1 files changed, 42 insertions, 0 deletions
diff --git a/rtic-macros/src/syntax/parse/idle.rs b/rtic-macros/src/syntax/parse/idle.rs
new file mode 100644
index 00000000..124c1366
--- /dev/null
+++ b/rtic-macros/src/syntax/parse/idle.rs
@@ -0,0 +1,42 @@
+use proc_macro2::TokenStream as TokenStream2;
+use syn::{parse, ItemFn};
+
+use crate::syntax::{
+    ast::{Idle, IdleArgs},
+    parse::util,
+};
+
+impl IdleArgs {
+    pub(crate) fn parse(tokens: TokenStream2) -> parse::Result<Self> {
+        crate::syntax::parse::idle_args(tokens)
+    }
+}
+
+impl Idle {
+    pub(crate) fn parse(args: IdleArgs, item: ItemFn) -> parse::Result<Self> {
+        let valid_signature = util::check_fn_signature(&item, false)
+            && item.sig.inputs.len() == 1
+            && util::type_is_bottom(&item.sig.output);
+
+        let name = item.sig.ident.to_string();
+
+        if valid_signature {
+            if let Some((context, Ok(rest))) = util::parse_inputs(item.sig.inputs, &name) {
+                if rest.is_empty() {
+                    return Ok(Idle {
+                        args,
+                        attrs: item.attrs,
+                        context,
+                        name: item.sig.ident,
+                        stmts: item.block.stmts,
+                    });
+                }
+            }
+        }
+
+        Err(parse::Error::new(
+            item.sig.ident.span(),
+            format!("this `#[idle]` function must have signature `fn({name}::Context) -> !`"),
+        ))
+    }
+}