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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibWeb/CSS/SelectorEngine.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/DOM/Element.h>
#include <LibWeb/DOM/Text.h>
#include <LibWeb/HTML/AttributeNames.h>
#include <LibWeb/HTML/HTMLElement.h>
namespace Web::SelectorEngine {
static bool matches_hover_pseudo_class(const DOM::Element& element)
{
auto* hovered_node = element.document().hovered_node();
if (!hovered_node)
return false;
if (&element == hovered_node)
return true;
return element.is_ancestor_of(*hovered_node);
}
static bool matches(const CSS::Selector::SimpleSelector& component, const DOM::Element& element)
{
switch (component.pseudo_element) {
case CSS::Selector::SimpleSelector::PseudoElement::None:
break;
default:
// FIXME: Implement pseudo-elements.
return false;
}
switch (component.pseudo_class) {
case CSS::Selector::SimpleSelector::PseudoClass::None:
break;
case CSS::Selector::SimpleSelector::PseudoClass::Link:
if (!element.is_link())
return false;
break;
case CSS::Selector::SimpleSelector::PseudoClass::Visited:
// FIXME: Maybe match this selector sometimes?
return false;
case CSS::Selector::SimpleSelector::PseudoClass::Hover:
if (!matches_hover_pseudo_class(element))
return false;
break;
case CSS::Selector::SimpleSelector::PseudoClass::Focus:
// FIXME: Implement matches_focus_pseudo_class(element)
return false;
case CSS::Selector::SimpleSelector::PseudoClass::FirstChild:
if (element.previous_element_sibling())
return false;
break;
case CSS::Selector::SimpleSelector::PseudoClass::LastChild:
if (element.next_element_sibling())
return false;
break;
case CSS::Selector::SimpleSelector::PseudoClass::OnlyChild:
if (element.previous_element_sibling() || element.next_element_sibling())
return false;
break;
case CSS::Selector::SimpleSelector::PseudoClass::Empty:
if (element.first_child_of_type<DOM::Element>() || element.first_child_of_type<DOM::Text>())
return false;
break;
case CSS::Selector::SimpleSelector::PseudoClass::Root:
if (!is<HTML::HTMLElement>(element))
return false;
break;
case CSS::Selector::SimpleSelector::PseudoClass::FirstOfType:
for (auto* sibling = element.previous_element_sibling(); sibling; sibling = sibling->previous_element_sibling()) {
if (sibling->tag_name() == element.tag_name())
return false;
}
break;
case CSS::Selector::SimpleSelector::PseudoClass::LastOfType:
for (auto* sibling = element.next_element_sibling(); sibling; sibling = sibling->next_element_sibling()) {
if (sibling->tag_name() == element.tag_name())
return false;
}
break;
}
switch (component.attribute_match_type) {
case CSS::Selector::SimpleSelector::AttributeMatchType::HasAttribute:
if (!element.has_attribute(component.attribute_name))
return false;
break;
case CSS::Selector::SimpleSelector::AttributeMatchType::ExactValueMatch:
if (element.attribute(component.attribute_name) != component.attribute_value)
return false;
break;
case CSS::Selector::SimpleSelector::AttributeMatchType::Contains:
if (!element.attribute(component.attribute_name).split(' ').contains_slow(component.attribute_value))
return false;
break;
default:
break;
}
switch (component.type) {
case CSS::Selector::SimpleSelector::Type::Universal:
return true;
case CSS::Selector::SimpleSelector::Type::Id:
return component.value == element.attribute(HTML::AttributeNames::id);
case CSS::Selector::SimpleSelector::Type::Class:
return element.has_class(component.value);
case CSS::Selector::SimpleSelector::Type::TagName:
return component.value == element.local_name();
default:
VERIFY_NOT_REACHED();
}
}
static bool matches(const CSS::Selector& selector, int component_list_index, const DOM::Element& element)
{
auto& component_list = selector.complex_selectors()[component_list_index];
for (auto& component : component_list.compound_selector) {
if (!matches(component, element))
return false;
}
switch (component_list.relation) {
case CSS::Selector::ComplexSelector::Relation::None:
return true;
case CSS::Selector::ComplexSelector::Relation::Descendant:
VERIFY(component_list_index != 0);
for (auto* ancestor = element.parent(); ancestor; ancestor = ancestor->parent()) {
if (!is<DOM::Element>(*ancestor))
continue;
if (matches(selector, component_list_index - 1, downcast<DOM::Element>(*ancestor)))
return true;
}
return false;
case CSS::Selector::ComplexSelector::Relation::ImmediateChild:
VERIFY(component_list_index != 0);
if (!element.parent() || !is<DOM::Element>(*element.parent()))
return false;
return matches(selector, component_list_index - 1, downcast<DOM::Element>(*element.parent()));
case CSS::Selector::ComplexSelector::Relation::AdjacentSibling:
VERIFY(component_list_index != 0);
if (auto* sibling = element.previous_element_sibling())
return matches(selector, component_list_index - 1, *sibling);
return false;
case CSS::Selector::ComplexSelector::Relation::GeneralSibling:
VERIFY(component_list_index != 0);
for (auto* sibling = element.previous_element_sibling(); sibling; sibling = sibling->previous_element_sibling()) {
if (matches(selector, component_list_index - 1, *sibling))
return true;
}
return false;
}
VERIFY_NOT_REACHED();
}
bool matches(const CSS::Selector& selector, const DOM::Element& element)
{
VERIFY(!selector.complex_selectors().is_empty());
return matches(selector, selector.complex_selectors().size() - 1, element);
}
}
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