Kavita/Kavita.Benchmark/ParserBenchmarks.cs

using System.Text.RegularExpressions;
using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Order;

namespace Kavita.Benchmark;

[MemoryDiagnoser]
[Orderer(SummaryOrderPolicy.FastestToSlowest)]
[RankColumn]
public class ParserBenchmarks
{
    private readonly IList<string> _names;

    private static readonly Regex NormalizeRegex = new Regex(@"[^a-zA-Z0-9]",
        RegexOptions.IgnoreCase | RegexOptions.Compiled,
        TimeSpan.FromMilliseconds(300));

    private static readonly Regex IsEpub = new Regex(@"\.epub",
        RegexOptions.IgnoreCase | RegexOptions.Compiled,
        TimeSpan.FromMilliseconds(300));

    public ParserBenchmarks()
    {
        // Read all series from SeriesNamesForNormalization.txt
        _names = File.ReadAllLines("Data/SeriesNamesForNormalization.txt");
        Console.WriteLine($"Performing benchmark on {_names.Count} series");
    }

    private static string Normalize(string name)
    {
        // ReSharper disable once UnusedVariable
        var ret = NormalizeRegex.Replace(name, string.Empty).ToLower();
        var normalized = NormalizeRegex.Replace(name, string.Empty).ToLower();
        return string.IsNullOrEmpty(normalized) ? name : normalized;
    }



    [Benchmark]
    public void TestNormalizeName()
    {
        foreach (var name in _names)
        {
            Normalize(name);
        }
    }


    [Benchmark]
    public void TestIsEpub()
    {
        foreach (var name in _names)
        {
            if ((name).ToLower() == ".epub")
            {
                /* No Operation */
            }
        }
    }

    [Benchmark]
    public void TestIsEpub_New()
    {
        foreach (var name in _names)
        {

            if (Path.GetExtension(name).Equals(".epub", StringComparison.InvariantCultureIgnoreCase))
            {
                /* No Operation */
            }
        }
    }

    [Benchmark]
    public void Test_CharacterReplace()
    {
        foreach (var name in _names)
        {
            var d = name.Contains('a');
        }
    }

    [Benchmark]
    public void Test_StringReplace()
    {
        foreach (var name in _names)
        {

            var d = name.Contains("a");
        }
    }


}