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@@ -2905,40 +2905,48 @@ void Element::inherit_counters()
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// https://html.spec.whatwg.org/multipage/dom.html#the-lang-and-xml:lang-attributes
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Optional<String> Element::lang() const
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{
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- // 1. If the node is an element that has a lang attribute in the XML namespace set
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- // Use the value of that attribute.
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- auto maybe_xml_lang = get_attribute_ns(Namespace::XML, HTML::AttributeNames::lang);
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- if (maybe_xml_lang.has_value())
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- return maybe_xml_lang.release_value();
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-
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- // 2. If the node is an HTML element or an element in the SVG namespace, and it has a lang in no namespace attribute set
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- // Use the value of that attribute.
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- if (is_html_element() || namespace_uri() == Namespace::SVG) {
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- auto maybe_lang = get_attribute(HTML::AttributeNames::lang);
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- if (maybe_lang.has_value())
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- return maybe_lang.release_value();
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- }
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-
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- // 3. If the node's parent is a shadow root
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- // Use the language of that shadow root's host.
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- if (auto const* parent = parent_element()) {
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- if (parent->is_shadow_root())
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- return parent->shadow_root()->host()->lang();
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- }
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-
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- // 4. If the node's parent element is not null
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- // Use the language of that parent element.
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- if (auto const* parent = parent_element())
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- return parent->lang();
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-
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- // 5. Otherwise
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- // - If there is a pragma-set default language set, then that is the language of the node.
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- // - If there is no pragma-set default language set, then language information from a higher-level protocol (such as HTTP),
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- // if any, must be used as the final fallback language instead.
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- // - In the absence of any such language information, and in cases where the higher-level protocol reports multiple languages,
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- // the language of the node is unknown, and the corresponding language tag is the empty string.
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- // Default locale sounds like a reasonable fallback here.
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- return {};
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+ auto attempt_to_determine_lang_attribute = [&]() -> Optional<String> {
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+ // 1. If the node is an element that has a lang attribute in the XML namespace set
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+ // Use the value of that attribute.
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+ auto maybe_xml_lang = get_attribute_ns(Namespace::XML, HTML::AttributeNames::lang);
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+ if (maybe_xml_lang.has_value())
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+ return maybe_xml_lang.release_value();
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+
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+ // 2. If the node is an HTML element or an element in the SVG namespace, and it has a lang in no namespace attribute set
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+ // Use the value of that attribute.
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+ if (is_html_element() || namespace_uri() == Namespace::SVG) {
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+ auto maybe_lang = get_attribute(HTML::AttributeNames::lang);
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+ if (maybe_lang.has_value())
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+ return maybe_lang.release_value();
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+ }
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+
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+ // 3. If the node's parent is a shadow root
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+ // Use the language of that shadow root's host.
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+ if (auto const* parent = parent_element()) {
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+ if (parent->is_shadow_root())
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+ return parent->shadow_root()->host()->lang();
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+ }
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+
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+ // 4. If the node's parent element is not null
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+ // Use the language of that parent element.
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+ if (auto const* parent = parent_element())
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+ return parent->lang();
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+
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+ // 5. Otherwise
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+ // - If there is a pragma-set default language set, then that is the language of the node.
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+ // - If there is no pragma-set default language set, then language information from a higher-level protocol (such as HTTP),
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+ // if any, must be used as the final fallback language instead.
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+ // - In the absence of any such language information, and in cases where the higher-level protocol reports multiple languages,
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+ // the language of the node is unknown, and the corresponding language tag is the empty string.
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+ // Default locale sounds like a reasonable fallback here.
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+ return {};
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+ };
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+
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+ // If the resulting value is the empty string, then it must be interpreted as meaning that the language of the node is explicitly unknown.
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+ auto maybe_lang = attempt_to_determine_lang_attribute();
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+ if (!maybe_lang.has_value() || maybe_lang->is_empty())
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+ return {};
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+ return maybe_lang.release_value();
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}
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}
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Piotr