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need to use ephemerons with weak table of ports

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svn: r2548
This commit is contained in:
Matthew Flatt 2006-03-31 00:25:38 +00:00
parent 940fbc81a9
commit 2ca4121a4f
1 changed files with 10 additions and 8 deletions
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18
collects/mzlib/pretty.ss
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@ -308,19 +308,21 @@
esc))
(define (register-printing-port p info)
(hash-table-put! printing-ports p info))
(hash-table-put! printing-ports p (make-ephemeron p info)))
(define (register-printing-port-like p pport)
(hash-table-put! printing-ports p
(hash-table-get printing-ports pport)))
(make-ephemeron p
(ephemeron-value (hash-table-get printing-ports pport)))))
(define (get pport selector)
(selector (hash-table-get printing-ports pport
(lambda ()
(make-print-port-info
(lambda () null)
(box #t)
void void void void void)))))
(let ([e (hash-table-get printing-ports pport (lambda () #f))])
(selector (if e
(ephemeron-value e)
(make-print-port-info
(lambda () null)
(box #t)
void void void void void)))))
(define (printing-port-pre-print pport)
(get pport print-port-info-pre-print))