trie.cs

trie.cs

using BenchmarkDotNet.Attributes;
using System;
using System.Collections.Generic;
using System.Runtime.CompilerServices;

public class Program
{
    public static void Main()
    {
        BenchmarkDotNet.Running.BenchmarkRunner.Run<Program>();
    }

    public static IEnumerable<string> TestData()
    {
        yield return "system.void";
        yield return "system.v3id";
        yield return "system.char";
        yield return "system.Char";
        yield return "system.byte";
        yield return "system.bytt";
        yield return "system.int16";
        yield return "system.int32";
        yield return "system.int64";
        yield return "system.sbyte";
        yield return "system.uint16";
        yield return "system.uint32";
        yield return "system.uint64";
        yield return "system.single";
        yield return "system.double";
        yield return "system.string";
        yield return "system.object";
        yield return "system.decimal";
        yield return "system.boolean";
        yield return "system.boolean";
        yield return "system.booleaen";
    }

    [ArgumentsSource(nameof(TestData))]
    [Benchmark(Baseline = true)]
    public string? GetShortName_opt(string str)
    {
        switch (str.Length - 11)
        {
            case 0:
                switch (str[7])
                {
                    case 'v': return (str == "system.void" ? "void" : null);
                    case 'c': return (str == "system.char" ? "char" : null);
                    case 'b': return (str == "system.byte" ? "byte" : null);
                    default: return null;
                }
            case 1:
                switch (str[10])
                {
                    case '1': return (str == "system.int16" ? "short" : null);
                    case '3': return (str == "system.int32" ? "int" : null);
                    case '6': return (str == "system.int64" ? "long" : null);
                    case 't': return (str == "system.sbyte" ? "sbyte" : null);
                    default: return null;
                }
            case 2:
                switch (str[8])
                {
                    case 'i': return (str == "system.single" ? "float" : null);
                    case 'o': return (str == "system.double" ? "double" : null);
                    case 't': return (str == "system.string" ? "string" : null);
                    case 'b': return (str == "system.object" ? "object" : null);
                    default: return null;
                }
            case 3:
                return str == "system.boolean" ? "bool" : null;
        }
        return null;
    }

    [ArgumentsSource(nameof(TestData))]
    [Benchmark]
    public string? GetShortName(string str)
    {
        switch (str)
        {
            case "system.int16":
                return "short";
            case "system.int32":
                return "int";
            case "system.int64":
                return "long";
            case "system.string":
                return "string";
            case "system.object":
                return "object";
            case "system.boolean":
                return "bool";
            case "system.void":
                return "void";
            case "system.char":
                return "char";
            case "system.byte":
                return "byte";
            case "system.sbyte":
                return "sbyte";
            case "system.single":
                return "float";
            case "system.double":
                return "double";
        }
        return null;
    }
}