Method operator()

src/tsutil/ts_unit_parser.cc:33–65

{

auto
UnitParser::operator()(swoc::TextView const &src) const noexcept -> Rv<value_type>
{
  value_type zret = 0;
  TextView   text = src; // Keep @a src around to report error offsets.

  while (text.ltrim_if(&isspace)) {
    TextView parsed;
    auto     n = swoc::svtou(text, &parsed);
    if (parsed.empty()) {
      return Errata("Required count not found at offset {}", text.data() - src.data());
    } else if (n == std::numeric_limits<decltype(n)>::max()) {
      return Errata("Count at offset {} was out of bounds", text.data() - src.data());
    }
    text.remove_prefix(parsed.size());
    auto ptr = text.ltrim_if(&isspace).data(); // save for error reporting.
    // Everything up to the next digit or whitespace.
    auto unit = text.clip_prefix_of([](char c) { return !(isspace(c) || isdigit(c)); });
    if (unit.empty()) {
      if (_unit_required_p) {
        return Errata("Required unit not found at offset {}", ptr - src.data());
      }
    } else {
      auto mult = _units[unit]; // What's the multiplier?
      if (mult == 0) {
        return Errata("Unknown unit \"{}\" at offset {}", unit, ptr - src.data());
      }
      n *= mult;
    }
    zret += n;
  }
  return zret;
}

// Concrete unit parsers.