Unicode HQ9+ Implementation

q9+

#!/usr/bin/env ruby
# coding: utf-8

##
# In HQ9+ Hello world programs were unnecessarily long which caused a
# dramatic waste in space. It is estimated that a massive 4 PB of
# storage space worldwide is used to store "Hello, World!" programs a
# further 2 PB of space is used to store "Hello, World" programs. Q9+
# attempts to solve this problem this problem by making the empty file a
# "Hello World" program. As a result of this a standard 2 TB harddrive
# can now store over 2 million Hello World programs. The complete source
# code for the "Hello, World!" program in Q9+ is listed below:
#
#
#
# HQ9+: http://web.archive.org/web/20090602074545/http://www.cliff.biffle.org/esoterica/hq9plus.html
# Q9+'s spec:
#
# - An empty file prints "Hello, world!"
# - Q Prints the entire text of the source code file.
# - 9 Prints the complete canonical lyrics to "99 Bottles of Beer on the Wall"
# - + Increments the accumulator.
# 
# Since Q requires the complete source code, you can't process it from stdin.

source_code = ""
while (f = gets) do
  source_code << f
end

$accumulator = 0
$bottles = 0

def bottles(n)
  if n > 0
    $bottles += 1
    "#{n} 🍶 of 🍺 on the wall, #{n} 🍶 of 🍺. \nTake one down, pass it around, #{n-1} 🍶 of 🍺 on the wall.\n" + bottles(n-1)
  else
    ""
  end
end


if source_code == "" then
	puts "Hello, world!"
end
source_code.chars do |c|
  if (c == "Q")
    puts source_code
  elsif (c == "9")
    puts bottles(99)
  elsif (c == "+")
    $accumulator += 1
  else
    # Nothing
  end
end

if ENV["DEBUG"] == "true"
  puts "=== DEBUG ==="
  puts ""
  puts "Total Bottles: #{$bottles}"
  puts "Accumulator: #{$accumulator}"
end