is_rcell_format: Check if a format is a valid rcell format
Description
Check if a format is a valid rcell format
Usage
is_rcell_format(x, stop_otherwise = FALSE)
Arguments
x
either format string or an object returned by sprintf_format
stop_otherwise
logical, if x
is not a format should an error be
thrown
Value
TRUE
if x
is NULL
, a supported format string, or a function; FALSE
otherwise.