.Split('\n');
            xtr.Text = lines[0];

            Row lastrow = xtr;

            //this.Parser.ParsePreviewLine(xtr);	
            xtr.Parse();
            if (!xtr.InQueue)
                ParseQueue.Add(xtr);
            xtr.InQueue = true;

            int i = IndexOf(xtr);
            for (int j = 1; j <= lines.GetUpperBound(0); j++)
            {
                lastrow = Insert(lines[j], j + i, false);
            }

            if (StoreUndo)
                PushUndoBlock(UndoAction.InsertRange, text, xPos, yPos);

            ResetVisibleRows();
            OnChange();


            return new TextPoint(lastrow.Text.Length - rgt.Length, IndexOf(lastrow));
        }