LibWeb: Add SVGNumber

Author: https://github.com/gmta
Commit: 7e869c7816
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/6709

Libraries/LibWeb/SVG/SVGNumber.cpp

@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2025, Jelle Raaijmakers <jelle@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibWeb/Bindings/Intrinsics.h>
+#include <LibWeb/Bindings/SVGNumberPrototype.h>
+#include <LibWeb/SVG/SVGNumber.h>
+
+namespace Web::SVG {
+
+GC_DEFINE_ALLOCATOR(SVGNumber);
+
+GC::Ref<SVGNumber> SVGNumber::create(JS::Realm& realm, float value, ReadOnly read_only)
+{
+    return realm.create<SVGNumber>(realm, value, read_only);
+}
+
+SVGNumber::SVGNumber(JS::Realm& realm, float value, ReadOnly read_only)
+    : PlatformObject(realm)
+    , m_value(value)
+    , m_read_only(read_only)
+{
+}
+
+void SVGNumber::initialize(JS::Realm& realm)
+{
+    WEB_SET_PROTOTYPE_FOR_INTERFACE(SVGNumber);
+    Base::initialize(realm);
+}
+
+// https://www.w3.org/TR/SVG2/types.html#__svg__SVGNumber__value
+WebIDL::ExceptionOr<void> SVGNumber::set_value(float value)
+{
+    // 1. If the SVGNumber is read only, then throw a NoModificationAllowedError.
+    if (m_read_only == ReadOnly::Yes)
+        return WebIDL::NoModificationAllowedError::create(realm(), "Cannot modify value of read-only SVGNumber"_utf16);
+
+    // 2. Set the SVGNumber's value to the value being assigned to the value member.
+    m_value = value;
+
+    // FIXME: 3. If the SVGNumber reflects an element of the base value of a reflected attribute, then reserialize the
+    //    reflected attribute.
+
+    return {};
+}
+
+}

Libraries/LibWeb/SVG/SVGNumber.h

@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2025, Jelle Raaijmakers <jelle@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibWeb/Bindings/PlatformObject.h>
+#include <LibWeb/WebIDL/ExceptionOr.h>
+
+namespace Web::SVG {
+
+// https://www.w3.org/TR/SVG2/types.html#InterfaceSVGNumber
+class SVGNumber final : public Bindings::PlatformObject {
+    WEB_PLATFORM_OBJECT(SVGNumber, Bindings::PlatformObject);
+    GC_DECLARE_ALLOCATOR(SVGNumber);
+
+public:
+    enum class ReadOnly : u8 {
+        Yes,
+        No,
+    };
+
+    [[nodiscard]] static GC::Ref<SVGNumber> create(JS::Realm&, float value, ReadOnly);
+    virtual ~SVGNumber() override = default;
+
+    float value() const { return m_value; }
+    WebIDL::ExceptionOr<void> set_value(float value);
+
+    ReadOnly read_only() const { return m_read_only; }
+
+private:
+    SVGNumber(JS::Realm&, float value, ReadOnly);
+
+    virtual void initialize(JS::Realm&) override;
+
+    float m_value { 0 };
+
+    // https://www.w3.org/TR/SVG2/types.html#ReadOnlyNumber
+    ReadOnly m_read_only;
+};
+
+}

Libraries/LibWeb/SVG/SVGNumber.idl

@@ -0,0 +1,5 @@
+// https://www.w3.org/TR/SVG2/types.html#InterfaceSVGNumber
+[Exposed=Window]
+interface SVGNumber {
+    attribute float value;
+};