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

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• Hash : 0151b5b6
  Author : Thomas de Grivel
  Date : 2018-05-16T09:28:06
  

  stream-open-p

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• babel-output-stream.lisp

• ;;
  ;;  babel-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 :babel-stream)
  
  (defclass babel-output-stream (babel-stream output-stream)
    ())
  
  (defmethod stream-clear-output ((stream babel-output-stream))
    (stream-clear-output (stream-underlying-stream stream)))
  
  (defmethod stream-finish-output ((stream babel-output-stream))
    (stream-finish-output (stream-underlying-stream stream)))
  
  (defmethod stream-flush-output ((stream babel-output-stream))
    (stream-flush-output (stream-underlying-stream stream)))
  
  (defmethod stream-open-p ((stream babel-output-stream))
    (stream-open-p (stream-underlying-stream stream)))
  
  (defmethod stream-write ((stream babel-output-stream) (element fixnum))
    (assert (typep element '(unsigned-byte 8)))
    (write (stream-underlying-stream stream) element))
  
  (defmethod stream-write ((stream babel-output-stream)
                           (element character))
    (let* ((encoding (stream-external-format stream))
           (mapping (babel::lookup-mapping babel::*string-vector-mappings*
                                           encoding))
           (string (make-string 1 :initial-element element))
           (bytes (make-array '(8) :element-type '(unsigned-byte 8)))
           (length (funcall (the function (babel::encoder mapping))
                            string 0 1 bytes 0)))
      (write-sequence bytes
                      :stream (stream-underlying-stream stream)
                      :end length)))
  
  (defun babel-output-stream (stream &optional (external-format :utf-8))
    (make-instance 'babel-output-stream
                   :external-format external-format
                   :stream stream))
  
  #+test
  (let ((s (make-instance 'babel-output-stream
                          :stream (fd-stream:fd-output-stream 1))))
    (write-sequence s "Hello, world ! ÉÀÖÛŸ")
    (flush s))
  

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