antlr-insert-option-do is a compiled Lisp function in `antlr-mode.el'.

(antlr-insert-option-do LEVEL OPTION OLD AREA POS)

Insert option into buffer at position POS.
Insert option of level LEVEL and name OPTION. If OLD is non-nil, an
options area is already exists. If OLD looks like (BEG . END), the
option already exists. Then, BEG is the start position of the option
value, the position of the `=' or nil, and END is the end position of
the option value or nil.

If the original point position was outside an options area, AREA is nil.
Otherwise, and if an option specification already exists, AREA is a cons
cell where the two values determine the area inside the braces.