1 files changed, 168 insertions, 0 deletions
diff --git a/intl/locale/rust/unic-langid-ffi/src/lib.rs b/intl/locale/rust/unic-langid-ffi/src/lib.rs
new file mode 100644
index 0000000000..804a4341e1
--- /dev/null
+++ b/intl/locale/rust/unic-langid-ffi/src/lib.rs
@@ -0,0 +1,168 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use nsstring::{nsACString, nsCStr, nsCString};
+use thin_vec::ThinVec;
+pub use unic_langid::{subtags, CharacterDirection, LanguageIdentifier, LanguageIdentifierError};
+
+pub fn new_langid_for_mozilla(
+    name: &nsACString,
+) -> Result<LanguageIdentifier, LanguageIdentifierError> {
+    if name.eq_ignore_ascii_case(b"ja-jp-mac") {
+        "ja-JP-macos".parse()
+    } else {
+        // Cut out any `.FOO` like `en-US.POSIX`.
+        let mut name: &[u8] = name.as_ref();
+        if let Some(ptr) = name.iter().position(|b| b == &b'.') {
+            name = &name[..ptr];
+        }
+        LanguageIdentifier::from_bytes(name)
+    }
+}
+
+#[no_mangle]
+pub extern "C" fn unic_langid_canonicalize(name: &mut nsACString) -> bool {
+    let langid = new_langid_for_mozilla(name);
+
+    let result = langid.is_ok();
+
+    name.assign(&langid.unwrap_or_default().to_string());
+
+    result
+}
+
+#[no_mangle]
+pub extern "C" fn unic_langid_new(
+    name: &nsACString,
+    ret_val: &mut bool,
+) -> *mut LanguageIdentifier {
+    let langid = new_langid_for_mozilla(name);
+
+    *ret_val = langid.is_ok();
+    Box::into_raw(Box::new(langid.unwrap_or_default()))
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn unic_langid_destroy(langid: *mut LanguageIdentifier) {
+    let _ = Box::from_raw(langid);
+}
+
+#[no_mangle]
+pub extern "C" fn unic_langid_as_string(langid: &mut LanguageIdentifier, ret_val: &mut nsACString) {
+    ret_val.assign(&langid.to_string());
+}
+
+#[no_mangle]
+pub extern "C" fn unic_langid_get_language<'a>(
+    langid: &'a LanguageIdentifier,
+    out: &mut nsCStr<'a>,
+) {
+    *out = nsCStr::from(langid.language.as_str());
+}
+
+#[no_mangle]
+pub extern "C" fn unic_langid_set_language(
+    langid: &mut LanguageIdentifier,
+    string: &nsACString,
+) -> bool {
+    subtags::Language::from_bytes(string)
+        .map(|lang| langid.language = lang)
+        .is_ok()
+}
+
+#[no_mangle]
+pub extern "C" fn unic_langid_clear_language(langid: &mut LanguageIdentifier) {
+    langid.language.clear()
+}
+
+#[no_mangle]
+pub extern "C" fn unic_langid_get_script<'a>(langid: &'a LanguageIdentifier, out: &mut nsCStr<'a>) {
+    *out = nsCStr::from(langid.script.as_ref().map_or("", |s| s.as_str()));
+}
+
+#[no_mangle]
+pub extern "C" fn unic_langid_set_script(
+    langid: &mut LanguageIdentifier,
+    string: &nsACString,
+) -> bool {
+    subtags::Script::from_bytes(string)
+        .map(|script| langid.script = Some(script))
+        .is_ok()
+}
+
+#[no_mangle]
+pub extern "C" fn unic_langid_clear_script(langid: &mut LanguageIdentifier) {
+    langid.script = None;
+}
+
+#[no_mangle]
+pub extern "C" fn unic_langid_get_region<'a>(langid: &'a LanguageIdentifier, out: &mut nsCStr<'a>) {
+    *out = nsCStr::from(langid.region.as_ref().map_or("", |s| s.as_str()));
+}
+
+#[no_mangle]
+pub extern "C" fn unic_langid_set_region(
+    langid: &mut LanguageIdentifier,
+    string: &nsACString,
+) -> bool {
+    subtags::Region::from_bytes(string)
+        .map(|region| langid.region = Some(region))
+        .is_ok()
+}
+
+#[no_mangle]
+pub extern "C" fn unic_langid_clear_region(langid: &mut LanguageIdentifier) {
+    langid.region = None;
+}
+
+#[no_mangle]
+pub extern "C" fn unic_langid_get_variants(
+    langid: &LanguageIdentifier,
+    variants: &mut ThinVec<nsCString>,
+) {
+    for v in langid.variants() {
+        variants.push(v.as_str().into());
+    }
+}
+
+#[no_mangle]
+pub extern "C" fn unic_langid_set_variants(
+    langid: &mut LanguageIdentifier,
+    variants: &ThinVec<nsCString>,
+) -> bool {
+    variants
+        .iter()
+        .map(|v| subtags::Variant::from_bytes(v))
+        .collect::<Result<Vec<_>, _>>()
+        .map(|variants| langid.set_variants(&variants))
+        .is_ok()
+}
+
+#[no_mangle]
+pub extern "C" fn unic_langid_clear_variants(langid: &mut LanguageIdentifier) {
+    langid.clear_variants()
+}
+
+#[no_mangle]
+pub extern "C" fn unic_langid_matches(
+    langid: &LanguageIdentifier,
+    other: &LanguageIdentifier,
+    self_as_range: bool,
+    other_as_range: bool,
+) -> bool {
+    langid.matches(other, self_as_range, other_as_range)
+}
+
+#[no_mangle]
+pub extern "C" fn unic_langid_maximize(langid: &mut LanguageIdentifier) -> bool {
+    langid.maximize()
+}
+
+#[no_mangle]
+pub extern "C" fn unic_langid_is_rtl(name: &nsACString) -> bool {
+    match new_langid_for_mozilla(name) {
+        Ok(langid) => langid.character_direction() == CharacterDirection::RTL,
+        Err(_) => false,
+    }
+}