Logical; should a split occur after every character?
split.space
Logical; determines if spaces should be preserved as characters in
the n-gram tokenization. The character(s) used for spaces are
determined by the spacesep argument.
characters.
spacesep
The character(s) to represent a space in the case that
split.space=TRUE. Should not just be a space(s).
split.punct
Logical; determines if splits should occur at punctuation.
Details
Note that choosing split.char=TRUE necessarily implies
split.punct=TRUE as well --- but not necessarily that
split.space=TRUE.