From: Mark Hubbart <discordantus@...>
Date: 2005-02-12T08:45:54+09:00
Subject: Re: Correction to one of my input lines

Hi,

On Sat, 12 Feb 2005 03:46:28 +0900, Harry Truax <htruax@stf.com> wrote:
> Hi,
> 
> I noticed an error in one of my input lines -
> 
> Here is another:
> 
> box1_32 = $CUR % (condition(((box1_31).count).eq(0.to_s), '',
> condition((box1_31).gt(0.to_s), (box1_31) * ((7.9.to_s).percent), nil)))
> print 'box1_32', box1_32
> 
> Convert the above to:
> 
> box1_32 = $CUR % (box1_31.to_f > 0.0 ? box1_31.to_f * 0.079 : 0.0) print
> 'box1_32', box1_32
> 
> THE INPUT LINE SHOULD BE:
> 
> box1_32 = $CUR % (condition(((box1_31).count).eq(0.to_s), '',
> condition((box1_31).gt(0.to_s), (box1_31) * ((7.9.to_s).percent), nil)))
> 
> THE OUTPUT SHOULD BE:
> 
> box1_32 = $CUR % (box1_31.to_f > 0.0 ? box1_31.to_f * 0.079 : 0.0)

Perhaps it would be easier to modify Ruby to accept the original
syntax, than to modify the syntax to fit Ruby. For the above example:

  def condition(cond, iftrue, iffalse)
    cond ? iftrue: iffalse
  end
  class Object
    alias_method :eq, :==
  end

... and so on. Adding the proper methods should make it possible to
run your original code directly within Ruby.

If you don't want to pollute the namespace of your enclosing script,
you might try something like this (UNTESTED!)


  funky_script_text = load_funky_script_file

  ruby_conversion_code = <<EOC
    def condition(cond, iftrue, iffalse)
      #... more code
  EOC

  data_collection_code = <<EOC
    data = {}
    data[:return_values] = $Foo
    data[:bar_stuff] = $Bar
    data[:other] = $CUR
    print Marshall::dump(data)
  end

  raw_data = IO.popen("ruby", "w+") do |ruby|
    ruby.write ruby_conversion_code
    ruby.write funky_script_text
    ruby.write data_collection_code
    ruby.close_write
    ruby.read
  end

  data = Marshall::load(raw_data)

  # do stuff with the reconstituted data hash
  data[:other].each_line{|l| p l} #... and so on

HTH,
Mark