Pelle, sorry for the offtopic, but is it difficult to write your own compiler? What do you need to know for this?
Like any "large" program there are lots details, but each detail isn't necessarily that difficult.
One way to start is by looking at an already written compiler, for a programming language you understand. The more comments, the better...
Maybe search GitHub, or try a web search for "tiny" + "compiler" + ... for something to start with. Once you understand things better, you can do at new search with different terms/keywords. Most of what I have learned about compilers in recent years comes from web searches...