1 files changed, 43 insertions, 0 deletions
diff --git a/nrf-softdevice-macro/src/uuid.rs b/nrf-softdevice-macro/src/uuid.rs
new file mode 100644
index 0000000..950c3fd
--- /dev/null
+++ b/nrf-softdevice-macro/src/uuid.rs
@@ -0,0 +1,43 @@
+use core::str::FromStr;
+use darling::FromMeta;
+use proc_macro2::TokenStream as TokenStream2;
+use quote::quote;
+
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
+pub enum Uuid {
+    Uuid16(u16),
+    Uuid128([u8; 16]),
+}
+
+impl FromMeta for Uuid {
+    fn from_string(value: &str) -> darling::Result<Self> {
+        if let Ok(u) = uuid::Uuid::from_str(value) {
+            return Ok(Uuid::Uuid128(*u.as_bytes()));
+        }
+
+        if value.len() == 4 {
+            if let Ok(u) = u16::from_str_radix(value, 16) {
+                return Ok(Uuid::Uuid16(u));
+            }
+        }
+
+        Err(darling::Error::custom(
+            "Invalid UUID (must be a 16-bit or 128-bit UUID)",
+        ))
+    }
+}
+
+impl quote::ToTokens for Uuid {
+    fn to_tokens(&self, tokens: &mut TokenStream2) {
+        match self {
+            Uuid::Uuid16(u) => tokens.extend(quote!(::nrf_softdevice::ble::Uuid::new_16(#u))),
+            Uuid::Uuid128(u) => {
+                let mut s = TokenStream2::new();
+                for b in u {
+                    s.extend(quote!(#b,))
+                }
+                tokens.extend(quote!(::nrf_softdevice::ble::Uuid::new_128(&[#s])));
+            }
+        }
+    }
+}