Forum: Ruby Why does it fail? def Module1::Module2.hello

Hi, the following code fails:


module Module1
  module Module2
  end
end

def Module1::Module2.hello
  puts "HELLO"
end

syntax error, unexpected keyword_end, expecting $end


But I can do:

def Module1.hello
  puts "HELLO"
end


why does the former fail? Any trink?

Thanks a lot.

I know one way to define module method

module Module1::Module2
  def self.hello
    puts 'HELLO'
  end
end

On Fri, Aug 3, 2012 at 11:13 PM, Iñaki Baz Castillo <ibc@aliax.net> 
wrote:

> end
>
> why does the former fail? Any trink?
>
> Thanks a lot.
>
> --
> Iñaki Baz Castillo
> <ibc@aliax.net>
>
>


--



William Herry
====================
WilliamHerryChina@Gmail.com

2012/8/4 William Herry <william.herry.china@gmail.com>:
> I know one way to define module method
>
> module Module1::Module2
>   def self.hello
>     puts 'HELLO'
>   end
> end

Sure, but what I ask is why this works:

  def Module1.hello ; end

end this fails:

  def Module1::Module2.hello ; end

Because it's how it defined in ruby syntax:   def class; dot or color; 
method name
You can't use nesting in it. So it's limited on a lexer level.

2012/8/4 Sigurd <cu9ypd@gmail.com>:
> Because it's how it defined in ruby syntax:   def class; dot or color; method 
name
> You can't use nesting in it. So it's limited on a lexer level.

Thanks for the clarification.

On Sat, Aug 4, 2012 at 7:07 PM, Iaki Baz Castillo <ibc@aliax.net> wrote:
>
> <ibc@aliax.net>
>

As Sigurd has pointed out, it's a syntax precedence thing. You can do
this however:

def (Module1::Module2).hello
  puts "HELLO"
end

Regards,
Sean

2012/8/4 Sean O'Halpin <sean.ohalpin@gmail.com>:
> As Sigurd has pointed out, it's a syntax precedence thing. You can do
> this however:
>
> def (Module1::Module2).hello
>   puts "HELLO"
> end

Great! thanks a lot.