Crate utf8_width

UTF-8 Width

To determine the width of a UTF-8 character by providing its first byte.

References: https://tools.ietf.org/html/rfc3629

Examples

assert_eq!(1, utf8_width::get_width(b'1'));
assert_eq!(3, utf8_width::get_width("中".as_bytes()[0]));

Benchmark

cargo bench

Constants

MAX_0_1

MAX_0_2

MAX_1

MAX_2

MAX_3

MAX_4

MIN_0_1

MIN_0_2

MIN_1

MIN_2

MIN_3

MIN_4

Functions

get_width

Given a first byte, determine how many bytes are in this UTF-8 character. If the UTF-8 character is invalid, return 0; otherwise, return 1 to 4.

get_width_assume_valid^⚠

Assuming the input first byte is from a valid UTF-8 character, determine how many bytes are in this UTF-8 character. It returns 1 to 4.

is_width_0

is_width_1

is_width_2

is_width_3

is_width_4