New condition — new_condition • fuj

Template for a new condition. See more at base::conditions

Usage

new_condition(
  msg = "",
  class = NULL,
  call = NULL,
  type = c("error", "warning", NA_character_),
  message = msg,
  pkg = package()
)

Arguments

msg, message: A message to print
class: Character string of a single condition class
call: A call expression
type: The type (additional class) of condition: either error", "warning" or NA, which is treated as NULL
pkg: Control or adding package name to condition. If TRUE will try to get the current package name (via .packageName) from, presumably, the developmental package. If FALSE, no package name is prepended to the condition class as a new class. Otherwise, a package can be explicitly set with a single length character.

Value

A condition with the classes specified from class and type

Details

The use of .packageName when pkg = TRUE may not be valid during active development. When the attempt to retrieve the .packageName object is unsuccessful, the error is quietly ignored. However, this should be successful once the package is build and functions can then utilize this created object.

Examples

# empty condition
x <- new_condition("informative error message", class = "foo")
try(stop(x))
#> Error : <fooError> informative error message
#> package:fuj

# with pkg
x <- new_condition("msg", class = "foo", pkg = "bar")
# class contains multiple identifiers, including a "bar:fooError"
class(x)
#> [1] "fujCondition" "bar:fooError" "fooError"     "error"        "condition"   
# message contains package information at the end
try(stop(x))
#> Error : <fooError> msg
#> package:bar