From: hipster <hipster@...4all.nl>
Date: 2000-11-09T00:51:44+09:00
Subject: [ruby-talk:6170] Re: Mapping text to method calls

On Thu, 09 Nov 2000  00:40:03 +0900, aschneiderman@my-deja.com wrote:
> I'm writing a voice-driven code editor, and I need to be able to map
> command names to method calls.  In other words,
> 
>     "find save"  -->   editor.find("save")
>     "mail"       -->   mail.checkMail
> 
> In Python, this is fairly easy to do.  How do you do it in Ruby?

e.g.:

---8<---
class Dispatcher
  def initialize
    @map = Hash.new
  end

  def dispatch id
    # or "eval id" (relies on method_missing)
    begin
      method(id).call
    rescue NameError
      puts "undefined method: #{id}"
    end
  end

  private

  def a
    puts "called a"
  end

  def b
    puts "called b"
  end

  def method_missing id
    puts "method_missing: #{id.id2name}"
  end
end

d = Dispatcher.new
while (line = gets) != nil
  d.dispatch line.chomp!
end
---8<---

$ dispatcher
a
called a
foo
undefined method: foo
$ _

	regards,
	Michel