1 unstable release
0.1.0 | Feb 1, 2024 |
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#235 in Procedural macros
140 downloads per month
Used in 4 crates
(2 directly)
32KB
747 lines
from-attr
This crate provides some derive macros for parsing values from attributes.
Inspired
This crate inspired by attribute-derive.
Example
use from_attr::FromAttr;
use syn::{parse_quote, Expr, LitStr, Type};
#[derive(FromAttr)]
#[attribute(idents = [test])]
struct Test {
a: LitStr,
b: Option<String>,
c: Type,
d: Expr,
e: Vec<Type>,
f: bool,
g: bool,
}
let attrs = [
parse_quote!(#[test(a = "a", b = "b", c = (), d = if true { "a" } else { "b" }, e = [(), Debug], f)]),
];
let test = Test::from_attributes(&attrs).unwrap().unwrap().value;
assert_eq!(test.a.value(), "a");
assert_eq!(test.b.unwrap(), "b");
assert!(matches!(test.c, Type::Tuple(_)));
assert!(matches!(test.d, Expr::If(_)));
assert!(test.e.len() == 2);
assert!(test.f);
assert!(!test.g);
More examples can be found in the examples directories.
Dependencies
~0.4–0.9MB
~20K SLoC