cl-stream/utf8-stream/utf8-output-stream.lisp

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• Hash : 04472c9c
  Author : Thomas de Grivel
  Date : 2018-06-14T13:39:17
  

  use cl-stream:super-stream

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• utf8-output-stream.lisp

• ;;
  ;;  utf8-stream  -  charset encoding/decoding layer for cl-stream
  ;;
  ;;  Copyright 2017,2018 Thomas de Grivel <thoxdg@gmail.com>
  ;;
  ;;  Permission to use, copy, modify, and distribute this software for any
  ;;  purpose with or without fee is hereby granted, provided that the above
  ;;  copyright notice and this permission notice appear in all copies.
  ;;
  ;;  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  ;;  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  ;;  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  ;;  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  ;;  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  ;;  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  ;;  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  ;;
  
  (in-package :utf8-stream)
  
  (defclass utf8-output-stream (utf8-stream output-stream)
    ((bytes :initform (make-array '(8) :element-type '(unsigned-byte 8))
            :reader stream-bytes
            :type (array (unsigned-byte 8)))
     (bytes-length :initform 0
                   :accessor stream-bytes-length
                   :type fixnum+)))
  
  (defmethod stream-write ((stream utf8-output-stream)
                           (element character))
    (stream-write (stream-underlying-stream stream) element))
  
  (defun decode (stream bytes)
    (let* ((mapping (mapping stream))
           (string (make-string 1)))
      (when (= 1 (funcall (the function (babel::decoder mapping))
                          bytes 0 (stream-bytes-length stream)
                          string 0))
        (setf (stream-bytes-length stream) 0)
        (stream-write (stream-underlying-stream stream)
                      (char string 0)))))
          
  (defmethod stream-write ((stream utf8-output-stream)
                           (element integer))
    (assert (typep element '(unsigned-byte 8)))
    (let ((bytes (stream-bytes stream)))
      (setf (aref bytes (stream-bytes-length stream)) element)
      (incf (stream-bytes-length stream))
      (handler-case
          (decode stream bytes)
        (babel-encodings:end-of-input-in-character ()))))
  
  (defun utf8-output-stream (stream &optional (format :utf-8))
    (make-instance 'utf8-output-stream
                   :format format
                   :stream stream))
  
  #+test
  (let ((s (make-instance 'utf8-output-stream
                          :stream (fd-stream:fd-output-stream 1))))
    (write-sequence s "Hello, world ! ÉÀÖÛŸ")
    (flush s))
  

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