code: def parse(self, src):
          
  
          self.cssBuilder.beginStylesheet()
          try:
  
              # XXX Some simple preprocessing
              src = cssSpecial.cleanupCSS(src)
  
              try:
                  src, stylesheet = self._parseStylesheet(src)
              except self.ParseError as err:
                  err.setFullCSSSource(src)
                  raise
          finally:
              self.cssBuilder.endStylesheet()
          return stylesheet
docs: Parses CSS string source using the current cssBuilder.
          Use for embedded stylesheets.