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LibWeb: Make Range.setStart and Range.setEnd spec compliant

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These functions are way more involved than simply setting their
respective boundary points :^)
This commit is contained in:
Luke Wilde 2022-01-31 18:05:54 +00:00 • committed by Andreas Kling
parent af3c866898
commit 46ce50f74e
6 changed files with 185 additions and 11 deletions
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25
Userland/Libraries/LibWeb/TreeNode.h
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@ -80,6 +80,16 @@ public:
return const_cast<TreeNode*>(this)->child_at_index(index);
}
// https://dom.spec.whatwg.org/#concept-tree-index
size_t index() const
{
// The index of an object is its number of preceding siblings, or 0 if it has none.
size_t index = 0;
for (auto* node = previous_sibling(); node; node = node->previous_sibling())
++index;
return index;
}
Optional<size_t> index_of_child(const T& search_child)
{
VERIFY(search_child.parent() == this);
@ -118,6 +128,8 @@ public:
bool is_descendant_of(const TreeNode&) const;
bool is_inclusive_descendant_of(const TreeNode&) const;
bool is_following(TreeNode const&) const;
void append_child(NonnullRefPtr<T> node);
void prepend_child(NonnullRefPtr<T> node);
void insert_before(NonnullRefPtr<T> node, RefPtr<T> child);
@ -571,4 +583,17 @@ inline bool TreeNode<T>::is_inclusive_descendant_of(const TreeNode<T>& other) co
return other.is_inclusive_ancestor_of(*this);
}
// https://dom.spec.whatwg.org/#concept-tree-following
template<typename T>
inline bool TreeNode<T>::is_following(TreeNode<T> const& other) const
{
// An object A is following an object B if A and B are in the same tree and A comes after B in tree order.
for (auto* node = previous_in_pre_order(); node; node = node->previous_in_pre_order()) {
if (node == &other)
return true;
}
return false;
}
}