113 lines
3.1 KiB
Dart
113 lines
3.1 KiB
Dart
import 'package:equatable/equatable.dart';
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import '../extensions/helpers_extension.dart';
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/// Encapsulates a valid YouTube playlist ID.
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class PlaylistId with EquatableMixin {
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static final _regMatchExp =
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RegExp(r'youtube\..+?/playlist.*?list=(.*?)(?:&|/|$)');
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static final _compositeMatchExp = RegExp(
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'https://www.youtube.com/watch?v=b8m9zhNAgKs&list=PL9tY0BWXOZFuFEG_GtOBZ8-8wbkH-NVAr');
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static final _shortCompositeMatchExp =
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RegExp(r'youtu\.be/.*?/.*?list=(.*?)(?:&|/|$)');
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static final _embedCompositeMatchExp =
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RegExp(r'youtube\..+?/embed/.*?/.*?list=(.*?)(?:&|/|$)');
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/// The playlist id as string.
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final String value;
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/// Initializes an instance of [PlaylistId]
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PlaylistId(String idOrUrl) : value = parsePlaylistId(idOrUrl) {
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if (value == null) {
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throw ArgumentError.value(idOrUrl, 'idOrUrl', 'Invalid url');
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}
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}
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/// Returns true if the given [playlistId] is valid.
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static bool validatePlaylistId(String playlistId) {
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playlistId = playlistId.toUpperCase();
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if (playlistId.isNullOrWhiteSpace) {
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return false;
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}
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// Watch later
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if (playlistId == 'WL') {
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return true;
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}
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// My mix playlist
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if (playlistId == 'RDMM') {
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return true;
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}
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if (!playlistId.startsWith('PL') &&
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!playlistId.startsWith('RD') &&
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!playlistId.startsWith('UL') &&
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!playlistId.startsWith('UU') &&
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!playlistId.startsWith('PU') &&
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!playlistId.startsWith('OL') &&
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!playlistId.startsWith('LL') &&
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!playlistId.startsWith('FL')) {
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return false;
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}
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if (playlistId.length < 13) {
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return false;
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}
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return !RegExp(r'[^0-9a-zA-Z_\-]').hasMatch(playlistId);
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}
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/// Parses a playlist [url] returning its id.
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/// If the [url] is a valid it is returned itself.
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static String parsePlaylistId(String url) {
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if (url.isNullOrWhiteSpace) {
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return null;
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}
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if (validatePlaylistId(url)) {
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return url;
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}
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var regMatch = _regMatchExp.firstMatch(url)?.group(1);
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if (!regMatch.isNullOrWhiteSpace && validatePlaylistId(regMatch)) {
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return regMatch;
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}
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var compositeMatch = _compositeMatchExp.firstMatch(url)?.group(1);
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if (!compositeMatch.isNullOrWhiteSpace &&
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validatePlaylistId(compositeMatch)) {
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return compositeMatch;
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}
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var shortCompositeMatch = _shortCompositeMatchExp.firstMatch(url)?.group(1);
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if (!shortCompositeMatch.isNullOrWhiteSpace &&
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validatePlaylistId(shortCompositeMatch)) {
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return shortCompositeMatch;
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}
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var embedCompositeMatch = _embedCompositeMatchExp.firstMatch(url)?.group(1);
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if (!embedCompositeMatch.isNullOrWhiteSpace &&
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validatePlaylistId(embedCompositeMatch)) {
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return embedCompositeMatch;
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}
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return null;
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}
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@override
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String toString() => value;
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/// Converts [obj] to a [PlaylistId] by calling .toString on that object.
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/// If it is already a [PlaylistId], [obj] is returned
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factory PlaylistId.fromString(dynamic obj) {
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if (obj is PlaylistId) {
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return obj;
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}
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return PlaylistId(obj.toString());
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}
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@override
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List<Object> get props => [value];
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}
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