LibPDF: Replace Value class by AK::Variant

This decreases the memory consumption by LibPDF by 4 bytes per Value,
compensating exactly for the increase in an earlier commit. :^)

Userland/Libraries/LibPDF/ColorSpace.cpp

@@ -60,10 +60,10 @@ RefPtr<CalRGBColorSpace> CalRGBColorSpace::create(RefPtr<Document> document, Vec
         return {};
 
     auto param = parameters[0];
-    if (!param.is_object() || !param.as_object()->is_dict())
+    if (!param.has<NonnullRefPtr<Object>>() || !param.get<NonnullRefPtr<Object>>()->is_dict())
         return {};
 
-    auto dict = object_cast<DictObject>(param.as_object());
+    auto dict = object_cast<DictObject>(param.get<NonnullRefPtr<Object>>());
     if (!dict->contains(CommonNames::WhitePoint))
         return {};
 

Userland/Libraries/LibPDF/Document.cpp

@@ -58,7 +58,7 @@ Document::Document(NonnullRefPtr<Parser> const& parser)
 Value Document::get_or_load_value(u32 index)
 {
     auto value = get_value(index);
-    if (value)
+    if (!value.has<Empty>()) // FIXME: Use Optional instead?
         return value;
 
     auto object = m_parser->parse_object_with_index(index);
@@ -122,7 +122,7 @@ Page Document::get_page(u32 index)
 
     int rotate = 0;
     if (raw_page_object->contains(CommonNames::Rotate)) {
-        rotate = raw_page_object->get_value(CommonNames::Rotate).as_int();
+        rotate = raw_page_object->get_value(CommonNames::Rotate).get<int>();
         VERIFY(rotate % 90 == 0);
     }
 
@@ -133,22 +133,22 @@ Page Document::get_page(u32 index)
 
 Value Document::resolve(Value const& value)
 {
-    if (value.is_ref()) {
+    if (value.has<Reference>()) {
         // FIXME: Surely indirect PDF objects can't contain another indirect PDF object,
         // right? Unsure from the spec, but if they can, these return values would have
         // to be wrapped with another resolve() call.
         return get_or_load_value(value.as_ref_index());
     }
 
-    if (!value.is_object())
+    if (!value.has<NonnullRefPtr<Object>>())
         return value;
 
-    auto obj = value.as_object();
+    auto& obj = value.get<NonnullRefPtr<Object>>();
 
     if (obj->is_indirect_value())
         return static_ptr_cast<IndirectValue>(obj)->value();
 
-    return obj;
+    return value;
 }
 
 bool Document::build_page_tree()
@@ -165,7 +165,7 @@ bool Document::add_page_tree_node_to_page_tree(NonnullRefPtr<DictObject> const&
         return false;
 
     auto kids_array = page_tree->get_array(this, CommonNames::Kids);
-    auto page_count = page_tree->get(CommonNames::Count).value().as_int();
+    auto page_count = page_tree->get(CommonNames::Count).value().get<int>();
 
     if (static_cast<size_t>(page_count) != kids_array->elements().size()) {
         // This page tree contains child page trees, so we recursively add
@@ -213,7 +213,7 @@ void Document::build_outline()
     m_outline->children = move(children);
 
     if (outline_dict->contains(CommonNames::Count))
-        m_outline->count = outline_dict->get_value(CommonNames::Count).as_int();
+        m_outline->count = outline_dict->get_value(CommonNames::Count).get<int>();
 }
 
 NonnullRefPtr<OutlineItem> Document::build_outline_item(NonnullRefPtr<DictObject> const& outline_item_dict)
@@ -232,7 +232,7 @@ NonnullRefPtr<OutlineItem> Document::build_outline_item(NonnullRefPtr<DictObject
     outline_item->title = outline_item_dict->get_string(this, CommonNames::Title)->string();
 
     if (outline_item_dict->contains(CommonNames::Count))
-        outline_item->count = outline_item_dict->get_value(CommonNames::Count).as_int();
+        outline_item->count = outline_item_dict->get_value(CommonNames::Count).get<int>();
 
     if (outline_item_dict->contains(CommonNames::Dest)) {
         auto dest_arr = outline_item_dict->get_array(this, CommonNames::Dest);
@@ -269,14 +269,14 @@ NonnullRefPtr<OutlineItem> Document::build_outline_item(NonnullRefPtr<DictObject
 
     if (outline_item_dict->contains(CommonNames::C)) {
         auto color_array = outline_item_dict->get_array(this, CommonNames::C);
-        auto r = static_cast<int>(255.0f * color_array->at(0).as_float());
-        auto g = static_cast<int>(255.0f * color_array->at(1).as_float());
-        auto b = static_cast<int>(255.0f * color_array->at(2).as_float());
+        auto r = static_cast<int>(255.0f * color_array->at(0).get<float>());
+        auto g = static_cast<int>(255.0f * color_array->at(1).get<float>());
+        auto b = static_cast<int>(255.0f * color_array->at(2).get<float>());
         outline_item->color = Color(r, g, b);
     }
 
     if (outline_item_dict->contains(CommonNames::F)) {
-        auto bitfield = outline_item_dict->get_value(CommonNames::F).as_int();
+        auto bitfield = outline_item_dict->get_value(CommonNames::F).get<int>();
         outline_item->italic = bitfield & 0x1;
         outline_item->bold = bitfield & 0x2;
     }
@@ -286,12 +286,13 @@ NonnullRefPtr<OutlineItem> Document::build_outline_item(NonnullRefPtr<DictObject
 
 NonnullRefPtrVector<OutlineItem> Document::build_outline_item_chain(Value const& first_ref, Value const& last_ref)
 {
-    VERIFY(first_ref.is_ref());
-    VERIFY(last_ref.is_ref());
+    VERIFY(first_ref.has<Reference>());
+    VERIFY(last_ref.has<Reference>());
 
     NonnullRefPtrVector<OutlineItem> children;
 
-    auto first_dict = object_cast<DictObject>(get_or_load_value(first_ref.as_ref_index()).as_object());
+    auto first_dict = object_cast<DictObject>(
+        get_or_load_value(first_ref.as_ref_index()).get<NonnullRefPtr<Object>>());
     auto first = build_outline_item(first_dict);
     children.append(first);
 
@@ -301,7 +302,7 @@ NonnullRefPtrVector<OutlineItem> Document::build_outline_item_chain(Value const&
     while (current_child_dict->contains(CommonNames::Next)) {
         auto next_child_dict_ref = current_child_dict->get_value(CommonNames::Next);
         current_child_index = next_child_dict_ref.as_ref_index();
-        auto next_child_dict = object_cast<DictObject>(get_or_load_value(current_child_index).as_object());
+        auto next_child_dict = object_cast<DictObject>(get_or_load_value(current_child_index).get<NonnullRefPtr<Object>>());
         auto next_child = build_outline_item(next_child_dict);
         children.append(next_child);
 

Userland/Libraries/LibPDF/Document.h

@@ -102,13 +102,13 @@ public:
         auto resolved = resolve(value);
 
         if constexpr (IsSame<T, bool>)
-            return resolved.as_bool();
+            return resolved.get<bool>();
         if constexpr (IsSame<T, int>)
-            return resolved.as_int();
+            return resolved.get<int>();
         if constexpr (IsSame<T, float>)
-            return resolved.as_float();
+            return resolved.get<float>();
         if constexpr (IsObject<T>)
-            return object_cast<T>(resolved.as_object());
+            return object_cast<T>(resolved.get<NonnullRefPtr<Object>>());
 
         VERIFY_NOT_REACHED();
     }

Userland/Libraries/LibPDF/Parser.cpp

@@ -125,10 +125,10 @@ Parser::LinearizationResult Parser::initialize_linearization_dict()
 {
     // parse_header() is called immediately before this, so we are at the right location
     auto dict_value = m_document->resolve(parse_indirect_value());
-    if (!dict_value || !dict_value.is_object())
+    if (!dict_value.has<NonnullRefPtr<Object>>())
         return LinearizationResult::Error;
 
-    auto dict_object = dict_value.as_object();
+    auto dict_object = dict_value.get<NonnullRefPtr<Object>>();
     if (!dict_object->is_dict())
         return LinearizationResult::NotLinearized;
 
@@ -149,16 +149,16 @@ Parser::LinearizationResult Parser::initialize_linearization_dict()
     auto first_page = dict->get(CommonNames::P).value_or({});
 
     // Validation
-    if (!length_of_file.is_int_type<u32>()
-        || !hint_table.is_object()
-        || !first_page_object_number.is_int_type<u32>()
-        || !number_of_pages.is_int_type<u16>()
-        || !offset_of_main_xref_table.is_int_type<u32>()
-        || (first_page && !first_page.is_int_type<u32>())) {
+    if (!length_of_file.has_u32()
+        || !hint_table.has<NonnullRefPtr<Object>>()
+        || !first_page_object_number.has_u32()
+        || !number_of_pages.has_u16()
+        || !offset_of_main_xref_table.has_u32()
+        || (!first_page.has<Empty>() && !first_page.has_u32())) {
         return LinearizationResult::Error;
     }
 
-    auto hint_table_object = hint_table.as_object();
+    auto hint_table_object = hint_table.get<NonnullRefPtr<Object>>();
     if (!hint_table_object->is_array())
         return LinearizationResult::Error;
 
@@ -177,24 +177,24 @@ Parser::LinearizationResult Parser::initialize_linearization_dict()
         overflow_hint_stream_length = hint_table_array->at(3);
     }
 
-    if (!primary_hint_stream_offset.is_int_type<u32>()
-        || !primary_hint_stream_length.is_int_type<u32>()
-        || (overflow_hint_stream_offset && !overflow_hint_stream_offset.is_int_type<u32>())
-        || (overflow_hint_stream_length && !overflow_hint_stream_length.is_int_type<u32>())) {
+    if (!primary_hint_stream_offset.has_u32()
+        || !primary_hint_stream_length.has_u32()
+        || (!overflow_hint_stream_offset.has<Empty>() && !overflow_hint_stream_offset.has_u32())
+        || (!overflow_hint_stream_length.has<Empty>() && !overflow_hint_stream_length.has_u32())) {
         return LinearizationResult::Error;
     }
 
     m_linearization_dictionary = LinearizationDictionary {
-        length_of_file.as_int_type<u32>(),
-        primary_hint_stream_offset.as_int_type<u32>(),
-        primary_hint_stream_length.as_int_type<u32>(),
-        overflow_hint_stream_offset ? overflow_hint_stream_offset.as_int_type<u32>() : NumericLimits<u32>::max(),
-        overflow_hint_stream_length ? overflow_hint_stream_length.as_int_type<u32>() : NumericLimits<u32>::max(),
-        first_page_object_number.as_int_type<u32>(),
-        offset_of_first_page_end.as_int_type<u32>(),
-        number_of_pages.as_int_type<u16>(),
-        offset_of_main_xref_table.as_int_type<u32>(),
-        first_page ? first_page.as_int_type<u32>() : NumericLimits<u32>::max(),
+        length_of_file.get_u32(),
+        primary_hint_stream_offset.get_u32(),
+        primary_hint_stream_length.get_u32(),
+        overflow_hint_stream_offset.has<Empty>() ? NumericLimits<u32>::max() : overflow_hint_stream_offset.get_u32(),
+        overflow_hint_stream_length.has<Empty>() ? NumericLimits<u32>::max() : overflow_hint_stream_length.get_u32(),
+        first_page_object_number.get_u32(),
+        offset_of_first_page_end.get_u32(),
+        number_of_pages.get_u16(),
+        offset_of_main_xref_table.get_u32(),
+        first_page.has<Empty>() ? NumericLimits<u32>::max() : first_page.get_u32(),
     };
 
     return LinearizationResult::Linearized;
@@ -241,10 +241,10 @@ bool Parser::initialize_hint_tables()
             return {};
 
         auto stream_value = stream_indirect_value->value();
-        if (!stream_value.is_object())
+        if (!stream_value.has<NonnullRefPtr<Object>>())
             return {};
 
-        auto stream_object = stream_value.as_object();
+        auto stream_object = stream_value.get<NonnullRefPtr<Object>>();
         if (!stream_object->is_stream())
             return {};
 
@@ -310,9 +310,9 @@ bool Parser::initialize_non_linearized_xref_table()
 
     m_reader.set_reading_forwards();
     auto xref_offset_value = parse_number();
-    if (!xref_offset_value.is_int())
+    if (!xref_offset_value.has<int>())
         return false;
-    auto xref_offset = xref_offset_value.as_int();
+    auto xref_offset = xref_offset_value.get<int>();
 
     m_reader.move_to(xref_offset);
     m_xref_table = parse_xref_table();
@@ -339,9 +339,9 @@ RefPtr<XRefTable> Parser::parse_xref_table()
         Vector<XRefEntry> entries;
 
         auto starting_index_value = parse_number();
-        auto starting_index = starting_index_value.as_int();
+        auto starting_index = starting_index_value.get<int>();
         auto object_count_value = parse_number();
-        auto object_count = object_count_value.as_int();
+        auto object_count = object_count_value.get<int>();
 
         for (int i = 0; i < object_count; i++) {
             auto offset_string = String(m_reader.bytes().slice(m_reader.offset(), 10));
@@ -603,7 +603,7 @@ Value Parser::parse_value()
     if (m_reader.matches("null")) {
         m_reader.move_by(4);
         consume_whitespace();
-        return Value(Value::NullTag {});
+        return Value(nullptr);
     }
 
     if (m_reader.matches("true")) {
@@ -646,12 +646,12 @@ Value Parser::parse_value()
 Value Parser::parse_possible_indirect_value_or_ref()
 {
     auto first_number = parse_number();
-    if (!first_number.is_int() || !matches_number())
+    if (!first_number.has<int>() || !matches_number())
         return first_number;
 
     m_reader.save();
     auto second_number = parse_number();
-    if (!second_number.is_int()) {
+    if (!second_number.has<int>()) {
         m_reader.load();
         return first_number;
     }
@@ -660,12 +660,12 @@ Value Parser::parse_possible_indirect_value_or_ref()
         m_reader.discard();
         consume();
         consume_whitespace();
-        return Value(Reference(first_number.as_int(), second_number.as_int()));
+        return Value(Reference(first_number.get<int>(), second_number.get<int>()));
     }
 
     if (m_reader.matches("obj")) {
         m_reader.discard();
-        return parse_indirect_value(first_number.as_int(), second_number.as_int());
+        return parse_indirect_value(first_number.get<int>(), second_number.get<int>());
     }
 
     m_reader.load();
@@ -692,12 +692,12 @@ RefPtr<IndirectValue> Parser::parse_indirect_value(int index, int generation)
 RefPtr<IndirectValue> Parser::parse_indirect_value()
 {
     auto first_number = parse_number();
-    if (!first_number.is_int())
+    if (!first_number.has<int>())
         return {};
     auto second_number = parse_number();
-    if (!second_number.is_int())
+    if (!second_number.has<int>())
         return {};
-    return parse_indirect_value(first_number.as_int(), second_number.as_int());
+    return parse_indirect_value(first_number.get<int>(), second_number.get<int>());
 }
 
 Value Parser::parse_number()
@@ -928,7 +928,7 @@ RefPtr<ArrayObject> Parser::parse_array()
 
     while (!m_reader.matches(']')) {
         auto value = parse_value();
-        if (!value)
+        if (value.has<Empty>())
             return {};
         values.append(value);
     }
@@ -954,7 +954,7 @@ RefPtr<DictObject> Parser::parse_dict()
         if (!name)
             return {};
         auto value = parse_value();
-        if (!value)
+        if (value.has<Empty>())
             return {};
         map.set(name->name(), value);
     }
@@ -1004,14 +1004,14 @@ RefPtr<DictObject> Parser::conditionally_parse_page_tree_node(u32 object_index,
             return {};
         }
         auto value = parse_value();
-        if (!value) {
+        if (value.has<Empty>()) {
             ok = false;
             return {};
         }
         if (name_string == CommonNames::Type) {
-            if (!value.is_object())
+            if (!value.has<NonnullRefPtr<Object>>())
                 return {};
-            auto type_object = value.as_object();
+            auto type_object = value.get<NonnullRefPtr<Object>>();
             if (!type_object->is_name())
                 return {};
             auto type_name = object_cast<NameObject>(type_object);
@@ -1039,7 +1039,7 @@ RefPtr<StreamObject> Parser::parse_stream(NonnullRefPtr<DictObject> dict)
     ReadonlyBytes bytes;
 
     auto maybe_length = dict->get(CommonNames::Length);
-    if (maybe_length.has_value() && (!maybe_length->is_ref() || m_xref_table)) {
+    if (maybe_length.has_value() && (!maybe_length->has<Reference>() || m_xref_table)) {
         // The PDF writer has kindly provided us with the direct length of the stream
         m_reader.save();
         auto length = m_document->resolve_to<int>(maybe_length.value());

Userland/Libraries/LibPDF/Renderer.cpp

@@ -132,12 +132,12 @@ RENDERER_HANDLER(set_line_width)
 
 RENDERER_HANDLER(set_line_cap)
 {
-    state().line_cap_style = static_cast<LineCapStyle>(args[0].as_int());
+    state().line_cap_style = static_cast<LineCapStyle>(args[0].get<int>());
 }
 
 RENDERER_HANDLER(set_line_join)
 {
-    state().line_join_style = static_cast<LineJoinStyle>(args[0].as_int());
+    state().line_join_style = static_cast<LineJoinStyle>(args[0].get<int>());
 }
 
 RENDERER_HANDLER(set_miter_limit)
@@ -150,8 +150,8 @@ RENDERER_HANDLER(set_dash_pattern)
     auto dash_array = m_document->resolve_to<ArrayObject>(args[0]);
     Vector<int> pattern;
     for (auto& element : *dash_array)
-        pattern.append(element.as_int());
-    state().line_dash_pattern = LineDashPattern { pattern, args[1].as_int() };
+        pattern.append(element.get<int>());
+    state().line_dash_pattern = LineDashPattern { pattern, args[1].get<int>() };
 }
 
 RENDERER_TODO(set_color_rendering_intent);
@@ -335,7 +335,7 @@ RENDERER_HANDLER(text_set_font)
 
 RENDERER_HANDLER(text_set_rendering_mode)
 {
-    text_state().rendering_mode = static_cast<TextRenderingMode>(args[0].as_int());
+    text_state().rendering_mode = static_cast<TextRenderingMode>(args[0].get<int>());
 }
 
 RENDERER_HANDLER(text_set_rise)
@@ -398,11 +398,12 @@ RENDERER_HANDLER(text_show_string_array)
     float next_shift = 0.0f;
 
     for (auto& element : elements) {
-        if (element.is_number()) {
-            next_shift = element.to_float();
+        if (element.has<int>()) {
+            next_shift = element.get<int>();
+        } else if (element.has<float>()) {
+            next_shift = element.get<float>();
         } else {
-            VERIFY(element.is_object());
-            auto obj = element.as_object();
+            auto& obj = element.get<NonnullRefPtr<Object>>();
             VERIFY(obj->is_string());
             auto str = object_cast<StringObject>(obj)->string();
             show_text(str, next_shift);
@@ -568,7 +569,7 @@ void Renderer::show_text(String const& string, float shift)
 
 RefPtr<ColorSpace> Renderer::get_color_space(Value const& value)
 {
-    auto name = object_cast<NameObject>(value.as_object())->name();
+    auto name = object_cast<NameObject>(value.get<NonnullRefPtr<Object>>())->name();
 
     // Simple color spaces with no parameters, which can be specified directly
     if (name == CommonNames::DeviceGray)

Userland/Libraries/LibPDF/Value.cpp

@@ -9,52 +9,31 @@
 
 namespace PDF {
 
-Value& Value::operator=(Value const& other)
-{
-    m_type = other.m_type;
-    switch (m_type) {
-    case Type::Empty:
-    case Type::Null:
-        break;
-    case Type::Bool:
-        m_as_bool = other.m_as_bool;
-        break;
-    case Type::Int:
-        m_as_int = other.m_as_int;
-        break;
-    case Type::Float:
-        m_as_float = other.m_as_float;
-        break;
-    case Type::Ref:
-        m_as_ref = other.m_as_ref;
-        break;
-    case Type::Object:
-        m_as_object = other.m_as_object;
-        break;
-    }
-    return *this;
-}
-
 String Value::to_string(int indent) const
 {
-    switch (m_type) {
-    case Type::Empty:
-        return "<empty>";
-    case Type::Null:
-        return "null";
-    case Type::Bool:
-        return as_bool() ? "true" : "false";
-    case Type::Int:
-        return String::number(as_int());
-    case Type::Float:
-        return String::number(as_float());
-    case Type::Ref:
-        return String::formatted("{} {} R", as_ref_index(), as_ref_generation_index());
-    case Type::Object:
-        return as_object()->to_string(indent);
-    }
-
-    VERIFY_NOT_REACHED();
+    return visit(
+        [&](Empty const&) -> String {
+            // Return type deduction means that we can't use implicit conversions.
+            return "<empty>";
+        },
+        [&](std::nullptr_t const&) -> String {
+            return "null";
+        },
+        [&](bool const& b) -> String {
+            return b ? "true" : "false";
+        },
+        [&](int const& i) {
+            return String::number(i);
+        },
+        [&](float const& f) {
+            return String::number(f);
+        },
+        [&](Reference const& ref) {
+            return String::formatted("{} {} R", ref.as_ref_index(), ref.as_ref_generation_index());
+        },
+        [&](NonnullRefPtr<Object> const& object) {
+            return object->to_string(indent);
+        });
 }
 
 }

Userland/Libraries/LibPDF/Value.h

@@ -9,171 +9,79 @@
 #include <AK/Format.h>
 #include <AK/RefPtr.h>
 #include <AK/String.h>
+#include <AK/Variant.h>
 #include <LibPDF/Forward.h>
 #include <LibPDF/Object.h>
 #include <LibPDF/Reference.h>
 
 namespace PDF {
 
-class Value {
+class Value : public Variant<Empty, std::nullptr_t, bool, int, float, Reference, NonnullRefPtr<Object>> {
 public:
+    using Variant::Variant;
+
     Value()
-        : m_type(Type::Empty)
+        : Variant(Empty())
     {
     }
 
-    struct NullTag {
-    };
-
-    Value(NullTag)
-        : m_type(Type::Null)
-    {
-    }
-
-    Value(bool b)
-        : m_type(Type::Bool)
-    {
-        m_as_bool = b;
-    }
-
-    Value(int i)
-        : m_type(Type::Int)
-    {
-        m_as_int = i;
-    }
-
-    Value(float f)
-        : m_type(Type::Float)
-    {
-        m_as_float = f;
-    }
-
-    Value(Reference ref)
-        : m_type(Type::Ref)
-    {
-        m_as_ref = ref;
-    }
-
     template<IsObject T>
-    Value(RefPtr<T> obj)
-        : m_type(obj ? Type::Object : Type::Empty)
+    Value(RefPtr<T> const& refptr)
+        : Variant(nullptr)
     {
-        if (obj) {
-            m_as_object = obj;
-        }
+        if (refptr)
+            set<NonnullRefPtr<Object>>(*refptr);
     }
 
-    template<IsObject T>
-    Value(NonnullRefPtr<T> obj)
-        : m_type(Type::Object)
+    [[nodiscard]] String to_string(int indent = 0) const;
+
+    [[nodiscard]] ALWAYS_INLINE bool has_number() const { return has<int>() || has<float>(); }
+
+    [[nodiscard]] ALWAYS_INLINE bool has_u32() const
     {
-        m_as_object = obj;
+        return has<int>() && get<int>() >= 0;
     }
 
-    Value(Value const& other)
+    [[nodiscard]] ALWAYS_INLINE bool has_u16() const
     {
-        *this = other;
+        return has<int>() && get<int>() >= 0 && get<int>() < 65536;
     }
 
-    ~Value() = default;
-
-    Value& operator=(Value const& other);
-
-    [[nodiscard]] ALWAYS_INLINE bool is_empty() const { return m_type == Type::Empty; }
-    [[nodiscard]] ALWAYS_INLINE bool is_null() const { return m_type == Type::Null; }
-    [[nodiscard]] ALWAYS_INLINE bool is_bool() const { return m_type == Type::Bool; }
-    [[nodiscard]] ALWAYS_INLINE bool is_int() const { return m_type == Type::Int; }
-    [[nodiscard]] ALWAYS_INLINE bool is_float() const { return m_type == Type::Float; }
-    [[nodiscard]] ALWAYS_INLINE bool is_number() const { return is_int() || is_float(); }
-    [[nodiscard]] ALWAYS_INLINE bool is_ref() const { return m_type == Type::Ref; }
-    [[nodiscard]] ALWAYS_INLINE bool is_object() const { return m_type == Type::Object; }
-
-    [[nodiscard]] ALWAYS_INLINE bool as_bool() const
+    [[nodiscard]] ALWAYS_INLINE u32 get_u32() const
     {
-        VERIFY(is_bool());
-        return m_as_bool;
+        VERIFY(has_u32());
+        return get<int>();
     }
 
-    [[nodiscard]] ALWAYS_INLINE int as_int() const
+    [[nodiscard]] ALWAYS_INLINE u16 get_u16() const
     {
-        VERIFY(is_int());
-        return m_as_int;
-    }
-
-    template<typename T>
-    [[nodiscard]] ALWAYS_INLINE bool is_int_type() const
-    {
-        if (!is_int())
-            return false;
-        auto as_int = static_cast<T>(m_as_int);
-        return as_int >= NumericLimits<T>::min() && as_int <= NumericLimits<T>::max();
-    }
-
-    template<typename T>
-    [[nodiscard]] ALWAYS_INLINE T as_int_type() const
-    {
-        VERIFY(is_int_type<T>());
-        return static_cast<T>(m_as_int);
+        VERIFY(has_u16());
+        return get<int>();
     }
 
     [[nodiscard]] ALWAYS_INLINE int to_int() const
     {
-        if (is_int())
-            return as_int();
-        return static_cast<int>(as_float());
-    }
-
-    [[nodiscard]] ALWAYS_INLINE float as_float() const
-    {
-        VERIFY(is_float());
-        return m_as_float;
+        if (has<int>())
+            return get<int>();
+        return static_cast<int>(get<float>());
     }
 
     [[nodiscard]] ALWAYS_INLINE float to_float() const
     {
-        if (is_float())
-            return as_float();
-        return static_cast<float>(as_int());
+        if (has<float>())
+            return get<float>();
+        return static_cast<float>(get<int>());
     }
 
     [[nodiscard]] ALWAYS_INLINE u32 as_ref_index() const
     {
-        VERIFY(is_ref());
-        return m_as_ref.as_ref_index();
+        return get<Reference>().as_ref_index();
     }
 
     [[nodiscard]] ALWAYS_INLINE u32 as_ref_generation_index() const
     {
-        VERIFY(is_ref());
-        return m_as_ref.as_ref_generation_index();
+        return get<Reference>().as_ref_generation_index();
     }
-
-    [[nodiscard]] ALWAYS_INLINE NonnullRefPtr<Object> as_object() const { return *m_as_object; }
-
-    [[nodiscard]] ALWAYS_INLINE explicit operator bool() const { return !is_empty(); }
-
-    [[nodiscard]] String to_string(int indent = 0) const;
-
-private:
-    enum class Type {
-        Empty,
-        Null,
-        Bool,
-        Int,
-        Float,
-        Ref,
-        Object,
-    };
-
-    union {
-        bool m_as_bool;
-        int m_as_int;
-        Reference m_as_ref;
-        float m_as_float;
-    };
-
-    RefPtr<Object> m_as_object;
-    Type m_type;
 };
 
 }