An overly-underengineered brainf**k interpreter in Swift
BrainflipKit is a Swift command-line app that interprets brainf**k programs.
If you're here, then chances are you already know what brainf**k is (if not, here's a quick and dirty reference). So instead of dwelling on the basics, I'll go over what makes this interpreter marginally unique.
- Full Unicode support. That's just what happens when you're using Swift.
- The cells are 32-bit instead of 8-bit, due to the aforementioned Unicode support. Most well-written brainf**k programs shouldn't be heavily affected by this.
- The tape is infinite in both directions.
- The end-of-input behavior is customizable -- you can ignore EOI, set the cell to 0, set the cell to its maximum, or throw an error. (Why you'd throw an error on EOI, I don't know, but the option is there for the taking.)
- Cell wrapping can be disabled (by throwing an error).
- Some relatively basic optimizations are performed, including:
- Condensing repeated instructions
- Merging
+/-and</>instructions (and removing pairs that cancel each other out) - Replacing
[-]with an instruction that directly clears the cell - Replacing copy loops and multiplication loops with a dedicated instruction
- Replacing scan loops (
[>],[<<<], etc.) with a dedicated instruction
- There are some extra instructions that can be enabled if you wish.