1 files changed, 109 insertions, 0 deletions
diff --git a/intl/icu_capi/src/decimal.rs b/intl/icu_capi/src/decimal.rs
new file mode 100644
index 0000000000..290f1c5a63
--- /dev/null
+++ b/intl/icu_capi/src/decimal.rs
@@ -0,0 +1,109 @@
+// 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 icu_decimal::{
+        options::{FixedDecimalFormatterOptions, GroupingStrategy},
+        provider::DecimalSymbolsV1Marker,
+        FixedDecimalFormatter,
+    };
+    use icu_provider_adapters::any_payload::AnyPayloadProvider;
+    use writeable::Writeable;
+
+    use crate::{
+        data_struct::ffi::ICU4XDataStruct, errors::ffi::ICU4XError,
+        fixed_decimal::ffi::ICU4XFixedDecimal, locale::ffi::ICU4XLocale,
+        provider::ffi::ICU4XDataProvider,
+    };
+
+    #[diplomat::opaque]
+    /// An ICU4X Fixed Decimal Format object, capable of formatting a [`ICU4XFixedDecimal`] as a string.
+    #[diplomat::rust_link(icu::decimal::FixedDecimalFormatter, Struct)]
+    pub struct ICU4XFixedDecimalFormatter(pub FixedDecimalFormatter);
+
+    #[diplomat::rust_link(icu::decimal::options::GroupingStrategy, Enum)]
+    pub enum ICU4XFixedDecimalGroupingStrategy {
+        Auto,
+        Never,
+        Always,
+        Min2,
+    }
+
+    impl ICU4XFixedDecimalFormatter {
+        /// Creates a new [`ICU4XFixedDecimalFormatter`] from locale data.
+        #[diplomat::rust_link(icu::decimal::FixedDecimalFormatter::try_new, FnInStruct)]
+        pub fn create_with_grouping_strategy(
+            provider: &ICU4XDataProvider,
+            locale: &ICU4XLocale,
+            grouping_strategy: ICU4XFixedDecimalGroupingStrategy,
+        ) -> Result<Box<ICU4XFixedDecimalFormatter>, ICU4XError> {
+            let locale = locale.to_datalocale();
+
+            let grouping_strategy = match grouping_strategy {
+                ICU4XFixedDecimalGroupingStrategy::Auto => GroupingStrategy::Auto,
+                ICU4XFixedDecimalGroupingStrategy::Never => GroupingStrategy::Never,
+                ICU4XFixedDecimalGroupingStrategy::Always => GroupingStrategy::Always,
+                ICU4XFixedDecimalGroupingStrategy::Min2 => GroupingStrategy::Min2,
+            };
+            let mut options = FixedDecimalFormatterOptions::default();
+            options.grouping_strategy = grouping_strategy;
+            Ok(Box::new(ICU4XFixedDecimalFormatter(call_constructor!(
+                FixedDecimalFormatter::try_new,
+                FixedDecimalFormatter::try_new_with_any_provider,
+                FixedDecimalFormatter::try_new_with_buffer_provider,
+                provider,
+                &locale,
+                options,
+            )?)))
+        }
+
+        /// Creates a new [`ICU4XFixedDecimalFormatter`] from preconstructed locale data in the form of an [`ICU4XDataStruct`]
+        /// constructed from `ICU4XDataStruct::create_decimal_symbols()`.
+        ///
+        /// The contents of the data struct will be consumed: if you wish to use the struct again it will have to be reconstructed.
+        /// Passing a consumed struct to this method will return an error.
+        #[diplomat::attr(dart, disable)]
+        pub fn create_with_decimal_symbols_v1(
+            data_struct: &ICU4XDataStruct,
+            grouping_strategy: ICU4XFixedDecimalGroupingStrategy,
+        ) -> Result<Box<ICU4XFixedDecimalFormatter>, ICU4XError> {
+            let grouping_strategy = match grouping_strategy {
+                ICU4XFixedDecimalGroupingStrategy::Auto => GroupingStrategy::Auto,
+                ICU4XFixedDecimalGroupingStrategy::Never => GroupingStrategy::Never,
+                ICU4XFixedDecimalGroupingStrategy::Always => GroupingStrategy::Always,
+                ICU4XFixedDecimalGroupingStrategy::Min2 => GroupingStrategy::Min2,
+            };
+            let mut options = FixedDecimalFormatterOptions::default();
+            options.grouping_strategy = grouping_strategy;
+            Ok(Box::new(ICU4XFixedDecimalFormatter(
+                FixedDecimalFormatter::try_new_with_any_provider(
+                    &AnyPayloadProvider::from_any_payload::<DecimalSymbolsV1Marker>(
+                        // Note: This clone is free, since cloning AnyPayload is free.
+                        data_struct.0.clone(),
+                    ),
+                    &Default::default(),
+                    options,
+                )?,
+            )))
+        }
+
+        /// Formats a [`ICU4XFixedDecimal`] to a string.
+        #[diplomat::rust_link(icu::decimal::FixedDecimalFormatter::format, FnInStruct)]
+        #[diplomat::rust_link(
+            icu::decimal::FixedDecimalFormatter::format_to_string,
+            FnInStruct,
+            hidden
+        )]
+        pub fn format(
+            &self,
+            value: &ICU4XFixedDecimal,
+            write: &mut diplomat_runtime::DiplomatWriteable,
+        ) -> Result<(), ICU4XError> {
+            self.0.format(&value.0).write_to(write)?;
+            Ok(())
+        }
+    }
+}