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use darling::{FromDeriveInput, FromMeta};
use syn::parse_quote;
#[derive(Debug, Default, PartialEq, Eq, FromMeta)]
#[darling(default)]
pub struct Amet {
hello: bool,
world: String,
}
#[derive(Debug, PartialEq, Eq, FromMeta)]
#[darling(rename_all = "snake_case")]
pub enum Lorem {
Ipsum(bool),
Dolor(String),
Sit(Amet),
}
#[derive(Debug, PartialEq, Eq, FromDeriveInput)]
#[darling(attributes(hello))]
pub struct Holder {
lorem: Lorem,
}
impl PartialEq<Lorem> for Holder {
fn eq(&self, other: &Lorem) -> bool {
self.lorem == *other
}
}
#[test]
fn bool_word() {
let di = parse_quote! {
#[hello(lorem(ipsum))]
pub struct Bar;
};
let pr = Holder::from_derive_input(&di).unwrap();
assert_eq!(pr, Lorem::Ipsum(true));
}
#[test]
fn bool_literal() {
let di = parse_quote! {
#[hello(lorem(ipsum = false))]
pub struct Bar;
};
let pr = Holder::from_derive_input(&di).unwrap();
assert_eq!(pr, Lorem::Ipsum(false));
}
#[test]
fn string_literal() {
let di = parse_quote! {
#[hello(lorem(dolor = "Hello"))]
pub struct Bar;
};
let pr = Holder::from_derive_input(&di).unwrap();
assert_eq!(pr, Lorem::Dolor("Hello".to_string()));
}
#[test]
fn struct_nested() {
let di = parse_quote! {
#[hello(lorem(sit(world = "Hello", hello = false)))]
pub struct Bar;
};
let pr = Holder::from_derive_input(&di).unwrap();
assert_eq!(
pr,
Lorem::Sit(Amet {
hello: false,
world: "Hello".to_string(),
})
);
}
#[test]
#[should_panic]
fn format_mismatch() {
let di = parse_quote! {
#[hello(lorem(dolor(world = "Hello", hello = false)))]
pub struct Bar;
};
Holder::from_derive_input(&di).unwrap();
}