ZeroTrie: add Bake, Yoke, and ZeroFrom impls

sffc · Sep 11, 2023 · b21e234 · b21e234
1 parent 065b90f
commit b21e234
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Showing 3 changed files with 148 additions and 3 deletions.
diff --git a/experimental/zerotrie/Cargo.toml b/experimental/zerotrie/Cargo.toml
@@ -24,9 +24,12 @@ all-features = true
 denylist = ["bench"]
 
 [dependencies]
+databake = { workspace = true, features = ["derive"], optional = true }
 displaydoc = { version = "0.2.3", default-features = false }
 litemap = { workspace = true, features = ["alloc"], optional = true }
 serde = { version = "1.0", optional = true }
+yoke = { workspace = true, features = ["derive"], optional = true }
+zerofrom = { workspace = true, optional = true }
 zerovec = { workspace = true, optional = true }
 
 [dev-dependencies]
@@ -50,8 +53,11 @@ bench = false  # This option is required for Benchmark CI
 default = []
 bench = ["litemap"]
 alloc = []
+databake = ["dep:databake", "zerovec?/databake"]
 litemap = ["dep:litemap", "alloc"]
 serde = ["dep:serde", "dep:litemap", "alloc", "litemap/serde", "zerovec?/serde"]
+yoke = ["dep:yoke"]
+zerofrom = ["dep:zerofrom"]
 
 [[bench]]
 name = "overview"

diff --git a/experimental/zerotrie/src/zerotrie.rs b/experimental/zerotrie/src/zerotrie.rs
@@ -61,6 +61,8 @@ use litemap::LiteMap;
 /// # Ok::<_, zerotrie::ZeroTrieError>(())
 /// ```
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
+// Note: The absence of the following derive does not cause any test failures in this crate
+#[cfg_attr(feature = "yoke", derive(yoke::Yokeable))]
 pub struct ZeroTrie<Store>(pub(crate) ZeroTrieFlavor<Store>);
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
@@ -96,8 +98,10 @@ pub(crate) enum ZeroTrieFlavor<Store> {
 /// ```
 #[repr(transparent)]
 #[derive(Debug, Default, Clone, Copy, PartialEq, Eq)]
+#[cfg_attr(feature = "databake", derive(databake::Bake), databake(path = zerotrie))]
 pub struct ZeroTrieSimpleAscii<Store: ?Sized> {
-    pub(crate) store: Store,
+    #[doc(hidden)] // for databake, but there are no invariants
+    pub store: Store,
 }
 
 /// A data structure that compactly maps from byte strings to integers.
@@ -126,17 +130,21 @@ pub struct ZeroTrieSimpleAscii<Store: ?Sized> {
 /// ```
 #[repr(transparent)]
 #[derive(Debug, Default, Clone, Copy, PartialEq, Eq)]
+#[cfg_attr(feature = "databake", derive(databake::Bake), databake(path = zerotrie))]
 pub struct ZeroTriePerfectHash<Store: ?Sized> {
-    pub(crate) store: Store,
+    #[doc(hidden)] // for databake, but there are no invariants
+    pub store: Store,
 }
 
 /// A data structure that maps from a large number of byte strings to integers.
 ///
 /// For more information, see [`ZeroTrie`].
 #[repr(transparent)]
 #[derive(Debug, Default, Clone, Copy, PartialEq, Eq)]
+#[cfg_attr(feature = "databake", derive(databake::Bake), databake(path = zerotrie))]
 pub struct ZeroTrieExtendedCapacity<Store: ?Sized> {
-    pub(crate) store: Store,
+    #[doc(hidden)] // for databake, but there are no invariants
+    pub store: Store,
 }
 
 macro_rules! impl_zerotrie_subtype {
@@ -474,6 +482,16 @@ macro_rules! impl_zerotrie_subtype {
                 core::mem::transmute(Store::from_byte_slice_unchecked(bytes))
             }
         }
+        #[cfg(feature = "zerofrom")]
+        impl<'zf, Store1, Store2> zerofrom::ZeroFrom<'zf, $name<Store1>> for $name<Store2>
+        where
+            Store2: zerofrom::ZeroFrom<'zf, Store1>,
+        {
+            #[inline]
+            fn zero_from(other: &'zf $name<Store1>) -> Self {
+                $name::from_store(zerofrom::ZeroFrom::zero_from(&other.store))
+            }
+        }
     };
 }
 
@@ -536,6 +554,19 @@ macro_rules! impl_dispatch {
             ZeroTrieFlavor::ExtendedCapacity(subtype) => subtype.$inner_fn($arg),
         }
     };
+    (&$self:ident, $trait:ident::$inner_fn:ident()) => {
+        match &$self.0 {
+            ZeroTrieFlavor::SimpleAscii(subtype) => {
+                ZeroTrie(ZeroTrieFlavor::SimpleAscii($trait::$inner_fn(subtype)))
+            }
+            ZeroTrieFlavor::PerfectHash(subtype) => {
+                ZeroTrie(ZeroTrieFlavor::PerfectHash($trait::$inner_fn(subtype)))
+            }
+            ZeroTrieFlavor::ExtendedCapacity(subtype) => {
+                ZeroTrie(ZeroTrieFlavor::ExtendedCapacity($trait::$inner_fn(subtype)))
+            }
+        }
+    };
 }
 
 impl<Store> ZeroTrie<Store> {
@@ -625,3 +656,26 @@ where
         Self::try_from_tuple_slice(byte_str_slice).unwrap()
     }
 }
+
+#[cfg(feature = "databake")]
+impl<'zf, Store> databake::Bake for ZeroTrie<Store>
+where
+    Store: databake::Bake,
+{
+    fn bake(&self, env: &databake::CrateEnv) -> databake::TokenStream {
+        use databake::*;
+        let inner = impl_dispatch!(&self, bake(env));
+        quote! { #inner.into_zerotrie() }
+    }
+}
+
+#[cfg(feature = "zerofrom")]
+impl<'zf, Store1, Store2> zerofrom::ZeroFrom<'zf, ZeroTrie<Store1>> for ZeroTrie<Store2>
+where
+    Store2: zerofrom::ZeroFrom<'zf, Store1>,
+{
+    fn zero_from(other: &'zf ZeroTrie<Store1>) -> Self {
+        use zerofrom::ZeroFrom;
+        impl_dispatch!(&other, ZeroFrom::zero_from())
+    }
+}
diff --git a/experimental/zerotrie/tests/derive_test.rs b/experimental/zerotrie/tests/derive_test.rs
@@ -0,0 +1,85 @@
+// 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 ).
+
+#![allow(non_camel_case_types, non_snake_case)]
+
+use zerotrie::ZeroTrie;
+use zerotrie::ZeroTrieExtendedCapacity;
+use zerotrie::ZeroTriePerfectHash;
+use zerotrie::ZeroTrieSimpleAscii;
+use zerovec::ZeroVec;
+
+#[cfg_attr(feature = "yoke", derive(yoke::Yokeable))]
+#[cfg_attr(feature = "zerofrom", derive(zerofrom::ZeroFrom))]
+#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
+#[cfg_attr(feature = "databake", derive(databake::Bake), databake(path = crate))]
+struct DeriveTest_ZeroTrie_ZeroVec<'data> {
+    #[cfg_attr(feature = "serde", serde(borrow))]
+    _data: ZeroTrie<ZeroVec<'data, u8>>,
+}
+
+#[test]
+#[cfg(all(feature = "databake", feature = "alloc"))]
+fn bake_ZeroTrie_ZeroVec() {
+    use databake::*;
+    extern crate std;
+    test_bake!(
+        DeriveTest_ZeroTrie_ZeroVec<'static>,
+        crate::DeriveTest_ZeroTrie_ZeroVec {
+            _data: zerotrie::ZeroTrieSimpleAscii {
+                store: zerovec::ZeroVec::new(),
+            }
+            .into_zerotrie()
+        },
+    );
+}
+
+#[cfg_attr(feature = "yoke", derive(yoke::Yokeable))]
+#[cfg_attr(feature = "zerofrom", derive(zerofrom::ZeroFrom))]
+#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
+#[cfg_attr(feature = "databake", derive(databake::Bake), databake(path = crate))]
+struct DeriveTest_ZeroTrieSimpleAscii_ZeroVec<'data> {
+    #[cfg_attr(feature = "serde", serde(borrow))]
+    _data: ZeroTrieSimpleAscii<ZeroVec<'data, u8>>,
+}
+
+/*
+---- test::bake_ZeroTrieSimpleAscii_ZeroVec stdout ----
+thread 'test::bake_ZeroTrieSimpleAscii_ZeroVec' panicked at 'assertion failed: `(left == right)`
+  left: `"zerotrie :: test :: DeriveTest_ZeroTrieSimpleAscii_ZeroVec { _data : zerotrie :: ZeroTrieSimpleAscii { store : zerovec :: ZeroVec :: new () , } , }"`,
+ right: `"zerotrie :: test :: DeriveTest_ZeroTrieSimpleAscii_ZeroVec { _data : zerotrie :: ZeroTrieSimpleAscii { store : zerovec :: ZeroVec :: new () } , }"`', experimental/zerotrie/src/test.rs:46:5
+*/
+#[test]
+#[ignore] // TODO: Fix (see error message above)
+#[cfg(all(feature = "databake", feature = "alloc"))]
+fn bake_ZeroTrieSimpleAscii_ZeroVec() {
+    use databake::*;
+    extern crate std;
+    test_bake!(
+        DeriveTest_ZeroTrieSimpleAscii_ZeroVec<'static>,
+        crate::DeriveTest_ZeroTrieSimpleAscii_ZeroVec {
+            _data: zerotrie::ZeroTrieSimpleAscii {
+                store: zerovec::ZeroVec::new(),
+            }
+        },
+    );
+}
+
+#[cfg_attr(feature = "yoke", derive(yoke::Yokeable))]
+#[cfg_attr(feature = "zerofrom", derive(zerofrom::ZeroFrom))]
+#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
+#[cfg_attr(feature = "databake", derive(databake::Bake), databake(path = crate))]
+struct DeriveTest_ZeroTriePerfectHash_ZeroVec<'data> {
+    #[cfg_attr(feature = "serde", serde(borrow))]
+    _data: ZeroTriePerfectHash<ZeroVec<'data, u8>>,
+}
+
+#[cfg_attr(feature = "yoke", derive(yoke::Yokeable))]
+#[cfg_attr(feature = "zerofrom", derive(zerofrom::ZeroFrom))]
+#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
+#[cfg_attr(feature = "databake", derive(databake::Bake), databake(path = crate))]
+struct DeriveTest_ZeroTrieExtendedCapacity_ZeroVec<'data> {
+    #[cfg_attr(feature = "serde", serde(borrow))]
+    _data: ZeroTrieExtendedCapacity<ZeroVec<'data, u8>>,
+}