(in-package #:cl-forth)

(defun interpret (input)
  (let ((tokens (split-sequence #\Space input))) ;; Assuming you have a tokenizing function
    (dolist (token tokens)
      (cond
        ((equal token ":")
         (setf *compile-mode* t))

        ((equal token ";")
         (setf *compile-mode* nil)
         ;; Store the definition in the dictionary
         (setf (gethash (car *current-definition*) *dictionary*)
               (cdr *current-definition*))
         (setf *current-definition* nil))

        (*compile-mode*
         (if (null *current-definition*)
             ;; First token is the name of the new word
             (setf *current-definition* (list token))
             ;; Subsequent tokens are the body of the word
             (push token (cdr *current-definition*))))
        (t
         (execute-word token))))))

(defun execute-word (token)
  (cond
    ((digit-char-p (elt token 0))
     ;; Push numbers onto the stack
     (push (parse-integer token) *stack*))
    ((gethash token *dictionary*)
     ;; If token is in dictionary, execute it
     (let ((definition (gethash token *dictionary*)))
       (if (functionp definition)
           ;; If it's a primitive word, just execute it
           (funcall definition)
           ;; If it's a user-defined word, interpret each token in it
           (dolist (word definition)
             (execute-word word)))))
    (t
     (error "Unknown word: ~A" token))))

;; Please incorporate the above interpret and execute-word with evaluate-token and evaluate-line below:
(defmethod evaluate-line ((obj interpreter))
  (let ((tokens (split-string #\Space (line-of obj))))
    (dolist (token tokens)
      (setf (current-token-of obj) token)
      (evaluate-token obj))))

(defmethod evaluate-token ((obj interpreter))
  (let* ((token (current-token-of obj))
         (words (words-of (state-of obj)))
         (dict-entry (gethash token words)))
    (if dict-entry
        (funcall dict-entry obj)
        (let ((parsed (ignore-errors (parse-integer token))))
          (if parsed
              (push-to-stack (stack-of obj) parsed)
              (signal 'unknown-word-error :token token))))))