'use strict';
|
const stripAnsi = require('strip-ansi');
|
const isFullwidthCodePoint = require('is-fullwidth-code-point');
|
const emojiRegex = require('emoji-regex');
|
|
const 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 i = 0; i < string.length; i++) {
|
const code = string.codePointAt(i);
|
|
// Ignore control characters
|
if (code <= 0x1F || (code >= 0x7F && code <= 0x9F)) {
|
continue;
|
}
|
|
// Ignore combining characters
|
if (code >= 0x300 && code <= 0x36F) {
|
continue;
|
}
|
|
// Surrogates
|
if (code > 0xFFFF) {
|
i++;
|
}
|
|
width += isFullwidthCodePoint(code) ? 2 : 1;
|
}
|
|
return width;
|
};
|
|
module.exports = stringWidth;
|
// TODO: remove this in the next major version
|
module.exports.default = stringWidth;
|
