1 files changed, 44 insertions, 0 deletions
diff --git a/macros/src/factory_macro_args.rs b/macros/src/factory_macro_args.rs
new file mode 100644
index 0000000..57517d6
--- /dev/null
+++ b/macros/src/factory_macro_args.rs
@@ -0,0 +1,44 @@
+use syn::parse::Parse;
+use syn::punctuated::Punctuated;
+use syn::Token;
+
+use crate::macro_flag::MacroFlag;
+use crate::util::iterator_ext::IteratorExt;
+
+pub const FACTORY_MACRO_FLAGS: &[&str] = &["async"];
+
+pub struct FactoryMacroArgs
+{
+    pub flags: Punctuated<MacroFlag, Token![,]>,
+}
+
+impl Parse for FactoryMacroArgs
+{
+    fn parse(input: syn::parse::ParseStream) -> syn::Result<Self>
+    {
+        let flags = Punctuated::<MacroFlag, Token![,]>::parse_terminated(input)?;
+
+        for flag in &flags {
+            let flag_str = flag.flag.to_string();
+
+            if !FACTORY_MACRO_FLAGS.contains(&flag_str.as_str()) {
+                return Err(input.error(format!(
+                    "Unknown flag '{}'. Expected one of [ {} ]",
+                    flag_str,
+                    FACTORY_MACRO_FLAGS.join(",")
+                )));
+            }
+        }
+
+        let flag_names = flags
+            .iter()
+            .map(|flag| flag.flag.to_string())
+            .collect::<Vec<_>>();
+
+        if let Some(dupe_flag_name) = flag_names.iter().find_duplicate() {
+            return Err(input.error(format!("Duplicate flag '{}'", dupe_flag_name)));
+        }
+
+        Ok(Self { flags })
+    }
+}