Cursively VS Roslyn

I was looking at the CSV parser Cursively recently, and I think it is a good simple example of a high performance C# parser and API design.

https://github.com/airbreather/Cursively

Agreed, and agreed. #21 and #22 seek to address this, but these have actually been very low priority for me: as your benchmarks show, if you primarily need a bunch of objects that must be UTF-16 strings, then are other libraries out there that will do the job just fine. The main reason to use Cursively for that would be if you have some use cases where you need the unusual qualities that Cursively offers, but other use cases where you can live with something more traditional, and you don't want to have two different CSV processing libraries.

The usage instructions are in the README on https://github.com/airbreather/Cursively. The most straightforward way to get started (for now) is:

My understanding is that the .NET team is working toward this with Interceptors: https://github.com/dotnet/roslyn/blob/main/docs/features/int...

.NET is a little smarter about switch code generation these days: https://github.com/dotnet/roslyn/pull/66081

Recently, while creating some experimental C# source code generators (xafero/csharp-generators), I was just concatenating strings together. Like you do, you know, if things have to go very quickly. If you have a simple use case, use a formatted multi-line string or some template library like scriban. But I searched for a way to generate more and more complicated logic easily - like for example, adding raw SQL handler methods to my pre-generated DBSet-like classes for my ADO.NET experiment. You could now say: Use Roslyn and that's really fine if you look everything up in a website like SharpLab, which shows immediately the syntax tree of our C# code.

At runtime, the Case C# expressions are embedded into a function and dynamically compiled into an assembly using the Roslyn C# compiler. Then the function that contains the expression is called (e.g. CaseAvailableFunction.Availablle()). At runtime, the function provides various methods to access stored case values as well as the current input data.