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LibHTML: Add Node::first_ancestor_of_type<T>()

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Here's another helper for finding the first ancestor of a Node of a
specific type.
This commit is contained in:
Andreas Kling 2019-10-06 21:07:36 +02:00
parent 03725c6135
commit a239ef34d5
2 changed files with 15 additions and 6 deletions
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8
Libraries/LibHTML/DOM/Node.cpp
View file

@ -56,16 +56,12 @@ RefPtr<LayoutNode> Node::create_layout_tree(const StyleResolver& resolver, const
const HTMLAnchorElement* Node::enclosing_link_element() const const HTMLAnchorElement* Node::enclosing_link_element() const
{ {
if (is<HTMLAnchorElement>(*this)) return first_ancestor_of_type<HTMLAnchorElement>();
return static_cast<const HTMLAnchorElement*>(this);
return parent() ? parent()->enclosing_link_element() : nullptr;
} }
const HTMLElement* Node::enclosing_html_element() const const HTMLElement* Node::enclosing_html_element() const
{ {
if (is_html_element()) return first_ancestor_of_type<HTMLElement>();
return static_cast<const HTMLElement*>(this);
return parent() ? parent()->enclosing_html_element() : nullptr;
} }
String Node::text_content() const String Node::text_content() const

13
Libraries/LibHTML/DOM/Node.h
View file

@ -50,6 +50,9 @@ public:
template<typename T> template<typename T>
const T* first_child_of_type() const; const T* first_child_of_type() const;
template<typename T>
const T* first_ancestor_of_type() const;
virtual void inserted_into(Node&) {} virtual void inserted_into(Node&) {}
virtual void removed_from(Node&) {} virtual void removed_from(Node&) {}
@ -130,3 +133,13 @@ inline const T* Node::first_child_of_type() const
} }
return nullptr; return nullptr;
} }
template<typename T>
inline const T* Node::first_ancestor_of_type() const
{
for (auto* ancestor = parent(); ancestor; ancestor = ancestor->parent()) {
if (is<T>(*ancestor))
return to<T>(ancestor);
}
return nullptr;
}