mshtml: Implement IHTMLDOMNode previousSibling.

dlls/mshtml/htmlnode.c

@@ -782,8 +782,26 @@ static HRESULT WINAPI HTMLDOMNode_get_lastChild(IHTMLDOMNode *iface, IHTMLDOMNod
 static HRESULT WINAPI HTMLDOMNode_get_previousSibling(IHTMLDOMNode *iface, IHTMLDOMNode **p)
 {
     HTMLDOMNode *This = impl_from_IHTMLDOMNode(iface);
-    FIXME("(%p)->(%p)\n", This, p);
-    return E_NOTIMPL;
+    nsIDOMNode *nschild = NULL;
+    HTMLDOMNode *node;
+    HRESULT hres;
+
+    TRACE("(%p)->(%p)\n", This, p);
+
+    nsIDOMNode_GetPreviousSibling(This->nsnode, &nschild);
+    if(!nschild) {
+        *p = NULL;
+        return S_OK;
+    }
+
+    hres = get_node(This->doc, nschild, TRUE, &node);
+    nsIDOMNode_Release(nschild);
+    if(FAILED(hres))
+        return hres;
+
+    *p = &node->IHTMLDOMNode_iface;
+    IHTMLDOMNode_AddRef(*p);
+    return S_OK;
 }
 
 static HRESULT WINAPI HTMLDOMNode_get_nextSibling(IHTMLDOMNode *iface, IHTMLDOMNode **p)

dlls/mshtml/tests/dom.c

@@ -1989,6 +1989,20 @@ static IHTMLDOMNode *_node_get_next(unsigned line, IUnknown *unk)
     return next;
 }
 
+#define node_get_prev(u) _node_get_prev(__LINE__,u)
+static IHTMLDOMNode *_node_get_prev(unsigned line, IUnknown *unk)
+{
+    IHTMLDOMNode *node = _get_node_iface(line, unk);
+    IHTMLDOMNode *prev;
+    HRESULT hres;
+
+    hres = IHTMLDOMNode_get_previousSibling(node, &prev);
+    IHTMLDOMNode_Release(node);
+    ok_(__FILE__,line) (hres == S_OK, "get_previousSibling failed: %08x\n", hres);
+
+    return prev;
+}
+
 #define test_elem_get_parent(u) _test_elem_get_parent(__LINE__,u)
 static IHTMLElement *_test_elem_get_parent(unsigned line, IUnknown *unk)
 {
@@ -6681,9 +6695,16 @@ static void test_elems(IHTMLDocument2 *doc)
         node = get_child_item(child_col, 0);
         ok(node != NULL, "node == NULL\n");
         if(node) {
+            IHTMLDOMNode *prev;
+
             type = get_node_type((IUnknown*)node);
             ok(type == 3, "type=%d\n", type);
             node2 = node_get_next((IUnknown*)node);
+
+            prev = node_get_prev((IUnknown*)node2);
+            ok(iface_cmp((IUnknown*)node, (IUnknown*)prev), "node != prev\n");
+            IHTMLDOMNode_Release(prev);
+
             IHTMLDOMNode_Release(node);
         }