LibWeb: Remove use of UnicodeData header from DOM::Element

The UnicodeData header cannot be included by any file other than .cpp
files within LibUnicode itself. Outside users cannot assume the header
will exist, as it will not be generated if the CMake option to do so is
disabled (ENABLE_UNICODE_DATABASE_DOWNLOAD).

Userland/Libraries/LibWeb/DOM/Element.cpp

@@ -9,7 +9,6 @@
 #include <AK/Debug.h>
 #include <AK/StringBuilder.h>
 #include <LibUnicode/CharacterTypes.h>
-#include <LibUnicode/UnicodeData.h>
 #include <LibWeb/Bindings/ElementPrototype.h>
 #include <LibWeb/Bindings/ExceptionOrUtils.h>
 #include <LibWeb/Bindings/MainThreadVM.h>
@@ -1966,6 +1965,14 @@ Element::Directionality Element::directionality() const
     // The directionality of an element (any element, not just an HTML element) is either 'ltr' or 'rtl',
     // and is determined as per the first appropriate set of steps from the following list:
 
+    static auto bidirectional_class_L = Unicode::bidirectional_class_from_string("L"sv);
+    static auto bidirectional_class_AL = Unicode::bidirectional_class_from_string("AL"sv);
+    static auto bidirectional_class_R = Unicode::bidirectional_class_from_string("R"sv);
+
+    // AD-HOC: Assume 'ltr' if Unicode data generation is disabled.
+    if (!bidirectional_class_L.has_value())
+        return Directionality::Ltr;
+
     auto dir = this->dir();
 
     // -> If the element's dir attribute is in the ltr state
@@ -2008,11 +2015,12 @@ Element::Directionality Element::directionality() const
         // value, then the directionality of the element is 'rtl'. [BIDI]
         for (auto code_point : Utf8View(value)) {
             auto bidi_class = Unicode::bidirectional_class(code_point);
-            if (bidi_class == Unicode::BidirectionalClass::L)
+            if (bidi_class == bidirectional_class_L)
                 break;
-            if (bidi_class == Unicode::BidirectionalClass::AL || bidi_class == Unicode::BidirectionalClass::R)
+            if (bidi_class == bidirectional_class_AL || bidi_class == bidirectional_class_R)
                 return Directionality::Rtl;
         }
+
         // Otherwise, if the element's value is not the empty string, or if the element is a document element,
         // the directionality of the element is 'ltr'.
         if (!value.is_empty() || is_document_element()) {
@@ -2055,7 +2063,7 @@ Element::Directionality Element::directionality() const
             // Look for matching characters
             for (auto code_point : Utf8View(text_node.data())) {
                 auto bidi_class = Unicode::bidirectional_class(code_point);
-                if (first_is_one_of(bidi_class, Unicode::BidirectionalClass::L, Unicode::BidirectionalClass::AL, Unicode::BidirectionalClass::R)) {
+                if (first_is_one_of(bidi_class, bidirectional_class_L, bidirectional_class_AL, bidirectional_class_R)) {
                     found_character = code_point;
                     found_character_bidi_class = bidi_class;
                     return IterationDecision::Break;
@@ -2068,12 +2076,12 @@ Element::Directionality Element::directionality() const
         // If such a character is found and it is of bidirectional character type AL or R,
         // the directionality of the element is 'rtl'.
         if (found_character.has_value()
-            && first_is_one_of(found_character_bidi_class.value(), Unicode::BidirectionalClass::AL, Unicode::BidirectionalClass::R)) {
+            && first_is_one_of(found_character_bidi_class.value(), bidirectional_class_AL, bidirectional_class_R)) {
             return Directionality::Rtl;
         }
         // If such a character is found and it is of bidirectional character type L,
         // the directionality of the element is 'ltr'.
-        if (found_character.has_value() && found_character_bidi_class.value() == Unicode::BidirectionalClass::L) {
+        if (found_character.has_value() && found_character_bidi_class.value() == bidirectional_class_L) {
             return Directionality::Ltr;
         }
         // Otherwise, if the element is a document element, the directionality of the element is 'ltr'.