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