public static void CollectLineSpans()

in src/StructuredLogger/TextUtilities.cs [17:113]
84 lines of code
16 McCabe index (conditional complexity)

        public static void CollectLineSpans(this string text, ICollection<Span> spans, bool includeLineBreakInSpan = true)
        {
            if (text == null)
            {
                throw new ArgumentNullException(nameof(text));
            }

            if (spans == null)
            {
                throw new ArgumentNullException(nameof(spans));
            }

            if (text.Length == 0)
            {
                return;
            }

            int currentPosition = 0;
            int currentLineLength = 0;
            bool previousWasCarriageReturn = false;

            for (int i = 0; i < text.Length; i++)
            {
                var ch = text[i];
                if (ch == '\r')
                {
                    if (previousWasCarriageReturn)
                    {
                        int lineLengthIncludingLineBreak = currentLineLength;
                        if (!includeLineBreakInSpan)
                        {
                            currentLineLength--;
                        }

                        spans.Add(new Span(currentPosition, currentLineLength));

                        currentPosition += lineLengthIncludingLineBreak;
                        currentLineLength = 1;
                    }
                    else
                    {
                        currentLineLength++;
                        previousWasCarriageReturn = true;
                    }
                }
                else if (ch == '\n')
                {
                    var lineLength = currentLineLength;
                    if (previousWasCarriageReturn)
                    {
                        lineLength--;
                    }

                    currentLineLength++;
                    previousWasCarriageReturn = false;
                    if (includeLineBreakInSpan)
                    {
                        lineLength = currentLineLength;
                    }

                    spans.Add(new Span(currentPosition, lineLength));
                    currentPosition += currentLineLength;
                    currentLineLength = 0;
                }
                else
                {
                    if (previousWasCarriageReturn)
                    {
                        var lineLength = currentLineLength;
                        if (!includeLineBreakInSpan)
                        {
                            lineLength--;
                        }

                        spans.Add(new Span(currentPosition, lineLength));
                        currentPosition += currentLineLength;
                        currentLineLength = 0;
                        previousWasCarriageReturn = false;
                    }

                    currentLineLength++;
                }
            }

            var finalLength = currentLineLength;
            if (previousWasCarriageReturn && !includeLineBreakInSpan)
            {
                finalLength--;
            }

            spans.Add(new Span(currentPosition, finalLength));

            if (previousWasCarriageReturn)
            {
                spans.Add(new Span(currentPosition, 0));
            }
        }