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use serde_derive::{Deserialize, Serialize};
bitflags::bitflags! {
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
pub struct Extensions: usize {
const UNWRAP_NEWTYPES = 0x1;
const IMPLICIT_SOME = 0x2;
const UNWRAP_VARIANT_NEWTYPES = 0x4;
}
}
impl Extensions {
/// Creates an extension flag from an ident.
pub fn from_ident(ident: &[u8]) -> Option<Extensions> {
match ident {
b"unwrap_newtypes" => Some(Extensions::UNWRAP_NEWTYPES),
b"implicit_some" => Some(Extensions::IMPLICIT_SOME),
b"unwrap_variant_newtypes" => Some(Extensions::UNWRAP_VARIANT_NEWTYPES),
_ => None,
}
}
}
impl Default for Extensions {
fn default() -> Self {
Extensions::empty()
}
}
#[cfg(test)]
mod tests {
use super::Extensions;
fn roundtrip_extensions(ext: Extensions) {
let ron = crate::to_string(&ext).unwrap();
let ext2: Extensions = crate::from_str(&ron).unwrap();
assert_eq!(ext, ext2);
}
#[test]
fn test_extension_serde() {
roundtrip_extensions(Extensions::default());
roundtrip_extensions(Extensions::UNWRAP_NEWTYPES);
roundtrip_extensions(Extensions::IMPLICIT_SOME);
roundtrip_extensions(Extensions::UNWRAP_VARIANT_NEWTYPES);
roundtrip_extensions(Extensions::UNWRAP_NEWTYPES | Extensions::IMPLICIT_SOME);
roundtrip_extensions(Extensions::UNWRAP_NEWTYPES | Extensions::UNWRAP_VARIANT_NEWTYPES);
roundtrip_extensions(Extensions::IMPLICIT_SOME | Extensions::UNWRAP_VARIANT_NEWTYPES);
roundtrip_extensions(
Extensions::UNWRAP_NEWTYPES
| Extensions::IMPLICIT_SOME
| Extensions::UNWRAP_VARIANT_NEWTYPES,
);
}
}