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#'@description Recursive function to restructure objects so
#' xml2::as_xml_document() function will convert them to the desired XML format
#'@param object An object (so far works for r2ogs6 class objects, strings,
#' numbers, lists and vectors)
#'@param object_name Optional: The object name. If not supplied, this function
#' will try to guess the tag name by deparsing the 'object' parameter
#'@param attribute_names Optional: A character vector containing names of
#' attributes or attribute nodes
#'@param flatten_on_exp Optional: This is for vectors which will be flattened
#' to a string in XML
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to_node <- function(object, object_name = "",
attribute_names = character(),
flatten_on_exp = character()){
assertthat::assert_that(is.character(attribute_names))
assertthat::assert_that(is.character(flatten_on_exp))
if(is.null(object_name) || object_name == ""){
object_name <- deparse(substitute(object))
if(any(grep("\\$", object_name))){
object_name <- unlist(strsplit(object_name, "$", fixed = TRUE))[[2]]
}
}
#Recursion ends here
if(assertthat::is.string(object) ||
assertthat::is.number(object) ||
(is.vector(object) &&
(object_name %in% flatten_on_exp ||
object_name %in% attribute_names))){
if(object_name %in% flatten_on_exp){
ret_list <- list(list(paste(object, collapse = " ")))
names(ret_list)[[1]] <- object_name
return(invisible(ret_list))
}
if(object_name %in% attribute_names){
if(length(object) > 1){
attr_node <- list(structure(list()))
names(attr_node)[[1]] <- object_name
for(i in seq_len(length(object))){
attr(attr_node[[1]], names(object)[[i]]) <- object[[i]]
}
return(invisible(attr_node))
}
ret_vect <- c(object)
names(ret_vect)[[1]] <- object_name
return(invisible(ret_vect))
}else{
ret_list <- list(list(object))
names(ret_list)[[1]] <- object_name
return(invisible(ret_list))
}
}
#For r2ogs6 classes, we need recursion
if(any(grepl("r2ogs6_", class(object), fixed = TRUE))){
class_name <- class(object)[[1]]
param_names <- names(as.list(formals(paste0("new_", class_name))))
object_node <- list(structure(list()))
names(object_node)[[1]] <- get_class_tag_name(class_name)
for(i in seq_len(length(param_names))){
get_param_call <- paste0("object$", param_names[[i]])
param_value <- eval(parse(text = get_param_call))
if(is.null(param_value)){
next
}
param_node <- to_node(param_value,
param_names[[i]],
object$attr_names,
object$flatten_on_exp)
#Handle depending on if it's a child or attribute
if(is.list(param_node)){
object_node[[1]][[length(object_node[[1]])+1]] <-
param_node
attr(object_node[[1]], names(param_node)[[1]]) <-
param_node[[1]]
}
}
return(invisible(object_node))
}
if(is.list(object) || is.vector(object)){
object_node <- list(structure(list()))
names(object_node)[[1]] <- object_name
for(i in seq_len(length(object))){
element_node <- to_node(object[[i]],
names(object)[[i]],
attribute_names)
object_node[[1]] <- c(object_node[[1]], element_node)
}
return(invisible(object_node))
}