Function unescape

src/utils.js:210–256

(str)

const CONTAINS_ESCAPE = /\\/;

function unescape(str) {
  const needToProcess = CONTAINS_ESCAPE.test(str);

  if (!needToProcess) {
    return str;
  }

  let ret = "";

  for (let i = 0; i < str.length; i++) {
    if (str[i] === "\\") {
      const gobbled = gobbleHex(str.slice(i + 1, i + 7));

      // eslint-disable-next-line no-undefined
      if (gobbled !== undefined) {
        ret += gobbled[0];
        i += gobbled[1];

        // eslint-disable-next-line no-continue
        continue;
      }

      // Retain a pair of \\ if double escaped `\\\\`
      // https://github.com/postcss/postcss-selector-parser/commit/268c9a7656fb53f543dc620aa5b73a30ec3ff20e
      if (str[i + 1] === "\\") {
        ret += "\\";
        i += 1;

        // eslint-disable-next-line no-continue
        continue;
      }

      // if \\ is at the end of the string retain it
      // https://github.com/postcss/postcss-selector-parser/commit/01a6b346e3612ce1ab20219acc26abdc259ccefb
      if (str.length === i + 1) {
        ret += str[i];
      }

      // eslint-disable-next-line no-continue
      continue;
    }

    ret += str[i];
  }

  return ret;
}

function normalizePath(file) {
  return path.sep === "\\" ? file.replace(/\\/g, "/") : file;