private bool MatchesEmergencyNumberHelper(string number, string regionCode,
bool allowPrefixMatch)
{
var possibleNumber = PhoneNumberUtil.ExtractPossibleNumber(number);
if (possibleNumber.Length > 0 && PhoneNumberUtil.IsPlusChar(possibleNumber[0]))
{
// Returns false if the number starts with a plus sign. We don't believe dialing the country
// code before emergency numbers (e.g. +1911) works, but later, if that proves to work, we can
// add additional logic here to handle it.
return(false);
}
var metadata = MetadataManager.GetShortNumberMetadataForRegion(regionCode);
if (metadata == null || !metadata.HasEmergency)
{
return(false);
}
var normalizedNumber = PhoneNumberUtil.NormalizeDigitsOnly(possibleNumber);
var allowPrefixMatchForRegion =
allowPrefixMatch && !RegionsWhereEmergencyNumbersMustBeExact.Contains(regionCode);
return(matcherApi.MatchNationalNumber(normalizedNumber, metadata.Emergency,
allowPrefixMatchForRegion));
}
// Accrues digits and the plus sign to accruedInputWithoutFormatting for later use. If nextChar
// contains a digit in non-ASCII format (e.g. the full-width version of digits), it is first
// normalized to the ASCII version. The return value is nextChar itself, or its normalized
// version, if nextChar is a digit in non-ASCII format. This method assumes its input is either a
// digit or the plus sign.
private char NormalizeAndAccrueDigitsAndPlusSign(char nextChar, bool rememberPosition)
{
if (PhoneNumberUtil.IsPlusChar(nextChar))
{
nextChar = PhoneNumberUtil.PLUS_SIGN;
accruedInputWithoutFormatting.Append(nextChar);
}
else
{
if ((uint)(nextChar - '0') > 9)
{
nextChar = ((int)char.GetNumericValue(nextChar)).ToString()[0];
}
accruedInputWithoutFormatting.Append(nextChar);
nationalNumber.Append(nextChar);
}
if (rememberPosition)
{
positionToRemember = accruedInputWithoutFormatting.Length;
}
return(nextChar);
}
private bool IsDigitOrLeadingPlusSign(char nextChar)
{
return(char.IsDigit(nextChar) ||
accruedInput.Length == 1 &&
PhoneNumberUtil.IsPlusChar(nextChar));
}