unicode-width

Determine displayed width of char and str types according to Unicode Standard Annex #11, other portions of the Unicode standard, and common implementations of POSIX wcwidth().

This crate is #![no_std].

use unicode_width::UnicodeWidthStr;

fn main() {
    let teststr = "Ｈｅｌｌｏ, ｗｏｒｌｄ!";
    let width = UnicodeWidthStr::width(teststr);
    println!("{}", teststr);
    println!("The above string is {} columns wide.", width);
    let width = teststr.width_cjk();
    println!("The above string is {} columns wide (CJK).", width);
}

NOTE: The computed width values may not match the actual rendered column width. For example, the woman scientist emoji comprises of a woman emoji, a zero-width joiner and a microscope emoji. Such emoji ZWJ sequences are considered to have the sum of the widths of their constituent parts:

extern crate unicode_width;
use unicode_width::UnicodeWidthStr;

fn main() {
    assert_eq!(UnicodeWidthStr::width("👩"), 2); // Woman
    assert_eq!(UnicodeWidthStr::width("🔬"), 2); // Microscope
    assert_eq!(UnicodeWidthStr::width("👩‍🔬"), 4); // Woman scientist
}

Additionally, defective combining character sequences and nonstandard Korean jamo sequences may be rendered with a different width than what this crate says. (This is not an exhaustive list.)

crates.io

You can use this package in your project by adding the following to your Cargo.toml:

[dependencies]
unicode-width = "0.1.11"