Following on my previous post where I showed how to add a new operator to C# and Roslyn today I’m going to describe how to make further progress on implementing matt operator:
[email protected]. I already extender the Lexer and Parser to understand that new language construct. The next step is to make Binder aware of our new operator, to make sure it can only be used in the right places and with the right types. We also need to teach the compiler that
<int> [email protected] <int> returns an
I read a very interesting blog post by Matt Warren yesterday morning: Adding a new Bytecode Instruction to the CLR. It was very eye-opening to see how easy it is to add a new instruction to .NET CLR. In his blogpost Matt started a challange about adding support for his new
matt operator into C# (Roslyn):
The other reason for naming it matt is that I’d really like someone to make a version of the C# (Roslyn) compiler that allows you to write code like this:
I definitely want the
[email protected]operator to be a thing (pronounced ‘matt’, not ‘m-at’), maybe the other ‘Matt Warren’ who works at Microsoft on the C# Language Design Team can help out!! Seriously though, if anyone reading this would like to write a similar blog post, showing how you’d add the
[email protected]operator to the Roslyn compiler, please let me know I’d love to read it.
Because I always wanted to learn more about Roslyn I decided to explore it a little bit and see how far I can get. I invite you to join me on that journey.
How many times in your code do you need to parse strings to primitive values? I would guess pretty often. How often do you use
TryParse method, to avoid unnecessary exception handling? The same guess – probably pretty often. How many times did you wish that
TryParse didn’t use out method parameter? Yes, the same answer again. But how many times did you think how to improve that scenario? Probably never. I think you should have done that! There is quite a lot of room for improvement here. Simple tricks that may make your parsing logic much simpler, cleaner and more verbatim.