#!/usr/bin/python
# -*- encoding: utf-8 -*-
__version__=0.2


class LSystem(object):
	def __init__(self,funcs,deep=3):
		self.x=0
		self.y=0
		self.leftB=0
		self.rightB=0
		self.topB=0
		self.bottomB=0
		self.rules = dict()
		self.deep = deep
		self.funcs=funcs 
		print self.funcs

	def setAxiom(self,axiom):
		self.axiom = axiom

	def registerRule(self,name,rule):
#		if not name in self.funcs:
		self.rules[name]=rule

	def setDeep(self,deep):
		self.deep = deep

  	def interSteps(self,string,deep):
		for c in string:
			if self.rules.has_key(c):
				if deep<self.deep:
 					for ch in self.interSteps(self.rules[c],deep+1):
						yield ch
				elif c in self.funcs:
					yield c
			else:
				yield c

	def steps(self):
 		yield self.interSteps(self.axiom,1)


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