R/assert.R

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#' @importFrom assertthat assert_that is.string

is_package_name <- function(string) {
  assert_that(is.string(string))
  grepl("^[0-9a-zA-Z._]*$", string)
}

#' @importFrom assertthat  "on_failure<-"

on_failure(is_package_name) <- function(call, env) {
  paste0(deparse(call$x), " is not a valid package name")
}

#' @importFrom assertthat assert_that is.string

is_package_version <- function(string) {
  assert_that(is.string(string))
  grepl("^[0-9a-zA-Z._]*$", string)
}

#' @importFrom assertthat  "on_failure<-"

on_failure(is_package_version) <- function(call, env) {
  paste0(deparse(call$x), " is not a valid (package or R) version")
}