lepu-test-platform-web/node_modules/slice-ansi/index.js

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'use strict';
const isFullwidthCodePoint = require('is-fullwidth-code-point');
const astralRegex = require('astral-regex');
const ansiStyles = require('ansi-styles');
const ESCAPES = [
'\u001B',
'\u009B'
];
const END_CODE = 39;
const wrapAnsi = code => `${ESCAPES[0]}[${code}m`;
module.exports = (str, begin, end) => {
const arr = [...str.normalize()];
end = typeof end === 'number' ? end : arr.length;
let insideEscape = false;
let escapeCode = null;
let visible = 0;
let output = '';
for (const [i, x] of arr.entries()) {
let leftEscape = false;
if (ESCAPES.includes(x)) {
insideEscape = true;
const code = /\d[^m]*/.exec(str.slice(i, i + 18));
escapeCode = code === END_CODE ? null : code;
} else if (insideEscape && x === 'm') {
insideEscape = false;
leftEscape = true;
}
if (!insideEscape && !leftEscape) {
++visible;
}
if (!astralRegex({exact: true}).test(x) && isFullwidthCodePoint(x.codePointAt())) {
++visible;
}
if (visible > begin && visible <= end) {
output += x;
} else if (visible === begin && !insideEscape && escapeCode !== null && escapeCode !== END_CODE) {
output += wrapAnsi(escapeCode);
} else if (visible >= end) {
if (escapeCode !== null) {
output += wrapAnsi(ansiStyles.codes.get(parseInt(escapeCode, 10)) || END_CODE);
}
break;
}
}
return output;
};