xlconnect: Excel Connector for R

#############################################################################
#
# 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
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.
#
#############################################################################

#############################################################################
#
# Converts a region such as A10:B20 to the corresponding indices.
# This is a helper function for use in readWorksheet.
# 
# Author: Martin Studer, Mirai Solutions GmbH
#
#############################################################################


rg2idx = function(x) {
	aref2idx(ifelse(regexpr(":", x) > 0, x, paste(x, x, sep = ":")))
}