# Copyright 2010-2014 Meik Michalke <meik.michalke@hhu.de>
#
# This file is part of the R package rkwarddev.
#
# rkwarddev 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.
#
# rkwarddev 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 rkwarddev. If not, see <http://www.gnu.org/licenses/>.
#' Create XML copy node for RKWard plugins
#'
#' @param id Either a character string (the \code{id} of the property to be copied),
#' or an object of class \code{XiMpLe.node} (whose \code{id} will be extracted and used).
#' @param as A character string resembling the \code{copy_element_tag_name} value. I.e., must be
#' a valid tag name. Will cause a change of tag name of the \code{id} (e.g. "tab") to \code{as}
#' (e.g. "page").
#' @return An object of class \code{XiMpLe.node}.
#' @export
#' @seealso
#' \code{\link[rkwarddev:rk.XML.plugin]{rk.XML.plugin}},
#' \code{\link[rkwarddev:rk.plugin.skeleton]{rk.plugin.skeleton}},
#' and the \href{help:rkwardplugins}{Introduction to Writing Plugins for RKWard}
#' @examples
#' # define a checkbox for the actual dialog
#' test.cbox1 <- rk.XML.cbox(label="More than 30 subjects", val="true")
#' # define the wizard
#' test.text <- rk.XML.text("Did you test more than 30 subjects?")
#' test.copy <- rk.XML.copy(id=test.cbox1)
#' test.wizard <- rk.XML.wizard(rk.XML.page(list(test.text, test.copy)))
#' cat(pasteXML(test.wizard))
rk.XML.copy <- function(id, as=NULL){
if(length(id) > 1 | length(as) > 1){
stop(simpleError("'id' and 'as' must be of length 1!"))
} else {}
# let's see if we need to extract IDs first
id.name <- check.ID(id)
attr.list <- list(id=id.name)
if(!is.null(as)){
# check the validity
valid.child("as", node.names=as, section="wizard/dialog (copy/'as')")
attr.list[["as"]] <- as.character(as)
} else {}
node <- XMLNode("copy", attrs=attr.list)
return(node)
}
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