Expand description
tinystr is a utility crate of the ICU4X project.
It includes TinyAsciiStr, a core API for representing small ASCII-only bounded length strings.
It is optimized for operations on strings of size 8 or smaller. When use cases involve comparison
and conversion of strings for lowercase/uppercase/titlecase, or checking
numeric/alphabetic/alphanumeric, TinyAsciiStr is the edge performance library.
Examples
use tinystr::TinyAsciiStr;
let s1: TinyAsciiStr<4> = "tEsT".parse().expect("Failed to parse.");
assert_eq!(s1, "tEsT");
assert_eq!(s1.to_ascii_uppercase(), "TEST");
assert_eq!(s1.to_ascii_lowercase(), "test");
assert_eq!(s1.to_ascii_titlecase(), "Test");
assert_eq!(s1.is_ascii_alphanumeric(), true);
assert_eq!(s1.is_ascii_numeric(), false);
let s2 = TinyAsciiStr::<8>::try_from_raw(*b"New York")
.expect("Failed to parse.");
assert_eq!(s2, "New York");
assert_eq!(s2.to_ascii_uppercase(), "NEW YORK");
assert_eq!(s2.to_ascii_lowercase(), "new york");
assert_eq!(s2.to_ascii_titlecase(), "New york");
assert_eq!(s2.is_ascii_alphanumeric(), false);Details
When strings are of size 8 or smaller, the struct transforms the strings as u32/u64 and uses
bitmasking to provide basic string manipulation operations:
is_ascii_numericis_ascii_alphabeticis_ascii_alphanumericto_ascii_lowercaseto_ascii_uppercaseto_ascii_titlecasePartialEq
TinyAsciiStr will fall back to u8 character manipulation for strings of length greater than 8.