LibWeb: Implement Range.commonAncestorContainer

orospakr · Feb 25, 2022 · c25d653 · c25d653
1 parent aec0e54
commit c25d653
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Showing 3 changed files with 20 additions and 0 deletions.
diff --git a/Userland/Libraries/LibWeb/DOM/Range.cpp b/Userland/Libraries/LibWeb/DOM/Range.cpp
@@ -68,4 +68,20 @@ NonnullRefPtr<Range> Range::normalized() const
  return inverted();
 }
 
+// https://dom.spec.whatwg.org/#dom-range-commonancestorcontainer
+NonnullRefPtr<Node> Range::common_ancestor_container() const
+{
+ // 1. Let container be start node.
+ auto container = m_start_container;
+
+ // 2. While container is not an inclusive ancestor of end node, let container be container’s parent.
+ while (!container->is_inclusive_ancestor_of(m_end_container)) {
+ VERIFY(container->parent());
+ container = *container->parent();
+ }
+
+ // 3. Return container.
+ return container;
+}
+
 }
diff --git a/Userland/Libraries/LibWeb/DOM/Range.h b/Userland/Libraries/LibWeb/DOM/Range.h
@@ -55,6 +55,8 @@ class Range final
  NonnullRefPtr<Range> normalized() const;
  NonnullRefPtr<Range> clone_range() const;
 
+ NonnullRefPtr<Node> common_ancestor_container() const;
+
 private:
  explicit Range(Document&);
 

diff --git a/Userland/Libraries/LibWeb/DOM/Range.idl b/Userland/Libraries/LibWeb/DOM/Range.idl
@@ -6,6 +6,8 @@ interface Range {
 
  readonly attribute boolean collapsed;
 
+ readonly attribute Node commonAncestorContainer;
+
  readonly attribute Node startContainer;
  readonly attribute unsigned long startOffset;
  readonly attribute Node endContainer;