X-Git-Url: https://code.delx.au/gnu-emacs/blobdiff_plain/ac5475dacb20d240db27d56199910d8a6fcc90e8..1650d7102ae8ea943e4197b7d91198640f0e0ff6:/lisp/dom.el

diff --git a/lisp/dom.el b/lisp/dom.el
index 11357e8880..cf3a02a51d 100644
--- a/lisp/dom.el
+++ b/lisp/dom.el
@@ -1,6 +1,6 @@
 ;;; dom.el --- XML/HTML (etc.) DOM manipulation and searching functions
 
-;; Copyright (C) 2014-2015 Free Software Foundation, Inc.
+;; Copyright (C) 2014-2016 Free Software Foundation, Inc.
 
 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
 ;; Keywords: xml, html
@@ -25,6 +25,7 @@
 ;;; Code:
 
 (require 'cl-lib)
+(eval-when-compile (require 'subr-x))
 
 (defsubst dom-tag (node)
   "Return the NODE tag."
@@ -138,6 +139,16 @@ ATTRIBUTE would typically be `class', `id' or the like."
 	(cons dom matches)
       matches)))
 
+(defun dom-remove-node (dom node)
+  "Remove NODE from DOM."
+  ;; If we're removing the top level node, just return nil.
+  (dolist (child (dom-children dom))
+    (cond
+     ((eq node child)
+      (delq node dom))
+     ((not (stringp child))
+      (dom-remove-node child node)))))
+
 (defun dom-parent (dom node)
   "Return the parent of NODE in DOM."
   (if (memq node (dom-children dom))
@@ -149,6 +160,17 @@ ATTRIBUTE would typically be `class', `id' or the like."
 	  (setq result (dom-parent elem node))))
       result)))
 
+(defun dom-previous-sibling (dom node)
+  "Return the previous sibling of NODE in DOM."
+  (when-let (parent (dom-parent dom node))
+    (let ((siblings (dom-children parent))
+	  (previous nil))
+      (while siblings
+	(when (eq (cadr siblings) node)
+	  (setq previous (car siblings)))
+	(pop siblings))
+      previous)))
+
 (defun dom-node (tag &optional attributes &rest children)
   "Return a DOM node with TAG and ATTRIBUTES."
   (if children