How to use the pygmsh.built_in.plane_surface.PlaneSurface function in pygmsh

def add_plane_surface(self, *args, **kwargs):
        p = PlaneSurface(*args, **kwargs)
        self._GMSH_CODE.append(p.code)
        return p

def set_transfinite_surface(self, surface, size=None, orientation=None):
        assert surface.num_edges == 4, "a transfinite surface can only have 4 sides"
        # size is not mandatory because in general a user can create it's own
        # transfinite lines and then just tell gmsh that the surface is
        # transfinite too
        if size is not None:
            assert isinstance(
                surface, (PlaneSurface, Surface, self.Polygon)
            ), "we can create transfinite lines only if we have a line loop"
            self.set_transfinite_lines(
                [surface.line_loop.lines[0], surface.line_loop.lines[2]], size[0]
            )
            self.set_transfinite_lines(
                [surface.line_loop.lines[1], surface.line_loop.lines[3]], size[1]
            )
        code = f"Transfinite Surface {{{surface.id}}}"
        if orientation is not None:
            code += " " + orientation
        self._GMSH_CODE.append(code + ";")
        return