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;; testen der macrofunktionen kapitel 8 |
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;; ------------------------------------ |
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;; 8.1 |
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;macro-function | defmacro |
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(and (macro-function 'push) T) |
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T |
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(and (macro-function 'member) T) |
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NIL |
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(defmacro arithmetic-if (test neg-form zero-form pos-form) |
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(let ((var (gensym))) |
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`(let ((,var ,test)) |
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(cond ((< ,var 0) ,neg-form) |
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((= ,var 0) ,zero-form) |
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(T ,pos-form))))) |
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arithmetic-if |
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(and (macro-function 'arithmetic-if) T) |
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T |
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(setf x 8) |
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8 |
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(arithmetic-if (- x 4)(- x)(LIST "ZERO") x) |
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8 |
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(setf x 4) |
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4 |
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(arithmetic-if (- x 4)(- x)(LIST "ZERO")x) |
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("ZERO") |
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(setf x 3) |
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3 |
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(arithmetic-if (- x 4)(- x)(LIST "ZERO")x) |
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-3 |
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(defmacro arithmetic-if (test neg-form &optional zero-form pos-form) |
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(let ((var (gensym))) |
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`(let ((,var ,test)) |
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(cond ((< ,var 0) ,neg-form) |
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((= ,var 0) ,zero-form) |
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(T ,pos-form))))) |
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arithmetic-if |
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(setf x 8) |
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8 |
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(arithmetic-if (- x 4)(- x)) |
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nil |
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(setf x 4) |
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4 |
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(arithmetic-if (- x 4)(- x)) |
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NIL |
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(setf x 3) |
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3 |
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(arithmetic-if (- x 4)(- x)) |
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-3 |
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(defmacro halibut ((mouth eye1 eye2) |
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((fin1 length1)(fin2 length2)) |
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tail) |
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`(list ,mouth ,eye1 ,eye2 ,fin1 ,length1 ,fin2 ,length2 ,tail)) |
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halibut |
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(setf m 'red-mouth |
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eyes '(left-eye . right-eye) |
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f1 '(1 2 3 4 5) |
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f2 '(6 7 8 9 0) |
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my-favorite-tail '(list of all parts of tail)) |
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(list of all parts of tail) |
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(halibut (m (car eyes)(cdr eyes)) |
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((f1 (length f1))(f2 (length f2))) |
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my-favorite-tail) |
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(RED-MOUTH LEFT-EYE RIGHT-EYE (1 2 3 4 5) 5 (6 7 8 9 0) 5 |
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(LIST OF ALL PARTS OF TAIL)) |
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;; 8.2 |
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; macroexpand | macroexpand-1 |
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