They're All Named Johann

Johann is a comical attempt at building a programming platform from scratch for arm64-apple-darwin (aka Apple Silicon, with macOS). You don't want to use it. You don't even want to look at the source. When a bored coder has a martini (or several...) and decides to single-handedly reinvent much of the past ~60 years of computer science from scratch, nothing good results.

The only pre-existing software tools assumed are GCC's assembler and linker. No recognizer generator (e.g., lex and yacc), no v1 compiler in an existing language (e.g., C or Rust), no compiler backend (e.g., LLVM or GCC) for codegen, and no system libraries. Plus, I suppose, macOS itself along with its command shell and text editor.

This is clearly a ridiculous undertaking. The nominal goal is to get this fall's Advent of Code stars using only Johann, with a fully self-hosted compiler (no lingering assembly, aside from syscalls). The compiler itself already meets this requirement, but the system library it's built atop does not.

The Short Version

Clone and compile a test program as below. You'll need the command-line developer/Xcode tools installed.

git clone git@github.com:barneyb/johann.git
cd johann
./bin/jnc < not_quite_lisp.jn > not_quite_lisp.s
gcc not_quite_lisp.s ./lib/jstdlib.o
echo "((()))))(((((" | ./a.out

This will print:

Part A: 3
Part B: 7

The 3 is the difference in number of ( and ), and the 7 is the first character position (one-indexed) where more ) than ( have been encountered. Run make not_quite_lisp from the root to do basically the same thing.