Minimalist ... even more minimal than BasicObject

In cross-stub, it is possible to declare stubs using a proc:

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Someone.xstub do def say(something) 'saying "%s"' % something end end

Implementation wise, i need a way to find out the methods delared within the proc in order to do further processing. The most straight-forward way is to have a bare minimum object, after instance_eval of the proc, do a diff of the original set of instance methods & the set of methods for this manipulated object. The following illustrates the concept:

1 2	(minimalist = Minimalist.new).instance_eval(&block) minimalist.methods - Minimalist.instance_methods

Well, i've in fact considered using BasicObject, but then, it doesn't appear to be as basic as i hope it should it. Thus i decided to handroll my own Minimalist solution:

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class Minimalist alias_method :__instance_eval__, :instance_eval alias_method :__methods__, :methods instance_methods.each{|meth| undef_method(meth) if meth.to_s !~ /^__.*?__$/ } end

As u can see (in order to prevent any methods clash with user-defined-to-be-stubbed-methods) what i've done is just:

#1. renaming instance_eval & methods to the more cryptic __instance_eval__ & __methods__, and
#2. undefining all methods, except those with prepending & appending __

It works well in ruby-1.8.7, but then, running the above in ruby-1.9.1 displays the following warning:

warning: undefining `object_id' may cause serious problem

With the solution suggested in this discussion, Minimalist is revised to:

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class Minimalist alias_method :__instance_eval__, :instance_eval alias_method :__methods__, :methods $VERBOSE = nil instance_methods.each{|meth| undef_method(meth) if meth.to_s !~ /^__.*?__$/ } $VERBOSE = true end

Now the warning doesn't show. Yet in ruby-1.8.7, i got plenty of eval warnings:

(eval):1: warning: discarding old say
(eval):1: warning: discarding old say
(eval):1: warning: method redefined; discarding old bang

Hmmm ... undaunted, i got this final version of Minimalist:

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class Minimalist alias_method :__instance_eval__, :instance_eval alias_method :__methods__, :methods orig_verbosity, $VERBOSE = $VERBOSE, nil instance_methods.each{|meth| undef_method(meth) if meth.to_s !~ /^__.*?__$/ } $VERBOSE = orig_verbosity end

Yet for jruby-1.5.1, it yields:

warning: `instance_eval' should not be aliased

The final final final (i promise) Minimalist becomes:

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class Minimalist orig_verbosity, $VERBOSE = $VERBOSE, nil # (method aliasing & removal stays here) $VERBOSE = orig_verbosity end