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comp.lang.ruby

Namespacing my classes

user@domain.invalid

10/13/2008 1:59:00 PM

Hello, as I want to avoid name clashes I tried to organise them like
this (just a fake example, reflecting reality)

lib/mylib.rb contains
module Mylib

module TestDatas
FOO = "Ho yeah"
end

require 'somelib/tools'
require 'somelib/motor'
end

somelib/tools.rb contains
class Mylib::Tools
end

somelib/motor.rb contains
class Mylib::Motor

def something()
Mylib::TestDatas.FOO
end

end



Well, I did this by try/error until I had no more execution errors and
having them behaving as expected but is there any caveat ?

I'm just suprised by the location of the requires statements

Thanks
7 Answers

pjb

10/13/2008 2:14:00 PM

0

Zouplaz <user@domain.invalid> writes:

> Hello, as I want to avoid name clashes I tried to organise them like
> this (just a fake example, reflecting reality)
>
> lib/mylib.rb contains
> module Mylib
>
> module TestDatas
> FOO = "Ho yeah"
> end
>
> require 'somelib/tools'
> require 'somelib/motor'
> end
>
> somelib/tools.rb contains
> class Mylib::Tools
> end
>
> somelib/motor.rb contains
> class Mylib::Motor
>
> def something()
> Mylib::TestDatas.FOO
> end
>
> end
>
>
>
> Well, I did this by try/error until I had no more execution errors and
> having them behaving as expected but is there any caveat ?
>
> I'm just suprised by the location of the requires statements

You don't need to put these requires inside the module blocks.

Instead, you could write:

(module MyLib
(module TestData
(FOO = "abc")
end)
end)

(module MyLib
(class Tool
end)
end)

(module MyLib
(class Motor
(def something
(TestData::FOO)
end)
end)
end)

That is, if you avoid the (class Abc::Def::Ghi ... end) form, then
modules namespaces will be created automatically when needed.

Then, how you spread the forms over files and execute require is up to
you and doesn't matter much.

--
__Pascal Bourguignon__

Yossef Mendelssohn

10/13/2008 4:50:00 PM

0

On Oct 13, 9:12=A0am, p...@informatimago.com (Pascal J. Bourguignon)
wrote:
> (module MyLib
> =A0 (module TestData
> =A0 =A0 (FOO =3D "abc")
> =A0 end)
> end)
>
> (module MyLib
> =A0 (class Tool
> =A0 end)
> end)
>
> (module MyLib
> =A0 (class Motor
> =A0 =A0 (def something
> =A0 =A0 =A0 (TestData::FOO)
> =A0 =A0 end)
> =A0 end)
> end)

What are all those parentheses about?

--
-yossef

Robert Klemme

10/13/2008 5:45:00 PM

0

On 13.10.2008 18:49, Yossef Mendelssohn wrote:
> On Oct 13, 9:12 am, p...@informatimago.com (Pascal J. Bourguignon)
> wrote:
>> (module MyLib
>> (module TestData
>> (FOO = "abc")
>> end)
>> end)
>>
>> (module MyLib
>> (class Tool
>> end)
>> end)
>>
>> (module MyLib
>> (class Motor
>> (def something
>> (TestData::FOO)
>> end)
>> end)
>> end)
>
> What are all those parentheses about?

Probably a Lisp fan. :-)

$ ruby -cw <<XXX
> (module MyLib
> (module TestData
> (FOO = "abc")
> end)
> end)
> XXX
Syntax OK


To OP, usually this is structured a bit differently:

lib/mylib.rb contains

module MyLib

module TestData
FOO = "Ho yeah"
end

end

require 'mylib/tools'
require 'mylib/motor'


mylib/tools.rb contains

module MyLib
class Tools
end
end

mylib/motor.rb contains

module MyLib

class Motor
def something()
TestData::FOO
end
end

end


Btw, there is no plural of "data" in English AFAIK.

Kind regards

robert

user@domain.invalid

10/13/2008 7:13:00 PM

0

le 13/10/2008 19:44, Robert Klemme nous a dit:

>
> require 'mylib/tools'
> require 'mylib/motor'
>
>
> mylib/tools.rb contains
>
> module MyLib
> class Tools
> end
> end
>
> mylib/motor.rb contains
>
> module MyLib
>
> class Motor
> def something()
> TestData::FOO
> end
> end
>
> end
>
>
> Btw, there is no plural of "data" in English AFAIK.
>

Ho, fine ! I didn't know I could reuse Module MyLib in several place to
enclose the classes...

About 'data', I trust you ;-) I wish I could find a webchat with people
willing to speak French with me, while speaking English with them - I
could learn a alot, but for the moment, I just found men masturbating in
the dark :-))

Robert Klemme

10/13/2008 7:28:00 PM

0

On 13.10.2008 21:12, Zouplaz wrote:
> le 13/10/2008 19:44, Robert Klemme nous a dit:
>
>>
>> require 'mylib/tools'
>> require 'mylib/motor'
>>
>>
>> mylib/tools.rb contains
>>
>> module MyLib
>> class Tools
>> end
>> end
>>
>> mylib/motor.rb contains
>>
>> module MyLib
>>
>> class Motor
>> def something()
>> TestData::FOO
>> end
>> end
>>
>> end
>>
>>
>> Btw, there is no plural of "data" in English AFAIK.
>>
>
> Ho, fine ! I didn't know I could reuse Module MyLib in several place to
> enclose the classes...

Note also that you do not need the full namespace path when referencing
the const (see above).

> About 'data', I trust you ;-) I wish I could find a webchat with people
> willing to speak French with me, while speaking English with them - I
> could learn a alot, but for the moment, I just found men masturbating in
> the dark :-))

Well, you never know what it is good for. :-)

There is an IRB chat on freenode - albeit in English.

Cheers

robert

The Higgs bozo

10/13/2008 8:43:00 PM

0

Robert Klemme wrote:
>
> There is an IRB chat on freenode - albeit in English.
>

IRB chat! Now that's an awesome typo. Or maybe a Freudian slip? You
know you're a programmer when the distinction between IRB and IRC is
blurred.
--
Posted via http://www.ruby-....

Robert Klemme

10/14/2008 6:25:00 AM

0

On 13.10.2008 22:43, The Higgs bozo wrote:
> Robert Klemme wrote:
>> There is an IRB chat on freenode - albeit in English.
>
> IRB chat! Now that's an awesome typo. Or maybe a Freudian slip? You
> know you're a programmer when the distinction between IRB and IRC is
> blurred.

LOL! It was definitively unconscious. I was probably distracted. I
leave the interpretation to you. :-)

Cheers

robert


PS: Are you the unknown particle that they now cannot find because the
collider at Cern is broken?