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#| rep.xml.printer -- companion XML printer to rep.xml.reader
$Id$
Copyright (C) 2002 John Harper <jsh@unfactored.org>
This file is part of librep.
librep 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.
librep 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 librep; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
|#
(define-structure rep.xml.printer
(export make-xml-output
print-xml-item)
(open rep
rep.regexp)
(define make-xml-output identity)
(define (substitute-entities string)
(string-replace "[<&'\"]"
(lambda ()
(car (rassoc (expand-last-match "\\0")
'(("lt" . "<")
("amp" . "&")
("apos" . "'")
("quot" . "\"")))))
string))
(define (print-params stream params)
(mapc (lambda (cell)
(format stream " %s=\"%s\""
(car cell) (substitute-entities (cdr cell))))
params))
(define (print-xml-item stream item)
(cond ((stringp item)
(write stream (substitute-entities item)))
((eq (car item) '!)
(format stream "<!%s>" (nth 1 stream)))
((symbolp (car item))
(format stream "<%s" (car item))
(print-params stream (nth 1 item))
(cond ((string-match "^\\?" (symbol-name (car item)))
(write stream "?>"))
((null (nthcdr 2 item))
(write stream "/>"))
(t
(write stream #\>)
(mapc (lambda (x)
(print-xml-item stream x)) (nthcdr 2 item))
(format stream "</%s>" (car item)))))
(t (error "Unknown item type: %s" item)))))
|
