tinystr/
macros.rs

1// This file is part of ICU4X. For terms of use, please see the file
2// called LICENSE at the top level of the ICU4X source tree
3// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).
4
5#[macro_export]
6macro_rules! tinystr {
7    ($n:literal, $s:literal) => {{
8        // Force it into a const context; otherwise it may get evaluated at runtime instead.
9        const TINYSTR_MACRO_CONST: $crate::TinyAsciiStr<$n> = {
10            match $crate::TinyAsciiStr::from_bytes($s.as_bytes()) {
11                Ok(s) => s,
12                // We are okay with panicking here because this is in a const context
13                #[allow(clippy::panic)]
14                // Cannot format the error since formatting isn't const yet
15                Err(_) => panic!(concat!("Failed to construct tinystr from ", $s)),
16            }
17        };
18        TINYSTR_MACRO_CONST
19    }};
20}
21
22#[cfg(test)]
23mod tests {
24    #[test]
25    fn test_macro_construction() {
26        let s1 = tinystr!(8, "foobar");
27        assert_eq!(&*s1, "foobar");
28
29        let s1 = tinystr!(12, "foobarbaz");
30        assert_eq!(&*s1, "foobarbaz");
31    }
32}