From: darren kirby <bulliver@...>
Date: 2006-08-20T21:34:07+09:00
Subject: Re: [QUIZ] [Solution] QAPrototype (#91)

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Well, here is my solution. I kind of surprised myself at how short it is, b=
ut=20
then, there are many ways I could make this much better. The biggest proble=
m=20
is that it cannot deal with arguments to the methods. It uses a global to=20
keep track of the interactively coded methods, I just couldn't get it to wo=
rk=20
any other way. I guess this is because modules/mixins are not supposed to=20
have instance variables or keep track of their own state. The print_method=
=20
function will break if your method is a one-liner. I know I could do some=20
case-analysis to take care of this but I am a lazy, lazy man.

Here is a brief irb session demonstrating it, the code follows...
#########################################

> load 'quiz91.rb'
> class Test; include MethodMaker; end
> test =3D Test.new
> test.foobar()
No such method: foobar
Care to define foobar? (y/n) y
Enter method definition ([ctrl-d] when done):
first =3D "Ruby"
middle =3D "is teh"
last =3D "roXX0r"
puts "#{first} #{middle} #{last}"
<ctrl-d>
=3D> nil
> test.foobar()
Ruby is teh roXX0r
=3D> nil
> test.print_method("foobar")
def foobar
  first =3D "Ruby"
  middle =3D "is teh"
  last =3D "roXX0r"
  puts "#{first} #{middle} #{last}"
end
=3D> nil
> test.another_one()
No such method: another_one
Care to define another_one? (y/n) y
Enter method definition ([ctrl-d] when done):
a =3D 4
b =3D 5
c =3D 67
return a + b + c
<ctrl-d>
=3D> nil
> x =3D test.another_one()
=3D> 76
> x
=3D> 76
> test.print_method("another_one")
def another_one
  a =3D 4
  b =3D 5
  c =3D 67
  return a + b + c
end
> ...

#########################################

module MethodMaker
  $imethods =3D Hash.new

  def method_missing(method_name)
    puts "No such method: #{method_name}"
    # It might be a simple typo...
    # so give a chance to bail out.
    print "Care to define #{method_name}? (y/n) "
    if $stdin.getc =3D=3D 121 # 'y'
      prompt_method(method_name)
    else
      raise NoMethodError, "#{method_name}"
    end
  end

  def prompt_method(name)=20
    puts "Enter method definition ([ctrl-d] when done):"
    meth =3D "def #{name}"
    while $stdin.gets
      meth +=3D $_
    end
    meth +=3D "end"
    meth =3D meth.gsub("\n",";")
    $imethods["#{name}"] =3D meth
    eval meth
  end

  def print_method(name)
    meth_Array =3D $imethods[name].split(";")
    puts meth_Array[0]
    meth_Array[1..meth_Array.size-2].each { |line| puts "  #{line}" }
    puts meth_Array[-1]
  end
end

########################################

=2Dd
=2D-=20
darren kirby :: Part of the problem since 1976 :: http://badcomputer.org
"...the number of UNIX installations has grown to 10, with more expected..."
=2D Dennis Ritchie and Ken Thompson, June 1972

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