assertive (version 0.2-1)

assert_all_are_valid_variable_names: Is the string a valid variable name?

Description

Checks strings to see if they are valid variable names.

Usage

assert_all_are_valid_variable_names(x, allow_reserved = TRUE,
  allow_duplicates)

assert_any_are_valid_variable_names(x, allow_reserved = TRUE,
  allow_duplicates)

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. 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

make.names.

Examples

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)
is_valid_variable_name(x)
is_valid_variable_name(x, allow_reserved = FALSE)
#These examples should fail.
dont_stop(assert_all_are_valid_variable_names(c("...", "..1"), allow_reserved = FALSE))