From: Simon Strandgaard <qj5nd7l02@...>
Date: 2003-11-17T10:22:38+09:00
Subject: Re: overload method in module_eval,  how?

On Mon, 10 Nov 2003 15:48:22 +0100, ts wrote:

>>>>>> "S" == Simon Strandgaard <qj5nd7l02@sneakemail.com> writes:
> 
> S> any ideas to what can cause such a problem ?
> 
> S>    args.each{|method| 
> S>      name = method.id2name
> S>      org = "_debug_"+name
> S>      arguments = (method.arity > 0) ? "(*a,&b)" : "(&b)"
> 
> svg% ruby -e 'def test_x() end; :test_x.arity'
> -e:1: undefined method `arity' for :test_x:Symbol (NoMethodError)
> svg% 
> 
> svg% ruby -e 'def test_x() end; p method(:test_x).arity'
> 0
> svg% 
> 
>  and you can have an arity < 0

changing so it becomes (arity != 0), will that be ok?

Still only the first output statement are working.
I don't understand why the successive print-statements doesn't output
anything.  Any hints ?


--
Simon Strandgaard

server> ruby test_dbg.rb
["test_x"]
Loaded suite test_dbg
Started
..
Finished in 0.003568 seconds.

1 tests, 1 assertions, 0 failures, 0 errors
server> expand -t2 test_dbg.rb 
require 'test/unit'

class Object
  def self.debug(*args)
    p instance_methods(false)
    args.each{|m| 
      name = m.id2name
      org = "_debug_"+name
      n = method(m).arity
      puts "method=#{name}  arity=#{n}"  # No output, why ?
      arguments = (n != 0) ? "(*a,&b)" : "(&b)"
      code=<<MSG
      alias #{org} #{name}
      def #{name}#{arguments}
        $stdout.puts("before")
        #{org}#{arguments}
        $stdout.puts("after") 
      end
      private :#{org}
MSG
      module_eval code
    }
    p instance_methods(false)  # No output, why ?
  end
end

class TestDbg < Test::Unit::TestCase
  def test_x
    assert_equal(true, true)
  end
  debug :test_x
end

require 'test/unit/ui/console/testrunner'
Test::Unit::UI::Console::TestRunner.run(TestDbg)
server>