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LibWeb: Add preceding and following Node cases in tree constraints

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This also does some east-const changes in TreeNode.
This commit is contained in:
Luke Wilde 2021-09-07 08:15:34 +01:00 • committed by Andreas Kling
parent 24ed8511dd
commit 1a28fc3cb5
2 changed files with 47 additions and 8 deletions
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43
Userland/Libraries/LibWeb/TreeNode.h
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@ -137,12 +137,29 @@ public:
return node;
}
const T* next_in_pre_order() const
T const* next_in_pre_order() const
{
return const_cast<TreeNode*>(this)->next_in_pre_order();
}
bool is_before(const T& other) const
T* previous_in_pre_order()
{
if (auto* node = previous_sibling()) {
while (node->last_child())
node = node->last_child();
return node;
}
return parent();
}
T const* previous_in_pre_order() const
{
return const_cast<TreeNode*>(this)->previous_in_pre_order();
}
bool is_before(T const& other) const
{
if (this == &other)
return false;
@ -153,6 +170,28 @@ public:
return false;
}
// https://dom.spec.whatwg.org/#concept-tree-preceding (Object A is 'typename U' and Object B is 'this')
template<typename U>
bool has_preceding_node_of_type_in_tree_order() const
{
for (auto* node = previous_in_pre_order(); node; node = node->previous_in_pre_order()) {
if (is<U>(node))
return true;
}
return false;
}
// https://dom.spec.whatwg.org/#concept-tree-following (Object A is 'typename U' and Object B is 'this')
template<typename U>
bool has_following_node_of_type_in_tree_order() const
{
for (auto* node = next_in_pre_order(); node; node = node->next_in_pre_order()) {
if (is<U>(node))
return true;
}
return false;
}
template<typename Callback>
IterationDecision for_each_in_inclusive_subtree(Callback callback) const
{