# 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 node "embed" for RKWard plugins
#'
#' @param component Either a character string, registered name (\code{id} in pluginmap file) of the component to be embedded,
#' or an object of class \code{\link[rkwarddev:rk.plug.comp-class]{rk.plug.comp}}, whose name will be used.
#' @param button Logical, whether the plugin should be embedded as a button and appear if it's pressed.
#' @param label A character string, text label for the button (only used if \code{button=TRUE}).
#' @param namespace An optional character string, XiMpLe node \code{<about>} or XiMpLe doc of doctype "rkpluginmap",
#' to prefix the given \code{component} with the respective namespace (\code{"namespace::component"}).
#' @param id.name Character string, a unique ID for this plugin element.
#' If \code{"auto"}, an ID will be generated automatically from the label and component strings.
#' @param i18n Either a character string or a named list with the optional elements \code{context}
#' or \code{comment}, to give some \code{i18n_context} information for this node. If set to \code{FALSE},
#' the attribute \code{label} will be renamed into \code{noi18n_label}.
#' @return An object of class \code{XiMpLe.node}.
#' @export
#' @seealso \href{help:rkwardplugins}{Introduction to Writing Plugins for RKWard}
#' @examples
#' test.embed <- rk.XML.embed("someComponent")
#' cat(pasteXML(test.embed))
rk.XML.embed <- function(component, button=FALSE, label="Options", namespace=NULL, id.name="auto", i18n=NULL){
# namespace sources:
# - <about>
# - <pluginmap>
if(!is.null(namespace)){
throwError <- FALSE
if(is.XiMpLe.node(namespace)){
if(identical(XMLName(namespace), "about")){
namespace <- XMLAttrs(namespace)[["name"]]
# clean namespace
namespace <- gsub("[^[:alnum:]_]*", "", namespace)
} else {
throwError <- TRUE
}
} else if(is.XiMpLe.doc(namespace)){
if(identical(XMLDTD(namespace)[["doctype"]], "rkpluginmap")){
namespace <- XMLAttrs(node(namespace, node="document"))[["namespace"]]
} else {
throwError <- TRUE
}
} else if(is.character(namespace)){
# clean namespace
namespace <- gsub("[^[:alnum:]_]*", "", namespace)
} else {
throwError <- TRUE
}
if(isTRUE(throwError)){
stop(simpleError("\"namespace\" must be a character string, a XiMpLe.node <about>, or a XiMpLe.doc <pluginmap>!"))
} else {}
namespace <- paste0(namespace, "::")
} else {}
# check the component
if(inherits(component, "rk.plug.comp")){
component <- slot(component, "name")
} else if(is.character(component)){
component <- gsub("[^[:alnum:]_]*", "", component)
} else {
stop(simpleError("\"component\" must be a character string or an object of class \"rk.plug.comp\"!"))
}
attr.list <- list(component=paste0(namespace, component))
if(isTRUE(button)){
attr.list[["as_button"]] <- "true"
} else {}
if(!identical(label, "Options") && isTRUE(button)){
attr.list[["label"]] <- label
} else {}
if(identical(id.name, "auto")){
attr.list[["id"]] <- auto.ids(paste0(label, component), prefix=ID.prefix("embed"))
} else {
attr.list[["id"]] <- id.name
}
# check for additional i18n info; if FALSE, "label" will be renamed to "noi18n_label"
attr.list <- check.i18n(i18n=i18n, attrs=attr.list)
node <- check.i18n(i18n=i18n, node=XMLNode("embed", attrs=attr.list), comment=TRUE)
return(node)
}
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