1 files changed, 125 insertions, 0 deletions
diff --git a/MediaBrowser.Common/Providers/ProviderIdParsers.cs b/MediaBrowser.Common/Providers/ProviderIdParsers.cs
new file mode 100644
index 000000000..64c2e1976
--- /dev/null
+++ b/MediaBrowser.Common/Providers/ProviderIdParsers.cs
@@ -0,0 +1,125 @@
+#nullable enable
+
+using System;
+using System.Diagnostics.CodeAnalysis;
+
+namespace MediaBrowser.Common.Providers
+{
+    /// <summary>
+    /// Parsers for provider ids.
+    /// </summary>
+    public static class ProviderIdParsers
+    {
+        private const int ImdbMinNumbers = 7;
+        private const int ImdbMaxNumbers = 8;
+        private const string ImdbPrefix = "tt";
+
+        /// <summary>
+        /// Parses an IMDb id from a string.
+        /// </summary>
+        /// <param name="text">The text to parse.</param>
+        /// <param name="imdbId">The parsed IMDb id.</param>
+        /// <returns>True if parsing was successful, false otherwise.</returns>
+        public static bool TryFindImdbId(ReadOnlySpan<char> text, [NotNullWhen(true)] out ReadOnlySpan<char> imdbId)
+        {
+            // imdb id is at least 9 chars (tt + 7 numbers)
+            while (text.Length >= 2 + ImdbMinNumbers)
+            {
+                var ttPos = text.IndexOf(ImdbPrefix);
+                if (ttPos == -1)
+                {
+                    imdbId = default;
+                    return false;
+                }
+
+                text = text.Slice(ttPos);
+                var i = 2;
+                var limit = Math.Min(text.Length, ImdbMaxNumbers + 2);
+                for (; i < limit; i++)
+                {
+                    var c = text[i];
+                    if (!IsDigit(c))
+                    {
+                        break;
+                    }
+                }
+
+                // skip if more than 8 digits + 2 chars for tt
+                if (i <= ImdbMaxNumbers + 2 && i >= ImdbMinNumbers + 2)
+                {
+                    imdbId = text.Slice(0, i);
+                    return true;
+                }
+
+                text = text.Slice(i);
+            }
+
+            imdbId = default;
+            return false;
+        }
+
+        /// <summary>
+        /// Parses an TMDb id from a movie url.
+        /// </summary>
+        /// <param name="text">The text with the url to parse.</param>
+        /// <param name="tmdbId">The parsed TMDb id.</param>
+        /// <returns>True if parsing was successful, false otherwise.</returns>
+        public static bool TryFindTmdbMovieId(ReadOnlySpan<char> text, [NotNullWhen(true)] out ReadOnlySpan<char> tmdbId)
+            => TryFindProviderId(text, "themoviedb.org/movie/", out tmdbId);
+
+        /// <summary>
+        /// Parses an TMDb id from a series url.
+        /// </summary>
+        /// <param name="text">The text with the url to parse.</param>
+        /// <param name="tmdbId">The parsed TMDb id.</param>
+        /// <returns>True if parsing was successful, false otherwise.</returns>
+        public static bool TryFindTmdbSeriesId(ReadOnlySpan<char> text, [NotNullWhen(true)] out ReadOnlySpan<char> tmdbId)
+            => TryFindProviderId(text, "themoviedb.org/tv/", out tmdbId);
+
+        /// <summary>
+        /// Parses an TVDb id from a url.
+        /// </summary>
+        /// <param name="text">The text with the url to parse.</param>
+        /// <param name="tvdbId">The parsed TVDb id.</param>
+        /// <returns>True if parsing was successful, false otherwise.</returns>
+        public static bool TryFindTvdbId(ReadOnlySpan<char> text, [NotNullWhen(true)] out ReadOnlySpan<char> tvdbId)
+            => TryFindProviderId(text, "thetvdb.com/?tab=series&id=", out tvdbId);
+
+        private static bool TryFindProviderId(ReadOnlySpan<char> text, ReadOnlySpan<char> searchString, [NotNullWhen(true)] out ReadOnlySpan<char> providerId)
+        {
+            var searchPos = text.IndexOf(searchString);
+            if (searchPos == -1)
+            {
+                providerId = default;
+                return false;
+            }
+
+            text = text.Slice(searchPos + searchString.Length);
+
+            int i = 0;
+            for (; i < text.Length; i++)
+            {
+                var c = text[i];
+
+                if (!IsDigit(c))
+                {
+                    break;
+                }
+            }
+
+            if (i >= 1)
+            {
+                providerId = text.Slice(0, i);
+                return true;
+            }
+
+            providerId = default;
+            return false;
+        }
+
+        private static bool IsDigit(char c)
+        {
+            return c >= '0' && c <= '9';
+        }
+    }
+}