Using std maps in datagen

components/datetime/src/provider/time_zones.rs

@@ -47,7 +47,7 @@ pub struct TimeZoneFormatsV1<'data> {
 
 /// TimeZone ID in BCP47 format
 #[repr(transparent)]
-#[derive(Debug, Clone, Copy, Eq, Ord, PartialEq, PartialOrd, yoke::Yokeable, ULE)]
+#[derive(Debug, Clone, Copy, Eq, Ord, PartialEq, PartialOrd, yoke::Yokeable, ULE, Hash)]
 #[cfg_attr(feature = "datagen", derive(serde::Serialize))]
 #[cfg_attr(feature = "serde", derive(serde::Deserialize))]
 pub struct TimeZoneBcp47Id(pub TinyAsciiStr<8>);
@@ -75,7 +75,7 @@ impl<'a> zerovec::maps::ZeroMapKV<'a> for TimeZoneBcp47Id {
 
 /// MetaZone ID in a compact format
 #[repr(transparent)]
-#[derive(Debug, Clone, Copy, Eq, Ord, PartialEq, PartialOrd, yoke::Yokeable, ULE)]
+#[derive(Debug, Clone, Copy, Eq, Ord, PartialEq, PartialOrd, yoke::Yokeable, ULE, Hash)]
 #[cfg_attr(feature = "datagen", derive(serde::Serialize))]
 #[cfg_attr(feature = "serde", derive(serde::Deserialize))]
 pub struct MetaZoneId(pub TinyAsciiStr<4>);

provider/adapters/src/filter/impls.rs

@@ -28,7 +28,7 @@ where
     /// use icu_provider::prelude::*;
     /// use icu_provider_adapters::filter::Filterable;
     ///
-    /// let provider = HelloWorldProvider::new_with_placeholder_data()
+    /// let provider = HelloWorldProvider
     ///     .filterable("Demo no-English filter")
     ///     .filter_by_langid(|langid| langid.language != language!("en"));
     ///
@@ -102,7 +102,7 @@ where
     /// use icu_provider_adapters::filter::Filterable;
     ///
     /// let allowlist = vec![langid!("de"), langid!("zh")];
-    /// let provider = HelloWorldProvider::new_with_placeholder_data()
+    /// let provider = HelloWorldProvider
     ///     .filterable("Demo German+Chinese filter")
     ///     .filter_by_langid_allowlist_strict(&allowlist);
     ///
@@ -162,7 +162,7 @@ where
     /// use icu_provider::prelude::*;
     /// use icu_provider_adapters::filter::Filterable;
     ///
-    /// let provider = HelloWorldProvider::new_with_placeholder_data()
+    /// let provider = HelloWorldProvider
     ///     .filterable("Demo require-langid filter")
     ///     .require_langid();
     ///

provider/adapters/src/filter/mod.rs

@@ -27,7 +27,7 @@
 //! use icu_provider_adapters::filter::Filterable;
 //!
 //! // Only return German data from a HelloWorldProvider:
-//! HelloWorldProvider::new_with_placeholder_data()
+//! HelloWorldProvider
 //!     .filterable("Demo German-only filter")
 //!     .filter_by_langid(|langid| langid.language == language!("de"));
 //! ```

provider/adapters/src/fork/by_key.rs

@@ -45,7 +45,7 @@ use crate::helpers::result_is_err_missing_resource_key;
 ///
 /// let forking_provider = ForkByKeyProvider(
 ///     DummyBufferProvider,
-///     HelloWorldProvider::new_with_placeholder_data().into_json_provider(),
+///     HelloWorldProvider.into_json_provider(),
 /// );
 ///
 /// let data_provider = forking_provider.as_deserializing();
@@ -74,11 +74,11 @@ use crate::helpers::result_is_err_missing_resource_key;
 /// use icu_provider_adapters::fork::by_key::ForkByKeyProvider;
 ///
 /// let forking_provider = ForkByKeyProvider(
-///     HelloWorldProvider::new_with_placeholder_data()
+///     HelloWorldProvider
 ///         .into_json_provider()
 ///         .filterable("Chinese")
 ///         .filter_by_langid(|langid| langid.language == language!("zh")),
-///     HelloWorldProvider::new_with_placeholder_data()
+///     HelloWorldProvider
 ///         .into_json_provider()
 ///         .filterable("German")
 ///         .filter_by_langid(|langid| langid.language == language!("de")),
@@ -204,11 +204,11 @@ where
 ///
 /// let forking_provider = MultiForkByKeyProvider {
 ///     providers: vec![
-///         HelloWorldProvider::new_with_placeholder_data()
+///         HelloWorldProvider
 ///             .into_json_provider()
 ///             .filterable("Chinese")
 ///             .filter_by_langid(|langid| langid.language == language!("zh")),
-///         HelloWorldProvider::new_with_placeholder_data()
+///         HelloWorldProvider
 ///             .into_json_provider()
 ///             .filterable("German")
 ///             .filter_by_langid(|langid| langid.language == language!("de")),

provider/blob/Cargo.toml

@@ -36,7 +36,6 @@ zerovec = { version = "0.7", path = "../../utils/zerovec", features = ["serde",
 
 # For the export feature
 log = { version = "0.4", optional = true }
-litemap = { version = "0.4", path = "../../utils/litemap/", optional = true }
 
 [dev-dependencies]
 icu_locid = { version = "0.6", path = "../../components/locid", features = ["serde"] }
@@ -50,7 +49,6 @@ export = [
     "log",
     "postcard/alloc",
     "std", 
-    "litemap",
     "icu_provider/datagen",
     "zerovec/serde",
 ]

provider/core/Cargo.toml

@@ -58,7 +58,6 @@ displaydoc = { version = "0.2.3", default-features = false }
 yoke = { version = "0.6.0", path = "../../utils/yoke", features = ["derive"] }
 zerofrom = { version = "0.1.0", path = "../../utils/zerofrom", features = ["derive"] }
 zerovec = { version = "0.7.0", path = "../../utils/zerovec", features = ["derive"]}
-litemap = { version = "0.4.0", path = "../../utils/litemap" }
 stable_deref_trait = { version = "1.2.0", default-features = false }
 
 log = { version = "0.4", optional = true }

provider/core/src/buf.rs

@@ -31,7 +31,7 @@ impl DataMarker for BufferMarker {
 /// use icu_provider::hello_world::*;
 /// use icu_provider::prelude::*;
 ///
-/// let buffer_provider = HelloWorldProvider::new_with_placeholder_data().into_json_provider();
+/// let buffer_provider = HelloWorldProvider.into_json_provider();
 ///
 /// let data_provider = buffer_provider.as_deserializing();
 ///

provider/core/src/hello_world.rs

@@ -16,8 +16,6 @@ use crate::zerofrom::{self, *};
 use alloc::borrow::Cow;
 use alloc::string::String;
 use core::fmt::Debug;
-use icu_locid::locale;
-use litemap::LiteMap;
 
 /// A struct containing "Hello World" in the requested language.
 #[derive(Debug, PartialEq, Clone, Yokeable, ZeroFrom)]
@@ -61,9 +59,7 @@ impl ResourceMarker for HelloWorldV1Marker {
 /// use icu_provider::hello_world::*;
 /// use icu_provider::prelude::*;
 ///
-/// let provider = HelloWorldProvider::new_with_placeholder_data();
-///
-/// let german_hello_world: DataPayload<HelloWorldV1Marker> = provider
+/// let german_hello_world: DataPayload<HelloWorldV1Marker> = HelloWorldProvider
 ///     .load_resource(&DataRequest {
 ///         options: locale!("de").into(),
 ///         metadata: Default::default(),
@@ -75,42 +71,30 @@ impl ResourceMarker for HelloWorldV1Marker {
 /// assert_eq!("Hallo Welt", german_hello_world.get().message);
 /// ```
 #[derive(Debug, PartialEq, Default)]
-pub struct HelloWorldProvider {
-    map: LiteMap<ResourceOptions, Cow<'static, str>>,
-}
+pub struct HelloWorldProvider;
 
 impl HelloWorldProvider {
-    pub const DATA: &'static [(icu_locid::Locale, &'static str)] = &[
-        (locale!("bn"), "ওহে বিশ্ব"),
-        (locale!("cs"), "Ahoj světe"),
-        (locale!("de"), "Hallo Welt"),
-        (locale!("el"), "Καλημέρα κόσμε"),
-        (locale!("en"), "Hello World"),
-        (locale!("eo"), "Saluton, Mondo"),
-        (locale!("fa"), "سلام دنیا‎"),
-        (locale!("fi"), "hei maailma"),
-        (locale!("is"), "Halló, heimur"),
-        (locale!("ja"), "こんにちは世界"),
-        (locale!("la"), "Ave, munde"),
-        (locale!("pt"), "Olá, mundo"),
-        (locale!("ro"), "Salut, lume"),
-        (locale!("ru"), "Привет, мир"),
-        (locale!("vi"), "Xin chào thế giới"),
-        (locale!("zh"), "你好世界"),
+    // Data from https://en.wiktionary.org/wiki/Hello_World#Translations
+    // Keep this sorted!
+    const DATA: &'static [(&'static str, &'static str)] = &[
+        ("bn", "ওহে বিশ্ব"),
+        ("cs", "Ahoj světe"),
+        ("de", "Hallo Welt"),
+        ("el", "Καλημέρα κόσμε"),
+        ("en", "Hello World"),
+        ("eo", "Saluton, Mondo"),
+        ("fa", "سلام دنیا‎"),
+        ("fi", "hei maailma"),
+        ("is", "Halló, heimur"),
+        ("ja", "こんにちは世界"),
+        ("la", "Ave, munde"),
+        ("pt", "Olá, mundo"),
+        ("ro", "Salut, lume"),
+        ("ru", "Привет, мир"),
+        ("vi", "Xin chào thế giới"),
+        ("zh", "你好世界"),
     ];
 
-    /// Creates a [`HelloWorldProvider`] pre-populated with hardcoded data from Wiktionary.
-    pub fn new_with_placeholder_data() -> HelloWorldProvider {
-        // Data from https://en.wiktionary.org/wiki/Hello_World#Translations
-        HelloWorldProvider {
-            map: Self::DATA
-                .iter()
-                .cloned()
-                .map(|(loc, value)| (loc.into(), value.into()))
-                .collect(),
-        }
-    }
-
     /// Converts this provider into one that serves JSON blobs of the same data.
     pub fn into_json_provider(self) -> HelloWorldJsonProvider {
         HelloWorldJsonProvider(self)
@@ -122,11 +106,14 @@ impl ResourceProvider<HelloWorldV1Marker> for HelloWorldProvider {
         &self,
         req: &DataRequest,
     ) -> Result<DataResponse<HelloWorldV1Marker>, DataError> {
-        let data = self
-            .map
-            .get(&req.options)
-            .map(|s| HelloWorldV1 { message: s.clone() })
-            .ok_or_else(|| DataErrorKind::MissingLocale.with_key(HelloWorldV1Marker::KEY))?;
+        #[allow(clippy::indexing_slicing)] // binary_search
+        let data = Self::DATA
+            .binary_search_by(|(k, _)| req.options.strict_cmp(k.as_bytes()).reverse())
+            .map(|i| Self::DATA[i].1)
+            .map(|s| HelloWorldV1 {
+                message: Cow::Borrowed(s),
+            })
+            .map_err(|_| DataErrorKind::MissingLocale.with_req(HelloWorldV1Marker::KEY, req))?;
         let metadata = DataResponseMetadata {
             data_langid: Some(req.options.get_langid()),
             ..Default::default()
@@ -170,20 +157,19 @@ impl BufferProvider for HelloWorldJsonProvider {
 #[cfg(feature = "datagen")]
 impl IterableResourceProvider<HelloWorldV1Marker> for HelloWorldProvider {
     fn supported_options(&self) -> Result<Vec<ResourceOptions>, DataError> {
-        Ok(self
-            .map
-            .iter_keys()
-            .cloned()
+        #[allow(clippy::unwrap_used)] // datagen
+        Ok(Self::DATA
+            .iter()
+            .map(|(s, _)| s.parse::<icu_locid::LanguageIdentifier>().unwrap())
             .map(ResourceOptions::from)
             .collect())
     }
 }
 
 #[test]
 fn test_iter() {
-    let provider = HelloWorldProvider::new_with_placeholder_data();
-    let mut supported_langids: Vec<ResourceOptions> = provider.supported_options().unwrap();
-    supported_langids.sort();
+    use icu_locid::locale;
+    let supported_langids: Vec<ResourceOptions> = HelloWorldProvider.supported_options().unwrap();
 
     assert_eq!(
         supported_langids,

provider/core/src/resource.rs

@@ -118,6 +118,19 @@ pub struct ResourceKey {
     hash: ResourceKeyHash,
 }
 
+// I don't think this lint makes sense, see https://github.com/rust-lang/rust-clippy/issues/2627.
+// It's not possible to violate the hash invariant (k1 == k2 -> hash(k1) == hash(k2)) without
+// using non-determinism or unsafe code when PartialEq is derived.
+#[allow(clippy::derive_hash_xor_eq)]
+
+// Custom implementation to avoid hashing the path.
+impl core::hash::Hash for ResourceKey {
+    #[inline]
+    fn hash<H: core::hash::Hasher>(&self, state: &mut H) {
+        self.hash.hash(state)
+    }
+}
+
 #[cfg(test)]
 static_assertions::const_assert_eq!(24, core::mem::size_of::<ResourceKey>());
 

provider/datagen/Cargo.toml

@@ -62,7 +62,6 @@ icu_codepointtrie_builder = { path = "../../utils/codepointtrie/builder" }
 icu_locid = { version = "0.6", path = "../../components/locid", features = ["std"]}
 icu_uniset = { version = "0.5", path = "../../utils/uniset", features = ["serde"] }
 itertools = "0.10"
-litemap = { version = "0.4.0", path = "../../utils/litemap" }
 log = "0.4"
 rayon = "1.5"
 serde = { version = "1.0", default-features = false, features = ["derive", "alloc"] }

provider/datagen/src/databake.rs

@@ -6,7 +6,6 @@ use databake::{quote, CrateEnv, TokenStream};
 use icu_provider::datagen::*;
 use icu_provider::prelude::*;
 use itertools::Itertools;
-use litemap::LiteMap;
 use rayon::prelude::*;
 use std::collections::HashMap;
 use std::fs::File;
@@ -31,8 +30,8 @@ pub(crate) struct BakedDataExporter {
     mod_directory: PathBuf,
     pretty: bool,
     insert_feature_gates: bool,
-    // Temporary storage for put_payload: key -> (marker path, options -> bake)
-    data: Mutex<LiteMap<ResourceKey, (SyncTokenStream, LiteMap<ResourceOptions, SyncTokenStream>)>>,
+    // Temporary storage for put_payload: key -> (marker path, bake -> [options])
+    data: Mutex<HashMap<ResourceKey, (SyncTokenStream, HashMap<SyncTokenStream, Vec<String>>)>>,
     // All mod.rs files in the module tree. Because generation is parallel,
     // this will be non-deterministic and have to be sorted later.
     mod_files: Mutex<HashMap<PathBuf, Vec<String>>>,
@@ -117,15 +116,15 @@ impl DataExporter for BakedDataExporter {
         payload: &DataPayload<ExportMarker>,
     ) -> Result<(), DataError> {
         let (payload, marker_type) = payload.tokenize(&self.dependencies);
-        let payload_string = payload.to_string();
-        let mut map = self.data.lock().expect("poison");
-        if !map.contains_key(&key) {
-            map.insert(key, (marker_type.to_string(), LiteMap::new()));
-        }
-        map.get_mut(&key)
-            .unwrap()
+        self.data
+            .lock()
+            .expect("poison")
+            .entry(key)
+            .or_insert_with(|| (marker_type.to_string(), Default::default()))
             .1
-            .insert(options.clone(), payload_string);
+            .entry(payload.to_string())
+            .or_default()
+            .push(options.to_string());
         Ok(())
     }
 
@@ -136,21 +135,11 @@ impl DataExporter for BakedDataExporter {
             .expect("poison")
             .remove(&key)
             .ok_or_else(|| DataError::custom("No data").with_key(key))?;
-        let mut sorted = raw.into_tuple_vec();
-        // Sort by payload bake so we can deduplicate.
-        sorted.sort_by(|(_, a), (_, b)| a.cmp(b));
-
         let mut statics = Vec::new();
         let mut all_options = Vec::new();
 
-        for (payload_bake_string, group) in &sorted
-            .into_iter()
-            .group_by(|(_, payload_bake_string)| payload_bake_string.clone())
-        {
-            // These are sorted because we stably sorted earlier.
-            let options = group
-                .map(|(options, _)| options.to_string())
-                .collect::<Vec<_>>();
+        for (payload_bake_string, mut options) in raw {
+            options.sort();
             let ident_string = options
                 .iter()
                 .map(|options| {
@@ -171,7 +160,6 @@ impl DataExporter for BakedDataExporter {
             statics.push((ident_string, payload_bake_string));
         }
 
-        // Not necessary for functionality, but prettier
         statics.sort_unstable_by(|(a, _), (b, _)| a.cmp(b));
 
         let statics = statics

provider/datagen/src/registry.rs

@@ -121,7 +121,7 @@ macro_rules! create_datagen_provider {
         icu_provider_adapters::make_forking_provider!(
             icu_provider_adapters::fork::by_key::ForkByKeyProvider,
             [
-                icu_provider::hello_world::HelloWorldProvider::new_with_placeholder_data(),
+                icu_provider::hello_world::HelloWorldProvider,
                 $(<$constructor>::from(__source)),+,
             ]
         )
@@ -202,7 +202,7 @@ macro_rules! create_datagen_provider {
         icu_provider_adapters::make_forking_provider!(
             icu_provider_adapters::fork::by_key::ForkByKeyProvider,
             [
-                icu_provider::hello_world::HelloWorldProvider::new_with_placeholder_data(),
+                icu_provider::hello_world::HelloWorldProvider,
                 $(<$constructor>::from(__source)),+,
             ]
         )