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- 'use strict';
- var stripAnsi = require('strip-ansi');
- var codePointAt = require('code-point-at');
- var isFullwidthCodePoint = require('is-fullwidth-code-point');
- module.exports = function (str) {
- if (typeof str !== 'string' || str.length === 0) {
- return 0;
- }
- var width = 0;
- str = stripAnsi(str);
- for (var i = 0; i < str.length; i++) {
- var code = codePointAt(str, i);
-
- if (code <= 0x1f || (code >= 0x7f && code <= 0x9f)) {
- continue;
- }
-
- if (code >= 0x10000) {
- i++;
- }
- if (isFullwidthCodePoint(code)) {
- width += 2;
- } else {
- width++;
- }
- }
- return width;
- };
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