gistfile1.lisp

(defun |#"-reader| (stream sub-char numarg)
  (declare (ignore sub-char numarg))
  (let (chars)
    (do ((prev (read-char stream) curr)
         (curr (read-char stream) (read-char stream)))
        ((and (char= prev #\") (char= curr #\#)))
      (push prev chars))
    (coerce (nreverse chars) 'string)))

(set-dispatch-macro-character #\# #\" #'|#"-reader|)

;#"Ceci est un message contenant un " et un /"#

(defun segment-reader (stream ch n)
  (if (> n 0)
    (let ((chars))
      (do ((curr (read-char stream)
                 (read-char stream)))
          ((char= ch curr))
        (push curr chars))
      (cons (coerce (nreverse chars) 'string)
            (segment-reader stream ch (- n 1))))))


(defun mkstr (&rest args)
  (with-output-to-string (s)
    (dolist (a args) (princ a s))))

(defun symb (&rest args)
  (values (intern (apply #'mkstr args))))

(defun group (source n)
  (if (zerop n) (error "zero length"))
  (labels ((rec (source acc)
             (let ((rest (nthcdr n source)))
               (if (consp rest)

                   (nreverse
                     (cons source acc))))))
    (if source (rec source nil) nil)))



(defun flatten (x)
  (labels ((rec (x acc)
             (cond ((null x) acc)
                   ((atom x) (cons x acc))
                   (t (rec
                        (car x)
                        (rec (cdr x) acc))))))
    (rec x nil)))

(defun g!-symbol-p (s)
  (and (symbolp s)
       (> (length (symbol-name s)) 2)
       (string= (symbol-name s)
                "G!"
                :start1 0
                :end1 2)))



(defmacro defmacro/g! (name args &rest body)
  (let ((syms (remove-duplicates
                (remove-if-not #'g!-symbol-p
                               (flatten body)))))
    `(defmacro ,name ,args
       (let ,(mapcar
               (lambda (s)
                 `(,s (gensym ,(subseq
                                 (symbol-name s)
                                 2))))
               syms)
         ,@body))))



(defun o!-symbol-p (s)
  (and (symbolp s)
       (> (length (symbol-name s)) 2)
       (string= (symbol-name s)
                "O!"
                :start1 0
                :end1 2)))

(defun o!-symbol-to-g!-symbol (s)
  (symb "G!"
        (subseq (symbol-name s) 2)))



(defmacro defmacro! (name args &rest body)
  (let* ((os (remove-if-not #'o!-symbol-p args))
         (gs (mapcar #'o!-symbol-to-g!-symbol os)))
    `(defmacro/g! ,name ,args
       `(let ,(mapcar #'list (list ,@gs) (list ,@os))
          ,(progn ,@body)))))

#+cl-ppcre
(defmacro! match-mode-ppcre-lambda-form (o!args)
 ``(lambda (,',g!str)
     (cl-ppcre:scan
       ,(car ,g!args)
       ,',g!str)))