Finding Two Patterns In Column And Doing Calculations Depending On Pattern Order Found

I'm attempting to do work on pattern detection and actions based on how said patterns occur in a column. Here is what I would like excel to do for me:

Code:
Pattern W1

Example A1=A , A2=A , A3=B

Pattern L1 Consecutive "A" 3 or more

Example A4=A , A5=A , A6=A

Triggers on specific events:

While L1 tracking variable = 0 -- If L1 is found, mark a variable to -2 then set the corresponding cell in the column over to the value of the variable (-2)

While L1 tracking variable < 0 -- If consecutive L1s are found one after another, then (on each consecutive occurence) multiply the variable by 3, then set the corresponding cell in the column over to the value of the variable

If W1 is found while L1's variable is < 0, then multiply the value of the L1 tracking variable by -1 and add 1, then set the corresponding cell in the column over to the value of the L1 variable, then set L1's tracking variable to 0

If W1 is found while L1's variable is = 0, then set the corresponding cell in the column over to the value of 1

All data is in one column.