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Diffstat (limited to 'ice-9/lineio.scm')
-rw-r--r-- | ice-9/lineio.scm | 140 |
1 files changed, 0 insertions, 140 deletions
diff --git a/ice-9/lineio.scm b/ice-9/lineio.scm deleted file mode 100644 index c18e87f7e..000000000 --- a/ice-9/lineio.scm +++ /dev/null @@ -1,140 +0,0 @@ -;;; installed-scm-file - -;;;; Copyright (C) 1996, 1998, 2001 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, Inc., 59 Temple Place, Suite 330, -;;;; Boston, MA 02111-1307 USA -;;;; -;;;; As a special exception, the Free Software Foundation gives permission -;;;; for additional uses of the text contained in its release of GUILE. -;;;; -;;;; The exception is that, if you link the GUILE library with other files -;;;; to produce an executable, this does not by itself cause the -;;;; resulting executable to be covered by the GNU General Public License. -;;;; Your use of that executable is in no way restricted on account of -;;;; linking the GUILE library code into it. -;;;; -;;;; This exception does not however invalidate any other reasons why -;;;; the executable file might be covered by the GNU General Public License. -;;;; -;;;; This exception applies only to the code released by the -;;;; Free Software Foundation under the name GUILE. If you copy -;;;; code from other Free Software Foundation releases into a copy of -;;;; GUILE, as the General Public License permits, the exception does -;;;; not apply to the code that you add in this way. To avoid misleading -;;;; anyone as to the status of such modified files, you must delete -;;;; this exception notice from them. -;;;; -;;;; If you write modifications of your own for GUILE, it is your choice -;;;; whether to permit this exception to apply to your modifications. -;;;; If you do not wish that, delete this exception notice. -;;;; - - - -(define-module (ice-9 lineio) - :use-module (ice-9 readline) - :export (unread-string read-string lineio-port? - make-line-buffering-input-port)) - - -;;; {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 -;;; -;;; The implementation of unread-string is kind of limited; it doesn't -;;; interact properly with unread-char, or any of the other port -;;; reading functions. Only read-string will get you back the things that -;;; unread-string accepts. -;;; -;;; 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 (unread-string str line-buffering-input-port) - ((object-property line-buffering-input-port 'unread-string) str)) - -;; -(define (read-string line-buffering-input-port) - ((object-property line-buffering-input-port 'read-string))) - - -(define (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 (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 (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)) - (set! buffers (cons str buffers))))) - - (read-string (lambda () - (cond - ((not (null? buffers)) - (let ((answer (car buffers))) - (set! buffers (cdr buffers)) - answer)) - (else - (read-line underlying-port 'concat)))))) ;handle-newline->concat - - (set-object-property! self 'unread-string unread-string) - (set-object-property! self 'read-string read-string) - self)) - - |