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;;;; -*- mode: lisp -*-
;;;;
;;;; $Id: lxml-dom.lisp,v 1.6 2005-11-20 14:34:15 scaekenberghe Exp $
;;;;
;;;; LXML implementation of the generic DOM parser and printer.
;;;;
;;;; Copyright (C) 2002, 2004 Sven Van Caekenberghe, Beta Nine BVBA.
;;;;
;;;; You are granted the rights to distribute and use this software
;;;; as governed by the terms of the Lisp Lesser General Public License
;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
(in-package :s-xml)
;;; the lxml hooks to generate lxml
(defun lxml-new-element-hook (name attributes seed)
(declare (ignore name attributes seed))
'())
(defun lxml-finish-element-hook (name attributes parent-seed seed)
(let ((xml-element
(cond ((and (null seed) (null attributes))
name)
(attributes
`((,name ,@(let (list)
(dolist (attribute attributes list)
(push (cdr attribute) list)
(push (car attribute) list))))
,@(nreverse seed)))
(t
`(,name ,@(nreverse seed))))))
(cons xml-element parent-seed)))
(defun lxml-text-hook (string seed)
(cons string seed))
;;; standard DOM interfaces
(defmethod parse-xml-dom (stream (output-type (eql :lxml)))
(car (start-parse-xml stream
(make-instance 'xml-parser-state
:new-element-hook #'lxml-new-element-hook
:finish-element-hook #'lxml-finish-element-hook
:text-hook #'lxml-text-hook))))
(defun plist->alist (plist)
(when plist
(cons (cons (first plist) (second plist))
(plist->alist (rest (rest plist))))))
(defmethod print-xml-dom (dom (input-type (eql :lxml)) stream pretty level)
(declare (special *namespaces*))
(cond ((symbolp dom) (print-solitary-tag dom stream))
((stringp dom) (print-string-xml dom stream))
((consp dom)
(let (tag attributes)
(cond ((symbolp (first dom)) (setf tag (first dom)))
((consp (first dom)) (setf tag (first (first dom))
attributes (plist->alist (rest (first dom)))))
(t (error "Input not recognized as LXML ~s" dom)))
(let ((*namespaces* (extend-namespaces attributes *namespaces*)))
(write-char #\< stream)
(print-identifier tag stream)
(loop :for (name . value) :in attributes
:do (print-attribute name value stream))
(if (rest dom)
(let ((children (rest dom)))
(write-char #\> stream)
(if (and (= (length children) 1) (stringp (first children)))
(print-string-xml (first children) stream)
(progn
(dolist (child children)
(when pretty (print-spaces (* 2 level) stream))
(if (stringp child)
(print-string-xml child stream)
(print-xml-dom child input-type stream pretty (1+ level))))
(when pretty (print-spaces (* 2 (1- level)) stream))))
(print-closing-tag tag stream))
(write-string "/>" stream)))))
(t (error "Input not recognized as LXML ~s" dom))))
;;;; eof
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