Validation - Character vectors

Usage

test_character(
  x,
  len = NULL,
  n_na = NULL,
  n_dup = NULL,
  n_char = NULL,
  set = NULL,
  match = NULL,
  sorted = NULL,
  sentinels = NULL,
  custom = NULL,
  perl = FALSE
)

assert_character(
  x,
  len = NULL,
  n_na = NULL,
  n_dup = NULL,
  n_char = NULL,
  set = NULL,
  match = NULL,
  sorted = NULL,
  sentinels = NULL,
  custom = NULL,
  perl = FALSE,
  action = "abort",
  env = caller_env(),
  x_name = NULL,
  short_circuit = TRUE,
  report_untested = TRUE,
  args_cnd = list()
)

Arguments

x

[any] An object to test.

len, n_na, n_dup, n_char

[numeric() | \(){} | NULL] Possible values for the length, number of NA elements, number of duplicate elements, number of characters (vectorized). The options of each argument 'arg' are:

• NULL to not test.

• A single non-negative number to test for . == arg. If Inf, . == length(x).

• A single negative number to test for . == length(x) + arg.

• A vector of two non-negative numbers to test for arg[1] <= . <= arg[2] (Inf is allowed).

• A vector of three or more non-negative numbers to test for . %in% arg.

• A function that receives the value to test and the length of x, and returns a single TRUE or FALSE.

set

[character() | list(yes = , no = , mode = ) | NULL] Test if all values of x are in a set of allowed values. Use a list with yes and/or no elements to defined allowed and disallowed values, with modes "all" (all x in yes, the default), "only" (all and only x in yes), or "any" (any x in yes). Set to NULL to not test.

match

[character() | list(yes = , no = ) | NULL] Test if all elements of x match regular expression patterns. Pass a character vector of patterns (implicitly OR'd together), or a list with yes and no character vectors of patterns. Set to NULL to not test.

sorted

["asc" | "desc" | NULL] Test if x is sorted in ascending ("asc") or descending ("desc") order. Set to NULL to not test. Pair with n_dup to test for strictly sorted values.

sentinels

[character() | NULL] Each entry in this character vector allows x to also be some scalar sentinel below. Set to NULL to disconsider sentinels.

• "null" for NULL.

• "empty" for any zero-length object.

• "na" for any NA type, or "na_logical" for NA, "na_integer" for NA_integer_, "na_real" for NA_real_, "na_complex" for NA_complex_, and "na_character" for NA_character_.

• "nan" for NaN.

• "+inf" for +Inf, "-inf" for -Inf, and "inf" for both.

• "true"/"t" for TRUE, and "false"/"f" for FALSE.

custom

[function(x) | NULL] A custom function that takes x as first argument and returns a single TRUE or FALSE. Set to NULL to not test.

perl

[TRUE | FALSE] Should Perl-compatible regexps be used in match?

action

["abort" | "warn" | "inform"] Action to take when the test fails:

• "abort" to stop execution and throw an error.

• "warning" to issue a warning and return invisible(x).

• "message" to issue a message and return invisible(x).

env

[environment() | call() | NULL | missing_arg()] The call to inform as the origin of the error, passed to rlang::abort():

• An environment in the call stack or a hard-coded defused call.

• NULL for no information.

• missing_arg() to use the assert function itself.

• The default is caller_env(), to display the function where the assertion was called.

x_name

[character(1) | NULL] The name of the object to use in the error message. If NULL, the name is inferred from the expression passed to x.

short_circuit

[TRUE | FALSE] If TRUE, the tests results will be reported up to the first failure. Else, all tests results are reported. The former is more efficient, while the latter is more informative.

report_untested

[TRUE | FALSE] If TRUE, the tests that were not run due to short- circuiting will be reported as untested, else, ignored.

args_cnd

[list()] Additional arguments passed to cli::cli_abort(), cli::cli_warn(), or cli::cli_inform(), based on the chosen action.

Value

• [TRUE | FALSE] for test_character().

• [=x] invisible(x) for assert_character(), or aborts if the test fails.

Examples

x <- c("apple", "banana", "cherry", "banana")

args <- list(
  len = c(1, 10),              # Length must be between 1 and 10 (will pass)
  n_na = 0,                    # No NA values allowed (will pass)
  n_dup = 0,                   # No duplicate strings allowed (will fail)
  n_char = c(1, 10),           # Character length of each string between 1 and 10 (will pass)
  set = list(no = c("date")),  # Strings must not contain "date" (will pass)
  match = list(
    yes = "^[a-z]+$",          # All elements must be lowercase letters (will pass)
    no = "x"                   # No element can contain "x" (will pass)
  ),
  sorted = FALSE,              # Don't require vector to be sorted in alphabetical order (will pass)
  sentinels = c("null"),       # Allow NULL x (not the case of x)
  custom = NULL                # No custom predicate
)

do.call(test_character, c(list(x), args)) #> FALSE (not all tests passed)
#> [1] FALSE

try(do.call(assert_character, c(list(x), args))) #> Error
#> Error in eval(expr, envir) : `x` failed `assert_character()`:
#> ✔ (pass) sentinels: no sentinel values allowed.
#> ✔ (pass) type  : must be of type "character".
#> ✔ (pass) len   : length must be in range 1 to 10.
#> ✔ (pass) n_na  : #of NA values must be 0.
#> ✖ (fail) n_dup : #of duplicate values must be 0. Was 1.
#> • (skip) n_char: skiped given failure.
#> • (skip) set   : skiped given failure.
#> • (skip) match : skiped given failure.
#> • (skip) sorted: skiped given failure.
#> 
#> ℹ See `predicater::assert_character()` and this condition's `rs_assert_error`
#>   attribute for details.