Method tryInterpretLength

lib/Epub/Epub/css/CssParser.cpp:268–304

}

bool CssParser::tryInterpretLength(std::string_view val, CssLength& out) {
  val = trimCssWhitespace(val);
  if (val.empty()) {
    out = CssLength{};
    return false;
  }

  size_t unitStart = val.size();
  for (size_t i = 0; i < val.size(); ++i) {
    const char c = val[i];
    if (!std::isdigit(c) && c != '.' && c != '-' && c != '+') {
      unitStart = i;
      break;
    }
  }

  float numericValue;
  if (!tryParseNumber(val.substr(0, unitStart), numericValue)) {
    out = CssLength{};
    return false;  // No number parsed (e.g. auto, inherit, initial)
  }

  const std::string_view unitPart = val.substr(unitStart);
  auto unit = CssUnit::Pixels;
  if (iequalsAscii(unitPart, "em")) {
    unit = CssUnit::Em;
  } else if (iequalsAscii(unitPart, "rem")) {
    unit = CssUnit::Rem;
  } else if (iequalsAscii(unitPart, "pt")) {
    unit = CssUnit::Points;
  } else if (unitPart == "%") {
    unit = CssUnit::Percent;
  }

  out = CssLength{numericValue, unit};
  return true;
}

// Declaration parsing