以逗号分隔字符串，但在括号环境中除外 [英] Split string at commas except when in bracket environment

问题描述

我想用逗号分隔Python多行字符串，除非逗号在方括号内.例如字符串

I would like to split a Python multiline string at its commas, except when the commas are inside a bracketed expression. E.g., the string

{J. Doe, R. Starr}, {Lorem
{i}psum dolor }, Dol. sit., am. et.

应分为

['{J. Doe, R. Starr}', '{Lorem\n{i}psum dolor }', 'Dol. sit.', 'am. et.']

这涉及到括号匹配，因此正则表达式可能在这里没有帮助. PyParsing 具有)环境是受保护的，而不是{}分隔的环境.

This involves bracket matching, so probably regexes are not helping out here. PyParsing has commaSeparatedList which almost does what I need except that quoted (") environments are protected instead of {}-delimited ones.

有任何提示吗?

推荐答案

编写您自己的自定义拆分功能:

Write your own custom split-function:

 input_string = """{J. Doe, R. Starr}, {Lorem
 {i}psum dolor }, Dol. sit., am. et."""


 expected = ['{J. Doe, R. Starr}', '{Lorem\n{i}psum dolor }', 'Dol. sit.', 'am. et.']

 def split(s):
     parts = []
     bracket_level = 0
     current = []
     # trick to remove special-case of trailing chars
     for c in (s + ","):
         if c == "," and bracket_level == 0:
             parts.append("".join(current))
             current = []
         else:
             if c == "{":
                 bracket_level += 1
             elif c == "}":
                 bracket_level -= 1
             current.append(c)
     return parts

 assert split(input_string), expected

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