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LibWeb/DOM: Implement Node.lookupPrefix

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Adds https://dom.spec.whatwg.org/#dom-node-lookupprefix
This commit is contained in:
Ángel Carias 2024-07-27 12:51:36 -06:00 • committed by Tim Ledbetter
commit 9624e0d2a2
Notes: github-actions[bot] 2024-07-27 23:52:45 +00:00
7 changed files with 109 additions and 1 deletions
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51
Userland/Libraries/LibWeb/DOM/Node.cpp
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@ -1736,6 +1736,57 @@ Optional<String> Node::lookup_namespace_uri(Optional<String> prefix) const
return locate_a_namespace(prefix);
}
// https://dom.spec.whatwg.org/#dom-node-lookupprefix
Optional<String> Node::lookup_prefix(Optional<String> namespace_) const
{
// 1. If namespace is null or the empty string, then return null.
if (!namespace_.has_value() || namespace_->is_empty())
return {};
// 2. Switch on the interface this implements:
// Element
if (is<Element>(*this)) {
// Return the result of locating a namespace prefix for it using namespace.
auto& element = verify_cast<Element>(*this);
return element.locate_a_namespace_prefix(namespace_);
}
// Document
if (is<Document>(*this)) {
// Return the result of locating a namespace prefix for its document element, if its document element is non-null; otherwise null.
auto* document_element = verify_cast<Document>(*this).document_element();
if (!document_element)
return {};
return document_element->locate_a_namespace_prefix(namespace_);
}
// DocumentType
// DocumentFragment
if (is<DocumentType>(*this) || is<DocumentFragment>(*this))
// Return null
return {};
// Attr
if (is<Attr>(*this)) {
// Return the result of locating a namespace prefix for its element, if its element is non-null; otherwise null.
auto* element = verify_cast<Attr>(*this).owner_element();
if (!element)
return {};
return element->locate_a_namespace_prefix(namespace_);
}
// Otherwise
// Return the result of locating a namespace prefix for its parent element, if its parent element is non-null; otherwise null.
auto* parent_element = this->parent_element();
if (!parent_element)
return {};
return parent_element->locate_a_namespace_prefix(namespace_);
}
// https://dom.spec.whatwg.org/#dom-node-isdefaultnamespace
bool Node::is_default_namespace(Optional<String> namespace_) const
{