R/zzz.R

In charlatan: Make Fake Data

pluck <- function(x, name, type) {
  if (missing(type)) {
    lapply(x, "[[", name)
  } else {
    vapply(x, "[[", name, FUN.VALUE = type)
  }
}

pluck_names <- function(x, y) {
  strtrim(strxt(x, paste0(names(y), collapse = "|"))[[1]])
}

strxt <- function(string, pattern) {
  regmatches(string, gregexpr(pattern, string))
}

strtrim <- function(str) gsub("^\\s+|\\s+$", "", str)

assert <- function(x, y) {
  if (!is.null(x)) {
    if (!inherits(x, y)) {
      stop(deparse(substitute(x)), " must be of class ",
        paste0(y, collapse = ", "),
        call. = FALSE
      )
    }
  }
}

parse_eval <- function(x, y, messy = FALSE) {
  strg <- if (messy) paste0(x, tolower(y), "_messy") else paste0(x, tolower(y))
  res <- tryCatch(
    eval(parse(text = strg)),
    error = function(E) E
  )
  if (inherits(res, "error")) {
    NULL
  } else {
    res
  }
}

rep_licate <- function(n, expr, type) {
  vapply(integer(n), eval.parent(substitute(function(...) expr)), type)
}

# test if an input has probabilities associated with character strings
has_probs <- function(x) {
  is.list(x) && is.numeric(x[[1]])
}

check4pkg <- function(x) {
  if (!requireNamespace(x, quietly = TRUE)) {
    stop("Please install ", x, call. = FALSE)
  } else {
    invisible(TRUE)
  }
}

`%||%` <- function(x, y) if (is.null(x)) y else x