R/wrapList.R

In miraisolutions/xlconnect: Excel Connector for R

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#
# XLConnect
# Copyright (C) 2010-2024 Mirai Solutions GmbH
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
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#
# This program is distributed in the hope that it will be useful,
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
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# along with this program.  If not, see <https://www.gnu.org/licenses/>.
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#############################################################################

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#
# Wraps an argument in a list if it not already is a list.
# Further extracts the 'jobj' slot from S4 classes (such as 'workbook'
# and 'cellstyle').
# 
# Author: Martin Studer, Mirai Solutions GmbH
#
#############################################################################

wrapList <- function(x) {
	if(!is(x, "list")) x <- list(x)
	# Extract 'jobj' slot for S4 classes (such as 'workbook' & 'cellstyle')
	x <- lapply(x, function(y) {
		if(!is(y, "jobjRef") && .hasSlot(y, "jobj")) y@jobj
		else y
	})
	x
}