Lazarus Lazaridis Lazarus Lazaridis - 1 month ago 5
Ruby Question

Source location of a class

I want to find the instance methods defined inside a class (explicitly with

def
, not those deriving from other calls like
attr_accessor
)

To do that, I thought of looping the
instance_methods(false)
result and check if each method's
source_location
is the same as the class's source location.

How can I find a class's source location?

Answer

[not actually an answer to your problem, but too long for a comment]

source_location doesn't seem to help here, because dynamic methods can be created with an arbitrary location:

# my_class.rb

class MyClass
  attr_accessor :foo

  class_eval(<<-RUBY, __FILE__, __LINE__ + 1)
    def bar
    end
  RUBY

  class_eval(<<-RUBY, 'dummy.rb', 42)
    def baz
    end
  RUBY
end

p MyClass.instance_method(:foo).source_location
p MyClass.instance_method(:bar).source_location
p MyClass.instance_method(:baz).source_location

Output:

$ ruby my_class.rb
["my_class.rb", 4]
["my_class.rb", 7]
["dummy.rb", 42]
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