assert_all_are_valid_variable_names
Is the string a valid variable name?
Checks strings to see if they are valid variable names.
Usage
assert_all_are_valid_variable_names(x, allow_reserved = TRUE,
allow_duplicates, na_ignore = FALSE,
severity = getOption("assertive.severity", "stop"))assert_any_are_valid_variable_names(x, allow_reserved = TRUE,
allow_duplicates, na_ignore = FALSE,
severity = getOption("assertive.severity", "stop"))
is_valid_variable_name(x, allow_reserved = TRUE, allow_duplicates)
Arguments
- x
Input to check.
- allow_reserved
If
TRUE
then "..." and "..1", "..2", etc. are considered valid.- allow_duplicates
Deprecated and ignored.
- na_ignore
A logical value. If
FALSE
,NA
values cause an error; otherwise they do not. Likena.rm
in many stats package functions, except that the position of the failing values does not change.- severity
How severe should the consequences of the assertion be? Either
"stop"
,"warning"
,"message"
, or"none"
.
Value
The assert_*
functions return nothing but throw an error if the
corresponding is_*
function returns FALSE
.
References
http://4dpiecharts.com/2011/07/04/testing-for-valid-variable-names/
See Also
Examples
# NOT RUN {
make_random_string <- function(n)
{
paste0(sample(letters, n, replace = TRUE), collapse = "")
}
long <- c(make_random_string(10000), make_random_string(10001))
x <- c("x", "y_y0.Y", ".", "x y", "...", "..1", long)
unname(is_valid_variable_name(x))
unname(is_valid_variable_name(x, allow_reserved = FALSE))
#These examples should fail.
assertive.base::dont_stop(
assert_all_are_valid_variable_names(c("...", "..1"), allow_reserved = FALSE)
)
# }