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;;; xml.scm -- Generic XML engine.
;;;
;;; Copyright 2003, 2004 Manuel Serrano
;;;
;;;
;;; 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 of the License, 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 program; if not, write to the Free Software
;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
;;; USA.
(define-skribe-module (skribilo engine xml))
;*---------------------------------------------------------------------*/
;* xml-engine ... */
;*---------------------------------------------------------------------*/
(define xml-engine
;; setup the xml engine
(default-engine-set!
(make-engine 'xml
:version 1.0
:format "html"
:delegate (find-engine 'base)
:filter (make-string-replace '((#\< "<")
(#\> ">")
(#\& "&")
(#\" """)
(#\@ "@"))))))
;*---------------------------------------------------------------------*/
;* markup ... */
;*---------------------------------------------------------------------*/
(let ((xml-margin 0))
(define (make-margin)
(make-string xml-margin #\space))
(define (xml-attribute? val)
(cond
((or (string? val) (number? val) (boolean? val))
#t)
((list? val)
(every? xml-attribute? val))
(else
#f)))
(define (xml-attribute att val)
(let ((s (keyword->string att)))
(printf " ~a=\"" (substring s 1 (string-length s)))
(let loop ((val val))
(cond
((or (string? val) (number? val))
(display val))
((boolean? val)
(display (if val "true" "false")))
((pair? val)
(for-each loop val))
(else
#f)))
(display #\")))
(define (xml-option opt val e)
(let* ((m (make-margin))
(ks (keyword->string opt))
(s (substring ks 1 (string-length ks))))
(printf "~a<~a>\n" m s)
(output val e)
(printf "~a</~a>\n" m s)))
(define (xml-options n e)
;; display the true options
(let ((opts (filter (lambda (o)
(and (keyword? (car o))
(not (xml-attribute? (cadr o)))))
(markup-options n))))
(if (pair? opts)
(let ((m (make-margin)))
(display m)
(display "<options>\n")
(set! xml-margin (+ xml-margin 1))
(for-each (lambda (o)
(xml-option (car o) (cadr o) e))
opts)
(set! xml-margin (- xml-margin 1))
(display m)
(display "</options>\n")))))
(markup-writer #t
:options 'all
:before (lambda (n e)
(printf "~a<~a" (make-margin) (markup-markup n))
;; display the xml attributes
(for-each (lambda (o)
(if (and (keyword? (car o))
(xml-attribute? (cadr o)))
(xml-attribute (car o) (cadr o))))
(markup-options n))
(set! xml-margin (+ xml-margin 1))
(display ">\n"))
:action (lambda (n e)
;; options
(xml-options n e)
;; body
(output (markup-body n) e))
:after (lambda (n e)
(printf "~a</~a>\n" (make-margin) (markup-markup n))
(set! xml-margin (- xml-margin 1)))))
;*---------------------------------------------------------------------*/
;* Restore the base engine */
;*---------------------------------------------------------------------*/
(default-engine-set! (find-engine 'base))
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