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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/HashMap.h>
#include <AK/NonnullRefPtrVector.h>
#include <AK/OwnPtr.h>
#include <LibWeb/CSS/CSSStyleDeclaration.h>
#include <LibWeb/CSS/Parser/StyleComponentValueRule.h>
#include <LibWeb/CSS/StyleProperties.h>
#include <LibWeb/Forward.h>
namespace Web::CSS {
struct MatchingRule {
RefPtr<CSSStyleRule> rule;
size_t style_sheet_index { 0 };
size_t rule_index { 0 };
size_t selector_index { 0 };
u32 specificity { 0 };
};
class PropertyDependencyNode : public RefCounted<PropertyDependencyNode> {
public:
static NonnullRefPtr<PropertyDependencyNode> create(String name)
{
return adopt_ref(*new PropertyDependencyNode(move(name)));
}
void add_child(NonnullRefPtr<PropertyDependencyNode>);
bool has_cycles();
private:
explicit PropertyDependencyNode(String name);
String m_name;
NonnullRefPtrVector<PropertyDependencyNode> m_children;
bool m_marked { false };
};
class StyleComputer {
public:
explicit StyleComputer(DOM::Document&);
~StyleComputer();
DOM::Document& document() { return m_document; }
DOM::Document const& document() const { return m_document; }
NonnullRefPtr<StyleProperties> create_document_style() const;
NonnullRefPtr<StyleProperties> compute_style(DOM::Element&) const;
// https://www.w3.org/TR/css-cascade/#origin
enum class CascadeOrigin {
Author,
User,
UserAgent,
Animation,
Transition,
};
Vector<MatchingRule> collect_matching_rules(DOM::Element const&, CascadeOrigin) const;
void invalidate_rule_cache();
private:
void compute_cascaded_values(StyleProperties&, DOM::Element&) const;
void compute_font(StyleProperties&, DOM::Element const*) const;
void compute_defaulted_values(StyleProperties&, DOM::Element const*) const;
void absolutize_values(StyleProperties&, DOM::Element const*) const;
void transform_box_type_if_needed(StyleProperties&, DOM::Element const&) const;
void compute_defaulted_property_value(StyleProperties&, DOM::Element const*, CSS::PropertyID) const;
RefPtr<StyleValue> resolve_unresolved_style_value(DOM::Element&, PropertyID, UnresolvedStyleValue const&, HashMap<String, StyleProperty const*> const&) const;
bool expand_unresolved_values(DOM::Element&, StringView property_name, HashMap<String, NonnullRefPtr<PropertyDependencyNode>>& dependencies, Vector<StyleComponentValueRule> const& source, Vector<StyleComponentValueRule>& dest, size_t source_start_index, HashMap<String, StyleProperty const*> const& custom_properties) const;
template<typename Callback>
void for_each_stylesheet(CascadeOrigin, Callback) const;
struct MatchingRuleSet {
Vector<MatchingRule> user_agent_rules;
Vector<MatchingRule> author_rules;
};
void cascade_declarations(StyleProperties&, DOM::Element&, Vector<MatchingRule> const&, CascadeOrigin, bool important, HashMap<String, StyleProperty const*> const&) const;
void build_rule_cache();
void build_rule_cache_if_needed() const;
DOM::Document& m_document;
struct RuleCache {
HashMap<FlyString, Vector<MatchingRule>> rules_by_id;
HashMap<FlyString, Vector<MatchingRule>> rules_by_class;
HashMap<FlyString, Vector<MatchingRule>> rules_by_tag_name;
Vector<MatchingRule> other_rules;
int generation { 0 };
};
OwnPtr<RuleCache> m_rule_cache;
};
}
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