h5 VS Roslyn

Or similar for c# with https://h5.rocks (disclaimer: author here)

A compiler is a program that can turn code written in one programming language into code written in another programming language. Like you say, they're used to convert code into machine code so that your computer can run it, but it's not limited to just that. They can be used to convert your code into any other programming language, even high-level ones. So you can totally compile your C# code into JavaScript if you're insane enough to do that.

It was recently forked into new project called h5: https://github.com/theolivenbaum/h5

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.

I like to use the roslyn coding practices for C# projects (https://github.com/dotnet/roslyn/blob/main/docs/wiki/Contributing-Code.md)