ladybird/Userland/Libraries/LibWeb/Dump.cpp

/*
 * Copyright (c) 2018-2023, Andreas Kling <kling@serenityos.org>
 * Copyright (c) 2021, the SerenityOS developers.
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include <AK/QuickSort.h>
#include <AK/StringBuilder.h>
#include <AK/Utf8View.h>
#include <LibWeb/CSS/CSSFontFaceRule.h>
#include <LibWeb/CSS/CSSImportRule.h>
#include <LibWeb/CSS/CSSMediaRule.h>
#include <LibWeb/CSS/CSSRule.h>
#include <LibWeb/CSS/CSSStyleRule.h>
#include <LibWeb/CSS/CSSStyleSheet.h>
#include <LibWeb/CSS/CSSSupportsRule.h>
#include <LibWeb/CSS/PropertyID.h>
#include <LibWeb/CSS/PseudoClass.h>
#include <LibWeb/DOM/Comment.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/DOM/Element.h>
#include <LibWeb/DOM/ShadowRoot.h>
#include <LibWeb/DOM/Text.h>
#include <LibWeb/Dump.h>
#include <LibWeb/HTML/DocumentState.h>
#include <LibWeb/HTML/HTMLImageElement.h>
#include <LibWeb/HTML/HTMLTemplateElement.h>
#include <LibWeb/HTML/ImageRequest.h>
#include <LibWeb/HTML/TraversableNavigable.h>
#include <LibWeb/Layout/BlockContainer.h>
#include <LibWeb/Layout/FormattingContext.h>
#include <LibWeb/Layout/FrameBox.h>
#include <LibWeb/Layout/InlineNode.h>
#include <LibWeb/Layout/Node.h>
#include <LibWeb/Layout/SVGBox.h>
#include <LibWeb/Layout/TextNode.h>
#include <LibWeb/Layout/Viewport.h>
#include <LibWeb/Painting/InlinePaintable.h>
#include <LibWeb/Painting/PaintableBox.h>
#include <LibWeb/Painting/TextPaintable.h>
#include <LibWeb/SVG/SVGDecodedImageData.h>
#include <stdio.h>

namespace Web {

static void indent(StringBuilder& builder, int levels)
{
    for (int i = 0; i < levels; i++)
        builder.append("  "sv);
}

static ErrorOr<void> dump_session_history_entry(StringBuilder& builder, HTML::SessionHistoryEntry const& session_history_entry, int indent_levels)
{
    indent(builder, indent_levels);
    auto const& document = session_history_entry.document();
    TRY(builder.try_appendff("step=({}) url=({}) is-active=({})\n", session_history_entry.step().get<int>(), session_history_entry.url(), document && document->is_active()));
    for (auto const& nested_history : session_history_entry.document_state()->nested_histories()) {
        for (auto const& nested_she : nested_history.entries) {
            TRY(dump_session_history_entry(builder, *nested_she, indent_levels + 1));
        }
    }
    return {};
}

void dump_tree(HTML::TraversableNavigable& traversable)
{
    StringBuilder builder;
    for (auto const& she : traversable.session_history_entries()) {
        dump_session_history_entry(builder, *she, 0).release_value_but_fixme_should_propagate_errors();
    }
    dbgln("{}", builder.string_view());
}

void dump_tree(DOM::Node const& node)
{
    StringBuilder builder;
    dump_tree(builder, node);
    dbgln("{}", builder.string_view());
}

void dump_tree(StringBuilder& builder, DOM::Node const& node)
{
    static int indent = 0;
    for (int i = 0; i < indent; ++i)
        builder.append("  "sv);
    if (is<DOM::Element>(node)) {
        builder.appendff("<{}", verify_cast<DOM::Element>(node).local_name());
        verify_cast<DOM::Element>(node).for_each_attribute([&](auto& name, auto& value) {
            builder.appendff(" {}={}", name, value);
        });
        builder.append(">\n"sv);
    } else if (is<DOM::Text>(node)) {
        builder.appendff("\"{}\"\n", verify_cast<DOM::Text>(node).data());
    } else {
        builder.appendff("{}\n", node.node_name());
    }
    ++indent;
    if (is<DOM::Element>(node)) {
        if (auto shadow_root = static_cast<DOM::Element const&>(node).shadow_root()) {
            dump_tree(builder, *shadow_root);
        }
    }
    if (is<HTML::HTMLImageElement>(node)) {
        if (auto image_data = static_cast<HTML::HTMLImageElement const&>(node).current_request().image_data()) {
            if (is<SVG::SVGDecodedImageData>(*image_data)) {
                ++indent;
                for (int i = 0; i < indent; ++i)
                    builder.append("  "sv);
                builder.append("(SVG-as-image isolated context)\n"sv);
                auto& svg_data = verify_cast<SVG::SVGDecodedImageData>(*image_data);
                dump_tree(builder, svg_data.svg_document());
                --indent;
            }
        }
    }
    if (is<DOM::ParentNode>(node)) {
        if (!is<HTML::HTMLTemplateElement>(node)) {
            static_cast<DOM::ParentNode const&>(node).for_each_child([&](auto& child) {
                dump_tree(builder, child);
                return IterationDecision::Continue;
            });
        } else {
            auto& template_element = verify_cast<HTML::HTMLTemplateElement>(node);
            dump_tree(builder, template_element.content());
        }
    }
    --indent;
}

void dump_tree(Layout::Node const& layout_node, bool show_box_model, bool show_specified_style)
{
    StringBuilder builder;
    dump_tree(builder, layout_node, show_box_model, show_specified_style, true);
    dbgln("{}", builder.string_view());
}

void dump_tree(StringBuilder& builder, Layout::Node const& layout_node, bool show_box_model, bool show_specified_style, bool interactive)
{
    static size_t indent = 0;
    for (size_t i = 0; i < indent; ++i)
        builder.append("  "sv);

    FlyString tag_name;
    if (layout_node.is_anonymous())
        tag_name = "(anonymous)"_fly_string;
    else if (is<DOM::Element>(layout_node.dom_node()))
        tag_name = verify_cast<DOM::Element>(*layout_node.dom_node()).local_name();
    else
        tag_name = layout_node.dom_node()->node_name();

    String identifier;
    if (layout_node.dom_node() && is<DOM::Element>(*layout_node.dom_node())) {
        auto& element = verify_cast<DOM::Element>(*layout_node.dom_node());
        StringBuilder builder;
        if (element.id().has_value() && !element.id()->is_empty()) {
            builder.append('#');
            builder.append(*element.id());
        }
        for (auto& class_name : element.class_names()) {
            builder.append('.');
            builder.append(class_name);
        }
        identifier = MUST(builder.to_string());
    }

    StringView nonbox_color_on = ""sv;
    StringView box_color_on = ""sv;
    StringView svg_box_color_on = ""sv;
    StringView positioned_color_on = ""sv;
    StringView floating_color_on = ""sv;
    StringView inline_color_on = ""sv;
    StringView line_box_color_on = ""sv;
    StringView fragment_color_on = ""sv;
    StringView flex_color_on = ""sv;
    StringView table_color_on = ""sv;
    StringView formatting_context_color_on = ""sv;
    StringView color_off = ""sv;

    if (interactive) {
        nonbox_color_on = "\033[33m"sv;
        box_color_on = "\033[34m"sv;
        svg_box_color_on = "\033[31m"sv;
        positioned_color_on = "\033[31;1m"sv;
        floating_color_on = "\033[32;1m"sv;
        inline_color_on = "\033[36;1m"sv;
        line_box_color_on = "\033[34;1m"sv;
        fragment_color_on = "\033[35;1m"sv;
        flex_color_on = "\033[34;1m"sv;
        table_color_on = "\033[91;1m"sv;
        formatting_context_color_on = "\033[37;1m"sv;
        color_off = "\033[0m"sv;
    }

    if (!is<Layout::Box>(layout_node)) {
        builder.appendff("{}{}{} <{}{}{}{}>",
            nonbox_color_on,
            layout_node.class_name(),
            color_off,
            tag_name,
            nonbox_color_on,
            identifier,
            color_off);
        builder.append("\n"sv);
    } else {
        auto& box = verify_cast<Layout::Box>(layout_node);
        StringView color_on = is<Layout::SVGBox>(box) ? svg_box_color_on : box_color_on;

        builder.appendff("{}{}{} <{}{}{}{}> ",
            color_on,
            box.class_name(),
            color_off,
            color_on,
            tag_name,
            color_off,
            identifier);

        if (auto const* paintable_box = box.paintable_box()) {
            builder.appendff("at ({},{}) content-size {}x{}",
                paintable_box->absolute_x(),
                paintable_box->absolute_y(),
                paintable_box->content_width(),
                paintable_box->content_height());
        } else {
            builder.appendff("(not painted)");
        }

        if (box.is_positioned())
            builder.appendff(" {}positioned{}", positioned_color_on, color_off);
        if (box.is_floating())
            builder.appendff(" {}floating{}", floating_color_on, color_off);
        if (box.is_inline_block())
            builder.appendff(" {}inline-block{}", inline_color_on, color_off);
        if (box.is_inline_table())
            builder.appendff(" {}inline-table{}", inline_color_on, color_off);
        if (box.display().is_flex_inside()) {
            StringView direction;
            switch (box.computed_values().flex_direction()) {
            case CSS::FlexDirection::Column:
                direction = "column"sv;
                break;
            case CSS::FlexDirection::ColumnReverse:
                direction = "column-reverse"sv;
                break;
            case CSS::FlexDirection::Row:
                direction = "row"sv;
                break;
            case CSS::FlexDirection::RowReverse:
                direction = "row-reverse"sv;
                break;
            }
            builder.appendff(" {}flex-container({}){}", flex_color_on, direction, color_off);
        }
        if (box.is_flex_item())
            builder.appendff(" {}flex-item{}", flex_color_on, color_off);
        if (box.display().is_table_inside())
            builder.appendff(" {}table-box{}", table_color_on, color_off);
        if (box.display().is_table_row_group())
            builder.appendff(" {}table-row-group{}", table_color_on, color_off);
        if (box.display().is_table_column_group())
            builder.appendff(" {}table-column-group{}", table_color_on, color_off);
        if (box.display().is_table_header_group())
            builder.appendff(" {}table-header-group{}", table_color_on, color_off);
        if (box.display().is_table_footer_group())
            builder.appendff(" {}table-footer-group{}", table_color_on, color_off);
        if (box.display().is_table_row())
            builder.appendff(" {}table-row{}", table_color_on, color_off);
        if (box.display().is_table_cell())
            builder.appendff(" {}table-cell{}", table_color_on, color_off);

        if (show_box_model) {
            // Dump the horizontal box properties
            builder.appendff(" [{}+{}+{} {} {}+{}+{}]",
                box.box_model().margin.left,
                box.box_model().border.left,
                box.box_model().padding.left,
                box.paintable_box() ? box.paintable_box()->content_width() : 0,
                box.box_model().padding.right,
                box.box_model().border.right,
                box.box_model().margin.right);

            // And the vertical box properties
            builder.appendff(" [{}+{}+{} {} {}+{}+{}]",
                box.box_model().margin.top,
                box.box_model().border.top,
                box.box_model().padding.top,
                box.paintable_box() ? box.paintable_box()->content_height() : 0,
                box.box_model().padding.bottom,
                box.box_model().border.bottom,
                box.box_model().margin.bottom);
        }

        if (auto formatting_context_type = Layout::FormattingContext::formatting_context_type_created_by_box(box); formatting_context_type.has_value()) {
            switch (formatting_context_type.value()) {
            case Layout::FormattingContext::Type::Block:
                builder.appendff(" [{}BFC{}]", formatting_context_color_on, color_off);
                break;
            case Layout::FormattingContext::Type::Flex:
                builder.appendff(" [{}FFC{}]", formatting_context_color_on, color_off);
                break;
            case Layout::FormattingContext::Type::Grid:
                builder.appendff(" [{}GFC{}]", formatting_context_color_on, color_off);
                break;
            case Layout::FormattingContext::Type::Table:
                builder.appendff(" [{}TFC{}]", formatting_context_color_on, color_off);
                break;
            case Layout::FormattingContext::Type::SVG:
                builder.appendff(" [{}SVG{}]", formatting_context_color_on, color_off);
                break;
            default:
                break;
            }
        }

        builder.appendff(" children: {}", box.children_are_inline() ? "inline" : "not-inline");

        if (is<Layout::FrameBox>(box)) {
            auto const& frame_box = static_cast<Layout::FrameBox const&>(box);
            if (auto* nested_browsing_context = frame_box.dom_node().nested_browsing_context()) {
                if (auto* document = nested_browsing_context->active_document()) {
                    builder.appendff(" (url: {})", document->url());
                }
            }
        }

        builder.append("\n"sv);
    }

    if (layout_node.dom_node() && is<HTML::HTMLImageElement>(*layout_node.dom_node())) {
        if (auto image_data = static_cast<HTML::HTMLImageElement const&>(*layout_node.dom_node()).current_request().image_data()) {
            if (is<SVG::SVGDecodedImageData>(*image_data)) {
                auto& svg_data = verify_cast<SVG::SVGDecodedImageData>(*image_data);
                if (svg_data.svg_document().layout_node()) {
                    ++indent;
                    for (size_t i = 0; i < indent; ++i)
                        builder.append("  "sv);
                    builder.append("(SVG-as-image isolated context)\n"sv);

                    dump_tree(builder, *svg_data.svg_document().layout_node(), show_box_model, show_specified_style, interactive);
                    --indent;
                }
            }
        }
    }

    auto dump_fragment = [&](auto& fragment, size_t fragment_index) {
        for (size_t i = 0; i < indent; ++i)
            builder.append("  "sv);
        builder.appendff("  {}frag {}{} from {} ",
            fragment_color_on,
            fragment_index,
            color_off,
            fragment.layout_node().class_name());
        builder.appendff("start: {}, length: {}, rect: {} baseline: {}\n",
            fragment.start(),
            fragment.length(),
            fragment.absolute_rect(),
            fragment.baseline());
        if (is<Layout::TextNode>(fragment.layout_node())) {
            for (size_t i = 0; i < indent; ++i)
                builder.append("  "sv);
            auto const& layout_text = static_cast<Layout::TextNode const&>(fragment.layout_node());
            auto fragment_text = MUST(layout_text.text_for_rendering().substring_from_byte_offset(fragment.start(), fragment.length()));
            builder.appendff("      \"{}\"\n", fragment_text);
        }
    };

    if (is<Layout::BlockContainer>(layout_node) && static_cast<Layout::BlockContainer const&>(layout_node).children_are_inline()) {
        auto& block = static_cast<Layout::BlockContainer const&>(layout_node);
        for (size_t fragment_index = 0; block.paintable_with_lines() && fragment_index < block.paintable_with_lines()->fragments().size(); ++fragment_index) {
            auto const& fragment = block.paintable_with_lines()->fragments()[fragment_index];
            dump_fragment(fragment, fragment_index);
        }
    }

    if (is<Layout::InlineNode>(layout_node) && layout_node.paintable()) {
        auto const& inline_node = static_cast<Layout::InlineNode const&>(layout_node);
        auto const& inline_paintable = static_cast<Painting::InlinePaintable const&>(*inline_node.paintable());
        auto const& fragments = inline_paintable.fragments();
        for (size_t fragment_index = 0; fragment_index < fragments.size(); ++fragment_index) {
            auto const& fragment = fragments[fragment_index];
            dump_fragment(fragment, fragment_index);
        }
    }

    if (show_specified_style && layout_node.dom_node() && layout_node.dom_node()->is_element() && verify_cast<DOM::Element>(layout_node.dom_node())->computed_css_values()) {
        struct NameAndValue {
            FlyString name;
            String value;
        };
        Vector<NameAndValue> properties;
        verify_cast<DOM::Element>(*layout_node.dom_node()).computed_css_values()->for_each_property([&](auto property_id, auto& value) {
            properties.append({ CSS::string_from_property_id(property_id), value.to_string() });
        });
        quick_sort(properties, [](auto& a, auto& b) { return a.name < b.name; });

        for (auto& property : properties) {
            for (size_t i = 0; i < indent; ++i)
                builder.append("    "sv);
            builder.appendff("  ({}: {})\n", property.name, property.value);
        }
    }

    ++indent;
    layout_node.for_each_child([&](auto& child) {
        dump_tree(builder, child, show_box_model, show_specified_style, interactive);
        return IterationDecision::Continue;
    });
    --indent;
}

void dump_selector(CSS::Selector const& selector)
{
    StringBuilder builder;
    dump_selector(builder, selector);
    dbgln("{}", builder.string_view());
}

static void dump_qualified_name(StringBuilder& builder, CSS::Selector::SimpleSelector::QualifiedName const& qualified_name)
{
    StringView namespace_type;
    switch (qualified_name.namespace_type) {
    case CSS::Selector::SimpleSelector::QualifiedName::NamespaceType::Default:
        namespace_type = "Default"sv;
        break;
    case CSS::Selector::SimpleSelector::QualifiedName::NamespaceType::None:
        namespace_type = "None"sv;
        break;
    case CSS::Selector::SimpleSelector::QualifiedName::NamespaceType::Any:
        namespace_type = "Any"sv;
        break;
    case CSS::Selector::SimpleSelector::QualifiedName::NamespaceType::Named:
        namespace_type = "Named"sv;
        break;
    }
    builder.appendff("NamespaceType={}, Namespace='{}', Name='{}'", namespace_type, qualified_name.namespace_, qualified_name.name.name);
}

void dump_selector(StringBuilder& builder, CSS::Selector const& selector)
{
    builder.append("  CSS::Selector:\n"sv);

    for (auto& relative_selector : selector.compound_selectors()) {
        builder.append("    "sv);

        char const* relation_description = "";
        switch (relative_selector.combinator) {
        case CSS::Selector::Combinator::None:
            relation_description = "None";
            break;
        case CSS::Selector::Combinator::ImmediateChild:
            relation_description = "ImmediateChild";
            break;
        case CSS::Selector::Combinator::Descendant:
            relation_description = "Descendant";
            break;
        case CSS::Selector::Combinator::NextSibling:
            relation_description = "AdjacentSibling";
            break;
        case CSS::Selector::Combinator::SubsequentSibling:
            relation_description = "GeneralSibling";
            break;
        case CSS::Selector::Combinator::Column:
            relation_description = "Column";
            break;
        }

        if (*relation_description)
            builder.appendff("{{{}}} ", relation_description);

        for (size_t i = 0; i < relative_selector.simple_selectors.size(); ++i) {
            auto& simple_selector = relative_selector.simple_selectors[i];
            char const* type_description = "Unknown";
            switch (simple_selector.type) {
            case CSS::Selector::SimpleSelector::Type::Universal:
                type_description = "Universal";
                break;
            case CSS::Selector::SimpleSelector::Type::Id:
                type_description = "Id";
                break;
            case CSS::Selector::SimpleSelector::Type::Class:
                type_description = "Class";
                break;
            case CSS::Selector::SimpleSelector::Type::TagName:
                type_description = "TagName";
                break;
            case CSS::Selector::SimpleSelector::Type::Attribute:
                type_description = "Attribute";
                break;
            case CSS::Selector::SimpleSelector::Type::PseudoClass:
                type_description = "PseudoClassSelector";
                break;
            case CSS::Selector::SimpleSelector::Type::PseudoElement:
                type_description = "PseudoElement";
                break;
            }

            builder.appendff("{}:", type_description);

            // FIXME: This is goofy
            if (simple_selector.value.has<CSS::Selector::SimpleSelector::Name>()) {
                builder.append(simple_selector.name());
            } else if (simple_selector.value.has<CSS::Selector::SimpleSelector::QualifiedName>()) {
                dump_qualified_name(builder, simple_selector.qualified_name());
            }

            if (simple_selector.type == CSS::Selector::SimpleSelector::Type::PseudoClass) {
                auto const& pseudo_class = simple_selector.pseudo_class();

                builder.appendff(" pseudo_class={}", CSS::pseudo_class_name(pseudo_class.type));
                auto pseudo_class_metadata = CSS::pseudo_class_metadata(pseudo_class.type);

                switch (pseudo_class_metadata.parameter_type) {
                case CSS::PseudoClassMetadata::ParameterType::None:
                    break;
                case CSS::PseudoClassMetadata::ParameterType::ANPlusB:
                case CSS::PseudoClassMetadata::ParameterType::ANPlusBOf: {
                    builder.appendff("(step={}, offset={}", pseudo_class.nth_child_pattern.step_size, pseudo_class.nth_child_pattern.offset);
                    if (!pseudo_class.argument_selector_list.is_empty()) {
                        builder.append(", selectors=["sv);
                        for (auto const& child_selector : pseudo_class.argument_selector_list)
                            dump_selector(builder, child_selector);
                        builder.append("]"sv);
                    }
                    builder.append(")"sv);
                    break;
                }
                case CSS::PseudoClassMetadata::ParameterType::CompoundSelector:
                case CSS::PseudoClassMetadata::ParameterType::ForgivingSelectorList:
                case CSS::PseudoClassMetadata::ParameterType::SelectorList: {
                    builder.append("(["sv);
                    for (auto& selector : pseudo_class.argument_selector_list)
                        dump_selector(builder, selector);
                    builder.append("])"sv);
                    break;
                }
                case CSS::PseudoClassMetadata::ParameterType::Ident:
                    builder.appendff("(ident={})", string_from_value_id(pseudo_class.identifier.value()));
                    break;
                case CSS::PseudoClassMetadata::ParameterType::LanguageRanges: {
                    builder.append('(');
                    builder.join(',', pseudo_class.languages);
                    builder.append(')');
                    break;
                }
                }
            }

            if (simple_selector.type == CSS::Selector::SimpleSelector::Type::PseudoElement) {
                builder.appendff(" pseudo_element={}", simple_selector.pseudo_element().name());
            }

            if (simple_selector.type == CSS::Selector::SimpleSelector::Type::Attribute) {
                auto const& attribute = simple_selector.attribute();
                char const* attribute_match_type_description = "";

                switch (attribute.match_type) {
                case CSS::Selector::SimpleSelector::Attribute::MatchType::HasAttribute:
                    attribute_match_type_description = "HasAttribute";
                    break;
                case CSS::Selector::SimpleSelector::Attribute::MatchType::ExactValueMatch:
                    attribute_match_type_description = "ExactValueMatch";
                    break;
                case CSS::Selector::SimpleSelector::Attribute::MatchType::ContainsWord:
                    attribute_match_type_description = "ContainsWord";
                    break;
                case CSS::Selector::SimpleSelector::Attribute::MatchType::ContainsString:
                    attribute_match_type_description = "ContainsString";
                    break;
                case CSS::Selector::SimpleSelector::Attribute::MatchType::StartsWithSegment:
                    attribute_match_type_description = "StartsWithSegment";
                    break;
                case CSS::Selector::SimpleSelector::Attribute::MatchType::StartsWithString:
                    attribute_match_type_description = "StartsWithString";
                    break;
                case CSS::Selector::SimpleSelector::Attribute::MatchType::EndsWithString:
                    attribute_match_type_description = "EndsWithString";
                    break;
                }

                builder.appendff(" [{}, ", attribute_match_type_description);
                dump_qualified_name(builder, attribute.qualified_name);
                builder.appendff(", value='{}']", attribute.value);
            }

            if (i != relative_selector.simple_selectors.size() - 1)
                builder.append(", "sv);
        }
        builder.append("\n"sv);
    }
}

ErrorOr<void> dump_rule(CSS::CSSRule const& rule)
{
    StringBuilder builder;
    TRY(dump_rule(builder, rule));
    dbgln("{}", builder.string_view());
    return {};
}

ErrorOr<void> dump_rule(StringBuilder& builder, CSS::CSSRule const& rule, int indent_levels)
{
    indent(builder, indent_levels);
    builder.appendff("{}:\n", rule.class_name());

    switch (rule.type()) {
    case CSS::CSSRule::Type::FontFace:
        dump_font_face_rule(builder, verify_cast<CSS::CSSFontFaceRule const>(rule), indent_levels);
        break;
    case CSS::CSSRule::Type::Import:
        dump_import_rule(builder, verify_cast<CSS::CSSImportRule const>(rule), indent_levels);
        break;
    case CSS::CSSRule::Type::Media:
        TRY(dump_media_rule(builder, verify_cast<CSS::CSSMediaRule const>(rule), indent_levels));
        break;
    case CSS::CSSRule::Type::Style:
        TRY(dump_style_rule(builder, verify_cast<CSS::CSSStyleRule const>(rule), indent_levels));
        break;
    case CSS::CSSRule::Type::Supports:
        TRY(dump_supports_rule(builder, verify_cast<CSS::CSSSupportsRule const>(rule), indent_levels));
        break;
    case CSS::CSSRule::Type::Keyframe:
    case CSS::CSSRule::Type::Keyframes:
        break;
    case CSS::CSSRule::Type::Namespace:
        TRY(dump_namespace_rule(builder, verify_cast<CSS::CSSNamespaceRule const>(rule), indent_levels));
        break;
    }
    return {};
}

void dump_font_face_rule(StringBuilder& builder, CSS::CSSFontFaceRule const& rule, int indent_levels)
{
    auto& font_face = rule.font_face();
    indent(builder, indent_levels + 1);
    builder.appendff("font-family: {}\n", font_face.font_family());

    if (font_face.weight().has_value()) {
        indent(builder, indent_levels + 1);
        builder.appendff("weight: {}\n", font_face.weight().value());
    }

    if (font_face.slope().has_value()) {
        indent(builder, indent_levels + 1);
        builder.appendff("slope: {}\n", font_face.slope().value());
    }

    indent(builder, indent_levels + 1);
    builder.append("sources:\n"sv);
    for (auto const& source : font_face.sources()) {
        indent(builder, indent_levels + 2);
        if (source.local_or_url.has<URL::URL>())
            builder.appendff("url={}, format={}\n", source.local_or_url.get<URL::URL>(), source.format.value_or("???"_string));
        else
            builder.appendff("local={}\n", source.local_or_url.get<AK::String>());
    }

    indent(builder, indent_levels + 1);
    builder.append("unicode-ranges:\n"sv);
    for (auto const& unicode_range : font_face.unicode_ranges()) {
        indent(builder, indent_levels + 2);
        builder.appendff("{}\n", unicode_range.to_string());
    }
}

void dump_import_rule(StringBuilder& builder, CSS::CSSImportRule const& rule, int indent_levels)
{
    indent(builder, indent_levels);
    builder.appendff("  Document URL: {}\n", rule.url());
}

ErrorOr<void> dump_media_rule(StringBuilder& builder, CSS::CSSMediaRule const& media, int indent_levels)
{
    indent(builder, indent_levels);
    builder.appendff("  Media: {}\n  Rules ({}):\n", media.condition_text(), media.css_rules().length());

    for (auto& rule : media.css_rules())
        TRY(dump_rule(builder, rule, indent_levels + 1));
    return {};
}

ErrorOr<void> dump_supports_rule(StringBuilder& builder, CSS::CSSSupportsRule const& supports, int indent_levels)
{
    indent(builder, indent_levels);
    builder.appendff("  Supports: {}\n  Rules ({}):\n", supports.condition_text(), supports.css_rules().length());

    for (auto& rule : supports.css_rules())
        TRY(dump_rule(builder, rule, indent_levels + 1));
    return {};
}

ErrorOr<void> dump_style_rule(StringBuilder& builder, CSS::CSSStyleRule const& rule, int indent_levels)
{
    for (auto& selector : rule.selectors()) {
        dump_selector(builder, selector);
    }
    indent(builder, indent_levels);
    builder.append("  Declarations:\n"sv);
    for (auto& property : rule.declaration().properties()) {
        indent(builder, indent_levels);
        builder.appendff("    {}: '{}'", CSS::string_from_property_id(property.property_id), property.value->to_string());
        if (property.important == CSS::Important::Yes)
            builder.append(" \033[31;1m!important\033[0m"sv);
        builder.append('\n');
    }
    for (auto& property : rule.declaration().custom_properties()) {
        indent(builder, indent_levels);
        builder.appendff("    {}: '{}'", property.key, property.value.value->to_string());
        if (property.value.important == CSS::Important::Yes)
            builder.append(" \033[31;1m!important\033[0m"sv);
        builder.append('\n');
    }
    return {};
}

ErrorOr<void> dump_sheet(CSS::StyleSheet const& sheet)
{
    StringBuilder builder;
    TRY(dump_sheet(builder, sheet));
    dbgln("{}", builder.string_view());
    return {};
}

ErrorOr<void> dump_sheet(StringBuilder& builder, CSS::StyleSheet const& sheet)
{
    auto& css_stylesheet = verify_cast<CSS::CSSStyleSheet>(sheet);

    builder.appendff("CSSStyleSheet{{{}}}: {} rule(s)\n", &sheet, css_stylesheet.rules().length());

    for (auto& rule : css_stylesheet.rules())
        TRY(dump_rule(builder, rule));
    return {};
}

void dump_tree(Painting::Paintable const& paintable)
{
    StringBuilder builder;
    dump_tree(builder, paintable, true);
    dbgln("{}", builder.string_view());
}

void dump_tree(StringBuilder& builder, Painting::Paintable const& paintable, bool colorize, int indent)
{
    for (int i = 0; i < indent; ++i)
        builder.append("  "sv);

    StringView paintable_with_lines_color_on = ""sv;
    StringView paintable_box_color_on = ""sv;
    StringView text_paintable_color_on = ""sv;
    StringView paintable_color_on = ""sv;
    StringView color_off = ""sv;

    if (colorize) {
        paintable_with_lines_color_on = "\033[34m"sv;
        paintable_box_color_on = "\033[33m"sv;
        text_paintable_color_on = "\033[35m"sv;
        paintable_color_on = "\033[32m"sv;
        color_off = "\033[0m"sv;
    }

    if (is<Painting::PaintableWithLines>(paintable))
        builder.append(paintable_with_lines_color_on);
    else if (is<Painting::PaintableBox>(paintable))
        builder.append(paintable_box_color_on);
    else if (is<Painting::TextPaintable>(paintable))
        builder.append(text_paintable_color_on);
    else
        builder.append(paintable_color_on);

    builder.appendff("{}{} ({})", paintable.class_name(), color_off, paintable.layout_node().debug_description());

    if (paintable.layout_node().is_box()) {
        auto const& paintable_box = static_cast<Painting::PaintableBox const&>(paintable);
        builder.appendff(" {}", paintable_box.absolute_border_box_rect());

        if (paintable_box.has_scrollable_overflow()) {
            builder.appendff(" overflow: {}", paintable_box.scrollable_overflow_rect());
        }

        if (!paintable_box.scroll_offset().is_zero()) {
            builder.appendff(" scroll-offset: {}", paintable_box.scroll_offset());
        }
    }
    builder.append("\n"sv);
    for (auto const* child = paintable.first_child(); child; child = child->next_sibling()) {
        dump_tree(builder, *child, colorize, indent + 1);
    }
}

ErrorOr<void> dump_namespace_rule(StringBuilder& builder, CSS::CSSNamespaceRule const& namespace_, int indent_levels)
{
    indent(builder, indent_levels);
    TRY(builder.try_appendff("  Namespace: {}\n", namespace_.namespace_uri()));
    if (!namespace_.prefix().is_empty())
        TRY(builder.try_appendff("  Prefix: {}\n", namespace_.prefix()));

    return {};
}

}