Please help with this coding question. Answer must be given in java code. Thank you

Look over the given Java code for a simple expression grammar and figure out how it works. It is a simple parser that parses and calcualtes the values for a simple expression grammar (given below) { ") "." => } term => { ( "r" l "7) number l "(" "A" l => priy-number l expression> The grammars are almost the same except for the addition of exponentiation. make sure your solution works correctly for exponents (and left associativity) for example 4-2 => 16 and 232 512