Tmachine.rb

$LOAD_PATH << './'
require 'Tape.rb'
require 'Rules.rb'
require 'Exception.rb'
require 'Printer.rb'
require 'Loader.rb'

class Tmachine

	attr 	:currentState
	attr 	:printer
	attr	:loader
	attr	:tape
	attr	:theRules

	def initialize(path)
		@printer = Printer.new("/dev/stdout")
		printer.print("Loading file",INFO)
		begin
			@loader = Loader.new(path)
		rescue ParseException => e
			printer.print(e.message,WARNING)
			exit
		end
		printer.print("Parsing rules",INFO)
		@theRules = Rules.new(loader.rules)
		printer.print("Initializing tape",INFO)
		@tape = Tape.new(loader.alphabet)
		printer.print("Filling tape",INFO)
		begin
			tape.fillTape(loader.tape)
		rescue SymbolException => e
			printer.print(e.message,WARNING)
			exit
		end
		printer.print("Initial tape",STATUS)
		printer.print(tape.toString,TAPE)
		@currentState = STATE_START
	end

	def start()
		transition = 0
		while currentState != STATE_STOP
			printer.print("Current State : "+currentState, STATUS)
			printer.print("Reading Symbol: "+tape.getUnderCur,STATUS)
			arr = theRules.applyRule(currentState, tape.getUnderCur)

			if arr == nil 
				printer.print("No rules found",WARNING)
				printer.print("STOPPED ON TRANSITION "+iter.to_s, WARNING)
				printer.print("WITH STATE "+currentState,WARNING)
				printer.print("WITH SYMBOL"+tape.getUnderCur,WARNING)
				return
			end
			printer.print("Applying rules :",STATUS)
			printer.print("	new state	: "+ arr[POS_STATE],STATUS)
			printer.print("	new symbol	: "+ arr[POS_SYM],STATUS)
			printer.print("	move		: "+ arr[POS_MOVE],STATUS)
			@currentState = arr[POS_STATE] 	# new state
			begin 
				tape.putSymbol(arr[POS_SYM])
			rescue SymbolException => e
				printer.print(e.message,WARNING)
				exit
			end
			case arr[POS_MOVE]
            when SHIFT_RIGHT then
                tape.rightMove
            when SHIFT_LEFT then
				tape.leftMove
			end
			printer.print("Tape on transition "+transition.to_s,STATUS)
			printer.print(tape.toString,TAPE)
			transition+=1
		end
		printer.print("Final tape:",STATUS)
		printer.print(tape.toString,TAPE)
		printer.print("Number of transitions: " + transition.to_s,STATUS)
	end
end