Find opened classes

ruby-talk
1

Is there any way I can find all the classes that have been re-opened
in a project?

2

No fool proof way. Are there particular changes to a class you are
looking to track? For instance you can override method_added to see if
anyone adds any additional methods.

···

On 8/21/07, nraychaudhuri@gmail.com <nraychaudhuri@gmail.com> wrote:

Is there any way I can find all the classes that have been re-opened
in a project?

3

nraychaudhuri@gmail.com wrote:

Is there any way I can find all the classes that have been re-opened
in a project?

If you don't mind having a trace proc running while you classes are being loaded you can do this. (You can always set_trace_func(nil) later on if you want to stop wasting cpu cycles.)

opened = {}

class_tracer = proc do |event, file, line, id, binding, classname|
   case event
   when "class" # class or module definition
     cl = eval("self", binding)
     opened[cl] = true
   when "c-call"
     case id
     when :class_eval, :module_eval
       cl = eval("self", binding)
       opened[cl] = true
     end
   end
end

set_trace_func(class_tracer)

class Foo
end
class String
end
Array.class_eval {}

p opened.keys # ==> [Foo, Array, String]

···

--
       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407

4

I thought of something similar but I would just dump out class names
as they come (probably to $stderr). That way you can see when classes
are opened multiple times. Also, if you include all the info you get
during tracing you can easily locate the code:

RKlemme@padrklemme1 /cygdrive/c/Archives/jboss.org/jboss-4.2.1.GA-src
$ ruby -e 'set_trace_func lambda {|*a| p a if a.first == "class"};
class Foo; end'
["class", "-e", 1, nil, #<Binding:0x1002fdb8>, false]

Kind regards

robert

···

2007/8/22, Joel VanderWerf <vjoel@path.berkeley.edu>:

nraychaudhuri@gmail.com wrote:
> Is there any way I can find all the classes that have been re-opened
> in a project?
>

If you don't mind having a trace proc running while you classes are
being loaded you can do this. (You can always set_trace_func(nil) later
on if you want to stop wasting cpu cycles.)

opened = {}

class_tracer = proc do |event, file, line, id, binding, classname|
   case event
   when "class" # class or module definition
     cl = eval("self", binding)
     opened[cl] = true
   when "c-call"
     case id
     when :class_eval, :module_eval
       cl = eval("self", binding)
       opened[cl] = true
     end
   end
end

set_trace_func(class_tracer)

class Foo
end
class String
end
Array.class_eval {}

p opened.keys # ==> [Foo, Array, String]