1#[must_use]
2pub fn is_field_name(text: &str) -> bool {
3 !text.is_empty()
4 && text
5 .bytes()
6 .all(|byte| byte.is_ascii_alphanumeric() || byte == b'_')
7}
8
9#[cfg(test)]
10mod tests {
11 use super::*;
12
13 #[test]
14 fn a_field_name_is_ascii_letters_digits_and_underscores() {
15 for accepted in ["name", "line_2", "_", "A1"] {
16 assert!(is_field_name(accepted), "{accepted}");
17 }
18 for refused in ["", "a-b", "a.b", "a b", "a[0]", "รค"] {
19 assert!(!is_field_name(refused), "{refused}");
20 }
21 }
22}