如何动态获取方法的源代码以及此方法位于哪个文件中 [英] How can I get source code of a method dynamically and also which file is this method locate in

问题描述

我想知道我是否可以即时获取一个方法的源代码，以及我是否可以获取这个方法在哪个文件中.

I would like to know whether I can get source code a method on the fly, and whether I can get which file is this method in.

喜欢

A.new.method(:a).SOURCE_CODE
A.new.method(:a).FILE

推荐答案

使用source_location:

class A
  def foo
  end
end

file, line = A.instance_method(:foo).source_location
# or
file, line = A.new.method(:foo).source_location
puts "Method foo is defined in #{file}, line #{line}"
# => "Method foo is defined in temp.rb, line 2"

请注意，对于内置方法，source_location 返回 nil.如果想查看 C 源代码(玩得开心！)，您必须寻找正确的 C 文件(它们或多或少按类组织)并找到 rb_define_method方法(朝向文件末尾).

Note that for builtin methods, source_location returns nil. If want to check out the C source code (have fun!), you'll have to look for the right C file (they're more or less organized by class) and find the rb_define_method for the method (towards the end of the file).

在 Ruby 1.8 中不存在此方法，但您可以使用此 gem.

In Ruby 1.8 this method does not exist, but you can use this gem.

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