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'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;