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# These are functions that examine an XML node and
# defines a class for each complex type.
#
# Need to make this work recursively
#
xmlToS4List =
function(from, class = xmlName(from), type = gsub("s$", "", xmlName(from)))
{
new(class, xmlApply(from, as, type))
}
setGeneric("xmlToS4",
function(node, obj = new(xmlName(node)), ...)
standardGeneric("xmlToS4")
)
setMethod("xmlToS4", "XMLInternalNode",
function(node, obj = new(xmlName(node)), ...)
{
if(is(obj, "character") && !isS4(obj))
obj = new(obj)
# if(xmlSize(node) == 1 && node[[1]])
# return(as())
ids = names(node)
nodes = xmlChildren(node)
obj = addXMLAttributes(obj, xmlAttrs(node, addNamespacePrefix = TRUE))
slotIds = slotNames(obj)
slots = getClass(class(obj))@slots
if(any(duplicated(ids))) {
# experimenting with a different way of doing this.
# Group the nodes with the same names and the process those.
groupedNodes = split(nodes, ids)
ids = intersect(names(groupedNodes), slotIds)
for(i in ids) {
tmp = groupedNodes[[i]]
slot = slots[[i]]
if(length(tmp) > 1) {
val = lapply(tmp, convertNode, slot)
val = if(isAtomicType(slot))
unlist(val)
else
as(val, slot) # may be a specific sub-type of list
} else {
el = tmp[[1]]
val = convertNode(el, slot)
}
slot(obj, i) <- val
}
} else {
# This was the original mechanism but it doesn't handle multiple nodes of the same name.
for(i in seq(along = nodes)) {
if(ids[i] %in% slotIds) {
val = if(slots[[ids[i]]] == "character")
xmlValue(nodes[[i]])
else
tryCatch(as(nodes[[i]], slots[[ids[i]]]),
error = function(e)
xmlToS4(nodes[[i]]))
slot(obj, ids[i]) <- val # xmlToS4(nodes[[i]])
}
# obj = addAttributes(obj, xmlAttrs(nodes[[i]]))
}
}
obj
})
convertNode =
function(el, slot)
{
if(slot == "character")
xmlValue(el)
else
tryCatch(as(el, slot),
error = function(e)
xmlToS4(el))
}
isAtomicType =
#
# check if className refers to a primitive/atomic type
# or not.
function(className)
{
atomicTypes = c("logical", "integer", "numeric", "character")
if(className %in% atomicTypes)
return(TRUE)
k = getClassDef(className)
length(intersect(names(k@contains), atomicTypes)) > 0
}
addXMLAttributes =
function(obj, attrs)
{
slots = getClass(class(obj))@slots
i = match(names(attrs), names(slots))
# handle any namespace prefix
if(any(is.na(i))) {
w = grepl(":", names(attrs)) & is.na(i)
if(any(w))
i[which(w)] = match(gsub(".*:", "", names(attrs)[which(w)]), names(slots))
}
m = i
if(any(!is.na(i))) {
vals = structure(attrs[!is.na(i)], names = names(slots)[i [!is.na(i)] ])
for(i in names(vals))
slot(obj, i) <- as(vals[i], slots[[i]])
}
obj
}
makeClassTemplate =
#
# Get the class representation information to represent the contents of
# an XML node.
#
#
function(xnode, types = character(), default = "ANY", className = xmlName(xnode),
where = globalenv())
{
user.types = types
slots = names(xnode)
types =
xmlSApply(xnode, function(x) {
if(xmlSize(x) == 0)
default
else if(xmlSize(x) == 1 || is(x, "XMLInternalTextNode"))
"character"
else
xmlName(x)
})
names(types) = slots
types[names(xmlAttrs(xnode))] = "character"
if(length(user.types))
types[names(user.types)] = user.types
coerce = sprintf("setAs('XMLAbstractNode', '%s', function(from) xmlToS4(from))", className)
def = if(length(types))
sprintf("setClass('%s',\n representation(%s))", className,
paste(sQuote(names(types)), sQuote(types), sep = " = ", collapse = ",\n\t"))
else
sprintf("setClass('%s')", className)
if(!is.null(where) && !(is.logical(where) && !where)) {
eval(parse(text = def), envir = where)
eval(parse(text = coerce), envir = where)
}
list(name = className, slots = types,
def = def, coerce = coerce)
}
setAs("XMLAbstractNode", "integer",
function(from)
as.integer(xmlValue(from)))
setAs("XMLAbstractNode", "numeric",
function(from)
as.numeric(xmlValue(from)))
setAs("XMLAbstractNode", "character",
function(from)
xmlValue(from))
setAs("XMLAbstractNode", "URL",
function(from)
new("URL", xmlValue(from)))
setAs("XMLAbstractNode", "logical",
function(from)
as.logical(xmlValue(from)))
setAs("XMLAbstractNode", "Date",
function(from)
as.Date(xmlValue(from), "%Y-%m-%d"))
setAs("XMLAbstractNode", "POSIXct",
function(from)
as.POSIXct(strptime(xmlValue(from), "%Y-%m-%d %H:%M:%S")))
makeXMLClasses =
function(doc, omit = character(), eval = FALSE)
{
a = getNodeSet(doc, "//*")
ids = unique(sapply(a, xmlName))
if(length(omit))
ids = setdiff(ids, omit)
lapply(ids, function(id) makeClassTemplate(getNodeSet(doc, sprintf("//%s", id))[[1]], where = eval))
}
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