Simple database: Difference between revisions
Content added Content deleted
(→{{header|Common Lisp}}: add default date) |
(→{{header|Common Lisp}}: handle non-numeric month values) |
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(cond ((endp database) nil) |
(cond ((endp database) nil) |
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(T (cons (cadr (assoc 'episodes (cdar database))) (get-latest (cdr database)))))) |
(T (cons (cadr (assoc 'episodes (cdar database))) (get-latest (cdr database)))))) |
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(defun cal->int (cal) |
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(cond ((integerp cal) cal) |
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(T (get-value cal '(('jan . 1) ('feb . 2) ('mar . 3) ('apr . 4) |
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('may . 5) ('jun . 6) ('jul . 7) ('aug . 8) |
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('sep . 9) ('oct . 10) ('nov . 11) ('dec . 12)))))) |
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(defun compare-date (a b) |
(defun compare-date (a b) |
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((null a) (not (null b))) |
((null a) (not (null b))) |
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((null b) nil) |
((null b) nil) |
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((= ( |
((= (cal->int (first a)) (cal->int (first b))) |
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(compare-date (rest a) (rest b))) |
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(t (< (cal->int (first a)) (cal->int (first b)))))) |
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(defun compare-by-date (a b) |
(defun compare-by-date (a b) |
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