如何跟踪红宝石程序的执行过程 [英] How to track the execution process of ruby program

问题描述

我是红宝石的新手，当我对某些程序感到困惑时，我想跟踪红宝石程序的执行过程.我想知道是否有一种方法可以像Shell脚本set -x一样帮助我进行跟踪?

I am new to ruby and I want to track the execution process of ruby program when I feel confused about some programs. I wonder whether there is a way to help me track just as shell scripts set -x do?

PS:

例如shell脚本test.sh:

Such as shell script test.sh:

set -x
ls /home
echo "hello dujun and haotianma!"

当我执行test.sh时，输出将类似于:

when I execute test.sh, then the output will be like:

+ ls /home
dujun  haotianma
+ echo 'hello dujun and haotianma!'
hello dujun and haotianma!

就像这个bash脚本在执行之前如何回显每个语句一样，我想让Ruby程序显示正在执行的语句.

Just as how this bash script echos each statement before executing it, I want to make a Ruby program show which statements are executing.

推荐答案

我认为您可以使用Ruby的stdlib

I think you can use the Ruby's stdlib Tracer.

我在test.rb文件中写了一个代码:

I wrote a code in my test.rb file :

require 'tracer'

Tracer.on

class A
  def square(a)
    @b = a*a
    result
  end
  def result
    @b
  end
end

a = A.new
puts a.square(5)

Tracer.off

现在运行代码，并查看所有内容:

Now run the code, and see all what's going on under the hood :

(arup~>Ruby)$ ruby test.rb
#0:test.rb:5::-: class A
#0:test.rb:5::C: class A
#0:test.rb:6::-:   def square(a)
#0:test.rb:10::-:   def result
#0:test.rb:13::E: end
#0:test.rb:15::-: a = A.new
#0:test.rb:16::-: puts a.square(5)
#0:test.rb:6:A:>:   def square(a)
#0:test.rb:7:A:-:     @b = a*a
#0:test.rb:8:A:-:     result
#0:test.rb:10:A:>:   def result
#0:test.rb:11:A:-:     @b
#0:test.rb:12:A:<:   end
#0:test.rb:9:A:<:   end
25
#0:test.rb:18::-: Tracer.off
(arup~>Ruby)$ 

---

再次查看代码.现在，我更改了跟踪点.

---

Again look at the code. Now I changed trace point.

require 'tracer'

class A
  def square(a)
    @b = a*a
    result
  end
  def result
    @b
  end
end

Tracer.on

a = A.new
puts a.square(5)

Tracer.off

现在运行代码，并查看所有内容:

Now run the code, and see all what's going on under the hood :

(arup~>Ruby)$ ruby test.rb
#0:test.rb:15::-: a = A.new
#0:test.rb:16::-: puts a.square(5)
#0:test.rb:4:A:>:   def square(a)
#0:test.rb:5:A:-:     @b = a*a
#0:test.rb:6:A:-:     result
#0:test.rb:8:A:>:   def result
#0:test.rb:9:A:-:     @b
#0:test.rb:10:A:<:   end
#0:test.rb:7:A:<:   end
25
#0:test.rb:18::-: Tracer.off
(arup~>Ruby)$ 

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