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Use ReadOnlySpan<char> and char.IsDigit

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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="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)
public static bool TryParseImdbId(ReadOnlySpan<char> text, [NotNullWhen(true)] out string? imdbId)
{
var span = text.AsSpan();
var tt = "tt".AsSpan();
// 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)
{
imdbId = default;
return false;
}
span = span.Slice(ttPos + tt.Length);
text = text.Slice(ttPos + tt.Length);
var i = 0;
for (; i < Math.Min(span.Length, ImdbMaxNumbers); i++)
for (; i < Math.Min(text.Length, ImdbMaxNumbers); i++)
{
var c = span[i];
if (!IsDigit(c))
var c = text[i];
if (!char.IsDigit(c))
{
break;
}
@ -48,11 +47,11 @@ namespace MediaBrowser.Common.Providers
// skip if more than 8 digits
if (i <= ImdbMaxNumbers && i >= ImdbMinNumbers)
{
imdbId = string.Concat(tt, span.Slice(0, i));
imdbId = string.Concat(tt, text.Slice(0, i));
return true;
}
span = span.Slice(i);
text = text.Slice(i);
}
imdbId = default;
@ -65,7 +64,7 @@ namespace MediaBrowser.Common.Providers
/// <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)
public static bool TryParseTmdbMovieId(ReadOnlySpan<char> text, [NotNullWhen(true)] out string? tmdbId)
=> TryParseProviderId(text, "themoviedb.org/movie/", out tmdbId);
/// <summary>
@ -74,7 +73,7 @@ namespace MediaBrowser.Common.Providers
/// <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)
public static bool TryParseTmdbSeriesId(ReadOnlySpan<char> text, [NotNullWhen(true)] out string? tmdbId)
=> TryParseProviderId(text, "themoviedb.org/tv/", out tmdbId);
/// <summary>
@ -83,29 +82,26 @@ namespace MediaBrowser.Common.Providers
/// <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)
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(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 searchSpan = searchString.AsSpan();
var searchPos = span.IndexOf(searchSpan);
var searchPos = text.IndexOf(searchString);
if (searchPos == -1)
{
providerId = default;
return false;
}
span = span.Slice(searchPos + searchSpan.Length);
text = text.Slice(searchPos + searchString.Length);
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;
}
@ -113,17 +109,12 @@ namespace MediaBrowser.Common.Providers
if (i >= 1)
{
providerId = span.Slice(0, i).ToString();
providerId = text.Slice(0, i).ToString();
return true;
}
providerId = default;
return false;
}
private static bool IsDigit(char c)
{
return c >= '0' && c <= '9';
}
}
}