1 files changed, 148 insertions, 0 deletions
diff --git a/intl/icu_capi/src/calendar.rs b/intl/icu_capi/src/calendar.rs
new file mode 100644
index 0000000000..dd4b2dcbaa
--- /dev/null
+++ b/intl/icu_capi/src/calendar.rs
@@ -0,0 +1,148 @@
+// This file is part of ICU4X. For terms of use, please see the file
+// called LICENSE at the top level of the ICU4X source tree
+// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).
+
+#[diplomat::bridge]
+pub mod ffi {
+    use alloc::boxed::Box;
+    use alloc::sync::Arc;
+
+    use core::fmt::Write;
+    use icu_calendar::{AnyCalendar, AnyCalendarKind};
+
+    use crate::errors::ffi::ICU4XError;
+    use crate::locale::ffi::ICU4XLocale;
+    use crate::provider::ffi::ICU4XDataProvider;
+
+    /// The various calendar types currently supported by [`ICU4XCalendar`]
+    #[diplomat::enum_convert(AnyCalendarKind, needs_wildcard)]
+    #[diplomat::rust_link(icu::calendar::AnyCalendarKind, Enum)]
+    pub enum ICU4XAnyCalendarKind {
+        /// The kind of an Iso calendar
+        Iso = 0,
+        /// The kind of a Gregorian calendar
+        Gregorian = 1,
+        /// The kind of a Buddhist calendar
+        Buddhist = 2,
+        /// The kind of a Japanese calendar with modern eras
+        Japanese = 3,
+        /// The kind of a Japanese calendar with modern and historic eras
+        JapaneseExtended = 4,
+        /// The kind of an Ethiopian calendar, with Amete Mihret era
+        Ethiopian = 5,
+        /// The kind of an Ethiopian calendar, with Amete Alem era
+        EthiopianAmeteAlem = 6,
+        /// The kind of a Indian calendar
+        Indian = 7,
+        /// The kind of a Coptic calendar
+        Coptic = 8,
+        /// The kind of a Dangi calendar
+        Dangi = 9,
+        /// The kind of a Chinese calendar
+        Chinese = 10,
+        /// The kind of a Hebrew calendar
+        Hebrew = 11,
+        /// The kind of a Islamic civil calendar
+        IslamicCivil = 12,
+        /// The kind of a Islamic observational calendar
+        IslamicObservational = 13,
+        /// The kind of a Islamic tabular calendar
+        IslamicTabular = 14,
+        /// The kind of a Islamic Umm al-Qura calendar
+        IslamicUmmAlQura = 15,
+        /// The kind of a Persian calendar
+        Persian = 16,
+        /// The kind of a Roc calendar
+        Roc = 17,
+    }
+
+    impl ICU4XAnyCalendarKind {
+        /// Read the calendar type off of the -u-ca- extension on a locale.
+        ///
+        /// Errors if there is no calendar on the locale or if the locale's calendar
+        /// is not known or supported.
+        #[diplomat::rust_link(icu::calendar::AnyCalendarKind::get_for_locale, FnInEnum)]
+        pub fn get_for_locale(locale: &ICU4XLocale) -> Result<ICU4XAnyCalendarKind, ()> {
+            AnyCalendarKind::get_for_locale(&locale.0)
+                .map(Into::into)
+                .ok_or(())
+        }
+
+        /// Obtain the calendar type given a BCP-47 -u-ca- extension string.
+        ///
+        /// Errors if the calendar is not known or supported.
+        #[diplomat::rust_link(icu::calendar::AnyCalendarKind::get_for_bcp47_value, FnInEnum)]
+        #[diplomat::rust_link(
+            icu::calendar::AnyCalendarKind::get_for_bcp47_string,
+            FnInEnum,
+            hidden
+        )]
+        #[diplomat::rust_link(
+            icu::calendar::AnyCalendarKind::get_for_bcp47_bytes,
+            FnInEnum,
+            hidden
+        )]
+        pub fn get_for_bcp47(s: &str) -> Result<ICU4XAnyCalendarKind, ()> {
+            let s = s.as_bytes(); // #2520
+            AnyCalendarKind::get_for_bcp47_bytes(s)
+                .map(Into::into)
+                .ok_or(())
+        }
+
+        /// Obtain the string suitable for use in the -u-ca- extension in a BCP47 locale.
+        #[diplomat::rust_link(icu::calendar::AnyCalendarKind::as_bcp47_string, FnInEnum)]
+        #[diplomat::rust_link(icu::calendar::AnyCalendarKind::as_bcp47_value, FnInEnum, hidden)]
+        pub fn bcp47(
+            self,
+            write: &mut diplomat_runtime::DiplomatWriteable,
+        ) -> Result<(), ICU4XError> {
+            let kind = AnyCalendarKind::from(self);
+            Ok(write.write_str(kind.as_bcp47_string())?)
+        }
+    }
+
+    #[diplomat::opaque]
+    #[diplomat::transparent_convert]
+    #[diplomat::rust_link(icu::calendar::AnyCalendar, Enum)]
+    pub struct ICU4XCalendar(pub Arc<AnyCalendar>);
+
+    impl ICU4XCalendar {
+        /// Creates a new [`ICU4XCalendar`] from the specified date and time.
+        #[diplomat::rust_link(icu::calendar::AnyCalendar::new_for_locale, FnInEnum)]
+        pub fn create_for_locale(
+            provider: &ICU4XDataProvider,
+            locale: &ICU4XLocale,
+        ) -> Result<Box<ICU4XCalendar>, ICU4XError> {
+            let locale = locale.to_datalocale();
+
+            Ok(Box::new(ICU4XCalendar(Arc::new(call_constructor!(
+                AnyCalendar::new_for_locale [r => Ok(r)],
+                AnyCalendar::try_new_for_locale_with_any_provider,
+                AnyCalendar::try_new_for_locale_with_buffer_provider,
+                provider,
+                &locale
+            )?))))
+        }
+
+        /// Creates a new [`ICU4XCalendar`] from the specified date and time.
+        #[diplomat::rust_link(icu::calendar::AnyCalendar::new, FnInEnum)]
+        pub fn create_for_kind(
+            provider: &ICU4XDataProvider,
+            kind: ICU4XAnyCalendarKind,
+        ) -> Result<Box<ICU4XCalendar>, ICU4XError> {
+            Ok(Box::new(ICU4XCalendar(Arc::new(call_constructor!(
+                AnyCalendar::new [r => Ok(r)],
+                AnyCalendar::try_new_with_any_provider,
+                AnyCalendar::try_new_with_buffer_provider,
+                provider,
+                kind.into()
+            )?))))
+        }
+
+        /// Returns the kind of this calendar
+        #[diplomat::rust_link(icu::calendar::AnyCalendar::kind, FnInEnum)]
+        pub fn kind(&self) -> ICU4XAnyCalendarKind {
+            self.0.kind().into()
+        }
+    }
+}