ikarus/scheme/ikarus.writer.ss

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;;; Ikarus Scheme -- A compiler for R6RS Scheme.
;;; Copyright (C) 2006,2007 Abdulaziz Ghuloum
;;;
;;; This program is free software: you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License version 3 as
;;; published by the Free Software Foundation.
;;;
;;; This program is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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(library (ikarus writer)
(export write display format printf fprintf print-error print-unicode print-graph)
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(import
(rnrs hashtables)
(ikarus system $chars)
(ikarus system $strings)
(ikarus system $vectors)
(ikarus system $fx)
(ikarus system $pairs)
(ikarus system $symbols)
(ikarus system $bytevectors)
(ikarus system $transcoders)
(only (ikarus unicode-data) unicode-printable-char?)
(except (ikarus)
write display format printf fprintf print-error print-unicode print-graph))
(define print-unicode
(make-parameter #t))
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(define char-table ; first nonprintable chars
'#("nul" "x1" "x2" "x3" "x4" "x5" "x6" "alarm"
"backspace" "tab" "linefeed" "vtab" "page" "return" "xE" "xF"
"x10" "x11" "x12" "x13" "x14" "x15" "x16" "x17"
"x18" "x19" "x1A" "esc" "x1C" "x1D" "x1E" "x1F"
"space"))
(define write-positive-hex-fx
(lambda (n p)
(unless ($fx= n 0)
(write-positive-hex-fx ($fxsra n 4) p)
(let ([n ($fxlogand n #xF)])
(cond
[($fx<= n 9)
(write-char ($fixnum->char
($fx+ ($char->fixnum #\0) n))
p)]
[else
(write-char ($fixnum->char
($fx+ ($char->fixnum #\A) ($fx- n 10)))
p)])))))
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(define write-character
(lambda (x p m)
(if m
(let ([i ($char->fixnum x)])
(write-char #\# p)
(cond
[(fx< i (vector-length char-table))
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(write-char #\\ p)
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(write-char* (vector-ref char-table i) p)]
[(fx< i 127)
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(write-char #\\ p)
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(write-char x p)]
[(fx= i 127)
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(write-char #\\ p)
(write-char* "delete" p)]
[(and (print-unicode) (unicode-printable-char? x))
(write-char #\\ p)
(write-char x p)]
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[else
(write-char #\\ p)
(write-char #\x p)
(write-positive-hex-fx i p)]))
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(write-char x p))))
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(define write-list
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(lambda (x p m h i)
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(cond
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[(and (pair? x)
(or (not (hashtable-ref h x #f))
(fxzero? (hashtable-ref h x 0))))
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(write-char #\space p)
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(write-list (cdr x) p m h
(writer (car x) p m h i))]
[(null? x) i]
[else
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(write-char #\space p)
(write-char #\. p)
(write-char #\space p)
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(writer x p m h i)])))
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(define write-vector
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(lambda (x p m h i)
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(write-char #\# p)
(write-char #\( p)
(let ([n (vector-length x)])
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(let ([i
(cond
[(fx> n 0)
(let f ([idx 1] [i (writer (vector-ref x 0) p m h i)])
(cond
[(fx= idx n)
i]
[else
(write-char #\space p)
(f (fxadd1 idx)
(writer (vector-ref x idx) p m h i))]))]
[else i])])
(write-char #\) p)
i))))
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(define write-bytevector
(lambda (x p m h i)
(write-char #\# p)
(write-char #\v p)
(write-char #\u p)
(write-char #\8 p)
(write-char #\( p)
(let ([n ($bytevector-length x)])
(when (fx> n 0)
(write-fixnum ($bytevector-u8-ref x 0) p)
(let f ([idx 1] [n n] [x x] [p p])
(unless ($fx= idx n)
(write-char #\space p)
(write-fixnum ($bytevector-u8-ref x idx) p)
(f (fxadd1 idx) n x p)))))
(write-char #\) p)
i))
(define write-struct
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(lambda (x p m h i)
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(write-char #\# p)
(write-char #\[ p)
(let ([i (writer (struct-name x) p m h i)])
(let ([n (struct-length x)])
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(let f ([idx 0] [i i])
(cond
[(fx= idx n)
(write-char #\] p)
i]
[else
(write-char #\space p)
(f (fxadd1 idx)
(writer (struct-ref x idx) p m h i))]))))))
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(define initial?
(lambda (c)
(or (letter? c) (special-initial? c))))
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(define letter?
(lambda (c)
(or (and ($char<= #\a c) ($char<= c #\z))
(and ($char<= #\A c) ($char<= c #\Z)))))
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(define digit?
(lambda (c)
(and ($char<= #\0 c) ($char<= c #\9))))
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(define special-initial?
(lambda (x)
(memq x '(#\! #\$ #\% #\& #\* #\/ #\: #\< #\= #\> #\? #\^ #\_ #\~))))
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(define subsequent?
(lambda (x)
(or (initial? x)
(digit? x)
(special-subsequent? x))))
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(define special-subsequent?
(lambda (x)
(memq x '(#\+ #\- #\. #\@))))
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(define subsequent*?
(lambda (str i n)
(or ($fx= i n)
(and (subsequent? ($string-ref str i))
(subsequent*? str ($fxadd1 i) n)))))
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(define peculiar-symbol-string?
(lambda (str)
(let ([n (string-length str)])
(cond
[(fx= n 1)
(memq (string-ref str 0) '(#\+ #\-))]
[(fx>= n 2)
(or (and (char=? (string-ref str 0) #\-)
(char=? (string-ref str 1) #\>)
(subsequent*? str 2 n))
(string=? str "..."))]
[else #f]))))
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(define valid-symbol-string?
(lambda (str)
(define normal-symbol-string?
(lambda (str)
(let ([n ($string-length str)])
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(and ($fx>= n 1)
(initial? ($string-ref str 0))
(subsequent*? str 1 n)))))
(or (normal-symbol-string? str)
(peculiar-symbol-string? str))))
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(define write-symbol-bar-esc-loop
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(lambda (x i n p)
(unless ($fx= i n)
(let* ([c ($string-ref x i)]
[b ($char->fixnum c)])
(cond
[($fx< b 32)
(cond
[($fx< b 7)
(write-inline-hex b p)]
[($fx< b 14)
(write-char #\\ p)
(write-char (string-ref "abtnvfr" ($fx- b 7)) p)]
[else
(write-inline-hex b p)])]
[(memq c '(#\\ #\|))
(write-char #\\ p)
(write-char c p)]
[($fx< b 127)
(write-char c p)]
[else
(write-inline-hex b p)]))
(write-symbol-bar-esc-loop x ($fxadd1 i) n p))))
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(define write-symbol-bar-esc
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(lambda (x p)
(write-char #\| p)
(write-symbol-bar-esc-loop x 0 ($string-length x) p)
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(write-char #\| p)))
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(define-syntax ascii-map
(lambda (x)
;;; r6rs prohibits bytevectors from being "datum"s
;;; oh well.
(syntax-case x ()
[(stx str) (string? (syntax->datum #'str))
(let ([s (syntax->datum #'str)]
[bv (make-bytevector 16 0)])
(for-each
(lambda (c)
(let ([b (char->integer c)])
(let ([i (fxlogand b 7)]
[j (fxsra b 3)])
(bytevector-u8-set! bv j
(fxlogor (bytevector-u8-ref bv j)
(fxsll 1 i))))))
(string->list s))
(with-syntax ([bv (datum->syntax #'stx bv)])
#'(quote bv)))])))
(define subsequents-map
(ascii-map
"!$%&*/:<=>?^_~+-.@abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"))
(define initials-map
(ascii-map
"!$%&*/:<=>?^_~abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"))
(define (in-map? byte map)
(let ([i ($fxlogand byte 7)]
[j ($fxsra byte 3)])
(and
(fx< j ($bytevector-length map))
(let ([mask ($fxsll 1 i)])
(not ($fxzero?
($fxlogand mask
($bytevector-u8-ref map j))))))))
(define (write-subsequent* str i j p)
(unless ($fx= i j)
(let* ([c ($string-ref str i)]
[b ($char->fixnum c)])
(cond
[(in-map? b subsequents-map)
(write-char c p)]
[($fx< b 128)
(write-inline-hex b p)]
[(unicode-printable-char? c)
(write-char c p)]
[else
(write-inline-hex b p)]))
(write-subsequent* str ($fxadd1 i) j p)))
(define write-symbol-hex-esc
(lambda (str p)
(let ([n ($string-length str)])
(cond
[($fx= n 0)
(write-char #\| p)
(write-char #\| p)]
[else
(let* ([c0 ($string-ref str 0)]
[b0 ($char->fixnum c0)])
(cond
[(in-map? b0 initials-map)
(write-char c0 p)]
[($fx< b0 128) (write-inline-hex b0 p)]
[(unicode-printable-char? c0) (write-char c0 p)]
[else (write-inline-hex b0 p)])
(write-subsequent* str 1 n p))]))))
(define (write-peculiar str p)
(let ([n ($string-length str)])
(cond
[($fx= n 1)
(write-char ($string-ref str 0) p)]
[(and ($fx>= n 2)
($char= ($string-ref str 0) #\-)
($char= ($string-ref str 1) #\>))
(write-char #\- p)
(write-char #\> p)
(write-subsequent* str 2 n p)]
[(string=? str "...")
(write-char #\. p)
(write-char #\. p)
(write-char #\. p)]
[else (error 'write-peculiear "BUG")])))
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(define write-symbol
(lambda (x p m)
(write-symbol-string (symbol->string x) p m)))
(define write-symbol-string
(lambda (str p m)
(if m
(if (peculiar-symbol-string? str)
(write-peculiar str p)
(write-symbol-hex-esc str p))
(write-char* str p))))
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(define write-gensym
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(lambda (x p m h i)
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(cond
[(and m (print-gensym)) =>
(lambda (gensym-how)
(case gensym-how
[(pretty)
(let ([str (symbol->string x)])
(write-char #\# p)
(write-char #\: p)
(write-symbol-string str p m))]
[else
(let ([str (symbol->string x)]
[ustr (gensym->unique-string x)])
(write-char #\# p)
(write-char #\{ p)
(write-symbol-string str p m)
(write-char #\space p)
(write-symbol-bar-esc ustr p)
(write-char #\} p))])
i)]
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[else
(write-symbol x p m)
i])))
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(define write-inline-hex
(lambda (b p)
(write-char #\\ p)
(write-char #\x p)
(if ($fxzero? b)
(write-char #\0 p)
(write-positive-hex-fx b p))
(write-char #\; p)))
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(define write-string-escape
(lambda (x p)
(define loop
(lambda (x i n p)
(unless (fx= i n)
(let* ([c (string-ref x i)]
[b ($char->fixnum c)])
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(cond
[($fx< b 32)
(cond
[($fx< b 7)
(write-inline-hex b p)]
[($fx< b 14)
(write-char #\\ p)
(write-char (string-ref "abtnvfr" ($fx- b 7)) p)]
[else
(write-inline-hex b p)])]
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[(or ($char= #\" c) ($char= #\\ c))
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(write-char #\\ p)
(write-char c p)]
[($fx< b 127)
(write-char c p)]
[(unicode-printable-char? c)
(write-char c p)]
[else (write-inline-hex b p)]))
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(loop x (fxadd1 i) n p))))
(write-char #\" p)
(loop x 0 (string-length x) p)
(write-char #\" p)))
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(define write-string
(lambda (x p m)
(if m
(write-string-escape x p)
(write-char* x p))))
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(define write-fixnum
(lambda (x p)
(define loop
(lambda (x p)
(unless (fxzero? x)
(loop (fxquotient x 10) p)
(write-char
($fixnum->char
($fx+ (fxremainder x 10)
($char->fixnum #\0)))
p))))
(cond
[(fxzero? x) (write-char #\0 p)]
[(fx< x 0)
(write-char #\- p)
(if (fx= x -536870912)
(write-char* "536870912" p)
(loop (fx- 0 x) p))]
[else (loop x p)])))
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(define write-char*
(lambda (x p)
(define loop
(lambda (x i n p)
(unless (fx= i n)
(write-char (string-ref x i) p)
(loop x (fxadd1 i) n p))))
(loop x 0 (string-length x) p)))
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(define macro
(lambda (x h)
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(define macro-forms
'([quote . "'"]
[quasiquote . "`"]
[unquote . ","]
[unquote-splicing . ",@"]
[syntax . "#'"]
[quasisyntax . "#`"]
[unsyntax . "#,"]
[unsyntax-splicing . "#,@"]
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[|#primitive| . "#%"]))
(and (pair? x)
(let ([d ($cdr x)])
(and (pair? d)
(null? ($cdr d))
(not (hashtable-ref h x #f))))
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(assq ($car x) macro-forms))))
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(define write-pair
(lambda (x p m h i)
(cond
[(macro x h) =>
(lambda (a)
(display (cdr a) p)
(writer (cadr x) p m h i))]
[else
(write-char #\( p)
(let ([i (writer (car x) p m h i)])
(let ([i (write-list (cdr x) p m h i)])
(write-char #\) p)
i))])))
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(define write-ref
(lambda (n p)
(write-char #\# p)
(write-fixnum (fx- -1 n) p)
(write-char #\# p)))
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(define write-mark
(lambda (n p)
(write-char #\# p)
(write-fixnum (fx- -1 n) p)
(write-char #\= p)))
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(define write-shareable
(lambda (x p m h i k)
(cond
[(hashtable-ref h x #f) =>
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(lambda (n)
(cond
[(fx< n 0)
(write-ref n p)
i]
[(fx= n 0)
(k x p m h i)]
[else
(let ([i (fx- i 1)])
(hashtable-set! h x i)
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(write-mark i p)
(k x p m h i))]))]
[else (k x p m h i)])))
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(define writer
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(lambda (x p m h i)
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(cond
[(pair? x)
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(write-shareable x p m h i write-pair)]
[(symbol? x)
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(if (gensym? x)
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(write-gensym x p m h i)
(begin (write-symbol x p m) i))]
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[(fixnum? x)
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(write-fixnum x p)
i]
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[(string? x)
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(write-string x p m)
i]
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[(boolean? x)
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(write-char* (if x "#t" "#f") p)
i]
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[(char? x)
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(write-character x p m)
i]
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[(procedure? x)
(cond
[(let ([name (procedure-annotation x)])
(and (symbol? name) name)) =>
(lambda (name)
(write-char* "#<procedure " p)
(write-char* (symbol->string name) p)
(write-char* ">" p))]
[else (write-char* "#<procedure>" p)])
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i]
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[(output-port? x)
(write-char* "#<output-port " p)
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(let ([i (writer (output-port-name x) p #t h i)])
(write-char #\> p)
i)]
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[(input-port? x)
(write-char* "#<input-port " p)
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(let ([i (writer (input-port-name x) p #t h i)])
(write-char #\> p)
i)]
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[(vector? x)
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(write-shareable x p m h i write-vector)]
[(bytevector? x)
(write-shareable x p m h i write-bytevector)]
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[(null? x)
(write-char #\( p)
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(write-char #\) p)
i]
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[(eq? x (void))
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(write-char* "#<void>" p)
i]
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[(eof-object? x)
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(write-char* "#!eof" p)
i]
[(bwp-object? x)
(write-char* "#!bwp" p)
i]
[(hashtable? x)
(write-char* "#<hashtable>" p)
i]
[(struct? x)
(let ([printer (struct-printer x)])
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(if (procedure? printer)
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(begin (printer x p) i)
(write-shareable x p m h i write-struct)))]
[(code? x)
(write-char* "#<code>" p)]
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[($unbound-object? x)
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(write-char* "#<unbound-object>" p)
i]
;;; [($forward-ptr? x) FIXME reinstate
;;; (write-char* "#<forward-ptr>" p)
;;; i]
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[(number? x)
(write-char* (number->string x) p)
i]
[($transcoder? x)
(write-char* "#<transcoder " p)
(let ([n ($transcoder->data x)])
(write-char* (number->string n) p))
(write-char* ">" p)]
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[else
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(write-char* "#<unknown>" p)
i])))
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(define print-graph (make-parameter #f))
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(define (hasher x h)
(define (vec-graph x i j h)
(unless (fx= i j)
(graph (vector-ref x i) h)
(vec-graph x (fxadd1 i) j h)))
(define (vec-dynamic x i j h)
(unless (fx= i j)
(dynamic (vector-ref x i) h)
(vec-dynamic x (fxadd1 i) j h)))
(define (graph x h)
(cond
[(pair? x)
(cond
[(hashtable-ref h x #f) =>
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(lambda (n)
(hashtable-set! h x (fxadd1 n)))]
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[else
(hashtable-set! h x 0)
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(graph (car x) h)
(graph (cdr x) h)])]
[(vector? x)
(cond
[(hashtable-ref h x #f) =>
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(lambda (n)
(hashtable-set! h x (fxadd1 n)))]
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[else
(hashtable-set! h x 0)
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(vec-graph x 0 (vector-length x) h)])]
[(gensym? x)
(cond
[(hashtable-ref h x #f) =>
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(lambda (n)
(hashtable-set! h x (fxadd1 n)))])]))
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(define (dynamic x h)
(cond
[(pair? x)
(cond
[(hashtable-ref h x #f) =>
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(lambda (n)
(hashtable-set! h x (fxadd1 n)))]
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[else
(hashtable-set! h x 0)
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(dynamic (car x) h)
(dynamic (cdr x) h)
(when (and (hashtable-ref h x #f)
(fxzero? (hashtable-ref h x #f)))
(hashtable-set! h x #f))])]
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[(vector? x)
(cond
[(hashtable-ref h x #f) =>
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(lambda (n)
(hashtable-set! h x (fxadd1 n)))]
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[else
(hashtable-set! h x 0)
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(vec-dynamic x 0 (vector-length x) h)
(when (and (hashtable-ref h x #f)
(fxzero? (hashtable-ref h x #f)))
(hashtable-set! h x #f))])]))
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(if (print-graph)
(graph x h)
(dynamic x h)))
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(define (write-to-port x p)
(let ([h (make-eq-hashtable)])
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(hasher x h)
(writer x p #t h 0))
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(flush-output-port p))
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(define (display-to-port x p)
(let ([h (make-eq-hashtable)])
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(hasher x h)
(writer x p #f h 0))
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(flush-output-port p))
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(define formatter
(lambda (who p fmt args)
(let f ([i 0] [args args])
(unless (fx= i (string-length fmt))
(let ([c (string-ref fmt i)])
(cond
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[($char= c #\~)
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(let ([i (fxadd1 i)])
(when (fx= i (string-length fmt))
(error who "invalid ~ at end of format string" fmt))
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(let ([c (string-ref fmt i)])
(cond
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[($char= c #\~)
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(write-char #\~ p)
(f (fxadd1 i) args)]
[($char= c #\%)
(write-char #\newline p)
(f (fxadd1 i) args)]
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[($char= c #\a)
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(when (null? args)
(error who "insufficient arguments"))
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(display-to-port (car args) p)
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(f (fxadd1 i) (cdr args))]
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[($char= c #\s)
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(when (null? args)
(error who "insufficient arguments"))
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(write-to-port (car args) p)
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(f (fxadd1 i) (cdr args))]
[(assv c '([#\b . 2] [#\o . 8] [#\x . 16] [#\d . 10]))
=>
(lambda (x)
(when (null? args)
(error who "insufficient arguments"))
(let ([a (car args)])
(cond
[(or (fixnum? a) (bignum? a) (ratnum? a))
(display-to-port (number->string a (cdr x)) p)]
[(flonum? a)
(unless (eqv? c #\d)
(error who
(format "flonums cannot be printed with ~~~a" c)))
(display-to-port (number->string a) p)]
[else
(error who "not a number" a)]))
(f (fxadd1 i) (cdr args)))]
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[else
(error who "invalid sequence character after ~" c)])))]
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[else
(write-char c p)
(f (fxadd1 i) args)]))))
(flush-output-port p)))
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(define fprintf
(lambda (port fmt . args)
(unless (output-port? port)
(error 'fprintf "not an output port" port))
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(unless (string? fmt)
(error 'fprintf "not a string" fmt))
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(formatter 'fprintf port fmt args)))
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(define display-error
(lambda (errname who fmt args)
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(unless (string? fmt)
(error 'print-error "not a string" fmt))
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(let ([p (standard-error-port)])
(if who
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(fprintf p "~a in ~a: " errname who)
(fprintf p "~a: " errname))
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(formatter 'print-error p fmt args)
(write-char #\. p)
(newline p))))
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(define format
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(lambda (fmt . args)
(unless (string? fmt)
(error 'format "not a string" fmt))
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(let ([p (open-output-string)])
(formatter 'format p fmt args)
(get-output-string p))))
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(define printf
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(lambda (fmt . args)
(unless (string? fmt)
(error 'printf "not a string" fmt))
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(formatter 'printf (current-output-port) fmt args)))
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(define write
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(case-lambda
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[(x) (write-to-port x (current-output-port))]
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[(x p)
(unless (output-port? p)
(error 'write "not an output port" p))
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(write-to-port x p)]))
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(define display
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(case-lambda
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[(x) (display-to-port x (current-output-port))]
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[(x p)
(unless (output-port? p)
(error 'display "not an output port" p))
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(display-to-port x p)]))
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(define print-error
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(lambda (who fmt . args)
(display-error "Error" who fmt args)))
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(define warning
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(lambda (who fmt . args)
(display-error "Warning" who fmt args)))
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)
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