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LibWeb: Support Element.matches(selectors)

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This returns whether an element matches any of a set of selectors.
This commit is contained in:
Andreas Kling 2021-09-30 02:16:36 +02:00
parent 439be913cf
commit 9d852623f2
3 changed files with 20 additions and 0 deletions
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16
Userland/Libraries/LibWeb/DOM/Element.cpp
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@ -9,6 +9,7 @@
#include <LibWeb/CSS/Parser/Parser.h>
#include <LibWeb/CSS/PropertyID.h>
#include <LibWeb/CSS/ResolvedCSSStyleDeclaration.h>
#include <LibWeb/CSS/SelectorEngine.h>
#include <LibWeb/CSS/StyleInvalidator.h>
#include <LibWeb/DOM/DOMException.h>
#include <LibWeb/DOM/Document.h>
@ -247,6 +248,21 @@ NonnullRefPtr<CSS::StyleProperties> Element::computed_style()
return properties;
}
// https://dom.spec.whatwg.org/#dom-element-matches
DOM::ExceptionOr<bool> Element::matches(StringView selectors) const
{
auto maybe_selectors = parse_selector(CSS::ParsingContext(static_cast<ParentNode&>(const_cast<Element&>(*this))), selectors);
if (!maybe_selectors.has_value())
return DOM::SyntaxError::create("Failed to parse selector");
auto sel = maybe_selectors.value();
for (auto& s : sel) {
if (SelectorEngine::matches(s, *this))
return true;
}
return false;
}
ExceptionOr<void> Element::set_inner_html(String const& markup)
{
auto result = DOMParsing::InnerHTML::inner_html_setter(*this, markup);

2
Userland/Libraries/LibWeb/DOM/Element.h
View file

@ -56,6 +56,8 @@ public:
void remove_attribute(const FlyString& name);
size_t attribute_list_size() const { return m_attributes.size(); }
DOM::ExceptionOr<bool> matches(StringView selectors) const;
template<typename Callback>
void for_each_attribute(Callback callback) const
{

2
Userland/Libraries/LibWeb/DOM/Element.idl
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@ -20,6 +20,8 @@ interface Element : Node {
[Reflect] attribute DOMString id;
[Reflect=class] attribute DOMString className;
boolean matches(DOMString selectors);
readonly attribute Element? nextElementSibling;
readonly attribute Element? previousElementSibling;