1 /// True values are `y`, `yes`, `t`, `true`, `on`, and `1`.
2 pub(crate) const TRUE_LITERALS: [&str; 6] = ["y", "yes", "t", "true", "on", "1"];
3 
4 /// False values are `n`, `no`, `f`, `false`, `off`, and `0`.
5 pub(crate) const FALSE_LITERALS: [&str; 6] = ["n", "no", "f", "false", "off", "0"];
6 
7 /// Converts a string literal representation of truth to true or false.
8 ///
9 /// `false` values are `n`, `no`, `f`, `false`, `off`, and `0` (case insensitive).
10 ///
11 /// Any other value will be considered as `true`.
12 pub(crate) fn str_to_bool(val: impl AsRef<str>) -> Option<bool> {
13     let pat: &str = &val.as_ref().to_lowercase();
14     if TRUE_LITERALS.contains(&pat) {
15         Some(true)
16     } else if FALSE_LITERALS.contains(&pat) {
17         Some(false)
18     } else {
19         None
20     }
21 }
22