相当于PERL Carp->cluck( $msg )的红宝石

Question

Perl有一个名为Carp的模块，它可以用来打印消息(w.o明确地引发异常)，它可以打印消息和完整的堆栈跟踪。也就是说。

use Carp qw(cluck) ;
cluck ("foo")

会产生：

foo called from file bar, line 2

有什么想法吗?如何在Ruby中找到类似的东西？

Answer 1

您可以为此使用Kernel#caller_locations (locations)

def cluck(val)
  loc = caller_locations.last
  puts "#{val} called from file #{loc.path}, line #{loc.lineno}"
end

cluck 1
cluck "hello"

输出：

1 called from file line_of_caller.rb, line 6
hello called from file line_of_caller.rb, line 7

这里是线程的一个实例：：loc：：Location，所以您也可以从它获得更多信息；查看http://www.ruby-doc.org/core-2.0.0/Thread/Backtrace/Location.html