Help for Calculating Bowling Score

I'm trying to write a code to calculate a bowling score. The in file will have just a line of characters (XXX9/90F99-) where X is a strike, / is a spare, F is a foul, and - is a gutter ball. What's the best way to go about getting analyzing each frame so that I can calculate the score for each frame. For instance, if you get a spare you get 10 pts plus however many points you score on the first ball of the next frame, and so on... a strike is 10 pts plus the next two balls of the next frame, etc. If anyone could just help nudge me in the right direction on some of the ways I could set up this problem let me know. I've considered functions for calculating the score, but there always seems to be something I'm missing.

What have you considered? What do you think is missing?

when you say you have considered do you mean written stuff down or only gone through in your head or actually coded? post a function