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#' Condition classes
#'
#' Error, warning, and message classes derived from their simple equivalents.
#' @param message A string describing the problem.
#' @param call A call describing the source of the condition.
#' @param predicate_name A string naming the predicate that was called when the
#' condition occured.
#' @return An object of class \code{assertionError}, \code{assertionWarning}, or
#' \code{assertionMessage}.
#' @note These objects behave the same as the standard-issue \code{simpleError},
#' \code{simpleWarning}, and \code{simpleMessage} objects from base-R. The
#' extra class allows you to provide custom handling for assertions inside
#' \code{tryCatch}.
#' @examples
#' tryCatch(
#' assert_all_are_true(FALSE),
#' error = function(e)
#' {
#' if(inherits(e, "assertionCondition"))
#' {
#' # Handle assertions
#' message("This is an assertion condition.")
#'
#' # Handle assertions cause by a specific predicate
#' if(e$predicate_name == "is_true")
#' {
#' }
#' } else
#' {
#' # Handle other error types
#' }
#' }
#' )
#' @export
assertionError <- function(message, call = NULL, predicate_name = NULL)
{
aerr <- list(
message = as.character(message),
call = call,
predicate_name = predicate_name
)
class(aerr) <- c(
"assertionError", "assertionCondition",
"simpleError", "error", "condition"
)
aerr
}
#' @rdname assertionError
#' @export
assertionWarning <- function(message, call = NULL, predicate_name = NULL)
{
awrn <- list(
message = as.character(message),
call = call,
predicate_name = predicate_name
)
class(awrn) <- c(
"assertionWarning", "assertionCondition",
"simpleWarning", "warning", "condition"
)
awrn
}
#' @rdname assertionError
#' @export
assertionMessage <- function(message, call = NULL, predicate_name = NULL)
{
amsg <- list(
message = as.character(message),
call = call,
predicate_name = predicate_name
)
class(amsg) <- c(
"assertionMessage", "assertionCondition",
"simpleMessage", "message", "condition"
)
amsg
}
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