@contextmanager<EOL><INDENT>def depth(self):<DEDENT>
if self.indentation is None:<EOL><INDENT>yield<EOL><DEDENT>else:<EOL><INDENT>previous = self.previous_indent<EOL>self.previous_indent = self.indent<EOL>self.indent += self.indentation<EOL>yield<EOL>self.indent = self.previous_indent<EOL>self.previous_indent = previous<EOL><DEDENT>
Increase the level of indentation by one.