R/select.R

In bioRad: Biological Analysis and Visualization of Weather Radar Data

# generalizations for the dplyr verb `select` to `scan` and `pvol` objects
select.scan <- function(.data, ...) {
  if (!requireNamespace("dplyr", quietly = TRUE)) {
    stop("package dplyr required, please install it first") # nocov
  } #
  if (!requireNamespace("rlang", quietly = TRUE)) {
    stop("package rlang required, please install it first") # nocov
  } #
  if (!requireNamespace("tidyselect", quietly = TRUE)) {
    stop("package tidyselect required, please install it first") # nocov
  } #
  expr <- rlang::expr(c(...))
  pos <- tidyselect::eval_select(expr, data = .data$params)
  .data$params <- rlang::set_names(.data$params[pos], names(pos))
  .data
}

select.pvol <- function(.data, ...) {
  .data$scans <- lapply(.data$scans, select.scan, ...)
  .data
}

register_all_s3_methods <- function() {
  # nocov start
  register_s3_method("dplyr", "select", "scan")
  register_s3_method("dplyr", "select", "pvol")
  # nocov end
}

# from: https://github.com/r-spatial/stars/blob/master/R/tidyverse.R
# from: https://github.com/tidyverse/hms/blob/master/R/zzz.R
# Thu Apr 19 10:53:24 CEST 2018
# nocov start
register_s3_method <- function(pkg, generic, class, fun = NULL) {
  stopifnot(is.character(pkg), length(pkg) == 1)
  stopifnot(is.character(generic), length(generic) == 1)
  stopifnot(is.character(class), length(class) == 1)

  if (is.null(fun)) {
    fun <- get(paste0(generic, ".", class), envir = parent.frame())
  } else {
    stopifnot(is.function(fun))
  }

  if (pkg %in% loadedNamespaces()) {
    registerS3method(generic, class, fun, envir = asNamespace(pkg))
  }

  # Always register hook in case package is later unloaded & reloaded
  setHook(
    packageEvent(pkg, "onLoad"),
    function(...) {
      registerS3method(generic, class, fun, envir = asNamespace(pkg))
    }
  )
}
# nocov end