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Check names to comply to specific rules

Source: R/checkNames.R
checkNames.Rd

Performs various checks on character vectors, usually names.

Usage

checkNames(
  x,
  type = "named",
  subset.of = NULL,
  must.include = NULL,
  permutation.of = NULL,
  identical.to = NULL,
  disjunct.from = NULL,
  what = "names"
)

check_names(
  x,
  type = "named",
  subset.of = NULL,
  must.include = NULL,
  permutation.of = NULL,
  identical.to = NULL,
  disjunct.from = NULL,
  what = "names"
)

assertNames(
  x,
  type = "named",
  subset.of = NULL,
  must.include = NULL,
  permutation.of = NULL,
  identical.to = NULL,
  disjunct.from = NULL,
  what = "names",
  .var.name = vname(x),
  add = NULL
)

assert_names(
  x,
  type = "named",
  subset.of = NULL,
  must.include = NULL,
  permutation.of = NULL,
  identical.to = NULL,
  disjunct.from = NULL,
  what = "names",
  .var.name = vname(x),
  add = NULL
)

testNames(
  x,
  type = "named",
  subset.of = NULL,
  must.include = NULL,
  permutation.of = NULL,
  identical.to = NULL,
  disjunct.from = NULL,
  what = "names"
)

test_names(
  x,
  type = "named",
  subset.of = NULL,
  must.include = NULL,
  permutation.of = NULL,
  identical.to = NULL,
  disjunct.from = NULL,
  what = "names"
)

expect_names(
  x,
  type = "named",
  subset.of = NULL,
  must.include = NULL,
  permutation.of = NULL,
  identical.to = NULL,
  disjunct.from = NULL,
  what = "names",
  info = NULL,
  label = vname(x)
)

Arguments

x

[character || NULL]
Names to check using rules defined via type.

type

[character(1)]
Type of formal check(s) to perform on the names.

unnamed:

Checks x to be NULL.

named:

Checks x for regular names which excludes names to be NA or empty ("").

unique:

Performs checks like with “named” and additionally tests for non-duplicated names.

strict:

Performs checks like with “unique” and additionally fails for names with UTF-8 characters and names which do not comply to R's variable name restrictions. As regular expression, this is “^[.]*[a-zA-Z]+[a-zA-Z0-9._]*$”.

ids:

Same as “strict”, but does not enforce uniqueness.

Note that for zero-length x, all these name checks evaluate to TRUE.

subset.of

[character]
Names provided in x must be subset of the set subset.of.

must.include

[character]
Names provided in x must be a superset of the set must.include.

permutation.of

[character]
Names provided in x must be a permutation of the set permutation.of. Duplicated names in permutation.of are stripped out and duplicated names in x thus lead to a failed check. Use this argument instead of identical.to if the order of the names is not relevant.

identical.to

[character]
Names provided in x must be identical to the vector identical.to. Use this argument instead of permutation.of if the order of the names is relevant.

disjunct.from

[character]
Names provided in x must may not be present in the vector disjunct.from.

what

[character(1)]
Type of name vector to check, e.g. “names” (default), “colnames” or “rownames”.

.var.name

[character(1)]
Name of the checked object to print in assertions. Defaults to the heuristic implemented in vname.

add

[AssertCollection]
Collection to store assertion messages. See AssertCollection.

info

[character(1)]
Extra information to be included in the message for the testthat reporter. See expect_that.

label

[character(1)]
Name of the checked object to print in messages. Defaults to the heuristic implemented in vname.

Value

Depending on the function prefix: If the check is successful, the functions assertNames/assert_names return x invisibly, whereas checkNames/check_names and testNames/test_names return TRUE. If the check is not successful, assertNames/assert_names throws an error message, testNames/test_names returns FALSE, and checkNames/check_names return a string with the error message. The function expect_names always returns an expectation.

See also

Other attributes: checkClass(), checkMultiClass(), checkNamed()

Examples

x = 1:3
testNames(names(x), "unnamed")
#> [1] TRUE
names(x) = letters[1:3]
testNames(names(x), "unique")
#> [1] TRUE

cn = c("Species", "Sepal.Length", "Sepal.Width", "Petal.Length", "Petal.Width")
assertNames(names(iris), permutation.of = cn)