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innerっぽい何か
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| (import (rnrs) (clos user) (clos core)) | |
| (define-class <generic-inner> (<generic>) ()) | |
| (define-method compute-applicable-methods ((gf <generic-inner>) args) | |
| `(,@(reverse! (call-next-method)) | |
| ;; add very bottom one | |
| ,(make-method (list <top>) | |
| (lambda (call-next-method o) "")))) | |
| (define-generic inner :class <generic-inner>) | |
| (define-method inner (o) (call-next-method)) | |
| (define-class <document> () ()) | |
| (define-class <report> (<document>) ()) | |
| (define-class <combine> (<report>) ()) | |
| (define-method inner ((o <document>)) | |
| (string-append "<doc>" | |
| (call-next-method) | |
| "</doc>")) | |
| (define-method inner ((o <report>)) | |
| (string-append "<title>foo</title>" | |
| "<summary>bar</summary>" | |
| "<body>" | |
| (call-next-method) | |
| "</body>")) | |
| (define-method inner ((o <combine>)) "hello") | |
| (define (xml o) (inner o)) | |
| (print (xml (make <document>))) | |
| ;; -> <doc></doc> | |
| (print (xml (make <report>))) | |
| ;; -> <doc><title>foo</title><summary>bar</summary><body></body></doc> | |
| (print (xml (make <combine>))) | |
| ;; -> <doc><title>foo</title><summary>bar</summary><body>hello</body></doc> |
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