From: "Ara.T.Howard" <Ara.T.Howard@...>
Date: 2005-09-10T02:46:30+09:00
Subject: Re: quick print type debugging

--8323328-1841519134-1126287987=:15399
Content-Type: MULTIPART/MIXED; BOUNDARY="8323328-1841519134-1126287987=:15399"

  This message is in MIME format.  The first part should be readable text,
  while the remaining parts are likely unreadable without MIME-aware tools.

--8323328-1841519134-1126287987=:15399
Content-Type: TEXT/PLAIN; charset=X-UNKNOWN; format=flowed
Content-Transfer-Encoding: QUOTED-PRINTABLE

On Sat, 10 Sep 2005, Eric Mahurin wrote:

> --- Florian Gro=DF <florgro@gmail.com> wrote:
>
>> Eric Mahurin wrote:
>>
>>> What would be nice is if you could somehow convert the
>> block
>>> back to text (and put it in the debug message).  Anybody
>> know
>>> how to do that?  I know I could make the block be a string
>> of
>>> the code instead to solve the problem (d{"..."}), but that
>>> would be uglier and less efficient when we have debugging
>> off
>>> (because we have to eval).
>>
>> See attachment. It's not very general, though.
>
> Perfect.  This was from a ruby quiz, right?  Now here is the
> new method (didn't need binding_of_caller.rb):
>
> require 'proc_source.rb'
>
> $DEBUG_LEVEL =3D ENV['DEBUG']||0
>
> module Kernel
>  def d(level=3D1,&block)
>    if $DEBUG_LEVEL>=3Dlevel
>      ret =3D yield
>      filename,lineno =3D block.source_descriptor
>      $stderr.printf("DEBUG: %s:%d {%s} =3D> %s\n",
>        filename,lineno,block.source,ret)
>      ret
>    else
>      yield
>    end
>  end
> end
>
>
> $DEBUG_LEVEL =3D 1
> x =3D d{1+2} + 3*4 - d{5/6}
>
> DEBUG: (irb):24 {} =3D> 3
> DEBUG: (irb):24 {} =3D> 0
> =3D> 15
>
> Didn't work.  Any idea why, Florian?  I tried aProc.source
> after using lambda to create it and it worked (also in irb).
> But, with a block it doesn't seem to.


maybe block.call instead of yield?

>
>
>> I think I'd go with the string solution, use
>> Binding.of_caller to put it
>> into the right context and alias it to a method that does
>> nothing when
>> $DEBUG isn't set.
>
> I need to evaluate the block even without debugging because the
> result will be used as part of an expression independent of
> debugging mode (see above).
>
>
>
> __________________________________________________
> Do You Yahoo!?
> Tired of spam?  Yahoo! Mail has the best spam protection around
> http://mail.yahoo.com
>
>

-a
--=20
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D
| email :: ara [dot] t [dot] howard [at] noaa [dot] gov
| phone :: 303.497.6469
| Your life dwells amoung the causes of death
| Like a lamp standing in a strong breeze.  --Nagarjuna
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D

--8323328-1841519134-1126287987=:15399--
--8323328-1841519134-1126287987=:15399--