61 lines
2.0 KiB
Dart
61 lines
2.0 KiB
Dart
class PhoneNumber {
|
|
static final RegExp _nonNumeric = RegExp(r'[^0-9]+');
|
|
static final RegExp _letters = RegExp('[a-z]');
|
|
static final RegExp _punctuations = RegExp('[@:!?\$%^&*_`~,;]');
|
|
|
|
String clean(String input) {
|
|
_checkForLetters(input);
|
|
_checkForPunctuations(input);
|
|
String cleaned = _removeNonNumeric(input);
|
|
_validateLength(cleaned);
|
|
_validateAreaCode(cleaned);
|
|
_validateExchangeCode(cleaned);
|
|
return (cleaned.length == 11)
|
|
? cleaned = cleaned.replaceFirst('1', '')
|
|
: cleaned;
|
|
}
|
|
|
|
void _checkForLetters(String input) {
|
|
if (input.toLowerCase().contains(_letters))
|
|
throw FormatException('letters not permitted');
|
|
}
|
|
|
|
void _checkForPunctuations(String input) {
|
|
if (input.toLowerCase().contains(_punctuations))
|
|
throw FormatException('punctuations not permitted');
|
|
}
|
|
|
|
String _removeNonNumeric(String input) {
|
|
return input.replaceAll(_nonNumeric, '');
|
|
}
|
|
|
|
void _validateLength(String number) {
|
|
if (number.length < 10)
|
|
throw FormatException('must not be fewer than 10 digits');
|
|
if (number.length > 11)
|
|
throw FormatException('must not be greater than 11 digits');
|
|
if (number.length == 11 && number[0] != '1')
|
|
throw FormatException('11 digits must start with 1');
|
|
}
|
|
|
|
void _validateAreaCode(String number) {
|
|
if (number.length == 10 && number[0] == '0' ||
|
|
number.length == 11 && number[1] == '0')
|
|
throw FormatException('area code cannot start with zero');
|
|
|
|
if (number.length == 10 && number[0] == '1' ||
|
|
number.length == 11 && number[1] == '1')
|
|
throw FormatException('area code cannot start with one');
|
|
}
|
|
|
|
void _validateExchangeCode(String number) {
|
|
if (number.length == 10 && number[3] == '0' ||
|
|
number.length == 11 && number[4] == '0')
|
|
throw FormatException('exchange code cannot start with zero');
|
|
|
|
if (number.length == 10 && number[3] == '1' ||
|
|
number.length == 11 && number[4] == '1')
|
|
throw FormatException('exchange code cannot start with one');
|
|
}
|
|
}
|