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LibWeb/DOM: Implement Node.lookupPrefix
Adds https://dom.spec.whatwg.org/#dom-node-lookupprefix
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github-actions[bot]
2024-07-27 23:52:45 +00:00
Author: https://github.com/aescarias Commit: https://github.com/LadybirdBrowser/ladybird/commit/9624e0d2a2d Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/870 Reviewed-by: https://github.com/tcl3 ✅
9
Tests/LibWeb/Text/expected/DOM/Node-lookupPrefix.txt
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9
Tests/LibWeb/Text/expected/DOM/Node-lookupPrefix.txt
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@ -0,0 +1,9 @@
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Prefix for namespace "test" on document: ex
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Prefix for namespace "test" on document fragment: null
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Prefix for namespace "test" on comment node 0: ex
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Prefix null on document: null
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Prefix for absent namespace "no" on document: null
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Prefix for namespace "def" on child: abc
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Prefix null on child: null
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Prefix for namespace "test" (in parent) on child: ex
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Prefix for namespace "def" (from attribute "x") on child: abc
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21
Tests/LibWeb/Text/input/DOM/Node-lookupPrefix.html
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21
Tests/LibWeb/Text/input/DOM/Node-lookupPrefix.html
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<!DOCTYPE html>
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<script src="../include.js"></script>
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<script>
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test(() => {
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const xmlDoc = new DOMParser().parseFromString(`<root xmlns:ex="test"><!--abc--><child xmlns:abc="def" x="1"></child></root>`, "application/xml");
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const fragment = document.createDocumentFragment();
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println(`Prefix for namespace "test" on document: ${xmlDoc.lookupPrefix("test")}`);
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println(`Prefix for namespace "test" on document fragment: ${fragment.lookupPrefix("test")}`);
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println(`Prefix for namespace "test" on comment node 0: ${xmlDoc.childNodes[0].lookupPrefix("test")}`);
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println(`Prefix null on document: ${xmlDoc.lookupPrefix(null)}`);
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println(`Prefix for absent namespace "no" on document: ${xmlDoc.lookupPrefix("no")}`);
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const child = xmlDoc.querySelector("child");
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println(`Prefix for namespace "def" on child: ${child.lookupPrefix("def")}`);
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println(`Prefix null on child: ${child.lookupPrefix(null)}`);
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println(`Prefix for namespace "test" (in parent) on child: ${child.lookupPrefix("test")}`);
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const attrX = child.getAttributeNode("x");
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println(`Prefix for namespace "def" (from attribute "x") on child: ${attrX.lookupPrefix("def")}`);
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});
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</script>
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@ -2156,6 +2156,30 @@ void Element::set_prefix(Optional<FlyString> value)
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m_qualified_name.set_prefix(move(value));
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}
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// https://dom.spec.whatwg.org/#locate-a-namespace-prefix
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Optional<String> Element::locate_a_namespace_prefix(Optional<String> const& namespace_) const
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{
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// 1. If element’s namespace is namespace and its namespace prefix is non-null, then return its namespace prefix.
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if (this->namespace_uri() == namespace_ && this->prefix().has_value())
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return this->prefix()->to_string();
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// 2. If element has an attribute whose namespace prefix is "xmlns" and value is namespace, then return element’s first such attribute’s local name.
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if (auto* attributes = this->attributes()) {
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for (size_t i = 0; i < attributes->length(); ++i) {
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auto& attr = *attributes->item(i);
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if (attr.prefix() == "xmlns" && attr.value() == namespace_)
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return attr.local_name().to_string();
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}
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}
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// 3. If element’s parent element is not null, then return the result of running locate a namespace prefix on that element using namespace.
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if (auto* parent = this->parent_element())
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return parent->locate_a_namespace_prefix(namespace_);
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// 4. Return null
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return {};
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}
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void Element::for_each_attribute(Function<void(Attr const&)> callback) const
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{
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for (size_t i = 0; i < m_attributes->length(); ++i)
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@ -106,6 +106,8 @@ public:
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void set_prefix(Optional<FlyString> value);
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Optional<String> locate_a_namespace_prefix(Optional<String> const& namespace_) const;
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// NOTE: This is for the JS bindings
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Optional<FlyString> const& namespace_uri() const { return m_qualified_name.namespace_(); }
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@ -1736,6 +1736,57 @@ Optional<String> Node::lookup_namespace_uri(Optional<String> prefix) const
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return locate_a_namespace(prefix);
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}
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// https://dom.spec.whatwg.org/#dom-node-lookupprefix
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Optional<String> Node::lookup_prefix(Optional<String> namespace_) const
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{
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// 1. If namespace is null or the empty string, then return null.
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if (!namespace_.has_value() || namespace_->is_empty())
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return {};
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// 2. Switch on the interface this implements:
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// Element
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if (is<Element>(*this)) {
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// Return the result of locating a namespace prefix for it using namespace.
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auto& element = verify_cast<Element>(*this);
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return element.locate_a_namespace_prefix(namespace_);
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}
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// Document
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if (is<Document>(*this)) {
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// Return the result of locating a namespace prefix for its document element, if its document element is non-null; otherwise null.
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auto* document_element = verify_cast<Document>(*this).document_element();
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if (!document_element)
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return {};
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return document_element->locate_a_namespace_prefix(namespace_);
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}
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// DocumentType
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// DocumentFragment
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if (is<DocumentType>(*this) || is<DocumentFragment>(*this))
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// Return null
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return {};
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// Attr
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if (is<Attr>(*this)) {
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// Return the result of locating a namespace prefix for its element, if its element is non-null; otherwise null.
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auto* element = verify_cast<Attr>(*this).owner_element();
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if (!element)
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return {};
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return element->locate_a_namespace_prefix(namespace_);
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}
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// Otherwise
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// Return the result of locating a namespace prefix for its parent element, if its parent element is non-null; otherwise null.
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auto* parent_element = this->parent_element();
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if (!parent_element)
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return {};
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return parent_element->locate_a_namespace_prefix(namespace_);
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}
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// https://dom.spec.whatwg.org/#dom-node-isdefaultnamespace
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bool Node::is_default_namespace(Optional<String> namespace_) const
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{
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@ -698,6 +698,7 @@ public:
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Optional<String> locate_a_namespace(Optional<String> const& prefix) const;
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Optional<String> lookup_namespace_uri(Optional<String> prefix) const;
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Optional<String> lookup_prefix(Optional<String> namespace_) const;
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bool is_default_namespace(Optional<String> namespace_) const;
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protected:
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@ -54,7 +54,7 @@ interface Node : EventTarget {
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unsigned short compareDocumentPosition(Node? otherNode);
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boolean contains(Node? other);
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[FIXME] DOMString? lookupPrefix(DOMString? namespace);
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DOMString? lookupPrefix(DOMString? namespace);
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DOMString? lookupNamespaceURI(DOMString? prefix);
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boolean isDefaultNamespace(DOMString? namespace);
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