blFunction.py 文件源码

def extract_from_part(self,parsed):
        from_seen = False
        for item in parsed.tokens:
            if from_seen:
                if self.is_subselect(item):
                    for x in self.extract_from_part(item):
                        yield x
                elif item.ttype is Keyword:
                    raise StopIteration
                else:
                    yield item
            elif item.ttype is Keyword and item.value.upper() == 'FROM':
                from_seen = True