parameters: (self, port_class, designation)
return_statement: return Port.wrap(self,
                           plugin_get_port_by_designation(self.plugin,
                                                          port_class.node,
                                                          designation.node))
docstring: Get a port on `plugin` by its lv2:designation.
  
          The designation of a port describes the meaning, assignment, allocation or
          role of the port, e.g. "left channel" or "gain".  If found, the port with
          matching `port_class` and `designation` is be returned, otherwise None is
          returned.  The `port_class` can be used to distinguish the input and output
          ports for a particular designation.  If `port_class` is None, any port with
          the given designation will be returned.
docstring_summary: Get a port on `plugin` by its lv2:designation.
docstring_tokens: Get a port on plugin by its lv2 : designation .
function: def get_port_by_designation(self, port_class, designation):
          """Get a port on `plugin` by its lv2:designation.
  
          The designation of a port describes the meaning, assignment, allocation or
          role of the port, e.g. "left channel" or "gain".  If found, the port with
          matching `port_class` and `designation` is be returned, otherwise None is
          returned.  The `port_class` can be used to distinguish the input and output
          ports for a particular designation.  If `port_class` is None, any port with
          the given designation will be returned.
          """
          return Port.wrap(self,
                           plugin_get_port_by_designation(self.plugin,
                                                          port_class.node,
                                                          designation.node))
function_tokens: def get_port_by_designation ( self , port_class , designation ) : return Port . wrap ( self , plugin_get_port_by_designation ( self . plugin , port_class . node , designation . node ) )