diff options
Diffstat (limited to 'users/tazjin')
-rw-r--r-- | users/tazjin/german-string/src/lib.rs | 68 |
1 files changed, 67 insertions, 1 deletions
diff --git a/users/tazjin/german-string/src/lib.rs b/users/tazjin/german-string/src/lib.rs index 813cd5b1e515..9aca9c72b8e9 100644 --- a/users/tazjin/german-string/src/lib.rs +++ b/users/tazjin/german-string/src/lib.rs @@ -66,11 +66,23 @@ impl GermanString { } } - fn len(&self) -> usize { + pub fn len(&self) -> usize { // SAFETY: The length field is located in the same location for both // variants, reading it from either is safe. unsafe { self.0.small.len as usize } } + + pub fn as_bytes(&self) -> &[u8] { + if self.len() > 12 { + unsafe { std::slice::from_raw_parts(self.0.large.data, self.len()) } + } else { + unsafe { &self.0.small.data.as_ref()[..self.len()] } + } + } + + pub fn as_str(&self) -> Result<&str, std::str::Utf8Error> { + std::str::from_utf8(self.as_bytes()) + } } impl Drop for GermanString { @@ -83,3 +95,57 @@ impl Drop for GermanString { } } } + +#[cfg(test)] +mod tests { + use super::*; + + #[test] + fn test_empty_string() { + let empty = GermanString::new_transient(b""); + + assert_eq!(empty.len(), 0, "empty string should be empty"); + assert_eq!(empty.as_bytes(), b"", "empty string should contain nothing"); + assert_eq!( + empty.as_str().expect("empty string is valid UTF-8"), + "", + "empty string should contain empty string" + ); + } + + #[test] + fn test_short_string() { + let short = GermanString::new_transient(b"meow"); + + assert_eq!(short.len(), 4, "'meow' is four characters"); + assert_eq!( + short.as_bytes(), + b"meow", + "short string returns correct bytes" + ); + assert_eq!( + short.as_str().expect("'meow' is valid UTF-8"), + "meow", + "short string returns correct string" + ); + } + + #[test] + fn test_long_string() { + let input: &str = "This code was written at https://signal.live"; + let long = GermanString::new_transient(input.as_bytes()); + + assert_eq!(long.len(), 44, "long string has correct length"); + assert_eq!( + long.as_bytes(), + input.as_bytes(), + "long string returns correct bytes" + ); + + assert_eq!( + long.as_str().expect("input is valid UTF-8"), + input, + "long string returns correct string" + ); + } +} |