Add some compiled_data FFI APIs (#273)

Progress on #272

Author: Manishearth

temporal_capi/Cargo.toml

@@ -24,5 +24,8 @@ num-traits.workspace = true
 temporal_rs = { workspace = true, default-features = false }
 icu_calendar = { version = "2.0.0-beta2", default-features = false }
 
+[features]
+compiled_data = ["temporal_rs/compiled_data"]
+
 [package.metadata.docs.rs]
 all-features = true

temporal_capi/bindings/cpp/temporal_rs/Instant.d.hpp

@@ -10,6 +10,11 @@ pub mod ffi {
     use core::str::{self, FromStr};
     use diplomat_runtime::{DiplomatStr, DiplomatStr16};
 
+    #[cfg(feature = "compiled_data")]
+    use crate::options::ffi::ToStringRoundingOptions;
+    #[cfg(feature = "compiled_data")]
+    use crate::time_zone::ffi::TimeZone;
+
     #[diplomat::opaque]
     pub struct Instant(pub temporal_rs::Instant);
 
@@ -132,6 +137,22 @@ pub mod ffi {
 
             I128Nanoseconds { high, low }
         }
-        // TODO timezone APIs
+
+        #[cfg(feature = "compiled_data")]
+        pub fn to_ixdtf_string_with_compiled_data(
+            &self,
+            zone: Option<&TimeZone>,
+            options: ToStringRoundingOptions,
+            write: &mut DiplomatWrite,
+        ) -> Result<(), TemporalError> {
+            use core::fmt::Write;
+            let string = self.0.to_ixdtf_string(zone.map(|x| &x.0), options.into())?;
+            // throw away the error, this should always succeed
+            let _ = write.write_str(&string);
+
+            Ok(())
+        }
+
+        // TODO non-compiled data timezone APIs
     }
 }

temporal_capi/bindings/cpp/temporal_rs/Instant.hpp

@@ -29,3 +29,5 @@ pub mod plain_date_time;
 pub mod plain_month_day;
 pub mod plain_time;
 pub mod plain_year_month;
+
+pub mod time_zone;

temporal_capi/bindings/cpp/temporal_rs/TimeZone.d.hpp

@@ -0,0 +1,30 @@
+#[diplomat::bridge]
+#[diplomat::abi_rename = "temporal_rs_{0}"]
+#[diplomat::attr(auto, namespace = "temporal_rs")]
+pub mod ffi {
+    use crate::error::ffi::TemporalError;
+    use alloc::boxed::Box;
+    use core::str;
+
+    #[diplomat::opaque]
+    pub struct TimeZone(pub temporal_rs::TimeZone);
+
+    impl TimeZone {
+        pub fn try_from_identifier_str(ident: &DiplomatStr) -> Result<Box<Self>, TemporalError> {
+            let Ok(ident) = str::from_utf8(ident) else {
+                return Err(temporal_rs::TemporalError::range().into());
+            };
+            temporal_rs::TimeZone::try_from_identifier_str(ident)
+                .map(|x| Box::new(TimeZone(x)))
+                .map_err(Into::into)
+        }
+        pub fn try_from_str(ident: &DiplomatStr) -> Result<Box<Self>, TemporalError> {
+            let Ok(ident) = str::from_utf8(ident) else {
+                return Err(temporal_rs::TemporalError::range().into());
+            };
+            temporal_rs::TimeZone::try_from_str(ident)
+                .map(|x| Box::new(TimeZone(x)))
+                .map_err(Into::into)
+        }
+    }
+}