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-;;; 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))
-
-