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utils.R
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utils.R
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# Unexported usefull functions from shiny
# dropNulls
dropNulls <- function (x)
{
x[!vapply(x, is.null, FUN.VALUE = logical(1))]
}
# choicesWithNames
choicesWithNames <- function (choices)
{
listify <- function(obj) {
makeNamed <- function(x) {
if (is.null(names(x)))
names(x) <- character(length(x))
x
}
res <- lapply(obj, function(val) {
if (is.list(val))
listify(val)
else if (length(val) == 1 && is.null(names(val)))
val
else makeNamed(as.list(val))
})
makeNamed(res)
}
choices <- listify(choices)
if (length(choices) == 0)
return(choices)
choices <- mapply(choices, names(choices), FUN = function(choice,
name) {
if (!is.list(choice))
return(choice)
if (name == "")
stop("All sub-lists in \"choices\" must be named.")
choicesWithNames(choice)
}, SIMPLIFY = FALSE)
missing <- names(choices) == ""
names(choices)[missing] <- as.character(choices)[missing]
choices
}
# needOptgroup
needOptgroup <- function (choices)
{
any(vapply(choices, is.list, logical(1)))
}
# validateSelected
validateSelected <- function (selected, choices, inputId)
{
selected <- unname(selected)
if (needOptgroup(choices))
return(selected)
if (is.list(choices))
choices <- unlist(choices)
nms <- names(choices)
if (identical(nms, unname(choices)))
return(selected)
i <- (selected %in% nms) & !(selected %in% choices)
if (any(i)) {
warnFun <- if (all(i)) {
selected <- unname(choices[selected])
warning
}
else stop
warnFun("'selected' must be the values instead of names of 'choices' ",
"for the input '", inputId, "'")
}
selected
}
`%AND%` <- function (x, y)
{
if (!is.null(x) && !is.na(x))
if (!is.null(y) && !is.na(y))
return(y)
return(NULL)
}
`%||%` <- function(x, y) {
if (!is.null(x)) x else y
}
escape_jquery <- function(string) {
gsub(x = string, pattern = "(\\W)", replacement = "\\\\\\\\\\1")
}
firstChoice <- function (choices)
{
if (length(choices) == 0L)
return()
choice <- choices[[1]]
if (is.list(choice))
firstChoice(choice)
else choice
}
anyNamed <- function (x) {
if (length(x) == 0)
return(FALSE)
nms <- names(x)
if (is.null(nms))
return(FALSE)
any(nzchar(nms))
}
normalizeChoicesArgs <- function (choices, choiceNames, choiceValues, mustExist = TRUE) {
if (is.null(choices)) {
if (is.null(choiceNames) || is.null(choiceValues)) {
if (mustExist) {
stop("Please specify a non-empty vector for `choices` (or, ",
"alternatively, for both `choiceNames` AND `choiceValues`).")
}
else {
if (is.null(choiceNames) && is.null(choiceValues)) {
return(list(choiceNames = NULL, choiceValues = NULL))
}
else {
stop("One of `choiceNames` or `choiceValues` was set to ",
"NULL, but either both or none should be NULL.")
}
}
}
if (length(choiceNames) != length(choiceValues)) {
stop("`choiceNames` and `choiceValues` must have the same length.")
}
if (anyNamed(choiceNames) || anyNamed(choiceValues)) {
stop("`choiceNames` and `choiceValues` must not be named.")
}
}
else {
if (!is.null(choiceNames) || !is.null(choiceValues)) {
warning("Using `choices` argument; ignoring `choiceNames` and `choiceValues`.")
}
choices <- choicesWithNames(choices)
choiceNames <- names(choices)
choiceValues <- unname(choices)
}
return(list(choiceNames = as.list(choiceNames), choiceValues = as.list(as.character(choiceValues))))
}
validateIcon <- function (icon)
{
if (is.null(icon) || identical(icon, character(0))) {
return(icon)
}
else if (inherits(icon, "shiny.tag") && icon$name == "i") {
return(icon)
}
else {
stop("Invalid icon. Use Shiny's 'icon()' function to generate a valid icon")
}
}