python - 比循环和调用循环调用另一个函数的函数更好的方法

Question

我有一个消息(字符串)，它由事务组成，组由元素<组成/strong>.

我有比循环和调用函数更好的方法来解析这样的消息，循环并调用另一个函数 循环并调用另一个函数因为我发现以下内容很愚蠢:

class Parser:
  def parse_msg(self, msg):
    trans = re.findall(trans_pattern, msg)
    for t in trans:
      self.parse_trans(t)

  def parse_trans(self, trans):
    groups = re.findall(groups_pattern, trans)
    for g in groups:
      self.parse_group(g)

  def parse_group(self, group):
    elements = re.findall(element_pattern, group)
    for e in elements:
      self.parse_element(e)

  def parse_element(self, e):
    pass

有没有更好的方法/设计模式可以解决这个问题？

Answer 1

嗯，我想有几种可能性。您可以具有如下结构:

import re

GRAMMAR = (
    trans_pattern, (
        groups_pattern, (
            element_pattern, None
        )
    )
)

def parse_message(msg):
    parse_message_rec(msg, GRAMMAR)

def parse_message_rec(msg, grammar):
    if grammar is None:
        # Leaf element
        return
    pattern, next_grammar = grammar
    children = re.findall(pattern, msg)
    for child in children:
        parse_message_rec(child, next_grammar)