def setup(app):
import sphinx<EOL>from .parser import CommonMarkParser<EOL>if sphinx.version_info >= (<NUM_LIT:1>, <NUM_LIT:8>):<EOL><INDENT>app.add_source_suffix('<STR_LIT>', '<STR_LIT>')<EOL>app.add_source_parser(CommonMarkParser)<EOL><DEDENT>elif sphinx.version_info >= (<NUM_LIT:1>, <NUM_LIT:4>):<EOL><INDENT>app.add_source_parser('<STR_LIT>', CommonMarkParser)<EOL><DEDENT>return {'<STR_LIT:version>': __version__, '<STR_LIT>': True}<EOL>
Initialize Sphinx extension.