(defun read-all ()
  (let ((line (read-line *standard-input* nil)))
    (if line
      (concatenate 'string line '(#\linefeed) (read-all))
      "")))


(defconstant +temper-open+ "<%")
(defconstant +temper-close+ "%>")
(defconstant +temper-close-len+ (length +temper-close+))

(defun lex (input)
  (let ((pos (search +temper-open+ input)))
    (if (null pos)
      (list (list 'string input))
      (let* ((before    (subseq input 0 pos))
             (input     (subseq input pos))
             (end-pos   (search +temper-close+ input))
             (code      (subseq input +temper-close-len+ end-pos))
             (input     (subseq input (+ end-pos +temper-close-len+))))
        (append (list (list 'string before) (list 'code code)) (lex input))))))


(defun tokens-to-code-string (tokens)
  (apply #'concatenate 'string
    (map
      'list
      #'(lambda (token)
         (let ((token-type    (first token))
               (token-content (second token)))
             (if (eql token-type 'string)
               (format nil "~S"
                 `(setf buf (concatenate
                              'string
                              buf
                             ,(string-trim '(#\linefeed #\space) token-content)
                             '(#\linefeed))))
                token-content)))
      tokens)))

(defun generate (tokens)
  `(progn
    (setq buf "")
    (eval ,(read-from-string
      (concatenate 'string
        "(progn "
        (tokens-to-code-string tokens)
        ")")))))



(setq res (generate (lex (read-all))))
(format t "~A" (eval res))
; (setq str (format t "~{~S~^ ~}" res))



; (princ str)

; (print (eval (read-from-string str)))

; (read-from-string (lex (read-all)))