/
index.js
42 lines (31 loc) · 851 Bytes
/
index.js
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import stripAnsi from 'strip-ansi';
import isFullwidthCodePoint from 'is-fullwidth-code-point';
import emojiRegex from 'emoji-regex';
export default function stringWidth(string) {
if (typeof string !== 'string' || string.length === 0) {
return 0;
}
string = stripAnsi(string);
if (string.length === 0) {
return 0;
}
string = string.replace(emojiRegex(), ' ');
let width = 0;
for (let index = 0; index < string.length; index++) {
const codePoint = string.codePointAt(index);
// Ignore control characters
if (codePoint <= 0x1F || (codePoint >= 0x7F && codePoint <= 0x9F)) {
continue;
}
// Ignore combining characters
if (codePoint >= 0x300 && codePoint <= 0x36F) {
continue;
}
// Surrogates
if (codePoint > 0xFFFF) {
index++;
}
width += isFullwidthCodePoint(codePoint) ? 2 : 1;
}
return width;
}