public string NextLineToken()

in src/Editor/Text/Impl/DifferenceAlgorithm/TFS/DiffFinder.cs [422:491]
62 lines of code
20 McCabe index (conditional complexity)

        public string NextLineToken(out EndOfLineTerminator endOfLine)
        {
            // The structure of this code is borrowed from StreamReader.ReadLine()
            // Except that it has been extended out to support Unicode EOL characters.
            m_stringBuilder.Length = 0;
            endOfLine = EndOfLineTerminator.None;

            if (m_currBufferPos == m_numCharsInBuffer && FillBuffer() == 0)
            {
                // If the buffer was empty, and we couldn't refill it, we're done.
                return null;
            }
            do
            {
                int index = m_currBufferPos;
                do
                {
                    char ch = m_charBuffer[index];
                    if (ch == '\r' || ch == '\n' ||
                        (m_isUnicodeEncoding && (ch == LineSeparator || ch == ParagraphSeparator || ch == NextLine)))
                    {
                        switch ((int)ch)
                        {
                            case '\r':
                                endOfLine = EndOfLineTerminator.CarriageReturn;
                                break;
                            case '\n':
                                endOfLine = EndOfLineTerminator.LineFeed;
                                break;
                            case LineSeparator:
                                endOfLine = EndOfLineTerminator.LineSeparator;
                                break;
                            case ParagraphSeparator:
                                endOfLine = EndOfLineTerminator.ParagraphSeparator;
                                break;
                            case NextLine:
                                endOfLine = EndOfLineTerminator.NextLine;
                                break;
                        }

                        String line;
                        if (m_stringBuilder.Length > 0)
                        {
                            m_stringBuilder.Append(m_charBuffer, m_currBufferPos, index - m_currBufferPos);
                            line = m_stringBuilder.ToString();
                        }
                        else
                        {
                            line = new String(m_charBuffer, m_currBufferPos, index - m_currBufferPos);
                        }

                        m_currBufferPos = index + 1;
                        if (ch == '\r' && (m_currBufferPos < m_numCharsInBuffer || FillBuffer() > 0))
                        {
                            if (m_charBuffer[m_currBufferPos] == '\n')
                            {
                                endOfLine = EndOfLineTerminator.CarriageReturnLineFeed;
                                m_currBufferPos++;
                            }
                        }

                        return line;
                    }
                    index++;
                } while (index < m_numCharsInBuffer);
                m_stringBuilder.Append(m_charBuffer, m_currBufferPos, m_numCharsInBuffer - m_currBufferPos);
            } while (FillBuffer() > 0);

            return m_stringBuilder.ToString();
        }