AutoIt脚本的反编译和代码格式化问题分析

#!/usr/bin/env python2.7
#-*- coding: utf-8 -*-
 
_AU3 = ';./sample.au3';
_AU3_OUT = ';./format.au3';
_INDENT = '; '; * 4
 
def au3formater(line, indent):
  line = line.strip().lower()
  
  next_indent = indent
  if (line.startswith(';end';) or
    line.startswith(';until';) or 
    line in (';next';, ';wend';)):
    indent -= 1
    next_indent -= 1
  elif line.startswith(';if';) and line.endswith(';then';):
    next_indent += 1
  elif (line.startswith(';func';) or 
     line.startswith(';for';) or 
     line.startswith(';select';) or
     line.startswith(';switch';) or
     line.startswith(';while';) or
     line == ';do';):
    next_indent += 1
  elif line.startswith(';else';) or line.startswith(';case';):
    indent -= 1
  new_line = _INDENT * indent + line
  
  return new_line, next_indent
 
def main():
  with open(_AU3, ';r';) as fp:
    with open(_AU3_OUT, ';w';) as fpw:
      indent = 0
      line = fp.readline()
      while line:
        new_line, indent = au3formater(line, indent)
        fpw.write(';%s\n'; % new_line)
        line = fp.readline()
 
if __name__ == ';__main__';:
  main()