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LibHTML: Add Document::get_element_by_id() and get_elements_by_name()

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These will be useful for implementing various things. They don't do any
caching at the moment, but that might become valuable in the future.

To facilitate this change, I also made it possible to abort a tree walk
with for_each_in_subtree() by returning IterationDecision::Break from
the callback.
This commit is contained in:
Andreas Kling 2019-10-21 12:01:30 +02:00
parent 465a33443c
commit 4d9740ecef
5 changed files with 57 additions and 11 deletions
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21
Libraries/LibHTML/TreeNode.h
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@ -54,12 +54,27 @@ public:
bool is_child_allowed(const T&) const { return true; }
template<typename Callback>
void for_each_in_subtree(Callback callback)
IterationDecision for_each_in_subtree(Callback callback) const
{
callback(static_cast<T&>(*this));
if (callback(static_cast<const T&>(*this)) == IterationDecision::Break)
return IterationDecision::Break;
for (auto* child = first_child(); child; child = child->next_sibling()) {
child->for_each_in_subtree(callback);
if (child->for_each_in_subtree(callback) == IterationDecision::Break)
return IterationDecision::Break;
}
return IterationDecision::Continue;
}
template<typename Callback>
IterationDecision for_each_in_subtree(Callback callback)
{
if (callback(static_cast<T&>(*this)) == IterationDecision::Break)
return IterationDecision::Break;
for (auto* child = first_child(); child; child = child->next_sibling()) {
if (child->for_each_in_subtree(callback) == IterationDecision::Break)
return IterationDecision::Break;
}
return IterationDecision::Continue;
}
protected: