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Use ReadOnlySpan<char> and char.IsDigit

This commit is contained in:
David 2021-03-18 20:52:56 +01:00
parent 840eeff2af
commit 59641e5c76
1 changed files with 19 additions and 28 deletions
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47
MediaBrowser.Common/Providers/ProviderIdParsers.cs
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@ -19,27 +19,26 @@ namespace MediaBrowser.Common.Providers
/// <param name="text">The text to parse.</param> /// <param name="text">The text to parse.</param>
/// <param name="imdbId">The parsed IMDb id.</param> /// <param name="imdbId">The parsed IMDb id.</param>
/// <returns>True if parsing was successful, false otherwise.</returns> /// <returns>True if parsing was successful, false otherwise.</returns>
public static bool TryParseImdbId(string text, [NotNullWhen(true)] out string? imdbId) public static bool TryParseImdbId(ReadOnlySpan<char> text, [NotNullWhen(true)] out string? imdbId)
{ {
var span = text.AsSpan();
var tt = "tt".AsSpan(); var tt = "tt".AsSpan();
// imdb id is at least 9 chars (tt + 7 numbers) // imdb id is at least 9 chars (tt + 7 numbers)
while (span.Length >= 2 + ImdbMinNumbers) while (text.Length >= 2 + ImdbMinNumbers)
{ {
var ttPos = span.IndexOf(tt); var ttPos = text.IndexOf(tt);
if (ttPos == -1) if (ttPos == -1)
{ {
imdbId = default; imdbId = default;
return false; return false;
} }
span = span.Slice(ttPos + tt.Length); text = text.Slice(ttPos + tt.Length);
var i = 0; var i = 0;
for (; i < Math.Min(span.Length, ImdbMaxNumbers); i++) for (; i < Math.Min(text.Length, ImdbMaxNumbers); i++)
{ {
var c = span[i]; var c = text[i];
if (!IsDigit(c)) if (!char.IsDigit(c))
{ {
break; break;
} }
@ -48,11 +47,11 @@ namespace MediaBrowser.Common.Providers
// skip if more than 8 digits // skip if more than 8 digits
if (i <= ImdbMaxNumbers && i >= ImdbMinNumbers) if (i <= ImdbMaxNumbers && i >= ImdbMinNumbers)
{ {
imdbId = string.Concat(tt, span.Slice(0, i)); imdbId = string.Concat(tt, text.Slice(0, i));
return true; return true;
} }
span = span.Slice(i); text = text.Slice(i);
} }
imdbId = default; imdbId = default;
@ -65,7 +64,7 @@ namespace MediaBrowser.Common.Providers
/// <param name="text">The text with the url to parse.</param> /// <param name="text">The text with the url to parse.</param>
/// <param name="tmdbId">The parsed TMDb id.</param> /// <param name="tmdbId">The parsed TMDb id.</param>
/// <returns>True if parsing was successful, false otherwise.</returns> /// <returns>True if parsing was successful, false otherwise.</returns>
public static bool TryParseTmdbMovieId(string text, [NotNullWhen(true)] out string? tmdbId) public static bool TryParseTmdbMovieId(ReadOnlySpan<char> text, [NotNullWhen(true)] out string? tmdbId)
=> TryParseProviderId(text, "themoviedb.org/movie/", out tmdbId); => TryParseProviderId(text, "themoviedb.org/movie/", out tmdbId);
/// <summary> /// <summary>
@ -74,7 +73,7 @@ namespace MediaBrowser.Common.Providers
/// <param name="text">The text with the url to parse.</param> /// <param name="text">The text with the url to parse.</param>
/// <param name="tmdbId">The parsed TMDb id.</param> /// <param name="tmdbId">The parsed TMDb id.</param>
/// <returns>True if parsing was successful, false otherwise.</returns> /// <returns>True if parsing was successful, false otherwise.</returns>
public static bool TryParseTmdbSeriesId(string text, [NotNullWhen(true)] out string? tmdbId) public static bool TryParseTmdbSeriesId(ReadOnlySpan<char> text, [NotNullWhen(true)] out string? tmdbId)
=> TryParseProviderId(text, "themoviedb.org/tv/", out tmdbId); => TryParseProviderId(text, "themoviedb.org/tv/", out tmdbId);
/// <summary> /// <summary>
@ -83,29 +82,26 @@ namespace MediaBrowser.Common.Providers
/// <param name="text">The text with the url to parse.</param> /// <param name="text">The text with the url to parse.</param>
/// <param name="tvdbId">The parsed TVDb id.</param> /// <param name="tvdbId">The parsed TVDb id.</param>
/// <returns>True if parsing was successful, false otherwise.</returns> /// <returns>True if parsing was successful, false otherwise.</returns>
public static bool TryParseTvdbId(string text, [NotNullWhen(true)] out string? tvdbId) public static bool TryParseTvdbId(ReadOnlySpan<char> text, [NotNullWhen(true)] out string? tvdbId)
=> TryParseProviderId(text, "thetvdb.com/?tab=series&id=", out tvdbId); => TryParseProviderId(text, "thetvdb.com/?tab=series&id=", out tvdbId);
private static bool TryParseProviderId(string text, string searchString, [NotNullWhen(true)] out string? providerId) private static bool TryParseProviderId(ReadOnlySpan<char> text, ReadOnlySpan<char> searchString, [NotNullWhen(true)] out string? providerId)
{ {
var span = text.AsSpan(); var searchPos = text.IndexOf(searchString);
var searchSpan = searchString.AsSpan();
var searchPos = span.IndexOf(searchSpan);
if (searchPos == -1) if (searchPos == -1)
{ {
providerId = default; providerId = default;
return false; return false;
} }
span = span.Slice(searchPos + searchSpan.Length); text = text.Slice(searchPos + searchString.Length);
int i = 0; int i = 0;
for (; i < span.Length; i++) for (; i < text.Length; i++)
{ {
var c = span[i]; var c = text[i];
if (!IsDigit(c)) if (!char.IsDigit(c))
{ {
break; break;
} }
@ -113,17 +109,12 @@ namespace MediaBrowser.Common.Providers
if (i >= 1) if (i >= 1)
{ {
providerId = span.Slice(0, i).ToString(); providerId = text.Slice(0, i).ToString();
return true; return true;
} }
providerId = default; providerId = default;
return false; return false;
} }
private static bool IsDigit(char c)
{
return c >= '0' && c <= '9';
}
} }
} }