1 files changed, 54 insertions, 0 deletions
diff --git a/src/corelib/text/qlocale_wasm.cpp b/src/corelib/text/qlocale_wasm.cpp
new file mode 100644
index 0000000000..6b011af4a7
--- /dev/null
+++ b/src/corelib/text/qlocale_wasm.cpp
@@ -0,0 +1,54 @@
+// Copyright (C) 2023 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#include "qlocale_p.h"
+
+#include <emscripten/val.h>
+
+#include <string>
+#include <vector>
+
+QT_BEGIN_NAMESPACE
+
+#ifndef QT_NO_SYSTEMLOCALE
+
+namespace {
+
+QStringList navigatorLanguages()
+{
+    using emscripten::val;
+    const val navigator = val::global("navigator");
+    const auto languages = emscripten::vecFromJSArray<std::string>(navigator["languages"]);
+    QStringList qtLanguages;
+    for (const std::string& language : languages)
+        qtLanguages.append(QString::fromStdString(language));
+    return qtLanguages;
+}
+
+}
+
+QVariant QSystemLocale::query(QueryType query, QVariant &&in) const
+{
+    Q_UNUSED(in);
+
+    switch (query) {
+    case QSystemLocale::UILanguages:
+        return QVariant(navigatorLanguages());
+    default:
+    break;
+    }
+
+    return QVariant();
+}
+
+QLocale QSystemLocale::fallbackLocale() const
+{
+    const QStringList languages = navigatorLanguages();
+    if (languages.isEmpty())
+        return QLocale(u"en-US");
+    return QLocale(languages[0]);
+}
+
+#endif // QT_NO_SYSTEMLOCALE
+
+QT_END_NAMESPACE