Added release method to simple exclude node from document

Author: Aleksei Konovkin

xmlua/element.lua

@@ -255,6 +255,11 @@ function methods:insert_element(position, name, attributes)
   end
 end
 
+function methods:release()
+  local released_node = Node.release(self)
+  return Element.new(nil, released_node)
+end
+
 function methods:unlink()
   local unlinked_node = Node.unlink(self)
   return Element.new(nil, unlinked_node)

xmlua/libxml2.lua

@@ -576,6 +576,10 @@ function libxml2.xmlUnlinkNode(node)
   return ffi.gc(node, xml2.xmlFreeNode)
 end
 
+function libxml2.xmlReleaseNode(node)
+  xml2.xmlUnlinkNode(node)
+  return ffi.gc(node, xml2.xmlFreeNode)
+end
 
 function libxml2.xmlBufferCreate()
   return ffi.gc(xml2.xmlBufferCreate(), xml2.xmlBufferFree)

xmlua/node-set.lua

@@ -121,6 +121,12 @@ function methods:unlink()
   end
 end
 
+function methods:release()
+  for _, node in ipairs(self) do
+    node:release()
+  end
+end
+
 local function is_included(node_set, search_node)
   for _, node in ipairs(node_set) do
     if node.node == search_node.node then

xmlua/node.lua

@@ -38,4 +38,9 @@ end
 function Node:unlink()
   return libxml2.xmlUnlinkNode(self.node)
 end
+
+function Node:release()
+  return libxml2.xmlReleaseNode(self.node)
+end
+
 return Node