Pchp.Library.Streams.TextReadFilter.Filter C# (CSharp) Method

        public TextElement Filter(Context ctx, TextElement input, bool closing)
        {
            string str = input.AsText(ctx.StringEncoding);

            if (pending)
            {
                // Both \r\n together make a pair which would consume a pending \r.
                if (str.Length == 0) str = "\r";
                else if (str[0] != '\n') str.Insert(0, "\r");
            }

            // Replace the pair.
            str = str.Replace("\r\n", "\n");
            if (str.Length != 0)
            {
                // Check for pending \r at the end.
                pending = str[str.Length - 1] == '\r';

                // Postpone the resolution of \r\n vs. \r to the next filtering if this is not the last one.
                if (!closing && pending) str.Remove(str.Length - 1, 1);
            }

            //
            return new TextElement(str);
        }