1 files changed, 35 insertions, 0 deletions
diff --git a/macros/src/factory/type_alias.rs b/macros/src/factory/type_alias.rs
new file mode 100644
index 0000000..64afe57
--- /dev/null
+++ b/macros/src/factory/type_alias.rs
@@ -0,0 +1,35 @@
+use quote::ToTokens;
+use syn::parse::{Parse, ParseStream};
+use syn::punctuated::Punctuated;
+use syn::{parse, ItemType, Token, Type};
+
+use crate::fn_trait::FnTrait;
+
+pub struct FactoryTypeAlias
+{
+    pub type_alias: ItemType,
+    pub factory_interface: FnTrait,
+    pub arg_types: Punctuated<Type, Token![,]>,
+    pub return_type: Type,
+}
+
+impl Parse for FactoryTypeAlias
+{
+    fn parse(input: ParseStream) -> syn::Result<Self>
+    {
+        let type_alias = match input.parse::<ItemType>() {
+            Ok(type_alias) => Ok(type_alias),
+            Err(_) => Err(input.error("Expected a type alias")),
+        }?;
+
+        let aliased_fn_trait =
+            parse::<FnTrait>(type_alias.ty.as_ref().to_token_stream().into())?;
+
+        Ok(Self {
+            type_alias,
+            factory_interface: aliased_fn_trait.clone(),
+            arg_types: aliased_fn_trait.inputs,
+            return_type: aliased_fn_trait.output,
+        })
+    }
+}