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, determines how many bytes are in this UTF-8 character. If the UTF-8 character is invalid, returns 0, otherwise returns 1 ~ 4,
• get_width_assume_valid^⚠
  Assume the input first byte is from a valid UTF-8 character. Given a first byte, determines how many bytes are in this UTF-8 character. It returns 1 ~ 4,
• is_width_0
• is_width_1
• is_width_2
• is_width_3
• is_width_4