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#include <LibHTML/CSS/StyleResolver.h>
#include <LibHTML/CSS/StyleSheet.h>
#include <LibHTML/DOM/Document.h>
#include <LibHTML/DOM/Element.h>
#include <LibHTML/Dump.h>
#include <stdio.h>
StyleResolver::StyleResolver(Document& document)
: m_document(document)
{
}
StyleResolver::~StyleResolver()
{
}
static bool matches(const Selector& selector, const Element& element)
{
// FIXME: Support compound selectors.
ASSERT(selector.components().size() == 1);
auto& component = selector.components().first();
switch (component.type) {
case Selector::Component::Type::Id:
return component.value == element.attribute("id");
case Selector::Component::Type::Class:
return element.has_class(component.value);
case Selector::Component::Type::TagName:
return component.value == element.tag_name();
default:
ASSERT_NOT_REACHED();
}
}
NonnullRefPtrVector<StyleRule> StyleResolver::collect_matching_rules(const Element& element) const
{
NonnullRefPtrVector<StyleRule> matching_rules;
for (auto& sheet : document().stylesheets()) {
for (auto& rule : sheet.rules()) {
for (auto& selector : rule.selectors()) {
if (matches(selector, element)) {
matching_rules.append(rule);
break;
}
}
}
}
#ifdef HTML_DEBUG
printf("Rules matching Element{%p}\n", &element);
for (auto& rule : matching_rules) {
dump_rule(rule);
}
#endif
return matching_rules;
}
StyleProperties StyleResolver::resolve_style(const Element& element, const StyleProperties* parent_properties) const
{
StyleProperties style_properties;
if (parent_properties) {
parent_properties->for_each_property([&](const StringView& name, auto& value) {
// TODO: proper inheritance
if (name.starts_with("font") || name == "white-space")
style_properties.set_property(name, value);
});
}
auto matching_rules = collect_matching_rules(element);
for (auto& rule : matching_rules) {
for (auto& declaration : rule.declarations()) {
style_properties.set_property(declaration.property_name(), declaration.value());
}
}
return style_properties;
}
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