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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021-2022, Sam Atkins <atkinssj@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/FlyString.h>
#include <AK/NonnullRefPtrVector.h>
#include <AK/RefCounted.h>
#include <AK/String.h>
#include <AK/Vector.h>
namespace Web::CSS {
using SelectorList = NonnullRefPtrVector<class Selector>;
// This is a <complex-selector> in the spec. https://www.w3.org/TR/selectors-4/#complex
class Selector : public RefCounted<Selector> {
public:
enum class PseudoElement {
None,
Before,
After,
FirstLine,
FirstLetter,
Marker,
};
struct SimpleSelector {
enum class Type {
Invalid,
Universal,
TagName,
Id,
Class,
Attribute,
PseudoClass,
PseudoElement,
};
Type type { Type::Invalid };
struct ANPlusBPattern {
int step_size { 0 }; // "A"
int offset = { 0 }; // "B"
String serialize() const
{
return String::formatted("{}n{:+}", step_size, offset);
}
};
struct PseudoClass {
enum class Type {
None,
Link,
Visited,
Hover,
Focus,
FirstChild,
LastChild,
OnlyChild,
Empty,
Root,
FirstOfType,
LastOfType,
OnlyOfType,
NthChild,
NthLastChild,
Disabled,
Enabled,
Checked,
Not,
Active,
};
Type type { Type::None };
// FIXME: We don't need this field on every single SimpleSelector, but it's also annoying to malloc it somewhere.
// Only used when "pseudo_class" is "NthChild" or "NthLastChild".
ANPlusBPattern nth_child_pattern;
SelectorList not_selector {};
};
PseudoClass pseudo_class {};
PseudoElement pseudo_element { PseudoElement::None };
FlyString value {};
struct Attribute {
enum class MatchType {
None,
HasAttribute,
ExactValueMatch,
ContainsWord, // [att~=val]
ContainsString, // [att*=val]
StartsWithSegment, // [att|=val]
StartsWithString, // [att^=val]
EndsWithString, // [att$=val]
};
MatchType match_type { MatchType::None };
FlyString name {};
String value {};
};
Attribute attribute {};
String serialize() const;
};
enum class Combinator {
None,
ImmediateChild, // >
Descendant, // <whitespace>
NextSibling, // +
SubsequentSibling, // ~
Column, // ||
};
struct CompoundSelector {
// Spec-wise, the <combinator> is not part of a <compound-selector>,
// but it is more understandable to put them together.
Combinator combinator { Combinator::None };
Vector<SimpleSelector> simple_selectors;
};
static NonnullRefPtr<Selector> create(Vector<CompoundSelector>&& compound_selectors)
{
return adopt_ref(*new Selector(move(compound_selectors)));
}
~Selector();
Vector<CompoundSelector> const& compound_selectors() const { return m_compound_selectors; }
Optional<PseudoElement> pseudo_element() const;
u32 specificity() const;
String serialize() const;
private:
explicit Selector(Vector<CompoundSelector>&&);
Vector<CompoundSelector> m_compound_selectors;
mutable Optional<u32> m_specificity;
};
constexpr StringView pseudo_element_name(Selector::PseudoElement);
constexpr StringView pseudo_class_name(Selector::SimpleSelector::PseudoClass::Type);
String serialize_a_group_of_selectors(NonnullRefPtrVector<Selector> const& selectors);
}
namespace AK {
template<>
struct Formatter<Web::CSS::Selector> : Formatter<StringView> {
ErrorOr<void> format(FormatBuilder& builder, Web::CSS::Selector const& selector)
{
return Formatter<StringView>::format(builder, selector.serialize());
}
};
}
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