Import upstream v0.16.22, stripped

Upstream commit: 474dd0229cb20cf513036619781ed97bd8073c3f Enterprise-only files removed or emptied: 63 Enterprise-only snippets removed: 117 in 50 files Dangling module declarations removed: 5 Cargo edits turning enterprise off: 14 Verification: clean Enterprise feature gates left for rebuilt features: 19 in 18 files Produced by tools/fork/strip.py. The full report is in docs/fork/strip-reports/ on main.
2026-09-18 10:21:56 -07:00
commit 7dae9b29fd
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+/*
+ * SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <[email protected]>
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
+ */
+
+include!(concat!(env!("OUT_DIR"), "/locales.rs"));
+
+const TRADITIONAL_CHINESE: [&str; 4] = ["hant", "tw", "hk", "mo"];
+
+pub fn locale_or_default(name: &str) -> &'static Locale {
+    if let Some(locale) = locale(name) {
+        return locale;
+    }
+
+    let mut subtags = name.split(['_', '-']);
+    let language = subtags.next().unwrap_or(name);
+
+    if language.eq_ignore_ascii_case("zh")
+        && subtags.any(|subtag| {
+            TRADITIONAL_CHINESE
+                .iter()
+                .any(|variant| subtag.eq_ignore_ascii_case(variant))
+        })
+    {
+        return &ZH_TW_LOCALES;
+    }
+
+    locale_by_language(language).unwrap_or(&EN_US_LOCALES)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::{ALL_LOCALES, locale, locale_or_default};
+
+    const LOCALES: [&str; 37] = [
+        "en-US", "es-ES", "fr-FR", "de-DE", "it-IT", "pt-PT", "pt-BR", "nl-NL", "da-DK", "ca-ES",
+        "el-GR", "sv-SE", "pl-PL", "ru-RU", "uk-UA", "bg-BG", "cs-CZ", "sk-SK", "sl-SI", "hr-HR",
+        "lt-LT", "hu-HU", "ro-RO", "fi-FI", "nb-NO", "tr-TR", "zh-CN", "zh-TW", "ja-JP", "ko-KR",
+        "th-TH", "vi-VN", "id-ID", "hi-IN", "ar-SA", "he-IL", "fa-IR",
+    ];
+
+    #[test]
+    fn locales_are_named_after_themselves() {
+        for lang in LOCALES {
+            assert_eq!(locale(lang).expect("locale must exist").name, lang);
+        }
+        assert_eq!(ALL_LOCALES.len(), LOCALES.len());
+    }
+
+    #[test]
+    fn bare_and_hyphenated_language_tags_resolve() {
+        for (input, expected) in [
+            ("es-ES", "es-ES"),
+            ("es", "es-ES"),
+            ("es-MX", "es-ES"),
+            ("pt-BR", "pt-BR"),
+            ("pt-PT", "pt-PT"),
+            ("pt", "pt-BR"),
+            ("zh-Hans", "zh-CN"),
+            ("zh-Hant", "zh-TW"),
+            ("zh-HK", "zh-TW"),
+            ("zh-Hant-HK", "zh-TW"),
+            ("zh", "zh-CN"),
+            ("zz", "en-US"),
+            ("", "en-US"),
+            // BCP 47 tags are case-insensitive
+            ("ES", "es-ES"),
+            ("es-es", "es-ES"),
+            ("PT-br", "pt-BR"),
+            ("EL-GR", "el-GR"),
+            ("ZH-HANT", "zh-TW"),
+        ] {
+            assert_eq!(
+                locale_or_default(input).name,
+                expected,
+                "failed for {input}"
+            );
+        }
+    }
+
+    #[test]
+    fn right_to_left_locales_are_flagged() {
+        for lang in ["ar-SA", "he-IL", "fa-IR"] {
+            assert_eq!(
+                locale_or_default(lang).direction,
+                "rtl",
+                "failed for {lang}"
+            );
+        }
+        for lang in ["en-US", "de-DE", "ja-JP", "ru-RU"] {
+            assert_eq!(
+                locale_or_default(lang).direction,
+                "ltr",
+                "failed for {lang}"
+            );
+        }
+    }
+}