Calx is a simple calculator which uses the "lisp-syntax" for input. It's implemented with "real" lexer and parser generators for the purpose of a nice demo at the Berlin Erlang User Group.
If you have Elixir installed, compile the project with mix compile. If you don't have Elixir, follow the
installation instructions
Let's try the calculator!
$ iex -S mix
iex(1)> Calx.go '(+ 1 1)'
2
iex(2)> Calx.go '(- (+ 42))'
-42
iex(3)> Calx.go (+ 1 2 3 4 5 6 7 8 9)'
45
Run the tests:
mix test
The mix build tool has built-in support for compiling .xrl and
.yrl files. Just put the files in the src/ folder and mix will
do the right thing by default. It will generate Erlang modules, which
you can call from Elixir like so: :calx_lexer.string('(+ 1 2)').