From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2010-08-20T20:43:32+09:00
Subject: Re: function call using reflection

On Fri, Aug 20, 2010 at 1:12 PM, Rajarshi Chakravarty
<raj_plays@yahoo.com> wrote:
> Hi,
> I get each part of the following command in a string at runtime
> Mod1::Util.parser1("log.txt")
>
> So I have the following strings:
> s1 = "Mod1"
> s2 = "Util"
> s3 = "parser1"
> s4 = "log.txt"
>
> Now I want to prepare the command and execute it at runtime.
>
> Object::const_get(s1 + "::" + s2 + "." + s3 + "(\"" + s4 + "\")")
> does not work.

If you know the first one is a module and the second a class, you could try:

irb(main):001:0> module A
irb(main):002:1> class B
irb(main):003:2> def parse(param)
irb(main):004:3> puts "parsing #{param} ..."
irb(main):005:3> end
irb(main):006:2> end
irb(main):007:1> end
=> nil
irb(main):008:0> s1 = "A"
=> "A"
irb(main):009:0> s2 = "B"
=> "B"
irb(main):010:0> s3 = "parse"
=> "parse"
irb(main):011:0> s4 = "filename.txt"
=> "filename.txt"
irb(main):014:0> m = Object.const_get(s1)
=> A
irb(main):015:0> c = m.const_get(s2)
=> A::B
irb(main):017:0> c.new.send(s3, s4)
parsing filename.txt ...

Jesus.