1 files changed, 54 insertions, 0 deletions
diff --git a/third_party/rust/time-macros/src/format_description/public/mod.rs b/third_party/rust/time-macros/src/format_description/public/mod.rs
new file mode 100644
index 0000000000..ccb0b6e2a3
--- /dev/null
+++ b/third_party/rust/time-macros/src/format_description/public/mod.rs
@@ -0,0 +1,54 @@
+mod component;
+pub(super) mod modifier;
+
+use proc_macro::{Literal, TokenStream};
+
+pub(crate) use self::component::Component;
+use crate::to_tokens::ToTokenStream;
+
+#[allow(variant_size_differences)]
+pub(crate) enum OwnedFormatItem {
+    Literal(Box<[u8]>),
+    Component(Component),
+    Compound(Box<[Self]>),
+    Optional(Box<Self>),
+    First(Box<[Self]>),
+}
+
+impl ToTokenStream for OwnedFormatItem {
+    fn append_to(self, ts: &mut TokenStream) {
+        match self {
+            Self::Literal(bytes) => quote_append! { ts
+                ::time::format_description::FormatItem::Literal {
+                    0: #(Literal::byte_string(bytes.as_ref()))
+                }
+            },
+            Self::Component(component) => quote_append! { ts
+                ::time::format_description::FormatItem::Component { 0: #S(component) }
+            },
+            Self::Compound(items) => {
+                let items = items
+                    .into_vec()
+                    .into_iter()
+                    .map(|item| quote! { #S(item), })
+                    .collect::<TokenStream>();
+                quote_append! { ts
+                    ::time::format_description::FormatItem::Compound { 0: &[#S(items)] }
+                }
+            }
+            Self::Optional(item) => quote_append! {ts
+                ::time::format_description::FormatItem::Optional { 0: &#S(*item) }
+            },
+            Self::First(items) => {
+                let items = items
+                    .into_vec()
+                    .into_iter()
+                    .map(|item| quote! { #S(item), })
+                    .collect::<TokenStream>();
+                quote_append! { ts
+                    ::time::format_description::FormatItem::First { 0: &[#S(items)] }
+                }
+            }
+        }
+    }
+}