void Parse()

in src/aws-cpp-sdk-core/source/utils/DateTimeCommon.cpp [425:606]
172 lines of code
43 McCabe index (conditional complexity)

    void Parse() override
    {
        size_t len = strlen(m_toParse);

        //DOS check
        if (len > MAX_LEN)
        {
            AWS_LOGSTREAM_WARN(CLASS_TAG, "Incoming String to parse too long with length: " << len)
            m_error = true;
            return;
        }

        size_t index = 0;
        size_t stateStartIndex = 0;
        int finalState = 8;

        while(m_state <= finalState && !m_error && index < len)
        {
            char c = m_toParse[index];

            switch (m_state)
            {
                case 0:
                    if(c == ',')
                    {
                        int weekNumber = GetWeekDayNumberFromStr(m_toParse, stateStartIndex, index + 1);

                        if (weekNumber > -1)
                        {
                            m_state = 1;
                            stateStartIndex = index + 1;
                            m_parsedTimestamp.tm_wday = weekNumber;
                        }
                        else
                        {
                            m_error = true;
                        }
                    }
                    else if(!isalpha(c))
                    {
                        m_error = true;
                    }
                    break;
                case 1:
                    if (isspace(c))
                    {
                        m_state = 2;
                        stateStartIndex = index + 1;
                    }
                    else
                    {
                        m_error = true;
                    }
                    break;
                case 2:
                    if (isdigit(c))
                    {
                        m_parsedTimestamp.tm_mday = m_parsedTimestamp.tm_mday * 10 + (c - '0');
                    }
                    else if(isspace(c))
                    {
                        m_state = 3;
                        stateStartIndex = index + 1;
                    }
                    else
                    {
                        m_error = true;
                    }
                    break;
                case 3:
                    if (isspace(c))
                    {
                        int monthNumber = GetMonthNumberFromStr(m_toParse, stateStartIndex, index + 1);

                        if (monthNumber > -1)
                        {
                            m_state = 4;
                            stateStartIndex = index + 1;
                            m_parsedTimestamp.tm_mon = monthNumber;
                        }
                        else
                        {
                            m_error = true;
                        }
                    }
                    else if (!isalpha(c))
                    {
                        m_error = true;
                    }
                    break;
                case 4:
                    if (isspace(c) && index - stateStartIndex == 4)
                    {
                        m_state = 5;
                        stateStartIndex = index + 1;
                        m_parsedTimestamp.tm_year -= 1900;
                    }
                    else if (isspace(c) && index - stateStartIndex == 2)
                    {
                        m_state = 5;
                        stateStartIndex = index + 1;
                        m_parsedTimestamp.tm_year += 2000 - 1900;
                    }
                    else if (isdigit(c))
                    {
                        m_parsedTimestamp.tm_year = m_parsedTimestamp.tm_year * 10 + (c - '0');
                    }
                    else
                    {
                        m_error = true;
                    }
                    break;
                case 5:
                    if(c == ':' && index - stateStartIndex == 2)
                    {
                        m_state = 6;
                        stateStartIndex = index + 1;
                    }
                    else if (isdigit(c))
                    {
                        m_parsedTimestamp.tm_hour = m_parsedTimestamp.tm_hour * 10 + (c - '0');
                    }
                    else
                    {
                        m_error = true;
                    }
                    break;
                case 6:
                    if (c == ':' && index - stateStartIndex == 2)
                    {
                        m_state = 7;
                        stateStartIndex = index + 1;
                    }
                    else if (isdigit(c))
                    {
                        m_parsedTimestamp.tm_min = m_parsedTimestamp.tm_min * 10 + (c - '0');
                    }
                    else
                    {
                        m_error = true;
                    }
                    break;
                case 7:
                    if (isspace(c) && index - stateStartIndex == 2)
                    {
                        m_state = 8;
                        stateStartIndex = index + 1;
                    }
                    else if (isdigit(c))
                    {
                        m_parsedTimestamp.tm_sec = m_parsedTimestamp.tm_sec * 10 + (c - '0');
                    }
                    else
                    {
                        m_error = true;
                    }
                    break;
                case 8:
                    if ((isalnum(c) || c == '+' || c == '-') && (index - stateStartIndex < 5))
                    {
                        m_tz[index - stateStartIndex] = c;
                    }
                    else
                    {
                        m_error = true;
                    }
                    break;
                default:
                    m_error = true;
                    break;
            }

            index++;
        }

        if (m_tz[0] != 0)
        {
           m_utcAssumed = IsUTCTimeZoneDesignator(m_tz);
        }

        m_error = (m_error || m_state != finalState);
    }