LibWeb: Add helper functions for handling ARIA state and properties

These will make serializing and calculating default values easier.

Userland/Libraries/LibWeb/ARIA/StateAndProperties.h

@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2023, Jonah Shafran <jonahshafran@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/String.h>
+#include <LibWeb/ARIA/ARIAMixin.h>
+#include <LibWeb/ARIA/RoleType.h>
+
+namespace Web::ARIA {
+
+enum class StateAndProperties {
+    AriaActiveDescendant,
+    AriaAtomic,
+    AriaAutoComplete,
+    AriaBusy,
+    AriaChecked,
+    AriaColCount,
+    AriaColIndex,
+    AriaColSpan,
+    AriaControls,
+    AriaCurrent,
+    AriaDescribedBy,
+    AriaDetails,
+    AriaDisabled,
+    AriaDropEffect,
+    AriaErrorMessage,
+    AriaExpanded,
+    AriaFlowTo,
+    AriaGrabbed,
+    AriaHasPopup,
+    AriaHidden,
+    AriaInvalid,
+    AriaKeyShortcuts,
+    AriaLabel,
+    AriaLabelledBy,
+    AriaLevel,
+    AriaLive,
+    AriaModal,
+    AriaMultiLine,
+    AriaMultiSelectable,
+    AriaOrientation,
+    AriaOwns,
+    AriaPlaceholder,
+    AriaPosInSet,
+    AriaPressed,
+    AriaReadOnly,
+    AriaRelevant,
+    AriaRequired,
+    AriaRoleDescription,
+    AriaRowCount,
+    AriaRowIndex,
+    AriaRowSpan,
+    AriaSelected,
+    AriaSetSize,
+    AriaSort,
+    AriaValueMax,
+    AriaValueMin,
+    AriaValueNow,
+    AriaValueText
+};
+
+using DefaultValueType = Variant<Empty, f64, AriaOrientation, AriaLive, bool, AriaHasPopup>;
+ErrorOr<String> state_or_property_to_string_value(StateAndProperties, AriaData const&, DefaultValueType = {});
+ErrorOr<String> tristate_to_string(Tristate);
+ErrorOr<String> optional_integer_to_string(Optional<i32>);
+ErrorOr<String> optional_bool_to_string(Optional<bool>);
+ErrorOr<String> optional_number_to_string(Optional<f64>);
+ErrorOr<String> id_reference_list_to_string(Vector<DeprecatedString> const&);
+StringView state_or_property_to_string(StateAndProperties);
+
+}