System.NumberFormatter.CustomInfo.Parse C# (CSharp) Method

			public static CustomInfo Parse (string format, int offset, int length, NumberFormatInfo nfi)
			{
				char literal = '\0';
				bool integerArea = true;
				bool decimalArea = false;
				bool exponentArea = false;
				bool sharpContinues = true;

				CustomInfo info = new CustomInfo ();
				int groupSeparatorCounter = 0;

				for (int i = offset; i - offset < length; i++) {
					char c = format [i];

					if (c == literal && c != '\0') {
						literal = '\0';
						continue;
					}
					if (literal != '\0')
						continue;

					if (exponentArea && (c != '\0' && c != '0' && c != '#')) {
						exponentArea = false;
						integerArea = (info.DecimalPointPos < 0);
						decimalArea = !integerArea;
						i--;
						continue;
					}

					switch (c) {
					case '\\':
						i++;
						continue;
					case '\'':
					case '\"':
						if (c == '\"' || c == '\'') {
							literal = c;
						}
						continue;
					case '#':
						if (sharpContinues && integerArea)
							info.IntegerHeadSharpDigits++;
						else if (decimalArea)
							info.DecimalTailSharpDigits++;
						else if (exponentArea)
							info.ExponentTailSharpDigits++;

						goto case '0';
					case '0':
						if (c != '#') {
							sharpContinues = false;
							if (decimalArea)
								info.DecimalTailSharpDigits = 0;
							else if (exponentArea)
								info.ExponentTailSharpDigits = 0;
						}
						if (info.IntegerHeadPos == -1)
							info.IntegerHeadPos = i;

						if (integerArea) {
							info.IntegerDigits++;
							if (groupSeparatorCounter > 0)
								info.UseGroup = true;
							groupSeparatorCounter = 0;
						}
						else if (decimalArea)
							info.DecimalDigits++;
						else if (exponentArea)
							info.ExponentDigits++;
						break;
					case 'e':
					case 'E':
						if (info.UseExponent)
							break;

						info.UseExponent = true;
						integerArea = false;
						decimalArea = false;
						exponentArea = true;
						if (i + 1 - offset < length) {
							char nc = format [i + 1];
							if (nc == '+')
								info.ExponentNegativeSignOnly = false;
							if (nc == '+' || nc == '-')
								i++;
							else if (nc != '0' && nc != '#') {
								info.UseExponent = false;
								if (info.DecimalPointPos < 0)
									integerArea = true;
							}
						}

						break;
					case '.':
						integerArea = false;
						decimalArea = true;
						exponentArea = false;
						if (info.DecimalPointPos == -1)
							info.DecimalPointPos = i;
						break;
					case '%':
						info.Percents++;
						break;
					case '\u2030':
						info.Permilles++;
						break;
					case ',':
						if (integerArea && info.IntegerDigits > 0)
							groupSeparatorCounter++;
						break;
					default:
						break;
					}
				}

				if (info.ExponentDigits == 0)
					info.UseExponent = false;
				else
					info.IntegerHeadSharpDigits = 0;

				if (info.DecimalDigits == 0)
					info.DecimalPointPos = -1;

				info.DividePlaces += groupSeparatorCounter * 3;

				return info;
			}