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use the builtin write and display handlers instead of the previous ones

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svn: r9620
This commit is contained in:
Eli Barzilay 2008-05-03 05:25:46 +00:00
parent 7738799556
commit d48e7501af
1 changed files with 49 additions and 51 deletions
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82
collects/swindle/extra.ss
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@ -433,8 +433,10 @@
(define* *print-level* (make-parameter 6))
(define* *print-length* (make-parameter 20))
(define orig-write-handler (port-write-handler (current-error-port)))
(define orig-display-handler (port-display-handler (current-error-port)))
;; grab the builtin write/display handlers
(define-values (mz:write mz:display)
(let ([p (open-output-bytes)])
(values (port-write-handler p) (port-display-handler p))))
;;>> (print-object obj esc? port)
;;> Prints `obj' on `port' using the above parameters -- the effect of
@ -450,22 +452,22 @@
(defgeneric* print-object (object esc? port))
(defmethod (print-object o esc? port)
(orig-display-handler "#" port)
(orig-display-handler (class-name (class-of o)) port))
(mz:display "#" port)
(mz:display (class-name (class-of o)) port))
(defmethod (print-object [o <builtin>] esc? port)
((if esc? orig-write-handler orig-display-handler) o port))
((if esc? mz:write mz:display) o port))
(define printer:too-deep "#?#")
(define printer:too-long "...")
(defmethod (print-object [o <pair>] esc? port)
(cond
[(null? o) (orig-display-handler "()" port)]
[(null? o) (mz:display "()" port)]
[(and (pair? (cdr o)) (null? (cddr o))
(memq (car o) '(quote quasiquote unquote unquote-splicing
syntax quasisyntax unsyntax unsyntax-splicing)))
(orig-display-handler (case (car o)
(mz:display (case (car o)
[(quote) "'"]
[(quasiquote) "`"]
[(unquote) ","]
@ -476,47 +478,43 @@
[(unsyntax-splicing) "#,@"])
port)
(print-object (cadr o) esc? port)]
[(eq? (*print-level*) 0)
(orig-display-handler printer:too-deep port)]
[(eq? (*print-level*) 0) (mz:display printer:too-deep port)]
[else
(orig-display-handler "(" port)
(mz:display "(" port)
(if (eq? (*print-length*) 0)
(orig-display-handler printer:too-long port)
(mz:display printer:too-long port)
(parameterize ([*print-level* (sub1 (or (*print-level*) 0))])
(print-object (car o) esc? port)
(do ([o (cdr o) (if (pair? o) (cdr o) '())]
[n (sub1 (or (*print-length*) 0)) (sub1 n)])
[(or (null? o)
(and (zero? n)
(begin (orig-display-handler " " port)
(orig-display-handler printer:too-long port)
(begin (mz:display " " port)
(mz:display printer:too-long port)
#t)))]
(if (pair? o)
(begin (orig-display-handler " " port)
(print-object (car o) esc? port))
(begin (orig-display-handler " . " port)
(print-object o esc? port))))))
(orig-display-handler ")" port)]))
(begin (mz:display " " port) (print-object (car o) esc? port))
(begin (mz:display " . " port) (print-object o esc? port))))))
(mz:display ")" port)]))
(defmethod (print-object [o <vector>] esc? port)
(cond [(eq? (*print-level*) 0)
(orig-display-handler printer:too-deep port)]
[(zero? (vector-length o)) (orig-display-handler "#()" port)]
[else (orig-display-handler "#(" port)
(cond [(eq? (*print-level*) 0) (mz:display printer:too-deep port)]
[(zero? (vector-length o)) (mz:display "#()" port)]
[else (mz:display "#(" port)
(if (eq? (*print-length*) 0)
(orig-display-handler printer:too-long port)
(mz:display printer:too-long port)
(parameterize ([*print-level* (sub1 (or (*print-level*) 0))])
(print-object (vector-ref o 0) esc? port)
(let ([len (if (*print-length*)
(min (vector-length o) (*print-length*))
(vector-length o))])
(do ([i 1 (add1 i)]) [(>= i len)]
(orig-display-handler " " port)
(mz:display " " port)
(print-object (vector-ref o i) esc? port))
(when (< len (vector-length o))
(orig-display-handler " " port)
(orig-display-handler printer:too-long port)))))
(orig-display-handler ")" port)]))
(mz:display " " port)
(mz:display printer:too-long port)))))
(mz:display ")" port)]))
;;>> (name-sans-<> name)
;;> Given a string or symbol for name, return a string where the outermost
@ -535,11 +533,11 @@
[cc (class-of c)]
[(name x) (name-sans-<> (slot-ref x 'name))])
(if (and (assq 'name (class-slots c)) (assq 'name (class-slots cc)))
(begin (orig-display-handler "#<" port)
(orig-display-handler (name c) port)
(orig-display-handler ":" port)
(orig-display-handler (name o) port)
(orig-display-handler ">" port))
(begin (mz:display "#<" port)
(mz:display (name c) port)
(mz:display ":" port)
(mz:display (name o) port)
(mz:display ">" port))
(call-next-method))))
;;>> (print-object-with-slots obj esc? port)
@ -549,26 +547,26 @@
;;> `print-object'.
(define* (print-object-with-slots o esc? port)
(if (eq? (*print-level*) 0)
(orig-display-handler printer:too-deep port)
(mz:display printer:too-deep port)
(let ([class (class-of o)])
(orig-display-handler "#<" port)
(orig-display-handler (name-sans-<> (class-name class)) port)
(orig-display-handler ":" port)
(mz:display "#<" port)
(mz:display (name-sans-<> (class-name class)) port)
(mz:display ":" port)
(parameterize ([*print-level* (sub1 (or (*print-level*) 0))])
(do ([s (class-slots class) (cdr s)]
[n (or (*print-length*) -1) (sub1 n)])
[(or (null? s)
(and (zero? n)
(begin (orig-display-handler " " port)
(orig-display-handler printer:too-long port))))]
(begin (mz:display " " port)
(mz:display printer:too-long port))))]
(let ([val (slot-ref o (caar s))])
(if (eq? ??? val)
(set! n (add1 n))
(begin (orig-display-handler " " port)
(orig-display-handler (caar s) port)
(orig-display-handler "=" port)
(begin (mz:display " " port)
(mz:display (caar s) port)
(mz:display "=" port)
(print-object val esc? port))))))
(orig-display-handler ">" port))))
(mz:display ">" port))))
;; Add a hook to make <class> so it will initialize a printer if given
(defmethod :after (initialize [c <class>] initargs)