/// <summary> /// Tries the parse email address. /// </summary> /// <param name="email">The data.</param> /// <param name="parsedAddress">The parsed address.</param> /// <param name="throwExceptionIfFail">if set to <c>true</c> [throw exception if fail].</param> /// <returns><c>true</c> if XXXX, <c>false</c> otherwise.</returns> public static bool TryParseEmailAddress(string email, out ParseAddressInfo parsedAddress, bool throwExceptionIfFail) { Encapsulation.TryValidateParam(email, nameof(email)); return(TryParseEmailAddress(email, false, email.Length - 1, out parsedAddress, throwExceptionIfFail)); }
private static bool TryParseEmailAddress(string data, bool expectMultipleAddresses, int index, out ParseAddressInfo parseAddressInfo, bool throwExceptionIfFail) { Debug.Assert(!string.IsNullOrEmpty(data)); Debug.Assert(index >= 0 && index < data.Length, "Index out of range: " + index + ", " + data.Length); // Parsed components to be assembled as a MailAddress later string displayName; // Skip comments and whitespace if (!TryReadCfwsAndThrowIfIncomplete(data, index, out index, throwExceptionIfFail)) { parseAddressInfo = default; return(false); } // Do we expect angle brackets around the address? // e.g. ("display name" <user@domain>) bool expectAngleBracket = false; if (data[index] == dotNetTips.Utility.Standard.Common.ControlChars.EndAngleBracket) { expectAngleBracket = true; index--; } if (!TryParseDomain(data, ref index, out string domain, throwExceptionIfFail)) { parseAddressInfo = default; return(false); } // The next character after the domain must be the '@' symbol if (data[index] != dotNetTips.Utility.Standard.Common.ControlChars.At) { if (throwExceptionIfFail) { throw new FormatException("Invalid email address."); } else { parseAddressInfo = default; return(false); } } // Skip the '@' symbol index--; if (!TryParseLocalPart(data, ref index, expectAngleBracket, expectMultipleAddresses, out var localPart, throwExceptionIfFail)) { parseAddressInfo = default; return(false); } // Check for a matching angle bracket around the address if (expectAngleBracket) { if (index >= 0 && data[index] == dotNetTips.Utility.Standard.Common.ControlChars.StartAngleBracket) { index--; // Skip the angle bracket // Skip whitespace, but leave comments, as they may be part of the display name. if (!WhitespaceReader.TryReadFwsReverse(data, index, out index, throwExceptionIfFail)) { parseAddressInfo = default; return(false); } } else { // Mismatched angle brackets if (throwExceptionIfFail) { throw new FormatException($"Invalid character: {( index >= 0 ? data[index] : dotNetTips.Utility.Standard.Common.ControlChars.EndAngleBracket )}."); } else { parseAddressInfo = default; return(false); } } } // Is there anything left to parse? // There could still be a display name or another address if (index >= 0 && !(expectMultipleAddresses && data[index] == dotNetTips.Utility.Standard.Common.ControlChars.Comma)) { if (!TryParseDisplayName(data, ref index, expectMultipleAddresses, out displayName, throwExceptionIfFail)) { parseAddressInfo = default; return(false); } } else { displayName = string.Empty; } parseAddressInfo = new ParseAddressInfo(displayName, localPart, domain); return(true); }