static std::string Unescape()

in tools/worker/swift_runner.cc [57:93]

• 29 lines of code
• 11 McCabe index (conditional complexity)

static std::string Unescape(const std::string &arg) {
  std::string result;
  auto length = arg.size();
  for (size_t i = 0; i < length; ++i) {
    auto ch = arg[i];

    // If it's a backslash, consume it and append the character that follows.
    if (ch == '\\' && i + 1 < length) {
      ++i;
      result.push_back(arg[i]);
      continue;
    }

    // If it's a quote, process everything up to the matching quote, unescaping
    // backslashed characters as needed.
    if (ch == '"' || ch == '\'') {
      auto quote = ch;
      ++i;
      while (i != length && arg[i] != quote) {
        if (arg[i] == '\\' && i + 1 < length) {
          ++i;
        }
        result.push_back(arg[i]);
        ++i;
      }
      if (i == length) {
        break;
      }
      continue;
    }

    // It's a regular character.
    result.push_back(ch);
  }

  return result;
}