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setGeneric("simplifyNamespaces",
function(doc, ...)
standardGeneric("simplifyNamespaces"))
setMethod("simplifyNamespaces", "character",
function(doc, ...) {
pdoc = xmlParseDoc(doc, NSCLEAN)
simplifyNamespaces(pdoc, ...)
})
xmlCleanNamespaces =
#
# @eg xmlParse("~/GitWorkingArea/XML/inst/exampleData/redundantNS.xml")
#
# ?Should we write the result to a file if we are given a file?
#
#
function(doc, options = integer(), out = docName(doc), ...)
{
if(is(doc, "XMLInternalDocument"))
doc = saveXML(doc)
options = unique(c(options, NSCLEAN))
newDoc = xmlParse(doc, ..., options = options)
if(is.logical(out))
out = if(out) docName(doc) else character()
if(is.character(out) && length(out))
saveXML(newDoc, out)
else
newDoc
}
setMethod("simplifyNamespaces", "XMLInternalDocument",
function(doc, alreadyCleaned = FALSE, ...) {
# find all the nodes, but discard the root node.
allNodes = getNodeSet(doc, "//node()") # [-1]
root = xmlRoot(doc)
# For each node, get its namespace definitions,
# and then zoom in on the nodes that have namespace definitions.
nsDefs = lapply(allNodes, xmlNamespaceDefinitions, simplify = TRUE)
w = sapply(nsDefs, length) > 0
tmp = structure(unlist(nsDefs[w]), names = sapply(nsDefs[w], names))
d = data.frame(uri = tmp, prefix = names(tmp), stringsAsFactors = FALSE)
multi = unlist(by(d, d$prefix, function(x) if(length(unique(x$uri)) == 1) character() else x$prefix[1]))
if(length(multi))
d = d[ ! (d$prefix %in% multi), ]
# Now we can move these namespace definitions to the top.
#
#
#
by(d, nsDefs,
function(x) {
u = unique(x$prefix)
})
# remove the
sapply(allNodes[w], removeXMLNamespaces)
nsDefs
})
getNodeNamespace =
# Figure out what namespace to use for this node and return a reference to that
# namespace definition object in C (a xmlNsPtr)
function(ns, nsDefs, node, namespace, noNamespace, namespaceDefinitions = NULL, parent = NULL,
suppressNamespaceWarning = FALSE)
{
if(noNamespace)
return(NULL)
if(is.character(namespace) && length(namespace) == 1L && !is.na(namespace) && namespace == "") {
if(length(namespaceDefinitions) == 0)
return(findNamespaceDefinition(node, ""))
}
if((is.list(namespace) || is.character(namespace)) && length(namespace) > 0) {
# a single element with no name so this is the prefix.
if(length(namespace) == 1 && length(names(namespace)) == 0) {
if(namespace %in% namespaceDefinitions) {
i = match(namespace, namespaceDefinitions)
ns = nsPrefix = names(namespaceDefinitions)[i]
} else if(namespace != "") {
ns = nsPrefix = namespace
}
} else {
# we have names and/or more than one element. So these are namespace definitions
if(length(names(namespace)) == 0)
names(namespace) <- rep("", length(namespace))
if(length(namespace) > 1 && !is.na(match(namespace[1], names(namespace)[-1]))) {
if(length(ns))
warning("ignoring first element of namespace and using prefix from node name, ", ns)
else {
ns = namespace[1]
namespace = namespace[-1]
}
}
if(length(namespace) > 1 && sum(names(namespace) == "") > 1)
warning("more than one namespace to use as the default")
nsDefs = lapply(seq(along = namespace),
function(i) {
prefix = names(namespace)[i]
newNamespace(node, namespace[[i]], prefix)
# Don't set the namespace. This is just a definition/declaration for
# this node, but not necessarily the namespace to use for this node.
# We set this below
})
names(nsDefs) = names(namespace)
}
}
# Now handle the prefix for this node.
if(length(ns)) {
i = match(ns, names(nsDefs))
if(is.na(i)) {
if(!is.null(parent))
ns = findNamespaceDefinition(node, ns)
else {
# raiseNsWarning(ns, suppressNamespaceWarning)
# attr(node, "xml:namespace") = ns
# ns = NULL
ns = newNamespace(node, character(), ns)
}
if(!inherits(ns, "XMLNamespaceRef"))
ns <- newNamespace(node, ns, "")
} else
ns <- nsDefs[[i]]
} else {
i = match("", names(nsDefs))
ns = if(is.na(i)) NULL else nsDefs[[i]]
# if now namespace and we have a parent, use its namespace
# if it has a namespace
if(!noNamespace && length(ns) == 0 && length(parent) > 0) {
ns = xmlNamespaceRef(parent)
if(!is.null(ns) && names(as(ns, "character")) != "")
ns = NULL
}
}
ns
}
raiseNsWarning =
function(ns, suppressNamespaceWarning)
{
if(is.character(suppressNamespaceWarning))
f = get(suppressNamespaceWarning, mode = "function")
else if(is.logical(suppressNamespaceWarning)) {
if(!suppressNamespaceWarning)
f = warning
else
return(NULL)
} else
f = function(...) {}
f("cannot find namespace definition for '", ns, "' because the node is not in a document and there are no matching local namespace definitions for this node")
}
fixDummyNS =
function(node, suppressNamespaceWarning = getOption('suppressXMLNamespaceWarning', FALSE))
{
return(NULL)
nodes = getNodeSet(node, "//*[./namespace::*[. = '<dummy>']]", addFinalizer = FALSE)
lapply(nodes, completeDummyNS, suppressNamespaceWarning = suppressNamespaceWarning)
}
completeDummyNS =
function(node, suppressNamespaceWarning = getOption('suppressXMLNamespaceWarning', FALSE))
{
if(is.null(xmlParent(node)))
return(FALSE)
prefix = names(xmlNamespace(node))
ns = findNamespaceDefinition(xmlParent(node), prefix, error = FALSE)
if(is.null(ns))
raiseNsWarning(prefix, suppressNamespaceWarning)
# (if(suppressNamespaceWarning) warning else stop)("can't find namespace definition for prefix ", prefix)
else {
# remove the current namespace definition and kill it.
.Call("R_replaceDummyNS", node, ns, prefix, PACKAGE = "XML")
# setXMLNamespace(node, ns)
}
}
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