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47 lines
1.2 KiB
47 lines
1.2 KiB
import 'package:flutter/foundation.dart';
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abstract class Validator<T> {
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Validator({@required this.errorMessage});
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final String errorMessage;
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bool isValid(T value);
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String call(T value) => !isValid(value) ? errorMessage : null;
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}
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class TextValidator extends Validator<String> {
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TextValidator(
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{this.minLength,
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this.maxLength,
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this.pattern,
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this.length,
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this.isAutovalidate = false,
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String errorMessage})
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: super(errorMessage: errorMessage);
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final int minLength;
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final int maxLength;
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final List<int> length;
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final bool isAutovalidate;
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String pattern;
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@override
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bool isValid(String value) {
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if (value == null || value.isEmpty) {
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return isAutovalidate ? true : false;
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}
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return value.length > (minLength ?? 0) &&
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(length?.contains(value.length) ?? true) &&
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((maxLength ?? 0) > 0 ? (value.length <= maxLength) : true) &&
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(pattern != null ? match(value) : true);
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}
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bool match(String value) => RegExp(pattern).hasMatch(value);
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}
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class WalletNameValidator extends TextValidator {
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WalletNameValidator()
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: super(minLength: 1, maxLength: 15, pattern: '^[a-zA-Z0-9_]\$');
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} |