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comp.lang.ruby

Method parameters reflection

George Moschovitis

2/28/2005 8:43:00 AM

Hello everyone,

I would like to use some kind of reflection to get the parameters of a
method.
For example:

class MyClass
def simple_method(last_name, name)
end
end

method_params(MyClass, :simple_method)
=> [:last_name, :name]

I have implement this using ParseTree, but since ParseTree uses
RubyInline which requires a C compiler, and AFAIK is not portable, I
would like a better solution.

Anyone has an idea?

George.
4 Answers

Hal E. Fulton

2/28/2005 1:46:00 PM

0

George Moschovitis wrote:
> Hello everyone,
>
> I would like to use some kind of reflection to get the parameters of a
> method.

[snip]

I have wanted this, too, but AFAIK there is no
good solution at present.


Hal

George Moschovitis

2/28/2005 2:06:00 PM

0

>> I would like to use some kind of reflection to get the parameters of a
>> method.
>
>
> [snip]
>
> I have wanted this, too, but AFAIK there is no
> good solution at present.

ParseTree is a great solution, but it uses RubyInline which
requires a C compiler (typically gcc). No luck with Windows.

I _think_ ParseTree could use RubyDL like EvilRuby. This would be
something nice to have in Ruby 1.9. In the meantime I will try to play a
bit with EvilRuby, or perhaps Florian Gross could help here :) :)

regards,
George.

Florian Gross

2/28/2005 2:41:00 PM

0

George Moschovitis wrote:

> ParseTree is a great solution, but it uses RubyInline which
> requires a C compiler (typically gcc). No luck with Windows.
>
> I _think_ ParseTree could use RubyDL like EvilRuby. This would be
> something nice to have in Ruby 1.9. In the meantime I will try to play a
> bit with EvilRuby, or perhaps Florian Gross could help here :) :)

Well, EvilRuby does not do this either as it's quite some work to dig
through all the pointers in that structures.

And porting ParseTree over to Ruby/DL could be problematic as well...
(It does a lot of its logic in C and Ruby/DL does AFAIK not yet work
correctly on 64 bit machines.)

timsuth

3/6/2005 7:28:00 AM

0

In article <1109580197.206700.52550@o13g2000cwo.googlegroups.com>, George
Moschovitis wrote:
>Hello everyone,
>
>I would like to use some kind of reflection to get the parameters of a
>method.
>For example:
>
>class MyClass
> def simple_method(last_name, name)
> end
>end
>
>method_params(MyClass, :simple_method)
>=> [:last_name, :name]
>
>I have implement this using ParseTree, but since ParseTree uses
>RubyInline which requires a C compiler, and AFAIK is not portable, I
>would like a better solution.

When Ruby gets named parameters, I guess this will be provided. Not quite
the answer you're looking for ;-)