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Diffstat (limited to 'ice-9/lineio.scm')
-rw-r--r-- | ice-9/lineio.scm | 112 |
1 files changed, 0 insertions, 112 deletions
diff --git a/ice-9/lineio.scm b/ice-9/lineio.scm deleted file mode 100644 index ffde88608..000000000 --- a/ice-9/lineio.scm +++ /dev/null @@ -1,112 +0,0 @@ -;;; installed-scm-file - -;;;; Copyright (C) 1996 Free Software Foundation, Inc. -;;;; -;;;; This program is free software; you can redistribute it and/or modify -;;;; it under the terms of the GNU General Public License as published by -;;;; the Free Software Foundation; either version 2, or (at your option) -;;;; any later version. -;;;; -;;;; This program is distributed in the hope that it will be useful, -;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of -;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -;;;; GNU General Public License for more details. -;;;; -;;;; You should have received a copy of the GNU General Public License -;;;; along with this software; see the file COPYING. If not, write to -;;;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. -;;;; - - - -(define-module #/ice-9/lineio) - - -;;; {Line Buffering Input Ports} -;;; -;;; [This is a work-around to get past certain deficiencies in the capabilities -;;; of ports. Eventually, ports should be fixed and this module nuked.] -;;; -;;; A line buffering input port supports: -;;; -;;; read-string which returns the next line of input -;;; unread-string which pushes a line back onto the stream -;;; -;;; Normally a "line" is all characters up to and including a newline. -;;; If lines are put back using unread-string, they can be broken arbitrarily -;;; -- that is, read-string returns strings passed to unread-string (or -;;; shared substrings of them). -;;; - -;; read-string port -;; unread-string port str -;; Read (or buffer) a line from PORT. -;; -;; Not all ports support these functions -- only those with -;; 'unread-string and 'read-string properties, bound to hooks -;; implementing these functions. -;; -(define-public (unread-string str line-buffering-input-port) - ((object-property line-buffering-input-port 'unread-string) str)) - -;; -(define-public (read-string line-buffering-input-port) - ((object-property line-buffering-input-port 'read-string))) - - -(define-public (lineio-port? port) - (not (not (object-property port 'read-string)))) - -;; make-line-buffering-input-port port -;; Return a wrapper for PORT. The wrapper handles read-string/unread-string. -;; -;; The port returned by this function reads newline terminated lines from PORT. -;; It buffers these characters internally, and parsels them out via calls -;; to read-char, read-string, and unread-string. -;; - -(define-public (make-line-buffering-input-port underlying-port) - (let* (;; buffers - a list of strings put back by unread-string or cached - ;; using read-line. - ;; - (buffers '()) - - ;; getc - return the next character from a buffer or from the underlying - ;; port. - ;; - (getc (lambda () - (if (not buffers) - (read-char underlying-port) - (let ((c (string-ref (car buffers)))) - (if (= 1 (string-length (car buffers))) - (set! buffers (cdr buffers)) - (set-car! buffers (make-shared-substring (car buffers) 1))) - c)))) - - (propogate-close (lambda () (close-port underlying-port))) - - (self (make-soft-port (vector #f #f #f getc propogate-close) "r")) - - (unread-string (lambda (str) - (and (< 0 (string-length str)) - (if (ungetc-char-ready? self) - (set! buffers (append! (list str (string (read-char self))) buffers)) - (set! buffers (cons str buffers)))))) - - (read-string (lambda () - (cond - (buffers (let ((answer (car buffers))) - (set! buffers (cdr buffers)) - answer)) - - ((ungetc-char-ready? self) (read-line self 'include-newline)) - - (else (read-line underlying-port 'include-newline))))) - - ) - - (set-object-property! self 'unread-string unread-string) - (set-object-property! self 'read-string read-string) - self)) - - |