system simulation

simulation.rb

#!/usr/bin/ruby
#
# Author:  Jacob Atkins
# Email:   jta4j@mcs.uvawise.edu
# Class:   CSC 4300 - Computer Architecture 
#

apps = Dir["./apps/*.hack"].sort

@@memory = Array.new(100)
@@counter = 0
@@i_register = ""
@@o_register = 0
@@accumulator = 0

def load_app(app)
	f = File.open(app, "r")
	app = f.read
	f.close
	app = app.split("\n")
	count = 0
	app.each do |d|

		command = d.split("//")
		command = command[0].chomp(" ")
		if(command != "")
			if(command.match(/^\d{2}/))
				data = command.split(" ")
				@@memory[data[0].to_i] = data[1]
			else	
				@@memory[count] = command
				count += 1
			end
		end
	end
end

def execute
	co = @@memory[@@counter].split(" ")
	while(!co[0].to_s.match(/HALT/) || co[0].nil?)
		if(co[0].to_s.match(/READ/))
			update(co)
			read
		elsif(co[0].to_s.match(/WRIT/))
			update(co)
			writ
		elsif(co[0].to_s.match(/LOAD/))
			update(co)
			load
		elsif(co[0].to_s.match(/STOR/))
			update(co)
			stor
		elsif(co[0].to_s.match(/ADD/))
			update(co)
			add
		elsif(co[0].to_s.match(/SUB/))
			update(co)
			sub
		elsif(co[0].to_s.match(/DIV/))
			update(co)
			div
		elsif(co[0].to_s.match(/MULT/))
			update(co)
			mult
		elsif(co[0].to_s.match(/JUMP/))
			update(co)
			jump
		elsif(co[0].to_s.match(/JMPN/))
			update(co)
			jmpn
		elsif(co[0].to_s.match(/JMPZ/))
			update(co)
			jmpz
		elsif(co[0].to_s.match(/DUMP/))
			@@i_register = co[0]
			dump
		elsif(co[0].to_s.match(/MODA/))
			update(co)
			moda
		end
		co = @@memory[@@counter].split(" ")
	end
end

def read
	@@memory[@@o_register] = gets.chomp.to_i
	@@counter += 1
end

def writ
	puts @@memory[@@o_register]
	@@counter += 1
end

def load
	@@accumulator = @@memory[@@o_register]
	@@counter += 1
end

def stor
	@@memory[@@o_register] = @@accumulator
	@@counter += 1
end

def add
	@@accumulator = @@accumulator + @@memory[@@o_register]
	@@counter += 1
end

def sub
	@@accumulator = @@accumulator - @@memory[@@o_register]
	@@counter += 1
end

def div
	@@accumulator = @@accumulator / @@memory[@@o_register]
	@@counter += 1
end

def mult
	@@accumulator = @@accumulator * @@memory[@@o_register]
	@@counter += 1
end

def jump
	@@counter = @@o_register
end

def jmpn
	if(@@accumulator < 0)
		@@counter = @@o_register
	end
end

def jmpz
	if(@@accumulator == 0)
		@@counter = @@o_register
	end
end

def dump
	puts
	puts "Counter: #{@@counter}"
	puts "Accumulator: #{@@accumulator}"
	puts "Instruction register: #{@@i_register}"
	puts "Operand register: #{@@o_register}"
	puts "Memory:"
	count = 0
	while count < 100
		puts "#{count} #{@@memory[count]}"
		count += 1
	end
	@@counter += 1
end

def moda
	@@memory[@@o_register] = @@accumulator
	@@counter += 1
end

def update(test)
	@@i_register = test[0]
	@@o_register = test[1].to_i
end

puts "Enter the number for the program you want to run."
acount = 1 #Count for apps
apps.each do |a|
	puts "#{acount}) #{File.basename(a)}"
	acount += 1
end
r = gets.chomp
run = apps[r.to_i - 1]
load_app(run)
execute