実践Common Lispを読んでみる

と言う訳で↓

実践Common Lisp

26ページくらいまで読みながら写してみる。
感想

• 日本語のリテラル通らない。よくわからない。"coding system iso-latin-1-unix not suitable for..."とかエラーが出る。とりあえず放置。
• formatよくわからない。…まあそのうち。
• readすごい。

続きはソースコード。

(defun make-cd (title artist rating ripped)
  (list :title title :artist artist :rating rating :ripped ripped))
(defvar *db* nil)
(defun add-record (cd) (push cd *db*))
;(add-record (make-cd "test" "title" 2 nil))
;(add-record (make-cd "test2" "sample" 3 nil))
(defun dump-db ()
  (dolist (cd *db*)
    (format t "~{~a:~10t~a~%~}~%" cd)))
;(format t "~a" "Dixie Chicks")
;(format t "~a" :title)
;(defun dump-db ()
;  (format t "~{~{~a:~10t~a~%~}~%~}" *db*))
(defun prompt-read (prompt)
  (format *query-io* "~a: " prompt)
  (force-output *query-io*)
  (read-line *query-io*))
(defun prompt-for-cd ()
  (make-cd
   (prompt-read "Title")
   (prompt-read "Artist")
   (or (parse-integer(prompt-read "Rating") :junk-allowed t) 0)
   (y-or-n-p "Ripped [y/n]")))
(defun add-cds ()
  (loop (add-record (prompt-for-cd))
     (if (not (y-or-n-p "Another? [y/n]: ")) (return))))
(defun save-db (filename)
  (with-open-file (out filename
		       :direction :output
		       :if-exists :supersede)
    (with-standard-io-syntax
      (print *db* out))))
(defun load-db (filename)
  (with-open-file (in filename)
    (with-standard-io-syntax
      (setf *db* (read in)))))

ファイルは↓
http://dl.getdropbox.com/u/228440/veleno-samples/lisp-samples/sample.lisp