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#nullable enable
using System;
using System.Diagnostics.CodeAnalysis;
namespace MediaBrowser.Common.Providers
{
/// <summary>
/// Parsers for provider ids.
/// </summary>
public static class ProviderIdParsers
{
/// <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(string text, [NotNullWhen(true)] out string? imdbId)
{
var span = text.AsSpan();
var tt = "tt".AsSpan();
while (true)
{
var ttPos = span.IndexOf(tt);
if (ttPos == -1)
{
imdbId = default;
return false;
}
span = span.Slice(ttPos + tt.Length);
int i = 0;
// IMDb id has a maximum of 8 digits
int max = span.Length > 8 ? 8 : span.Length;
for (; i < max; i++)
{
var c = span[i];
if (c < '0' || c > '9')
{
break;
}
}
// IMDb id has a minimum of 7 digits
if (i >= 7)
{
imdbId = string.Concat(tt, span.Slice(0, i));
return true;
}
}
}
/// <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(string 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(string 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(string text, [NotNullWhen(true)] out string? tvdbId)
=> TryParseProviderId(text, "thetvdb.com/?tab=series&id=", out tvdbId);
private static bool TryParseProviderId(string text, string searchString, [NotNullWhen(true)] out string? providerId)
{
var span = text.AsSpan();
var searchSpan = searchString.AsSpan();
while (true)
{
var searchPos = span.IndexOf(searchSpan);
if (searchPos == -1)
{
providerId = default;
return false;
}
span = span.Slice(searchPos + searchSpan.Length);
int i = 0;
for (; i < span.Length; i++)
{
var c = span[i];
if (c < '0' || c > '9')
{
break;
}
}
if (i >= 1)
{
providerId = span.Slice(0, i).ToString();
return true;
}
}
}
}
}
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