public Token simpleExpr() throws OperazioneNonValidaException, ParentesiParsingException
	{
		Token t = peek();
		if(t.ritornaTipoToken().equals(Tok.LEFT_PAR))
		{
			consume();
			Token result = expr();
			try
			{
			if(point>text.size()-1||!peek().ritornaTipoToken().equals(Tok.RIGHT_PAR))
				throw new ParentesiParsingException();
			}
			catch(ParentesiParsingException e)
			{
				e.printStackTrace();
				throw new ParentesiParsingException();
			}
			consume();
			return result;
		}
		else if(isTerm(t))
		{
			consume();
			return t;
		}
		else
		{
			try
			{
				throw new OperazioneNonValidaException();	
			}
			catch(OperazioneNonValidaException e)
			{
				e.printStackTrace();
				throw new OperazioneNonValidaException();
			}
		}
	}