From: "Esteban Manchado Velázquez" <zoso@...>
Date: 2006-06-11T04:09:15+09:00
Subject: Re: Global not evaluated properly in 'if' statement modifier

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Hi Darren,

On Sun, Jun 11, 2006 at 03:13:30AM +0900, darren kirby wrote:
> Hello all,
>=20
> I am scratching my head over this one.
> I have a method:
>=20
> def dispatchFile(file)
>   song =3D Convert.new(file)
>   case type
>   when 'ogg'
>     song.oggToWav
>     song.wavToOgg  if $outtype =3D=3D 'ogg'
>     song.wavToMp3  if $outtype =3D=3D 'mp3'
>     song.wavToM4b  if $outtype =3D=3D 'm4b'
>     song.wavToFlac if $outtype =3D=3D 'flac'
>   when 'mp3'
> <etc....>
>   end
> end

    Some suggestions:

    1) I would calculate the method name dinamically with $outtype, instead=
 of
having 4 if constructions. Something like:

    song.send "wavTo#{$outtype.capitalize}"

    2) I wouldn't use a global variable anyway. I think it's better sending
the out type as a parameter.
    3) What is "type", a method? It should probably also be a parameter for
dispatchFile, but I don't know if that's a function or a method.
    4) Wouldn't it be better having dispatchFile as a Convert method? Perha=
ps
with other name, but...

> When I run this code the 'if's are never evaluated. That is, I have print=
ed=20
> $outtype, and it has a valid value, but the second method which matches t=
he=20
> value never runs. If I comment out the 'if' and run the two methods manua=
lly=20
> it works fine.
>=20
> In my tests $outtype's value is 'mp3', so why doesn't song.wavToMp3 run?
> What am I missing?

    I made a quick test and it worked for me, but I don't know the rest of
your code. This is the example that worked:

------------------------------------- 8< ----------------------------------=
---
class Convert
    def initialize(file); end

    def oggToWav;  puts "oggToWav"; end
    def wavToOgg;  puts "wavToOgg"; end
    def wavToMp3;  puts "wavToMp3"; end
    def wavToM4b;  puts "wavToM4b"; end
    def wavToFlac; puts "wavToFlac"; end
end

def type; "ogg"; end

$outtype =3D 'mp3'

def dispatchFile(file)
  song =3D Convert.new(file)
  case type
  when 'ogg'
    song.oggToWav
    song.wavToOgg  if $outtype =3D=3D 'ogg'
    song.wavToMp3  if $outtype =3D=3D 'mp3'
    song.wavToM4b  if $outtype =3D=3D 'm4b'
    song.wavToFlac if $outtype =3D=3D 'flac'
  when 'mp3'
    puts "mp3 nsbb"
  end
end


dispatchFile('foo')
------------------------------------- >8 ----------------------------------=
---

It printed "oggToWav" and "wavToMp3".  It probably has nothing to do with
global variables not evaluating, but I can't tell without seeing the rest of
the code.

    Regards,

--=20
Esteban Manchado Vel=E1zquez <zoso@foton.es> - http://www.foton.es
EuropeSwPatentFree - http://EuropeSwPatentFree.hispalinux.es

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