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jellyfin/MediaBrowser.Common/Providers/ProviderIdParsers.cs

126 lines
4.1 KiB

#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;
/// <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 TryParseImdbId(ReadOnlySpan<char> text, [NotNullWhen(true)] out string? imdbId)
{
var tt = "tt".AsSpan();
// imdb id is at least 9 chars (tt + 7 numbers)
while (text.Length >= 2 + ImdbMinNumbers)
{
var ttPos = text.IndexOf(tt);
if (ttPos == -1)
{
imdbId = default;
return false;
}
text = text.Slice(ttPos + tt.Length);
var i = 0;
for (; i < Math.Min(text.Length, ImdbMaxNumbers); i++)
{
var c = text[i];
if (!IsDigit(c))
{
break;
}
}
// skip if more than 8 digits
if (i <= ImdbMaxNumbers && i >= ImdbMinNumbers)
{
imdbId = string.Concat(tt, 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 TryParseTmdbMovieId(ReadOnlySpan<char> text, [NotNullWhen(true)] out string? tmdbId)
=> TryParseProviderId(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 TryParseTmdbSeriesId(ReadOnlySpan<char> text, [NotNullWhen(true)] out string? tmdbId)
=> TryParseProviderId(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 TryParseTvdbId(ReadOnlySpan<char> text, [NotNullWhen(true)] out string? tvdbId)
=> TryParseProviderId(text, "thetvdb.com/?tab=series&id=", out tvdbId);
private static bool TryParseProviderId(ReadOnlySpan<char> text, ReadOnlySpan<char> searchString, [NotNullWhen(true)] out string? 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).ToString();
return true;
}
providerId = default;
return false;
}
private static bool IsDigit(char c)
{
return c >= '0' && c <= '9';
}
}
}