#!/usr/bin/ruby -w 
# HQ9++ Interpreter written in Ruby, by cypher 

class HelloWorld 
    def execute 
        puts "Hello World!" 
    end 
end 

class Quine 
    attr_reader :source 

    def initialize source 
        @source = source 
    end 

    def execute 
        puts source 
    end 
end 

class BeerSong 
    def execute 
        99.downto 1 do |num| 
            puts <<BEER 
#{num} bottle#{num>1?'s':''} of beer on the wall 
#{num} bottle#{num>1?'s':''} of beer 
take one down, pass it around, 
#{num-1!=0?num-1:"no more"} bottle#{num!=2?'s':''} of beer on the wall 

BEER 
            puts "No more bottles of beer on the wall\nOh noes!" 
        end 
    end 
end 

$accumulator = 0 

class IncreaseAccumulator 
    def execute 
        $accumulator += 1 
    end 
end 

class IncreaseAccumulatorAndCreateANewObject 
    def execute 
        $accumulator += 1 
        (@@objects ||= []) << Object.new 
    end 
end 

class HQNinePlusPlus 
    def initialize source 
        @source = source 
        @hello_worlds = [] 
        @quines = [] 
        @beer_songs = [] 
        @increase_accumulators = [] 
        @increase_accumulator_and_create_new_objects = [] 
    end 

    def parse 
        accumulator_flag = false 
        @source.downcase.each_byte do |command| 
            case command 
            when ?h 
                @hello_worlds << HelloWorld.new 
                @hello_worlds.last.execute 
            when ?q 
                @quines << Quine.new( @source ) 
                @quines.last.execute 
            when ?9 
                @beer_songs << BeerSong.new 
                @beer_songs.last.execute 
            when ?+ 
                if accumulator_flag == true 
                    @increase_accumulator_and_create_new_objects << IncreaseAccumulatorAndCreateANewObject.new 
                    @increase_accumulator_and_create_new_objects.last.execute 
                else 
                    @increase_accumulators << IncreaseAccumulator.new 
                    @increase_accumulators.last.execute 
                    accumulator_flag = true 
                    next 
                end 
            else 
                raise "#{command} is not a valid HQ9++-Command!" 
            end 
            accumulator_flag = false 
        end 
    end 
end 

if __FILE__ == $0 
    source = IO.read(ARGV[0]).chomp 
    parser = HQNinePlusPlus.new( source.gsub( /[^hq9\+]/i, '' ) ) 
    parser.parse 
end