57 lines
1.4 KiB
Dart
57 lines
1.4 KiB
Dart
import '../extensions/helpers_extension.dart';
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/// Encapsulates a valid YouTube user name.
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class Username {
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/// User name as string.
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final String value;
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/// Initializes an instance of [Username].
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Username(String urlOrUsername) : value = parseUsername(urlOrUsername) {
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if (value == null) {
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throw ArgumentError.value(
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urlOrUsername, 'urlOrUsername', 'Invalid username');
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}
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}
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/// Returns true if the given username is a valid username.
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static bool validateUsername(String name) {
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if (name.isNullOrWhiteSpace) {
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return false;
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}
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if (name.length > 20) {
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return false;
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}
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return !RegExp('[^0-9a-zA-Z]').hasMatch(name);
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}
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/// Parses a username from a url.
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static String parseUsername(String nameOrUrl) {
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if (nameOrUrl.isNullOrWhiteSpace) {
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return null;
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}
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if (validateUsername(nameOrUrl)) {
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return nameOrUrl;
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}
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var regMatch = RegExp(r'youtube\..+?/user/(.*?)(?:\?|&|/|$)')
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.firstMatch(nameOrUrl)
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?.group(1);
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if (!regMatch.isNullOrWhiteSpace && validateUsername(regMatch)) {
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return regMatch;
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}
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return null;
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}
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/// Converts [obj] to a [Username] by calling .toString on that object.
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/// If it is already a [Username], [obj] is returned
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factory Username.fromString(dynamic obj) {
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if (obj is Username) {
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return obj;
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}
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return Username(obj.toString());
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}
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}
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