35 lines
857 B
Common Lisp
35 lines
857 B
Common Lisp
(in-package macro-utils)
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(defun test-while (n)
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(let ((i 0))
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(while (< i n)
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(format t "~a~%" i)
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(incf i))))
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(defun test-until (n)
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(let ((i 0))
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(until (= i n)
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(format t "~a~%" i)
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(incf i))))
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(defmacro while (test-case &body body)
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`(do ()
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((not ,test-case) t)
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,@body))
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(defmacro until (test-case &body body)
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`(do ()
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(,test-case t)
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,@body))
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(defmacro with-gensyms ((&rest names) &body body)
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`(let ,(loop for n in names collect `(,n (gensym)))
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,@body))
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(defmacro once-only ((&rest names) &body body)
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(let ((gensyms (loop for n in names collect (gensym))))
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`(let (,@(loop for g in gensyms collect `(,g (gensym))))
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`(let (,,@(loop for g in gensyms for n in names collect ``(,,g ,,n)))
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,(let (,@(loop for n in names for g in gensyms collect `(,n ,g)))
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,@body)))))
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