private bool matchesEmergencyNumberHelper(String number, String regionCode,
bool allowPrefixMatch)
{
number = PhoneNumberUtil.extractPossibleNumber(number);
if (PhoneNumberUtil.PLUS_CHARS_PATTERN.MatchBeginning(number).Success)
{
// 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);
}
PhoneMetadata metadata = MetadataManager.getShortNumberMetadataForRegion(regionCode);
if (metadata == null || !metadata.HasEmergency())
{
return(false);
}
var emergencyNumberPattern =
new JavaRegex(metadata.getEmergency().getNationalNumberPattern());
String normalizedNumber = PhoneNumberUtil.normalizeDigitsOnly(number);
return((!allowPrefixMatch || REGIONS_WHERE_EMERGENCY_NUMBERS_MUST_BE_EXACT.Contains(regionCode))
? emergencyNumberPattern.MatchWhole(normalizedNumber).Success
: emergencyNumberPattern.MatchBeginning(normalizedNumber).Success);
}
/**
* Trims away any characters after the first match of {@code Regex} in {@code candidate},
* returning the trimmed version.
*/
private static string trimAfterFirstMatch(JavaRegex regex, string candidate)
{
var trailingCharsMatcher = regex.Match(candidate);
if (trailingCharsMatcher.Success)
{
candidate = candidate.Substring(0, trailingCharsMatcher.Index);
}
return(candidate);
}
static PhoneNumberMatcher()
{
/* Builds the MATCHING_BRACKETS and Regex regular expressions. The building blocks below exist
* to make the Regex more easily understood. */
String openingParens = "(\\[\uFF08\uFF3B";
String closingParens = ")\\]\uFF09\uFF3D";
String nonParens = "[^" + openingParens + closingParens + "]";
/* Limit on the number of pairs of brackets in a phone number. */
String bracketPairLimit = limit(0, 3);
/*
* An opening bracket at the beginning may not be closed, but subsequent ones should be. It's
* also possible that the leading bracket was dropped, so we shouldn't be surprised if we see a
* closing bracket first. We limit the sets of brackets in a phone number to four.
*/
MATCHING_BRACKETS = new JavaRegex(
"(?:[" + openingParens + "])?" + "(?:" + nonParens + "+" + "[" + closingParens + "])?" +
nonParens + "+" +
"(?:[" + openingParens + "]" + nonParens + "+[" + closingParens + "])" + bracketPairLimit +
nonParens + "*");
/* Limit on the number of leading (plus) characters. */
String leadLimit = limit(0, 2);
/* Limit on the number of consecutive punctuation characters. */
String punctuationLimit = limit(0, 4);
/* The maximum number of digits allowed in a digit-separated block. As we allow all digits in a
* single block, set high enough to accommodate the entire national number and the international
* country code. */
int digitBlockLimit =
PhoneNumberUtil.MAX_LENGTH_FOR_NSN + PhoneNumberUtil.MAX_LENGTH_COUNTRY_CODE;
/* Limit on the number of blocks separated by punctuation. Uses digitBlockLimit since some
* formats use spaces to separate each digit. */
String blockLimit = limit(0, digitBlockLimit);
/* A punctuation sequence allowing white space. */
String punctuation = "[" + PhoneNumberUtil.VALID_PUNCTUATION + "]" + punctuationLimit;
/* A digits block without punctuation. */
String digitSequence = "\\p{Nd}" + limit(1, digitBlockLimit);
String leadClassChars = openingParens + PhoneNumberUtil.PLUS_CHARS;
String leadClass = "[" + leadClassChars + "]";
LEAD_CLASS = new JavaRegex(leadClass);
/* Phone number Regex allowing optional punctuation. */
PATTERN = new JavaRegex(
"(?:" + leadClass + punctuation + ")" + leadLimit +
digitSequence + "(?:" + punctuation + digitSequence + ")" + blockLimit +
"(?:" + PhoneNumberUtil.EXTN_PATTERNS_FOR_MATCHING + ")?",
PhoneNumberUtil.REGEX_FLAGS);
}
public JavaRegex getRegexForRegex(String regex)
{
var Regex = _cache.Get(regex);
if (Regex == null)
{
Regex = new JavaRegex(regex);
_cache.Add(regex, Regex);
}
return(Regex);
}
private void narrowDownPossibleFormats(String leadingDigits)
{
int indexOfLeadingDigitsRegex = leadingDigits.Length - MIN_LEADING_DIGITS_LENGTH;
foreach (var format in possibleFormats.ToArray())
{
if (format.leadingDigitsPatternSize() == 0)
{
// Keep everything that isn't restricted by leading digits.
continue;
}
int lastLeadingDigitsRegex =
Math.Min(indexOfLeadingDigitsRegex, format.leadingDigitsPatternSize() - 1);
JavaRegex leadingDigitsRegex = regexCache.getRegexForRegex(
format.getLeadingDigitsPattern(lastLeadingDigitsRegex));
var m = leadingDigitsRegex.MatchBeginning(leadingDigits);
if (!m.Success)
{
possibleFormats.Remove(format);
}
}
}
