circular-streams

https://github.com/fukamachi/circular-streams.git


    git clone 'https://github.com/fukamachi/circular-streams.git'
      

      

(ql:quickload :circular-streams)

★2

Circular-Streams - Circularly readable streams for Common Lisp

Usage

(defparameter *stream*
              (flex:make-in-memory-input-stream
               #(72 101 108 108 111)))

(defparameter *circular-stream*
              (make-circular-input-stream *stream*))

(read-char *circular-stream*)          ;=> #\H
(read-char *circular-stream*)          ;=> #\e
(read-char *circular-stream*)          ;=> #\l
(read-char *circular-stream*)          ;=> #\l
(read-char *circular-stream*)          ;=> #\o
(read-char *circular-stream* nil :eof) ;=> :eof

(let ((buf (make-array 5 :adjustable t :fill-pointer 5)))
  (read-sequence buf *circular-stream*)
  (flex:octets-to-string buf))
;=> "Hello"

Description

Circular-Streams allows you to read streams circularly by wrapping real streams. Once you reach end-of-file of a stream, it's file position will be reset to 0 and you're able to read it again.

Note this library can treat only octet streams which has a method read-byte. This might be expanded in the future.

This library was originally written by Tomohiro Matsuyama as a part of Clack, Eitarow Fukamachi ported it with some improvements.

API Reference

[Class] circular-input-stream

Class for circular input streams. make-circular-input-stream is available to create an instance.

[Function] make-circular-input-stream

Creates circular-input-stream and returns it. If :buffer is specified, the instance uses it as an internal buffer. You need this to reuse circular-input-stream without saving itself.

[Function] make-circular-stream-buffer

Creates a buffer array for circular-input-stream.

Author

Tomohiro Matsuyama (tomo@cx4a.org)
Eitarow Fukamachi (e.arrows@gmail.com)

Copyright

License

Licensed under the LLGPL License.