ladybird/Libraries/LibHTML/CSS/Selector.h

/*
 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include <AK/String.h>
#include <AK/Vector.h>
#include <LibHTML/CSS/Specificity.h>

class Selector {
public:
    struct SimpleSelector {
        enum class Type {
            Invalid,
            Universal,
            TagName,
            Id,
            Class,
        };
        Type type { Type::Invalid };

        enum class PseudoClass {
            None,
            Link,
            Hover,
            FirstChild,
            LastChild,
            OnlyChild,
            Empty,
        };
        PseudoClass pseudo_class { PseudoClass::None };

        String value;

        enum class AttributeMatchType {
            None,
            HasAttribute,
            ExactValueMatch,
        };

        AttributeMatchType attribute_match_type { AttributeMatchType::None };
        String attribute_name;
        String attribute_value;
    };

    struct ComplexSelector {
        enum class Relation {
            None,
            ImmediateChild,
            Descendant,
            AdjacentSibling,
            GeneralSibling,
        };
        Relation relation { Relation::None };

        using CompoundSelector = Vector<SimpleSelector>;
        CompoundSelector compound_selector;
    };

    explicit Selector(Vector<ComplexSelector>&&);
    ~Selector();

    const Vector<ComplexSelector>& complex_selectors() const { return m_complex_selectors; }

    Specificity specificity() const;

private:
    Vector<ComplexSelector> m_complex_selectors;
};