text: class Position:
  	def __init__(self, idx, ln, col, fn, ftxt):
  		self.idx = idx
  		self.ln = ln
  		self.col = col
  		self.fn = fn
  		self.ftxt = ftxt
  
  	def advance(self, current_char=None):
  		self.idx += 1
  		self.col += 1
  
  		if current_char == '\n':
  			self.ln += 1
  			self.col = 0
  
  		return self
  
  	def copy(self):
  		return Position(self.idx, self.ln, self.col, self.fn, self.ftxt)