How to use the sphinx.addnodes.desc_parameter function in Sphinx

def userdesc_parse(env, sig, signode):
    x, y = sig.split(':')
    signode += addnodes.desc_name(x, x)
    signode += addnodes.desc_parameterlist()
    signode[-1] += addnodes.desc_parameter(y, y)
    return x

def parse_event(env, sig, signode):
    m = event_sig_re.match(sig)
    if not m:
        signode += addnodes.desc_name(sig, sig)
        return sig
    name, args = m.groups()
    signode += addnodes.desc_name(name, name)
    plist = addnodes.desc_parameterlist()
    for arg in args.split(','):
        arg = arg.strip()
        plist += addnodes.desc_parameter(arg, arg)
    signode += plist
    return name

return False

        arglist = arglist.replace('`', '').replace('\\ ', '') # remove markup
        arglist = [a.strip() for a in arglist.split(",")]

        # has the first argument a type?
        if len(arglist[0].split(" ")) > 1:
            return False

        # This is a function-like macro, it's arguments are typeless!
        signode  += addnodes.desc_name(fullname, fullname)
        paramlist = addnodes.desc_parameterlist()
        signode  += paramlist

        for argname in arglist:
            param = addnodes.desc_parameter('', '', noemph=True)
            # separate by non-breaking space in the output
            param += nodes.emphasis(argname, argname)
            paramlist += param

        return fullname

ends_open = ends_close = 0
            while argument.startswith('['):
                stack.append(addnodes.desc_optional())
                stack[-2] += stack[-1]
                argument = argument[1:].strip()
            while argument.startswith(']'):
                stack.pop()
                argument = argument[1:].strip()
            while argument.endswith(']'):
                ends_close += 1
                argument = argument[:-1].strip()
            while argument.endswith('['):
                ends_open += 1
                argument = argument[:-1].strip()
            if argument:
                stack[-1] += addnodes.desc_parameter(argument, argument)
            while ends_open:
                stack.append(addnodes.desc_optional())
                stack[-2] += stack[-1]
                ends_open -= 1
            while ends_close:
                stack.pop()
                ends_close -= 1
        if len(stack) != 1:
            raise IndexError
    except IndexError:
        # if there are too few or too many elements on the stack, just give up
        # and treat the whole argument list as one argument, discarding the
        # already partially populated paramlist node
        signode += addnodes.desc_parameterlist()
        signode[-1] += addnodes.desc_parameter(arglist, arglist)
    else:

def handle_signature(self, sig, signode):
        method = self.method.upper() + ' '

        signode += addnodes.desc_name(method, method)
        offset = 0
        for match in http_sig_param_re.finditer(sig):
            path = sig[offset:match.start()]
            signode += addnodes.desc_name(path, path)
            params = addnodes.desc_parameterlist()
            typ = match.group('type')
            if typ:
                typ = typ + ': '
                params += addnodes.desc_annotation(typ, typ)
            name = match.group('name')
            params += addnodes.desc_parameter(name, name)
            signode += params
            offset = match.end()
        if offset < len(sig):
            path = sig[offset:len(sig)]
            signode += addnodes.desc_name(path, path)
        fullname = self.method.upper() + ' ' + path

        signode['method'] = self.method
        signode['path'] = sig
        signode['fullname'] = fullname
        return (fullname, self.method, sig)

stack[-1] += addnodes.desc_parameter(argument, argument)
            while ends_open:
                stack.append(addnodes.desc_optional())
                stack[-2] += stack[-1]
                ends_open -= 1
            while ends_close:
                stack.pop()
                ends_close -= 1
        if len(stack) != 1:
            raise IndexError
    except IndexError:
        # if there are too few or too many elements on the stack, just give up
        # and treat the whole argument list as one argument, discarding the
        # already partially populated paramlist node
        paramlist = addnodes.desc_parameterlist()
        paramlist += addnodes.desc_parameter(arglist, arglist)
        signode += paramlist
    else:
        signode += paramlist

def xf(name_node, parameters_node):
        return (
            patch_node(name_node, name_node.astext().strip('_'), ()),
            patch_node(parameters_node, '', [
                SphinxNodes.desc_parameter('', 'self'),
                *parameters_node.children,
            ])

stack[-1] += addnodes.desc_parameter(argument, argument)
            while ends_open:
                stack.append(addnodes.desc_optional())
                stack[-2] += stack[-1]
                ends_open -= 1
            while ends_close:
                stack.pop()
                ends_close -= 1
        if len(stack) != 1:
            raise IndexError
    except IndexError:
        # if there are too few or too many elements on the stack, just give up
        # and treat the whole argument list as one argument, discarding the
        # already partially populated paramlist node
        signode += lua_desc_parameterlist(argstart, argend)
        signode[-1] += addnodes.desc_parameter(arglist, arglist)
    else:
        signode += paramlist

# add commas yay.
                    token_before += token
                    continue
                else:
                    token = token_before + token
                    print 'NOW TOKEN: %r' % token
                    token_before = None
            if token.count('<') != token.count('>'):
                # splitted in the middle of a  declaration :(
                token_before = token
            elif not token or token == ',' or token.isspace():
                pass
            else:
                token = token.strip()
                if ':' in token:
                    stack[-1] += addnodes.desc_parameter('', '', *self._resolve_typeref(token))
                else:
                    stack[-1] += addnodes.desc_parameter(token, token)
        if len(stack) != 1:
            raise ValueError
        if retann:
            ret_nodes = self.state.inline_text(retann, self.lineno)[0]
            signode += addnodes.desc_returns('', '', *self._resolve_typeref(retann))
        return fullname, classname

ends_open = ends_close = 0
            while argument.startswith('['):
                stack.append(addnodes.desc_optional())
                stack[-2] += stack[-1]
                argument = argument[1:].strip()
            while argument.startswith(']'):
                stack.pop()
                argument = argument[1:].strip()
            while argument.endswith(']'):
                ends_close += 1
                argument = argument[:-1].strip()
            while argument.endswith('['):
                ends_open += 1
                argument = argument[:-1].strip()
            if argument:
                stack[-1] += addnodes.desc_parameter(argument, argument)
            while ends_open:
                stack.append(addnodes.desc_optional())
                stack[-2] += stack[-1]
                ends_open -= 1
            while ends_close:
                stack.pop()
                ends_close -= 1
        if len(stack) != 1:
            raise IndexError
    except IndexError:
        # if there are too few or too many elements on the stack, just give up
        # and treat the whole argument list as one argument, discarding the
        # already partially populated paramlist node
        signode += addnodes.desc_parameterlist()
        signode[-1] += addnodes.desc_parameter(arglist, arglist)
    else: