在红宝石例外中捕捉行号 [英] Catching line numbers in ruby exceptions

问题描述

考虑以下ruby代码

test.rb：

begin

  puts
  thisFunctionDoesNotExist
  x = 1+1
rescue Exception => e
  p e
end

为了进行调试，我想要救援块知道该文件的第4行出现错误。有没有干净的方法？

For debugging purposes, I would like the rescue block to know that the error occurred in line 4 of this file. Is there a clean way of doing that?

推荐答案

p e.backtrace 

我运行在没有来源的IRB会话上，它仍然提供相关信息。

I ran it on an IRB session which has no source and it still gave relevant info.

=> ["(irb):11:in `foo'", 
    "(irb):17:in `irb_binding'", 
     "/usr/lib64/ruby/1.8/irb/workspace.rb:52:in `irb_binding'", 
     "/usr/lib64/ruby/1.8/irb/workspace.rb:52"]

如果你想要一个很好地解析的回溯，以下正则表达式可能很方便：

If you want a nicely parsed backtrace, the following regex might be handy:

p x.backtrace.map{ |x|   
     x.match(/^(.+?):(\d+)(|:in `(.+)')$/); 
    [$1,$2,$4] 
}

[
  ["(irb)", "11", "foo"], 
  ["(irb)", "48", "irb_binding"], 
  ["/usr/lib64/ruby/1.8/irb/workspace.rb", "52", "irb_binding"], 
  ["/usr/lib64/ruby/1.8/irb/workspace.rb", "52", nil]
]

（正则表达式/应该/对于函数名或目录/文件名中的奇怪字符）
（如果你想知道foo来自哪里，我做了一个def来抓取异常：

( Regex /should/ be safe against weird characters in function names or directories/filenames ) ( If you're wondering where foo camefrom, i made a def to grab the exception out :

>>def foo
>>  thisFunctionDoesNotExist
>> rescue Exception => e 
>>   return e 
>>end     
>>x = foo 
>>x.backtrace

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