2 const isFullwidthCodePoint = require('is-fullwidth-code-point');
3 const astralRegex = require('astral-regex');
4 const ansiStyles = require('ansi-styles');
13 const wrapAnsi = code => `${ESCAPES[0]}[${code}m`;
15 module.exports = (str, begin, end) => {
16 const arr = [...str.normalize()];
18 end = typeof end === 'number' ? end : arr.length;
20 let insideEscape = false;
21 let escapeCode = null;
25 for (const [i, x] of arr.entries()) {
26 let leftEscape = false;
28 if (ESCAPES.includes(x)) {
30 const code = /\d[^m]*/.exec(str.slice(i, i + 18));
31 escapeCode = code === END_CODE ? null : code;
32 } else if (insideEscape && x === 'm') {
37 if (!insideEscape && !leftEscape) {
41 if (!astralRegex({exact: true}).test(x) && isFullwidthCodePoint(x.codePointAt())) {
45 if (visible > begin && visible <= end) {
47 } else if (visible === begin && !insideEscape && escapeCode !== null && escapeCode !== END_CODE) {
48 output += wrapAnsi(escapeCode);
49 } else if (visible >= end) {
50 if (escapeCode !== null) {
51 output += wrapAnsi(ansiStyles.codes.get(parseInt(escapeCode, 10)) || END_CODE);