[PATCH v2 7/9] mshtml: Implement previousElementSibling for Elements.

[Gabriel Ivăncescu]

From: Gabriel Ivăncescu

Signed-off-by: Gabriel Ivăncescu 
---
 dlls/mshtml/htmlelem.c   | 26 ++++++++++++++++++++++++--
 dlls/mshtml/tests/dom.js |  4 ++++
 2 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/dlls/mshtml/htmlelem.c b/dlls/mshtml/htmlelem.c
index cfcbc5dc795..00621dfa805 100644
--- a/dlls/mshtml/htmlelem.c
+++ b/dlls/mshtml/htmlelem.c
@@ -6578,8 +6578,30 @@ static HRESULT WINAPI ElementTraversal_get_lastElementChild(IElementTraversal *i
 static HRESULT WINAPI ElementTraversal_get_previousElementSibling(IElementTraversal *iface, IHTMLElement **p)
 {
     HTMLElement *This = impl_from_IElementTraversal(iface);
-    FIXME("(%p)->(%p)\n", This, p);
-    return E_NOTIMPL;
+    nsIDOMElement *nselem = NULL;
+    HTMLElement *elem;
+    HRESULT hres;
+
+    TRACE("(%p)->(%p)\n", This, p);
+
+    if(!This->dom_element) {
+        *p = NULL;
+        return S_OK;
+    }
+
+    nsIDOMElement_GetPreviousElementSibling(This->dom_element, &nselem);
+    if(!nselem) {
+        *p = NULL;
+        return S_OK;
+    }
+
+    hres = get_element(nselem, &elem);
+    nsIDOMElement_Release(nselem);
+    if(FAILED(hres))
+        return hres;
+
+    *p = &elem->IHTMLElement_iface;
+    return S_OK;
 }

static HRESULT WINAPI ElementTraversal_get_nextElementSibling(IElementTraversal *iface, IHTMLElement **p)
diff --git a/dlls/mshtml/tests/dom.js b/dlls/mshtml/tests/dom.js
index e164c9502ff..93b4dc196ec 100644
--- a/dlls/mshtml/tests/dom.js
+++ b/dlls/mshtml/tests/dom.js
@@ -98,6 +98,10 @@ sync_test("ElementTraversal", function() {
             "div.firstElementChild.nextElementSibling.outerHTML = " + div.firstElementChild.nextElementSibling.outerHTML);
     ok(div.lastElementChild.nextElementSibling === null,
             "div.lastElementChild.nextElementSibling = " + div.lastElementChild.nextElementSibling);
+    ok(div.lastElementChild.previousElementSibling.outerHTML === "<script>/* */</script>",
+            "div.lastElementChild.previousElementSibling.outerHTML = " + div.lastElementChild.previousElementSibling.outerHTML);
+    ok(div.firstElementChild.previousElementSibling === null,
+            "div.firstElementChild.previousElementSibling = " + div.firstElementChild.previousElementSibling);

div.innerHTML = "abc";
     ok(div.firstElementChild === null, "div.firstElementChild = " + div.firstElementChild);