⚠️ Warning: This is a draft ⚠️This means it might contain formatting issues, incorrect code, conceptual problems, or other severe issues. If you want to help to improve and eventually enable this page, please fork RosettaGit's repository and open a merge request on GitHub. The interpreter (in [[Common Lisp]]) accepts a string, treated as program text, or a pathname object, in which case the contents of the file are the program text. (defun slurp (filespec) "Return the contents of the file as a string." (with-output-to-string (out) (with-open-file (in filespec :direction :input) (loop for line = (read-line in nil nil) until (null line) do (write-line line out))))) (defun hq9+ (input &optional (out *standard-output*)) "Execute the hq9+ program designated by input. If input is a string, it is taken as the program text. If it is a pathname, then the program text is the content of the file. The final value of the accumulator is returned." (loop with src = (if (stringp input) input (slurp input)) with accumulator = 0 for c across src do (case c (#\h (write-line "Hello, world!" out)) (#\q (write-string src out)) (#\+ (incf accumulator)) (#\9 (do ((n 99 (1- n))) ((zerop n)) (format out "~&~%~w bottle~:p of beer on the wall~%~ ~w bottle~:p of beer~%~ Take one down, pass it around~%~ ~:[~w bottle~:p~;No more bottles~] ~ of beer on the wall~%" n n (zerop (1- n)) n)) (format out "~&~%No more bottles of beer on the wall~%~ No more bottles of beer on the wall~%~ Go to the store and buy some more~%~ 99 bottles of beer on the wall.~%"))) finally (return accumulator)))