System.Globalization.DateTimeFormatInfoScanner.ScanDateWord C# (CSharp) Méthode

        internal void ScanDateWord(String pattern)
        {

            // Check if we have found all of the year/month/day pattern.
            m_ymdFlags = FoundDatePattern.None;
            
            int i = 0;
            while (i < pattern.Length)
            {
                char ch = pattern[i];  
                int chCount;
                
                switch (ch)
                {
                    case '\'':
                        // Find a beginning quote.  Search until the end quote.
                        i = AddDateWords(pattern, i+1, null);
                        break;
                    case 'M':
                        i = ScanRepeatChar(pattern, 'M', i, out chCount);
                        if (chCount >= 4)
                        {
                            if (i < pattern.Length && pattern[i] == '\'')
                            {
                                i = AddDateWords(pattern, i+1, "MMMM");
                            }
                        }
                        m_ymdFlags |= FoundDatePattern.FoundMonthPatternFlag;
                        break;
                    case 'y':
                        i = ScanRepeatChar(pattern, 'y', i, out chCount);
                        m_ymdFlags |= FoundDatePattern.FoundYearPatternFlag;
                        break;
                    case 'd':
                        i = ScanRepeatChar(pattern, 'd', i, out chCount);
                        if (chCount <= 2)
                        {
                            // Only count "d" & "dd".
                            // ddd, dddd are day names.  Do not count them.
                            m_ymdFlags |= FoundDatePattern.FoundDayPatternFlag;
                        }
                        break;
                    case '\\':
                        // Found a escaped char not in a quoted string.  Skip the current backslash
                        // and its next character.
                        i += 2;
                        break;
                    case '.':
                        if (m_ymdFlags == FoundDatePattern.FoundYMDPatternFlag)
                        {
                            // If we find a dot immediately after the we have seen all of the y, m, d pattern.
                            // treat it as a ignroable symbol.  Check for comments in AddIgnorableSymbols for
                            // more details.
                            AddIgnorableSymbols(".");
                            m_ymdFlags = FoundDatePattern.None;
                        }
                        i++;
                        break;
                    default:
                        if (m_ymdFlags == FoundDatePattern.FoundYMDPatternFlag && !Char.IsWhiteSpace(ch))
                        {
                            // We are not seeing "." after YMD. Clear the flag.
                            m_ymdFlags = FoundDatePattern.None;
                        }
                        // We are not in quote.  Skip the current character.
                        i++;
                        break;
                }                        
            }            
        }