Method loadFromStream

lib/Epub/Epub/css/CssParser.cpp:488–629

// Main parsing entry point

bool CssParser::loadFromStream(HalFile& source) {
  if (!source) {
    LOG_ERR("CSS", "Cannot read from invalid file");
    return false;
  }

  size_t totalRead = 0;

  // Use stack-allocated buffers for parsing to avoid heap reallocations
  StackBuffer selector;
  StackBuffer declBuffer;

  bool inComment = false;
  bool maybeSlash = false;
  bool prevStar = false;

  bool inAtRule = false;
  int atDepth = 0;

  int bodyDepth = 0;
  bool skippingRule = false;
  CssStyle currentStyle;

  auto handleChar = [&](const char c) {
    if (inAtRule) {
      if (c == '{') {
        ++atDepth;
      } else if (c == '}') {
        if (atDepth > 0) --atDepth;
        if (atDepth == 0) inAtRule = false;
      } else if (c == ';' && atDepth == 0) {
        inAtRule = false;
      }
      return;
    }

    if (bodyDepth == 0) {
      if (selector.empty() && isCssWhitespace(c)) {
        return;
      }
      if (c == '@' && selector.empty()) {
        inAtRule = true;
        atDepth = 0;
        return;
      }
      if (c == '{') {
        bodyDepth = 1;
        currentStyle = CssStyle{};
        declBuffer.clear();
        if (selector.size() > MAX_SELECTOR_LENGTH * 4) {
          skippingRule = true;
        }
        return;
      }
      selector.push_back(c);
      return;
    }