/usr/share/common-lisp/source/closure-common/ystream.lisp is in cl-closure-common 20101107-1.
This file is owned by root:root, with mode 0o644.
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;;; License: Lisp-LGPL (See file COPYING for details).
;;;
;;; ystream (for lack of a better name): a rune output "stream"
(in-package :runes)
(defconstant +ystream-bufsize+ 1024)
(defun make-ub8-array (n)
(make-array n :element-type '(unsigned-byte 8)))
(defun make-ub16-array (n)
(make-array n :element-type '(unsigned-byte 16)))
(defun make-buffer (&key (element-type '(unsigned-byte 8)))
(make-array 1
:element-type element-type
:adjustable t
:fill-pointer 0))
(defmacro while (test &body body)
`(until (not ,test) ,@body))
(defmacro until (test &body body)
`(do () (,test) ,@body))
(defun find-output-encoding (name)
(when (stringp name)
(setf name (find-symbol (string-upcase name) :keyword)))
(cond
((null name)
(warn "Unknown encoding ~A, falling back to UTF-8" name)
:utf-8)
((find name '(:utf-8 :utf_8 :utf8))
:utf-8)
#-rune-is-character
(t
(warn "Unknown encoding ~A, falling back to UTF-8" name)
:utf-8)
#+rune-is-character
(t
(handler-case
(babel-encodings:get-character-encoding name)
(error ()
(warn "Unknown encoding ~A, falling back to UTF-8" name)
:utf-8)))))
;;; ystream
;;; +- encoding-ystream
;;; | +- octet-vector-ystream
;;; | \- %stream-ystream
;;; | +- octet-stream-ystream
;;; | \- character-stream-ystream/utf8
;;; | \- string-ystream/utf8
;;; +- rod-ystream
;;; \-- character-stream-ystream
(defstruct ystream
#+rune-is-character (encoding)
(column 0 :type integer)
(in-ptr 0 :type fixnum)
(in-buffer (make-rod +ystream-bufsize+) :type simple-rod))
(defun ystream-unicode-p (ystream)
(let ((enc (ystream-encoding ystream)))
(or (eq enc :utf-8)
(eq (babel-encodings:enc-name enc) :utf-16))))
(defstruct (encoding-ystream
(:include ystream)
(:conc-name "YSTREAM-"))
(out-buffer (make-ub8-array (* 6 +ystream-bufsize+))
:type (simple-array (unsigned-byte 8) (*))))
(defstruct (%stream-ystream
(:include encoding-ystream)
(:conc-name "YSTREAM-"))
(os-stream nil))
;; writes a rune to the buffer. If the rune is not encodable, an error
;; might be signalled later during flush-ystream.
(definline ystream-write-rune (rune ystream)
(let ((in (ystream-in-buffer ystream)))
(when (eql (ystream-in-ptr ystream) (length in))
(flush-ystream ystream)
(setf in (ystream-in-buffer ystream)))
(setf (elt in (ystream-in-ptr ystream)) rune)
(incf (ystream-in-ptr ystream))
(setf (ystream-column ystream)
(if (eql rune #/U+000A) 0 (1+ (ystream-column ystream))))
rune))
;; Writes a rod to the buffer. If a rune in the rod not encodable, an error
;; might be signalled later during flush-ystream.
(defun ystream-write-rod (rod ystream)
;;
;; OPTIMIZE ME
;;
(loop for rune across rod do (ystream-write-rune rune ystream)))
(defun ystream-write-escapable-rune (rune ystream)
;;
;; OPTIMIZE ME
;;
(let ((tmp (make-rod 1)))
(setf (elt tmp 0) rune)
(ystream-write-escapable-rod tmp ystream)))
#-rune-is-character
;;
;; on non-unicode lisps, we only support UTF-8 anyway, so this is like
;; ystream-write-rod, which will never signal an error in this configuration.
(defun ystream-write-escapable-rod (rod ystream)
(ystream-write-rod rod ystream))
;; Writes a rod to the buffer. If a rune in the rod not encodable, it is
;; replaced by a character reference.
;;
#+rune-is-character
(defun ystream-write-escapable-rod (rod ystream)
;;
;; OPTIMIZE ME
;;
(if (ystream-unicode-p ystream)
(ystream-write-rod rod ystream)
(loop
with encoding = (ystream-encoding ystream)
for rune across rod
do
(if (encodablep rune encoding)
(ystream-write-rune rune ystream)
(let ((cr (string-rod (format nil "&#~D;" (rune-code rune)))))
(ystream-write-rod cr ystream))))))
#+rune-is-character
(defun encodablep (character encoding)
(handler-case
(babel:string-to-octets (string character) :encoding encoding)
(babel-encodings:character-encoding-error ()
nil)))
(defmethod close-ystream :before ((ystream ystream))
(flush-ystream ystream))
;;;; ENCODING-YSTREAM (abstract)
(defmethod close-ystream ((ystream %stream-ystream))
(ystream-os-stream ystream))
(defgeneric ystream-device-write (ystream buf nbytes))
#-rune-is-character
(defun encode-runes (out in ptr encoding)
(runes-to-utf8 out in ptr))
#+rune-is-character
(defun encode-runes (out in ptr encoding)
(case encoding
(:utf-8
(runes-to-utf8 out in ptr))
(t
;; by lucky coincidence, babel::unicode-string is the same as simple-rod
#+nil (coerce string 'babel::unicode-string)
(let* ((babel::*suppress-character-coding-errors* nil)
(mapping (babel::lookup-mapping babel::*string-vector-mappings*
encoding)))
(funcall (babel::encoder mapping) in 0 ptr out 0)
(funcall (babel::octet-counter mapping) in 0 ptr -1)))))
(defmethod flush-ystream ((ystream encoding-ystream))
(let ((ptr (ystream-in-ptr ystream)))
(when (plusp ptr)
(let* ((in (ystream-in-buffer ystream))
(out (ystream-out-buffer ystream))
#+rune-is-utf-16
(surrogatep (<= #xD800 (rune-code (elt in (1- ptr))) #xDBFF))
n)
#+rune-is-utf-16
(when surrogatep
(decf ptr))
(when (plusp ptr)
(setf n (encode-runes out in ptr (ystream-encoding ystream)))
(ystream-device-write ystream out n)
(cond
#+rune-is-utf-16
(surrogatep
(setf (elt in 0) (elt in (1- ptr)))
(setf (ystream-in-ptr ystream) 1))
(t
(setf (ystream-in-ptr ystream) 0))))))))
(defun fast-push (new-element vector)
(vector-push-extend new-element vector (max 1 (array-dimension vector 0))))
(macrolet ((define-utf8-writer (name (byte &rest aux) result &body body)
`(defun ,name (out in n)
(let (#+rune-is-utf-16 (high-surrogate nil)
,@aux)
(labels
((write0 (,byte)
,@body)
(write1 (r)
(cond
((<= #x00000000 r #x0000007F)
(write0 r))
((<= #x00000080 r #x000007FF)
(write0 (logior #b11000000 (ldb (byte 5 6) r)))
(write0 (logior #b10000000 (ldb (byte 6 0) r))))
((<= #x00000800 r #x0000FFFF)
(write0 (logior #b11100000 (ldb (byte 4 12) r)))
(write0 (logior #b10000000 (ldb (byte 6 6) r)))
(write0 (logior #b10000000 (ldb (byte 6 0) r))))
((<= #x00010000 r #x001FFFFF)
(write0 (logior #b11110000 (ldb (byte 3 18) r)))
(write0 (logior #b10000000 (ldb (byte 6 12) r)))
(write0 (logior #b10000000 (ldb (byte 6 6) r)))
(write0 (logior #b10000000 (ldb (byte 6 0) r))))
((<= #x00200000 r #x03FFFFFF)
(write0 (logior #b11111000 (ldb (byte 2 24) r)))
(write0 (logior #b10000000 (ldb (byte 6 18) r)))
(write0 (logior #b10000000 (ldb (byte 6 12) r)))
(write0 (logior #b10000000 (ldb (byte 6 6) r)))
(write0 (logior #b10000000 (ldb (byte 6 0) r))))
((<= #x04000000 r #x7FFFFFFF)
(write0 (logior #b11111100 (ldb (byte 1 30) r)))
(write0 (logior #b10000000 (ldb (byte 6 24) r)))
(write0 (logior #b10000000 (ldb (byte 6 18) r)))
(write0 (logior #b10000000 (ldb (byte 6 12) r)))
(write0 (logior #b10000000 (ldb (byte 6 6) r)))
(write0 (logior #b10000000 (ldb (byte 6 0) r))))))
(write2 (r)
(cond
#+rune-is-utf-16
((<= #xD800 r #xDBFF)
(setf high-surrogate r))
#+rune-is-utf-16
((<= #xDC00 r #xDFFF)
(let ((q (logior (ash (- high-surrogate #xD7C0) 10)
(- r #xDC00))))
(write1 q))
(setf high-surrogate nil))
#-rune-is-utf-16
((<= #xD800 r #xDFFF)
(error
"surrogates not allowed in this configuration"))
(t
(write1 r)))))
(dotimes (j n)
(write2 (rune-code (elt in j)))))
,result))))
(define-utf8-writer runes-to-utf8 (x (i 0))
i
(setf (elt out i) x)
(incf i))
(define-utf8-writer runes-to-utf8/adjustable-string (x)
nil
(fast-push (code-char x) out)))
;;;; ROD-YSTREAM
(defstruct (rod-ystream (:include ystream)))
(defmethod flush-ystream ((ystream rod-ystream))
(let* ((old (ystream-in-buffer ystream))
(new (make-rod (* 2 (length old)))))
(replace new old)
(setf (ystream-in-buffer ystream) new)))
(defmethod close-ystream ((ystream rod-ystream))
(subseq (ystream-in-buffer ystream) 0 (ystream-in-ptr ystream)))
;;;; CHARACTER-STREAM-YSTREAM
#+rune-is-character
(progn
(defstruct (character-stream-ystream
(:constructor make-character-stream-ystream (target-stream))
(:include ystream)
(:conc-name "YSTREAM-"))
(target-stream nil))
(defmethod flush-ystream ((ystream character-stream-ystream))
(write-string (ystream-in-buffer ystream)
(ystream-target-stream ystream)
:end (ystream-in-ptr ystream))
(setf (ystream-in-ptr ystream) 0))
(defmethod close-ystream ((ystream character-stream-ystream))
(ystream-target-stream ystream)))
;;;; OCTET-VECTOR-YSTREAM
(defstruct (octet-vector-ystream
(:include encoding-ystream)
(:conc-name "YSTREAM-"))
(result (make-buffer)))
(defmethod ystream-device-write ((ystream octet-vector-ystream) buf nbytes)
(let* ((result (ystream-result ystream))
(start (length result))
(size (array-dimension result 0)))
(while (> (+ start nbytes) size)
(setf size (* 2 size)))
(adjust-array result size :fill-pointer (+ start nbytes))
(replace result buf :start1 start :end2 nbytes)))
(defmethod close-ystream ((ystream octet-vector-ystream))
(ystream-result ystream))
;;;; OCTET-STREAM-YSTREAM
(defstruct (octet-stream-ystream
(:include %stream-ystream)
(:constructor make-octet-stream-ystream (os-stream))
(:conc-name "YSTREAM-")))
(defmethod ystream-device-write ((ystream octet-stream-ystream) buf nbytes)
(write-sequence buf (ystream-os-stream ystream) :end nbytes))
;;;; CHARACTER-STREAM-YSTREAM/UTF8
;; #+rune-is-integer
(progn
(defstruct (character-stream-ystream/utf8
(:constructor make-character-stream-ystream/utf8 (os-stream))
(:include %stream-ystream)
(:conc-name "YSTREAM-")))
(defmethod ystream-device-write
((ystream character-stream-ystream/utf8) buf nbytes)
(declare (type (simple-array (unsigned-byte 8) (*)) buf))
(let ((out (ystream-os-stream ystream)))
(dotimes (x nbytes)
(write-char (code-char (elt buf x)) out)))))
;;;; STRING-YSTREAM/UTF8
;; #+rune-is-integer
(progn
(defstruct (string-ystream/utf8
(:include character-stream-ystream/utf8
(os-stream (make-string-output-stream)))
(:conc-name "YSTREAM-")))
(defmethod close-ystream ((ystream string-ystream/utf8))
(get-output-stream-string (ystream-os-stream ystream))))
;;;; helper functions
(defun rod-to-utf8-string (rod)
(let ((out (make-buffer :element-type 'character)))
(runes-to-utf8/adjustable-string out rod (length rod))
out))
(defun utf8-string-to-rod (str)
(let* ((bytes (map '(vector (unsigned-byte 8)) #'char-code str))
(buffer (make-array (length bytes) :element-type 'buffer-byte))
(n (runes-encoding:decode-sequence
:utf-8 bytes 0 (length bytes) buffer 0 0 nil))
(result (make-array n :element-type 'rune)))
(map-into result #'code-rune buffer)
result))
(defclass octet-input-stream
(trivial-gray-stream-mixin fundamental-binary-input-stream)
((octets :initarg :octets)
(pos :initform 0)))
(defmethod close ((stream octet-input-stream) &key abort)
(declare (ignore abort))
(open-stream-p stream))
(defmethod stream-read-byte ((stream octet-input-stream))
(with-slots (octets pos) stream
(if (>= pos (length octets))
:eof
(prog1
(elt octets pos)
(incf pos)))))
(defmethod stream-read-sequence
((stream octet-input-stream) sequence start end &key &allow-other-keys)
(with-slots (octets pos) stream
(let* ((length (min (- end start) (- (length octets) pos)))
(end1 (+ start length))
(end2 (+ pos length)))
(replace sequence octets :start1 start :end1 end1 :start2 pos :end2 end2)
(setf pos end2)
end1)))
(defun make-octet-input-stream (octets)
(make-instance 'octet-input-stream :octets octets))
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