/usr/share/gauche-0.9/0.9.4/lib/compat/jfilter.scm is in gauche 0.9.4-3.
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;;; compat.jfilter - jfilter compatibility interface
;;;
;;; 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 file defines a set of character-code conversion routine with
;; the same API as Dai INUKAI's Jfilter module
;; http://www.sci.toyama-u.ac.jp/~iwao/Scheme/Jfilter/index.html
;;
;; The intention is to ease porting the existing code using Jfilter
;; to Gauche.
;;
;; The handling of string differs between Gauche and other non-multibyte
;; Scheme implementation, and most of lower-level routines in Jfilter
;; is irrelevant. I only implement the higher-level routines.
(define-module compat.jfilter
(use gauche.charconv)
(use srfi-13)
(export cv-file
cv-string
judge-file))
(select-module compat.jfilter)
(define (ces-name->symbol name)
(let ((n (string-upcase (string-delete name #[-_]))))
(cond ((equal? n "EUCJP") 'eucj)
((member n '("CSISO2022JP" "ISO2022JP")) 'jis)
((member n '("SJIS" "SHIFTJIS")) 'sjis)
((equal? n "UTF8") 'utf8)
(else (error "unsupported encoding name:" name)))))
(define (ces-symbol->name sym default)
(case sym
((eucj) "EUCJP")
((sjis) "SJIS")
((utf8) "UTF-8")
((jis) "CSISO2022JP")
((() #f) default)
(else (error "unsupported encoding symbol:" sym))))
(define (judge-file input :optional (prefetch 5000))
(define (judge-port port)
(let ((str (read-block prefetch port)))
(ces-name->symbol (ces-guess-from-string str "*JP"))))
(cond ((string? input)
(call-with-input-file input judge-port))
((input-port? input)
(judge-port input))
(else
(error "input must be a file name or an input port, but got" input)))
)
(define (cv-string str from-code to-code)
(ces-convert str
(ces-symbol->name from-code "*JP")
(ces-symbol->name to-code "EUCJP")))
(define (cv-file input output from-code to-code :optional
(remove-cr #f) (add-cr #f) (check-length 5000))
(let ((from (ces-symbol->name from-code "*JP"))
(to (ces-symbol->name to-code "EUCJP")))
(define (cv-block iport oport)
(copy-port (open-input-conversion-port iport from
:to-code to
:buffer-size check-length)
oport))
(define (cv-line iport oport)
(let loop ((line (read-line iport)))
(if (eof-object? line)
(flush oport)
(begin
(display (ces-convert line from to) oport)
(when add-cr (display #\return oport))
(newline oport)
(loop (read-line))))))
(define (cv-out iport)
(cond ((string? output)
(call-with-output-file output
(lambda (out)
((if add-cr cv-line cv-block) iport out))))
((output-port? output)
((if add-cr cv-line cv-block) iport output))
(else "output must be a file name or an output port: ~s"
output)))
(cond ((string? input)
(call-with-input-file input cv-out))
((input-port? input)
(cv-out input))
(else "input must be a file name or an input port: ~s"
input))
))
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