Added HDL (Hardware Description Language) support

[stephanmax]

I added support for the declarative Hardware Description Language used in the Coursera Nand2Tetris (https://phoenix.goucher.edu/~kelliher/f2015/cs220/hdlSurvivalGuide.pdf).

[RunDevelopment]

Thank you for contributing!

But there are a few things we will have to change before we can merge this.

1. Please choose a better name. There is no one HDL language.
2. Please correct the indentation of your tests.

[stephanmax]

Thanks for your feedback, @RunDevelopment. I applied all changes as requested. PS. Say Hi to my hometown Leipzig 😃

[RunDevelopment]

Nice work.

Wouldn't it be possible to use the C-like function here? I don't know if stuff like Not, And, and so on are called functions here but they do look like it.
And could you please also add an example page?

Also, is there a spec for this language?

[stephanmax]

The semantics behind And and Not is actually a bit different than the notion of functions. They have to be HDL scripts in the same folder with the same name. Actually, they could be called Bananarama as long as there is a Bananarama.hdl file next to it.

There is only an informal spec in the appendix of the course‘s accompanying book.

[RunDevelopment]

There is only an informal spec in the appendix of the course‘s accompanying book.

Well, can't do anything about that.

The semantics behind And and Not is actually a bit different than the notion of functions. They have to be HDL scripts in the same folder with the same name. Actually, they could be called Bananarama as long as there is a Bananarama.hdl file next to it.

So the function name has to relate to a file name (excluding builtins like And I suppose).
I think this pretty much falls within the concept of a function so can we land this feature?

[stephanmax]

So the function name has to relate to a file name (excluding builtins like And I suppose).
I think this pretty much falls within the concept of a function so can we land this feature?

You got me convinced! Yes, it is actually like a function 👍

[RunDevelopment]

Thank you for contributing!

[ghost]

It seems to me that components/prism-hdl.min.js shouldn’t have been committed.

[RunDevelopment]

Indeed! I'll fix it.