mes/syntax.mes

;; (display "define-syntax...")

;; (define-macro define-syntax
;;   (lambda (form expander)
;;     (expander `(define-macro ,(cadr form)
;;                  (let ((transformer ,(caddr form)))
;;                    (lambda (form expander)
;;                      (expander (transformer form
;;                                             (lambda (x) x)
;;                                             eq?)
;;                                expander))))
;;               expander)))

;; (newline)

(display "define-syntax when...")

;; (define-syntax when
;;   (syntax-rules ()
;;     ((when condition exp ...)
;;      (if condition
;;          (begin exp ...)))))

;; (define-macro (when cond exp . rest)
;;   `(if ,cond
;;        (begin ,exp . ,rest)))


;; (define-macro (when clause . rest)
;;   (list 'cond (list clause (list 'let '() rest))))


(define-macro (when expr . body)
  `(if ,expr
       ((lambda () ,@body))
       'bah))

(newline)

(when #t
  (display "true")
  (newline))

(when #t
  (display "q-when")
  (newline)
  '())

(define *gensym* 0)
(define (gensym)
  (set! *gensym* (+ *gensym* 1))
  (string->symbol (string-append "g" (number->string *gensym*))))

(newline)