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adds AsciiChar::as_str() #104

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adds AsciiChar::as_str() #104

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17 changes: 17 additions & 0 deletions src/ascii_char.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -431,6 +431,18 @@ impl AsciiChar {
self as u8 as char
}

/// Converts an ASCII character into a `&str`.
#[inline]
pub const fn as_str(&self) -> &str {
unsafe {
// SAFETY: Self is repr(u8) so casting *const Self to *const u8 is valid,
// and casting a *const T to *const [T; 1] is always valid (see core::array::from_ref).
let slice = &*(self as *const Self as *const [u8; 1]);
// SAFETY: an ASCII char is always valid UTF-8
core::str::from_utf8_unchecked(slice)
}
}

// the following methods are like ctype, and the implementation is inspired by musl.
// The ascii_ methods take self by reference for maximum compatibility
// with the corresponding methods on u8 and char.
Expand Down Expand Up @@ -999,6 +1011,11 @@ mod tests {
assert_eq!(AsciiChar::A.as_char(), 'A');
}

#[test]
fn as_str() {
assert_eq!(AsciiChar::A.as_str(), "A");
}

#[test]
fn new_array_is_correct() {
for byte in 0..128_u8 {
Expand Down