# 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
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