/usr/share/gauche-0.9/0.9.4/lib/gauche/serializer/aserializer.scm is in gauche 0.9.4-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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;;; aserializer.scm - a serializer implementation
;;;
;;; Copyright (c) 2000-2014 Shiro Kawai <shiro@acm.org>
;;;
;;; Redistribution and use in source and binary forms, with or without
;;; modification, are permitted provided that the following conditions
;;; are met:
;;;
;;; 1. Redistributions of source code must retain the above copyright
;;; notice, this list of conditions and the following disclaimer.
;;;
;;; 2. Redistributions in binary form must reproduce the above copyright
;;; notice, this list of conditions and the following disclaimer in the
;;; documentation and/or other materials provided with the distribution.
;;;
;;; 3. Neither the name of the authors nor the names of its contributors
;;; may be used to endorse or promote products derived from this
;;; software without specific prior written permission.
;;;
;;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
;;; "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
;;; LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
;;; A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
;;; OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
;;; SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
;;; TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
;;; PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
;;; LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
;;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
;;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;;;
;; This is a straightforward port from the one I wrote for STk before.
;; The original module has been working quite well in the application
;; I wrote. Nevertheless, I want to make this more general. Expect
;; incompatible changes in the future.
(define-module gauche.serializer.aserializer
(use gauche.serializer)
(export <aserializer>))
(select-module gauche.serializer.aserializer)
(define-class <aserializer> (<serializer>)
((ref-count :accessor ref-count-of
:init-form 0)
(obj-dict :getter obj-dict-of
:init-form (make-hash-table))
(class-dict :getter class-dict-of
:init-form (make-hash-table))
))
;; tag definitions. currently, it is upper-compatible from pserializer.
(define *tag-symbol* 'y)
(define *tag-pair* 'p)
(define *tag-vector* 'v)
(define *tag-string* 's)
(define *tag-reference* 'r)
(define *tag-hash-table* 'h)
(define *tag-keyword* 'k)
(define *tag-instance* 'i)
(define-method write-to-serializer ((self <aserializer>) object)
(define port (port-of self))
(define dict (obj-dict-of self))
(define cdict (class-dict-of self))
(define (get-class-info class instance)
(let ((c (hash-table-get cdict class #f)))
(or c
(let ((c (cons (class-name class)
(get-serializable-slots instance))))
(hash-table-put! cdict class c)
c))))
(define (write-rec obj)
(cond ((or (eq? obj #f) (eq? obj #t) (eq? obj '())
(number? obj) (char? obj))
(write obj port) (newline port))
((hash-table-get dict obj #f)
=> (lambda (ref)
(write *tag-reference* port) (display #\space port)
(write ref port) (newline port)))
(else
(hash-table-put! dict obj (ref-count-of self))
(set! (ref-count-of self) (+ (ref-count-of self) 1))
(cond
((pair? obj)
(write *tag-pair* port) (display #\space port)
(write-rec (car obj)) (write-rec (cdr obj)))
((symbol? obj)
(write *tag-symbol* port) (display #\space port)
(write obj port) (newline port))
((string? obj)
(write *tag-string* port) (display #\space port)
(write obj port) (newline port))
((keyword? obj)
(write *tag-keyword* port) (display #\space port)
(display obj port) (newline port))
((vector? obj)
(write *tag-vector* port) (display #\space port)
(write (vector-length obj) port) (newline port)
(for-each write-rec (vector->list obj)))
((hash-table? obj)
(write *tag-hash-table* port) (display #\space port)
(let ((num 0)) ; put # of entries
(hash-table-for-each obj (lambda _ (set! num (+ num 1))))
(write num port) (newline port))
(hash-table-for-each ; put keys and values
obj
(lambda (key value) (write-rec key) (write-rec value))))
((is-a? obj <object>)
(write *tag-instance* port) (display #\space port)
(let* ((class (class-of obj))
(cinfo (get-class-info class obj)))
(write-rec cinfo)
(for-each (lambda (s)
(if (slot-bound? obj s)
(write-rec (slot-ref obj s))
(write-rec #f))) ;;FIXME
(cdr cinfo))))
(else
(error "unserializable object:" obj))))
));;write rec
(unless (eq? (direction-of self) :out)
(error "Output serializer required:" self))
(write-rec object))
(define-method read-from-serializer ((self <aserializer>))
(define port (port-of self))
(define dict (obj-dict-of self))
(define cdict (class-dict-of self))
(define (register obj)
(let ((cnt (ref-count-of self)))
(hash-table-put! dict cnt obj)
(set! (ref-count-of self) (+ cnt 1))
obj))
(define (read-rec)
(let ((tag (read port)))
(cond ((eof-object? tag) tag)
((not (symbol? tag)) tag)
((eq? tag *tag-pair*) (let ((cell (cons #t #t)))
(register cell)
(let* ((ca (read-rec))
(cd (read-rec)))
(set-car! cell ca)
(set-cdr! cell cd)
cell)))
((eq? tag *tag-reference*) (let* ((ref (read port))
(obj (hash-table-get dict ref #f)))
(or obj (error "Stray reference"))))
((eq? tag *tag-symbol*) (register (read port)))
((eq? tag *tag-string*) (register (read port)))
((eq? tag *tag-instance*) (read-instance))
((eq? tag *tag-keyword*) (register (make-keyword (read port))))
((eq? tag *tag-hash-table*) (read-hash-table))
((eq? tag *tag-vector*) (let* ((len (read port))
(vec (make-vector len)))
(register vec)
(do ((num 0 (+ num 1)))
((>= num len) vec)
(vector-set! vec num (read-rec)))))
(else
(error "encountered unknown tag:" tag)))))
(define (read-hash-table)
(let ((num (read port))
(ht (make-hash-table)))
(register ht)
(do ((num num (- num 1)))
((= num 0) ht)
(let* ((key (read-rec))
(val (read-rec)))
(hash-table-put! ht key val)))))
(define (read-instance)
;; we need to register a dummy object before proceed to retrieve
;; the rest of information.
(let* ((index (let ((cnt (ref-count-of self)))
(set! (ref-count-of self) (+ cnt 1))
cnt))
(cinfo (read-rec))
(class (car cinfo))
(slots (cdr cinfo))
(obj (make (eval class #f))) ;Arrgghh
(exist-slots (get-serializable-slots obj)))
(hash-table-put! dict index obj)
(for-each (lambda (s)
(let ((val (read-rec)))
(when (memq s exist-slots)
(slot-set! obj s val))))
slots)
obj))
(unless (eq? (direction-of self) :in)
(error "Input serializer required:" self))
(read-rec))
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