实现MiraiCode

[Executor-Cheng]

close #2
先实现MiraiCodeReader
定义为ref struct, 暂将处理方法定义为Parse(NameHandler, ArgumentHandler)

将来考虑的:

• 添加特定的Exceptions
• 添加MiraiCodeWriter

性能测试结果:

BenchmarkDotNet=v0.12.1, OS=Windows 10.0.19042
Intel Core i9-10900KF CPU 4.90GHz, 1 CPU, 20 logical and 10 physical cores
.NET Core SDK=5.0.201
  [Host]     : .NET Core 5.0.4 (CoreCLR 5.0.421.11614, CoreFX 5.0.421.11614), X64 RyuJIT
  DefaultJob : .NET Core 5.0.4 (CoreCLR 5.0.421.11614, CoreFX 5.0.421.11614), X64 RyuJIT

Method	input	Mean	Error	StdDev
Parse	[mir(...)n"}] [719]	327.70 ns	0.727 ns	0.607 ns
Parse	[mirai:at:123456789]	30.78 ns	0.083 ns	0.078 ns
Parse	[mirai:atall]	24.31 ns	0.075 ns	0.070 ns
Parse	[mira(...)61]] [39]	37.89 ns	0.079 ns	0.066 ns

测试语句是new MiraiCodeReader(input).Parse(static _ => { }, static _ => { });

参考: mirai码规范