tib_scalar: Create a Field Specification

In tibblify: Rectangle Nested Lists

Create a Field Specification

Description

Use these functions to specify how to convert the fields of an object.

Usage

tib_unspecified(key, ..., required = TRUE)

tib_scalar(
  key,
  ptype,
  ...,
  required = TRUE,
  fill = NULL,
  ptype_inner = ptype,
  transform = NULL
)

tib_lgl(
  key,
  ...,
  required = TRUE,
  fill = NULL,
  ptype_inner = logical(),
  transform = NULL
)

tib_int(
  key,
  ...,
  required = TRUE,
  fill = NULL,
  ptype_inner = integer(),
  transform = NULL
)

tib_dbl(
  key,
  ...,
  required = TRUE,
  fill = NULL,
  ptype_inner = double(),
  transform = NULL
)

tib_chr(
  key,
  ...,
  required = TRUE,
  fill = NULL,
  ptype_inner = character(),
  transform = NULL
)

tib_date(
  key,
  ...,
  required = TRUE,
  fill = NULL,
  ptype_inner = vctrs::new_date(),
  transform = NULL
)

tib_chr_date(key, ..., required = TRUE, fill = NULL, format = "%Y-%m-%d")

tib_vector(
  key,
  ptype,
  ...,
  required = TRUE,
  fill = NULL,
  ptype_inner = ptype,
  transform = NULL,
  elt_transform = NULL,
  input_form = c("vector", "scalar_list", "object"),
  values_to = NULL,
  names_to = NULL
)

tib_lgl_vec(
  key,
  ...,
  required = TRUE,
  fill = NULL,
  ptype_inner = logical(),
  transform = NULL,
  elt_transform = NULL,
  input_form = c("vector", "scalar_list", "object"),
  values_to = NULL,
  names_to = NULL
)

tib_int_vec(
  key,
  ...,
  required = TRUE,
  fill = NULL,
  ptype_inner = integer(),
  transform = NULL,
  elt_transform = NULL,
  input_form = c("vector", "scalar_list", "object"),
  values_to = NULL,
  names_to = NULL
)

tib_dbl_vec(
  key,
  ...,
  required = TRUE,
  fill = NULL,
  ptype_inner = double(),
  transform = NULL,
  elt_transform = NULL,
  input_form = c("vector", "scalar_list", "object"),
  values_to = NULL,
  names_to = NULL
)

tib_chr_vec(
  key,
  ...,
  required = TRUE,
  fill = NULL,
  ptype_inner = character(),
  transform = NULL,
  elt_transform = NULL,
  input_form = c("vector", "scalar_list", "object"),
  values_to = NULL,
  names_to = NULL
)

tib_date_vec(
  key,
  ...,
  required = TRUE,
  fill = NULL,
  ptype_inner = vctrs::new_date(),
  transform = NULL,
  elt_transform = NULL,
  input_form = c("vector", "scalar_list", "object"),
  values_to = NULL,
  names_to = NULL
)

tib_chr_date_vec(
  key,
  ...,
  required = TRUE,
  fill = NULL,
  input_form = c("vector", "scalar_list", "object"),
  values_to = NULL,
  names_to = NULL,
  format = "%Y-%m-%d"
)

tib_variant(
  key,
  ...,
  required = TRUE,
  fill = NULL,
  transform = NULL,
  elt_transform = NULL
)

tib_recursive(.key, ..., .children, .children_to = .children, .required = TRUE)

tib_row(.key, ..., .required = TRUE)

tib_df(.key, ..., .required = TRUE, .names_to = NULL)

Arguments

key, .key	The path to the field in the object.
...	These dots are for future extensions and must be empty.
required, .required	Throw an error if the field does not exist?
ptype	A prototype of the desired output type of the field.
fill	Optionally, a value to use if the field does not exist.
ptype_inner	A prototype of the field.
transform	A function to apply to the whole vector after casting to ptype_inner.
format	Optional, a string passed to the format argument of as.Date().
elt_transform	A function to apply to each element before casting to ptype_inner.
input_form	A string that describes what structure the field has. Can be one of: "vector": The field is a vector, e.g. c(1, 2, 3). "scalar_list": The field is a list of scalars, e.g. list(1, 2, 3). "object": The field is a named list of scalars, e.g. list(a = 1, b = 2, c = 3).
values_to	Can be one of the following: NULL: the default. The field is converted to a ptype vector. A string: The field is converted to a tibble and the values go into the specified column.
names_to	Can be one of the following: NULL: the default. The inner names of the field are not used. A string: This can only be used if 1) for the input form is "object" or "vector" and 2) values_to is a string. The inner names of the field go into the specified column.
.children	A string giving the name of field that contains the children.
.children_to	A string giving the column name to store the children.
.names_to	A string giving the name of the column which will contain the names of elements of the object list. If NULL, the default, no name column is created

Details

There are basically five different ⁠tib_*()⁠ functions

• tib_scalar(ptype): Cast the field to a length one vector of type ptype.

• tib_vector(ptype): Cast the field to an arbitrary length vector of type ptype.

• tib_variant(): Cast the field to a list.

• tib_row(): Cast the field to a named list.

• tib_df(): Cast the field to a tibble.

There are some special shortcuts of tib_scalar() resp. tib_vector() for the most common prototypes

• logical(): tib_lgl() resp. tib_lgl_vec()

• integer(): tib_int() resp. tib_int_vec()

• double(): tib_dbl() resp. tib_dbl_vec()

• character(): tib_chr() resp. tib_chr_vec()

• Date: tib_date() resp. tib_date_vec()

Further, there is also a special shortcut for dates encoded as character: tib_chr_date() resp. tib_chr_date_vec().

Value

A tibblify field collector.

Examples

tib_int("int")
tib_int("int", required = FALSE, fill = 0)

tib_scalar("date", Sys.Date(), transform = function(x) as.Date(x, format = "%Y-%m-%d"))

tib_df(
  "data",
  .names_to = "id",
  age = tib_int("age"),
  name = tib_chr("name")
)

tibblify documentation built on May 29, 2024, 6:36 a.m.