LibWeb: Rename NumericStyleValue -> NumberStyleValue

This is in preparation of splitting off a separate IntegerStyleValue.

Userland/Libraries/LibWeb/CSS/StyleValues/NumberStyleValue.h

@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
+ * Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.org>
+ * Copyright (c) 2022-2023, MacDue <macdue@dueutil.tech>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibWeb/CSS/StyleValue.h>
+
+namespace Web::CSS {
+
+class NumberStyleValue : public StyleValueWithDefaultOperators<NumberStyleValue> {
+public:
+    static ErrorOr<ValueComparingNonnullRefPtr<NumberStyleValue>> create_float(float value)
+    {
+        return adopt_nonnull_ref_or_enomem(new (nothrow) NumberStyleValue(value));
+    }
+
+    static ErrorOr<ValueComparingNonnullRefPtr<NumberStyleValue>> create_integer(i64 value)
+    {
+        return adopt_nonnull_ref_or_enomem(new (nothrow) NumberStyleValue(value));
+    }
+
+    float number() const
+    {
+        return m_value.visit(
+            [](float value) { return value; },
+            [](i64 value) { return (float)value; });
+    }
+
+    bool has_integer() const { return m_value.has<i64>(); }
+    float integer() const { return m_value.get<i64>(); }
+
+    virtual ErrorOr<String> to_string() const override;
+
+    bool properties_equal(NumberStyleValue const& other) const { return m_value == other.m_value; }
+
+private:
+    explicit NumberStyleValue(Variant<float, i64> value)
+        : StyleValueWithDefaultOperators(Type::Number)
+        , m_value(move(value))
+    {
+    }
+
+    Variant<float, i64> m_value { (i64)0 };
+};
+
+}