parse : String -> Cell
> parse "3.1"
Right (Real 3.1)
> parse "=A2+B7"
Left (Formula Add (Pair { left = { col = 1, row = 0 }, right = { col = 6, row = 1 } }))
> parse "=sum(A2:B7)"
Left (Formula Add (Range { left = { col = 1, row = 0 }, right = { col = 6, row = 1 } }))
> parse "=sum(A2:M7)"
Left (Formula Add (Range { left = { col = 1, row = 0 }, right = { col = 6, row = 12 } }))
indexParser : Parser Cell.Index
> run C.parseIndex "a2"
Ok { col = 1, row = 0 }