python - python解析2个已知行之间的文本块

Question

我正在尝试使用 pyparsing 在 2 条已知行之间获取一行行。例如：

ABC
....
DEF

我的python代码：

end = Literal("\n").suppress()
firstLine = Literal("ABC") + SkipTo(end)
secondLine = Literal("DEF") + SkipTo(end)
line = SkipTo(end)
test = firstLine + OneOrMore(line) + secondLine

test.searchString(myText)

--> 但它不起作用。Python只是挂起。谁能告诉我怎么做？

谢谢，

Answer 1

将此调试代码添加到您的程序中：

firstLine.setName("firstLine").setDebug()
line.setName("line").setDebug()
secondLine.setName("secondLine").setDebug()

并将 searchString 更改为 parseString。setDebug() 将在每次尝试匹配表达式时打印出来，如果匹配，则匹配什么，如果不匹配，则异常。使用您的程序，在进行这些更改后，我得到：

Match firstLine at loc 0(1,1)
Matched firstLine -> ['ABC', '.... ']
Match line at loc 11(3,1)
Matched line -> ['DEF ']
Match line at loc 15(3,1)
Exception raised:Expected line (at char 17), (line:4, col:2)
Match secondLine at loc 15(3,1)
Exception raised:Expected "DEF" (at char 16), (line:4, col:1)
Traceback (most recent call last):
  File "rrrr.py", line 19, in <module>
    test.parseString(myText) 
  File "C:\Python25\lib\site-packages\pyparsing-1.5.5-py...
    raise exc
pyparsing.ParseException: Expected "DEF" (at char 16), (line:4, col:1)

可能不是你所期望的。

Answer 2

我终于找到了我的问题的答案。

end = Literal("\n").suppress()
firstLine = Literal("ABC") + SkipTo(end)
secondLine = Literal("DEF") + SkipTo(end)
line = ~secondLine + SkipTo(end)
test = firstLine + OneOrMore(line) + secondLine

test.searchString(myText)

这对我行得通。