Add Option::reduce to take an accumulator function that will be
called on every token of the same name in the token list.
Add Option::hasReducer to check that an Option has a reducer
assigned.
Update parse function for the case where a named token has an
Option with a reducer, and the token has a value preceding it.
The accumulator with call a map if also assigned on the token
value before calling the accumulator with the previous accumulated
value and the token value.
Add
Option::reduceto take an accumulator function that will be called on every token of the same name in the token list.Add
Option::hasReducerto check that an Option has a reducer assigned.Update parse function for the case where a named token has an Option with a reducer, and the token has a value preceding it. The accumulator with call a
mapif also assigned on the token value before calling the accumulator with the previous accumulated value and the token value.