private int tokenize_line(int n, String line) {
		int col = 1;
		Token tok = new Token();
		//System.out.println(line);
		while (line.length()>0) {
			int init = line.length();
			line = line.trim();
			col += init-line.length();
			if (line.length()>0) {
				if((tok = next_token(line)) == null)
					return -1;
				tok.setPos(n,col);
				col += tok.getContent().length();
				line =line.substring(tok.getContent().length(), line.length());
				//System.out.println(tok);
				//System.out.println(line);
				//System.out.println(stream);
				this.stream.add(tok);
			}
		}
		return 0;
	}