How to use the pcpp.preprocessor.Action function in pcpp

def on_directive_handle(self,directive,toks,ifpassthru,precedingtoks):
        if ifpassthru:
            if directive.value == 'if' or directive.value == 'elif' or directive == 'else' or directive.value == 'endif':
                self.bypass_ifpassthru = len([tok for tok in toks if tok.value == '__PCPP_ALWAYS_FALSE__' or tok.value == '__PCPP_ALWAYS_TRUE__']) > 0
            if not self.bypass_ifpassthru and (directive.value == 'define' or directive.value == 'undef'):
                if toks[0].value != self.potential_include_guard:
                    raise OutputDirective(Action.IgnoreAndPassThrough)  # Don't execute anything with effects when inside an #if expr with undefined macro
        if (directive.value == 'define' or directive.value == 'undef') and self.args.nevers:
            if toks[0].value in self.args.nevers:
                raise OutputDirective(Action.IgnoreAndPassThrough)
        if self.args.passthru_defines:
            super(CmdPreprocessor, self).on_directive_handle(directive,toks,ifpassthru,precedingtoks)
            return None  # Pass through where possible
        return super(CmdPreprocessor, self).on_directive_handle(directive,toks,ifpassthru,precedingtoks)

chunk = []
                            self.undef(args)
                            if handling is None:
                                for tok in x:
                                    yield tok
                    elif name == 'ifdef':
                        at_front_of_file = False
                        ifstack.append(ifstackentry(enable,iftrigger,ifpassthru,x))
                        if enable:
                            ifpassthru = False
                            if not args[0].value in self.macros:
                                res = self.on_unknown_macro_in_defined_expr(args[0])
                                if res is None:
                                    ifpassthru = True
                                    ifstack[-1].rewritten = True
                                    raise OutputDirective(Action.IgnoreAndPassThrough)
                                elif res is True:
                                    iftrigger = True
                                else:
                                    enable = False
                                    iftrigger = False
                            else:
                                iftrigger = True
                    elif name == 'ifndef':
                        if not ifstack and at_front_of_file:
                            self.on_potential_include_guard(args[0].value)
                            include_guard = (args[0].value, 0)
                        at_front_of_file = False
                        ifstack.append(ifstackentry(enable,iftrigger,ifpassthru,x))
                        if enable:
                            ifpassthru = False
                            if args[0].value in self.macros: