class String
  def convert_base(from, to)
    self.to_i(from).to_s(to)
    # In Ruby 1.9.2+ the more strict below is possible:
    # Integer(self, from).to_s(to)
  end
end
input_file = ""
output_file = ""
ins_table = {}
n = 1
a = 0
zero=false
incn = true
mem = []
stop = false
while !stop
puts "Stop?"
stop = gets.chomp
if stop == "Y" or "y"
stop = true
else
stop = false
end
puts "Addr:"
addr = gets.chomp.to_i
puts "Data:"
data = gets.chomp.to_i
mem[addr] = data
end
ins_table["1"]="ld"
ins_table["2"]="str"
ins_table["3"]="add"
ins_table["4"]="sub"
ins_table["5"]="jmp"
ins_table["6"]="jmpz"
ins_table["7"]="jmpnz"
ins_table["8"]="imm"
print "Code file:"
input_file = gets.chomp
output_file = input_file.gsub(".code",".data")
output_file = File.open(output_file,"w")
while n <= File.foreach(input_file).count
	puts "Executing"
	line = IO.readlines(input_file)[n]
	ins = ins_table[line[0]]
	arg = String(line[1]) + String(line[2]) + String(line[3]) + String(line[4])
	arg = arg.convert_base(16,10)
	arg = Integer(arg)
	if ins == "ld"
		if arg < 65536
			if mem[arg] != nil
				a = mem[arg]
			else
				a = 0
			end
		end
	elsif ins == "str"
		if arg < 65536
			mem[arg] = a
		end
	elsif ins == "add"
		if mem[arg] != nil
			if mem[arg] + a < 4294967296
				a = mem[arg] + a
				if a == 0
					z=true
				end
			else
				exit
			end
		end
	elsif ins == "sub"
		if mem[arg] != nil
			if a - mem[arg] >= 0
				a = mem[arg] + a
			else
				exit
			end
		end
	elsif ins == "jmp"
		n = arg + 1
		incn = false
	elsif ins == "jmpz"
		if zero
			n = arg + 1
		incn = false
	end
	elsif ins == "jmpnz"
		if not zero
			n = arg + 1
			incn = false
		end
	elsif ins == "imm"
		a = arg
	end
	if incn
		n += 1
	else
		incn = true
	end
	string = ""
	mem.each do |key, value|
		string += "#{key}=>#{value}, "  
		output_file.puts string
	end
end