Method _transform_doc

pandas/io/formats/xml.py:528–566

Parse stylesheet from file or buffer and run it. This method will parse stylesheet object into tree for parsing conditionally by its specific object type, then transforms original tree with XSLT script.

(self)

        return SubElement

    def _transform_doc(self) -> bytes:
        """
        Parse stylesheet from file or buffer and run it.

        This method will parse stylesheet object into tree for parsing
        conditionally by its specific object type, then transforms
        original tree with XSLT script.
        """
        from lxml.etree import (
            XSLT,
            XMLParser,
            fromstring,
            parse,
        )

        style_doc = self.stylesheet
        assert style_doc is not None  # is ensured by caller

        handle_data = get_data_from_filepath(
            filepath_or_buffer=style_doc,
            encoding=self.encoding,
            compression=self.compression,
            storage_options=self.storage_options,
        )

        with handle_data as xml_data:
            curr_parser = XMLParser(encoding=self.encoding)

            if isinstance(xml_data, io.StringIO):
                xsl_doc = fromstring(
                    xml_data.getvalue().encode(self.encoding), parser=curr_parser
                )
            else:
                xsl_doc = parse(xml_data, parser=curr_parser)

        transformer = XSLT(xsl_doc)
        new_doc = transformer(self.root)

        return bytes(new_doc)