An attempt to follow along with Jack Crenshaw's Let's build a compiler, with a few differences:

• The original is written in Turbo Pascal, but I know Scala better, so I'm porting as I go along. This leads to some fairly non-idiomatic Scala code, but I'm trying to stick fairly closely to the original.
• The original generates assembly language for the 68000, but my machine has an x64 processor, so I'm changing the output to be suitable for feeding into nasm, with the help of 0xAX's Say hello to x86_64 Assembly.

If you have sbt installed, you should be able to run this thing like this:

$ echo '3-5*2+6/2' | sbt --error run > expression.asm

If you have nasm installed, you can then generate an executable binary like this:

$ ./assemble.sh expression.asm

And then you can run the binary!

$ ./target/expression