code: protected StyleSheet parseAndImport(Object source, NetworkProcessor network, String encoding, SourceType type,
                                          StyleSheet sheet, Preparator preparator, URL base, List<MediaQuery> media)
              throws CSSException, IOException {
          CSSParser parser = createParser(source, network, encoding, type, base);
          CSSParserExtractor extractor = parse(parser, type, preparator, media);
  
          for (int i = 0; i < extractor.getImportPaths().size(); i++) {
              String path = extractor.getImportPaths().get(i);
              List<MediaQuery> imedia = extractor.getImportMedia().get(i);
  
              if (((imedia == null || imedia.isEmpty()) && CSSFactory.getAutoImportMedia().matchesEmpty()) //no media query specified
                      || CSSFactory.getAutoImportMedia().matchesOneOf(imedia)) //or some media query matches to the autoload media spec
              {
                  URL url = DataURLHandler.createURL(base, path);
                  try {
                      parseAndImport(url, network, encoding, SourceType.URL, sheet, preparator, url, imedia);
                  } catch (IOException e) {
                      log.warn("Couldn't read imported style sheet: {}", e.getMessage());
                  }
              } else
                  log.trace("Skipping import {} (media not matching)", path);
          }
  
          return addRulesToStyleSheet(extractor.getRules(), sheet);
      }
docs: Parses the source using the given infrastructure and returns the resulting style sheet.
  The imports are handled recursively.