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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def parse(self, debug=False):
 """Returns parsed text"""

        if self._parsed is None:
            try:
                if self._mode == "html":
                    self._parsed = self.html(self._content, self._show_everything, self._translation)
                else:
                    self._parsed = self.rst(self._content, self._show_everything, self._translation, debug=debug)
            except Exception as e:
                if debug:
                    raise BaseException("Parsing failed") from e
                else:
                    self._parsed = self._translation.gettext("<b>Parsing failed</b>: <pre>{}</pre>").format(html.escape(self._content))
        return self._parsed