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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) {
let mut bytes = *u.as_bytes();
bytes.reverse(); // Softdevice uses uuids in little endian format.
return Ok(Uuid::Uuid128(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])));
}
}
}
}
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