1 files changed, 67 insertions, 0 deletions
diff --git a/macros/src/injectable/macro_args.rs b/macros/src/injectable/macro_args.rs
new file mode 100644
index 0000000..50d4087
--- /dev/null
+++ b/macros/src/injectable/macro_args.rs
@@ -0,0 +1,67 @@
+use syn::parse::{Parse, ParseStream};
+use syn::punctuated::Punctuated;
+use syn::{Token, TypePath};
+
+use crate::macro_flag::MacroFlag;
+use crate::util::iterator_ext::IteratorExt;
+
+pub const INJECTABLE_MACRO_FLAGS: &[&str] = &["no_doc_hidden", "async"];
+
+pub struct InjectableMacroArgs
+{
+    pub interface: Option<TypePath>,
+    pub flags: Punctuated<MacroFlag, Token![,]>,
+}
+
+impl Parse for InjectableMacroArgs
+{
+    fn parse(input: ParseStream) -> syn::Result<Self>
+    {
+        let interface = input.parse::<TypePath>().ok();
+
+        if interface.is_some() {
+            let comma_input_lookahead = input.lookahead1();
+
+            if !comma_input_lookahead.peek(Token![,]) {
+                return Ok(Self {
+                    interface,
+                    flags: Punctuated::new(),
+                });
+            }
+
+            input.parse::<Token![,]>()?;
+        }
+
+        if input.is_empty() {
+            return Ok(Self {
+                interface,
+                flags: Punctuated::new(),
+            });
+        }
+
+        let flags = Punctuated::<MacroFlag, Token![,]>::parse_terminated(input)?;
+
+        for flag in &flags {
+            let flag_str = flag.flag.to_string();
+
+            if !INJECTABLE_MACRO_FLAGS.contains(&flag_str.as_str()) {
+                return Err(input.error(format!(
+                    "Unknown flag '{}'. Expected one of [ {} ]",
+                    flag_str,
+                    INJECTABLE_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 { interface, flags })
+    }
+}