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-rw-r--r--dom/base/nsContentUtils.cpp16
-rw-r--r--dom/base/nsContentUtils.h8
2 files changed, 23 insertions, 1 deletions
diff --git a/dom/base/nsContentUtils.cpp b/dom/base/nsContentUtils.cpp
index 1a3f5b5ca..ffe50a015 100644
--- a/dom/base/nsContentUtils.cpp
+++ b/dom/base/nsContentUtils.cpp
@@ -9843,4 +9843,18 @@ nsContentUtils::IsLocalRefURL(const nsString& aString)
}
return false;
-} \ No newline at end of file
+}
+
+/* static */ uint32_t
+nsContentUtils::GetNodeDepth(nsINode* aNode)
+{
+ uint32_t depth = 1;
+
+ MOZ_ASSERT(aNode, "Node shouldn't be null");
+
+ while ((aNode = aNode->GetParentNode())) {
+ ++depth;
+ }
+
+ return depth;
+}
diff --git a/dom/base/nsContentUtils.h b/dom/base/nsContentUtils.h
index ffbd15e78..08587b5e4 100644
--- a/dom/base/nsContentUtils.h
+++ b/dom/base/nsContentUtils.h
@@ -2745,6 +2745,14 @@ public:
static bool
IsLocalRefURL(const nsString& aString);
+ /**
+ * Returns the length of the parent-traversal path (in terms of the number of
+ * nodes) to an unparented/root node from aNode. An unparented/root node is
+ * considered to have a depth of 1, its children have a depth of 2, etc.
+ * aNode is expected to be non-null.
+ */
+ static uint32_t GetNodeDepth(nsINode* aNode);
+
private:
static bool InitializeEventTable();