string-visual-width

Get the visual width of the string

Why

Because of the combination of Unicode and Emoji characters, it is difficult to calculate the actual display width of a string in Terminal applciation. Strictly speaking there is no universal method to do that.

I try to figure it out in accordance with the following steps:

• Strip out all ansi codes in string.
• Nomalize unocide character before calculation, n\u0303 becomes ñ.
• Use @nxmix/emoji-seq-match to match joined Emoji characters as long as possible and calculate their width as 2.
• Use @nxmix/is-full-width determine which characters should be treated as East Asian characters and count a width of 2.

Usage

Install

npm i @nxmix/string-visual-width --save

Typescript definition file is already included.

Examples

const width = require('@nxmix/string-visual-width').default;

width('中');
//=> 2

width("👩‍👦");
//=> 2

import getMatchedLength from '@nxmix/string-visual-width';

width('中');
//=> 2

Author

Rong Shen