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Module methods

Pito Salas

6/3/2009 1:17:00 PM

I am trying to do this:

==== File: good.rb ====

module Good
def init_module
@var = "good"
end

def life_is_good
puts "life is #{@var}"
end

[... more methods ...]
end

include X
init_module


======== and in a different file ========

include Good

life_is_good

- - - - - - - -

That works but messes up when I try to use ruby-debug with it. So I
changed it to try to call init_module in a different way: instead of
include X, init_module, I tried both of these, neither of which works:

X::init_module

X.init_module

Each of those calls lead to an 'undefined method 'init_module' for
X:Module.

I am getting myself confused with Module methods etc etc.

Any help would be gratefully accepted!!

Pito
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8 Answers

Mark Thomas

6/3/2009 1:29:00 PM

0

It looks like what you really want is a class. Is there a specific
reason you don't want to do this?

class Good
def initialize
@var = "good"
end

def life
puts @var
end
end

g = Good.new
g.life

Pito Salas

6/3/2009 1:54:00 PM

0

Mark Thomas wrote:
> It looks like what you really want is a class. Is there a specific
> reason you don't want to do this?
>
> class Good
> def initialize
> @var = "good"
> end
>
> def life
> puts @var
> end
> end
>
> g = Good.new
> g.life

Yeah, I am trying to make as transparent as possible "Domain Specific
Language" so that the second file looks like a program in the DSL with
as little extra stuff as possible. So the second file ends up looking
like:

include Good

life
bicycle :first
telephone :last
life


(FOR EXAMPLE :)
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Nation, Carey

6/3/2009 3:22:00 PM

0

Pretty sure that you need to prefix the module methods with the module
name. Yeah, I know.

Try:
module Good
def Good.init_module
@var =3D "good"
end
....

And the in your "different file"

require 'good';
Good.init_module

Which isn't exactly what you want. =20

<talking out of ear now>
I think that you have to prefix the method with the module name since
using it this way gets things added to main rather than to your own
class/instance. It smells like include should make it so that you can
omit the Good. on the call, but it doesn't work for me. Again, I think
it may be something to do with it being in main rather than in your own
class. You're basically trying to make a mixin for main and I
suspect/know that the rules are somewhat different.=20
</talking out of ear now>

Hope that this helps some...

-----Original Message-----
From: rps@salas.com [mailto:rps@salas.com]=20
Sent: Wednesday, June 03, 2009 9:17 AM
To: ruby-talk ML
Subject: Module methods

I am trying to do this:

=3D=3D=3D=3D File: good.rb =3D=3D=3D=3D

module Good
def init_module
@var =3D "good"
end

def life_is_good
puts "life is #{@var}"
end

[... more methods ...]
end

include X
init_module


=3D=3D=3D=3D=3D=3D=3D=3D and in a different file =
=3D=3D=3D=3D=3D=3D=3D=3D

include Good

life_is_good

- - - - - - - -

That works but messes up when I try to use ruby-debug with it. So I
changed it to try to call init_module in a different way: instead of
include X, init_module, I tried both of these, neither of which works:

X::init_module

X.init_module

Each of those calls lead to an 'undefined method 'init_module' for
X:Module.

I am getting myself confused with Module methods etc etc.

Any help would be gratefully accepted!!

Pito
--=20
Posted via http://www.ruby-....

Mark Thomas

6/3/2009 6:59:00 PM

0

On Jun 3, 9:54 am, Pito Salas <r...@salas.com> wrote:
> Yeah, I am trying to make as transparent as possible "Domain Specific
> Language" so that the second file looks like a program in the DSL with
> as little extra stuff as possible. So the second file ends up looking
> like:
>
> include Good
>
> life
> bicycle :first
> telephone :last
> life

I think part 4 of this article is worth reading:
http://deadprogrammersociety.blogspot.com/2006/11/ruby-domain-specific-languages-basi...

Gregory Brown

6/3/2009 8:53:00 PM

0

On Wed, Jun 3, 2009 at 3:00 PM, Mark Thomas <mark@thomaszone.com> wrote:

> I think part 4 of this article is worth reading:
> http://deadprogrammersociety.blogspot.com/2006/11/ruby-domain-specific-languages-basi...

Also, the sample chapter of my book has a relevant section about this,
under "Building Flexible Interfaces":

http://oreilly.com/catalog/9780596156749/...

Pito Salas

6/8/2009 10:35:00 PM

0

Gregory Brown wrote:
> On Wed, Jun 3, 2009 at 3:00 PM, Mark Thomas <mark@thomaszone.com> wrote:
>
>> I think part 4 of this article is worth reading:
>> http://deadprogrammersociety.blogspot.com/2006/11/ruby-domain-specific-languages-basi...
>
> Also, the sample chapter of my book has a relevant section about this,
> under "Building Flexible Interfaces":
>
> http://oreilly.com/catalog/9780596156749/...

Greg, I read the chapter. Excellent stuff. When's the book coming out?
Or is it?

- Pito
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Gregory Brown

6/9/2009 12:54:00 PM

0

On Mon, Jun 8, 2009 at 6:34 PM, Pito Salas<rps@salas.com> wrote:
> Gregory Brown wrote:
>> On Wed, Jun 3, 2009 at 3:00 PM, Mark Thomas <mark@thomaszone.com> wrote:
>>
>>> I think part 4 of this article is worth reading:
>>> http://deadprogrammersociety.blogspot.com/2006/11/ruby-domain-specific-languages-basi...
>>
>> Also, the sample chapter of my book has a relevant section about this,
>> under "Building Flexible Interfaces":
>>
>> http://oreilly.com/catalog/9780596156749/...
>
> Greg, I read the chapter. Excellent stuff. When's the book coming out?
> Or is it?

It's already off to the printers so if you pre-order it now you should
have it within the next couple weeks.

-greg

Pito Salas

6/9/2009 2:58:00 PM

0

Gregory Brown wrote:
> On Mon, Jun 8, 2009 at 6:34 PM, Pito Salas<rps@salas.com> wrote:
>>
>> Greg, I read the chapter. Excellent stuff. When's the book coming out?
>> Or is it?
>
> It's already off to the printers so if you pre-order it now you should
> have it within the next couple weeks.
>
> -greg

http://www.salas.com/2009/06/09/geeky-check-out-ruby-best-practices-book-no...

:)
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