7 releases (4 breaking)
new 0.5.0 | Mar 28, 2025 |
---|---|
0.4.2 | Jan 22, 2020 |
0.4.1 | Dec 26, 2019 |
0.3.0 | Jul 9, 2019 |
0.1.1 | Oct 30, 2018 |
#2718 in Procedural macros
9,116 downloads per month
Used in 8 crates
(3 directly)
17KB
346 lines
Helper APIs for Rust procedural macros
This crates provides helper APIs for procedural macros.
Please read the API documentation on docs.rs
APIs to manipulate with attributes
use proc_macro2::Span;
use syn::LitStr;
fn lit_str(s: &str) -> Lit {
Lit::Str(LitStr::new(s, Span::call_site()))
}
fn test_contains_attribute_impl() {
let attr: Attribute = parse_quote!(#[level0(level1, level1_1(level2, level2_1 = "hello"))]);
let attr = [attr];
assert!(!contains_attribute(&attr, &[]));
assert!(!contains_attribute(&attr, &["not"]));
assert!(!contains_attribute(&attr, &["level0"]));
assert!(contains_attribute(&attr, &["level0", "level1"]));
assert!(!contains_attribute(&attr, &["level0", "level1_1"]),);
assert!(contains_attribute(&attr, &["level0", "level1_1", "level2"]),);
assert!(!contains_attribute(
&attr,
&["level0", "level1_1", "level2_1"]
),);
}
#[test]
fn test_get_attribute_value() {
let attr: Attribute = parse_quote!(#[level0(level1 = "hi", level1_1(level2 = "bye"))]);
let attr = [attr];
assert_eq!(get_attribute_value(&attr, &[""]), None);
assert_eq!(get_attribute_value(&attr, &["not"]), None);
assert_eq!(get_attribute_value(&attr, &["level0"]), None);
assert_eq!(
get_attribute_value(&attr, &["level0", "level1"]),
Some(lit_str("hi"))
);
assert_eq!(get_attribute_value(&attr, &["level0", "level1_1"]), None);
assert_eq!(
get_attribute_value(&attr, &["level0", "level1_1", "level2"]),
Some(lit_str("bye"))
);
}
#[test]
fn test_get_attribute_map() {
assert_eq!(
get_attribute_map(
&[
parse_quote!(#[level9]),
parse_quote!(#[level0(level8)]),
parse_quote!(#[level0(level1 = "hi", level1_1(level2 = "bye"))]),
parse_quote!(#[level0(level1 = "hi", level1_1(level2 = "bye"))]),
parse_quote!(#[gen0(gen1 = "amoeba", gen1_1 = "monad", gen1_2(gen2 = "monoid"))])
],
"."
),
vec![
("level9".to_string(), vec![]),
("level0.level8".to_string(), vec![]),
(
"level0.level1".to_string(),
vec![lit_str("hi"), lit_str("hi")],
),
(
"level0.level1_1.level2".to_string(),
vec![lit_str("bye"), lit_str("bye")],
),
("gen0.gen1".to_string(), vec![lit_str("amoeba")]),
("gen0.gen1_1".to_string(), vec![lit_str("monad")]),
("gen0.gen1_2.gen2".to_string(), vec![lit_str("monoid")]),
]
.into_iter()
.collect()
);
}
Dependencies
~225–660KB
~16K SLoC