<LocalJumpError: return from proc-closure> in WebDialog

[MartinRinehart]

Google search found a two-year old thread near this topic, which helped me work around a Ruby bug. This post is for the next victim of this bug.

With smaller models, this code, in an action callback, worked:

# update some stuff
return if msg.nil? # msg == a callback argument

handle the msg

With a large model, it failed, showing the title error. This solved the problem:

# update some stuff

unless msg.nil?
    handle the msg
end

[markozeta]

Interesting... Glad the model helped then. Wonder what caused it...?

[Jim]

I don't know the finer details yet, but returning from a proc causes the error.

You also get similar errors if you try to return values from command validation procs.

This causes an error.

def my_validation_proc
  if Sketchup.active_model.selection.nitems == 1
    return MF_ENABLED
  else
     return MF_GRAYED
  end
end

This does not

def my_validation_proc
  if Sketchup.active_model.selection.nitems == 1
    MF_ENABLED
  else
     MF_GRAYED
  end
end

[thomthom]

Rather odd, isn't it, as return is implied in Ruby... no?

[Jim]

Maybe, but I don't understand it myself. Rather than returning from the proc, the proc itself evaluates, and that is what is returned.