77 lines
2.9 KiB
Dart
77 lines
2.9 KiB
Dart
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import 'package:matcher/matcher.dart';
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final RegExp _alphaDash = RegExp(r'^[A-Za-z0-9_-]+$');
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final RegExp _alphaNum = RegExp(r'^[A-Za-z0-9]+$');
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final RegExp _email = RegExp(
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r"^[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?$");
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final RegExp _url = RegExp(
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r'https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,6}\b([-a-zA-Z0-9@:%_\+.~#?&//=]*)');
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/// Asserts that a `String` is alphanumeric, but also lets it contain dashes or underscores.
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final Matcher isAlphaDash = predicate(
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(value) => value is String && _alphaDash.hasMatch(value),
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'alphanumeric (dashes and underscores are allowed)');
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/// Asserts that a `String` is alphanumeric, but also lets it contain dashes or underscores.
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///
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final Matcher isAlphaNum = predicate(
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(value) => value is String && _alphaNum.hasMatch(value), 'alphanumeric');
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/// Asserts that a value either equals `true` or `false`.
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final Matcher isBool = predicate((value) => value is bool, 'a bool');
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/// Asserts that a `String` complies to the RFC 5322 e-mail standard.
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final Matcher isEmail = predicate(
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(value) => value is String && _email.hasMatch(value),
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'a valid e-mail address');
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/// Asserts that a value is an `int`.
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final Matcher isInt = predicate((value) => value is int, 'an integer');
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/// Asserts that a value is a `num`.
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final Matcher isNum = predicate((value) => value is num, 'a number');
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/// Asserts that a value is a `String`.
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final Matcher isString = predicate((value) => value is String, 'a string');
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/// Asserts that a value is a non-empty `String`.
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final Matcher isNonEmptyString = predicate(
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(value) => value is String && value.trim().isNotEmpty,
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'a non-empty string');
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/// Asserts that a value, presumably from a checkbox, is positive.
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final Matcher isChecked =
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isIn(const ['yes', 'checked', 'on', '1', 1, 1.0, true, 'true']);
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/// Ensures that a string is an ISO-8601 date string.
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final Matcher isIso8601DateString = predicate(
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(x) {
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try {
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return x is String && DateTime.parse(x) != null;
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} catch (_) {
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return false;
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}
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},
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'a valid ISO-8601 date string.',
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);
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/// Asserts that a `String` is an `http://` or `https://` URL.
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///
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/// The regular expression used:
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/// ```
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/// https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,6}\b([-a-zA-Z0-9@:%_\+.~#?&//=]*)
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/// ```
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final Matcher isUrl = predicate(
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(value) => value is String && _url.hasMatch(value),
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'a valid url, starting with http:// or https://');
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/// Enforces a minimum length on a string.
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Matcher minLength(int length) => predicate(
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(value) => value is String && value.length >= length,
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'a string at least $length character(s) long');
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/// Limits the maximum length of a string.
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Matcher maxLength(int length) => predicate(
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(value) => value is String && value.length <= length,
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'a string no longer than $length character(s) long');
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