LibJS: Add a constructor to create an Intl.Locale object from a LocaleID

Userland/Libraries/LibJS/Runtime/Intl/Locale.cpp

@@ -4,15 +4,57 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <AK/StringBuilder.h>
 #include <LibJS/Runtime/GlobalObject.h>
 #include <LibJS/Runtime/Intl/Locale.h>
+#include <LibUnicode/Locale.h>
 
 namespace JS::Intl {
 
+Locale* Locale::create(GlobalObject& global_object, Unicode::LocaleID const& locale_id)
+{
+    return global_object.heap().allocate<Locale>(global_object, locale_id, *global_object.intl_locale_prototype());
+}
+
 // 14 Locale Objects, https://tc39.es/ecma402/#locale-objects
 Locale::Locale(Object& prototype)
     : Object(prototype)
 {
 }
 
+Locale::Locale(Unicode::LocaleID const& locale_id, Object& prototype)
+    : Object(prototype)
+{
+    set_locale(locale_id.to_string());
+
+    auto join_keyword_types = [](auto const& types) {
+        StringBuilder builder;
+        builder.join('-', types);
+        return builder.build();
+    };
+
+    for (auto const& extension : locale_id.extensions) {
+        if (!extension.has<Unicode::LocaleExtension>())
+            continue;
+
+        for (auto const& keyword : extension.get<Unicode::LocaleExtension>().keywords) {
+            if (keyword.key == "ca"sv) {
+                set_calendar(join_keyword_types(keyword.types));
+            } else if (keyword.key == "co"sv) {
+                set_collation(join_keyword_types(keyword.types));
+            } else if (keyword.key == "hc"sv) {
+                set_hour_cycle(join_keyword_types(keyword.types));
+            } else if (keyword.key == "kf"sv) {
+                set_case_first(join_keyword_types(keyword.types));
+            } else if (keyword.key == "kn"sv) {
+                set_numeric(keyword.types.is_empty());
+            } else if (keyword.key == "nu"sv) {
+                set_numbering_system(join_keyword_types(keyword.types));
+            }
+        }
+
+        break;
+    }
+}
+
 }

Userland/Libraries/LibJS/Runtime/Intl/Locale.h

@@ -10,6 +10,7 @@
 #include <AK/String.h>
 #include <LibJS/Runtime/Object.h>
 #include <LibJS/Runtime/Value.h>
+#include <LibUnicode/Forward.h>
 
 namespace JS::Intl {
 
@@ -17,7 +18,10 @@ class Locale final : public Object {
     JS_OBJECT(Locale, Object);
 
 public:
+    static Locale* create(GlobalObject&, Unicode::LocaleID const&);
+
     Locale(Object& prototype);
+    Locale(Unicode::LocaleID const&, Object& prototype);
     virtual ~Locale() override = default;
 
     String const& locale() const { return m_locale; }