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(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 generate (tokens)
`(progn
(setq buf "")
(eval ,(read-from-string
(concatenate 'string
(map
'string
#'(lambda (token)
(let ((token-type (first token))
(token-content (second token)))
(if (eql token-type 'string)
(format nil "~A"
`(setf buf (concatenate 'string buf ,token-content)))
token-content)))
tokens))))))
(setq res (generate (lex (read-all))))
(setq str (format t "~{~A~^ ~}" res))
; (princ str)
; (print (eval (read-from-string str)))
; (read-from-string (lex (read-all)))
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