Reimplements the :meth:`AbstractHighlighter.highlightBlock` method.

        :param block: Text block.
        :type block: QString

def highlightBlock(self, block):
        """
        Reimplements the :meth:`AbstractHighlighter.highlightBlock` method.

        :param block: Text block.
        :type block: QString
        """

        self.highlight_text(block, 0, len(block))
        self.setCurrentBlockState(0)

        state = 1
        for rule in self.rules:
            if re.match("comment\.block\.[\w\.]*start", rule.name):
                format = self.formats.get_format(rule.name) or self.formats.get_format("default")
                if self.highlight_multiline_block(block, rule.pattern,
                                                  foundations.common.get_first_item([item for item in self.rules
                                                                                     if item.name == rule.name.replace(
                                                              "start", "end")]).pattern, state, format):
                    break
                state += 1