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setClass("XMLOutputStream", "namedList")
setClass("XMLOutputDOM", contains = "XMLOutputStream")
setClass("XMLOutputBuffer", contains = "XMLOutputStream")
setClass("XMLInternalDOM", contains = "XMLOutputStream")
xmlOutputDOM <-
function(tag = "doc", attrs = NULL, dtd = NULL, nameSpace = NULL, nsURI = character(0),
xmlDeclaration = NULL)
{
buf <- NULL
current <- NULL
startingNode = 1
if(is.logical(xmlDeclaration) && xmlDeclaration)
xmlDeclaration = xmlPINode("xml", 'version = "1.0"')
else if(is.character(xmlDeclaration)) {
if(length(grep('version *=', xmlDeclaration)) == 0)
xmlDeclaration = paste(xmlDeclaration, "version='1.0'")
xmlDeclaration = xmlPINode("xml", xmlDeclaration)
}
if(length(dtd))
dtd = paste("<!DOCTYPE", tag, "SYSTEM", ddQuote(dtd[1]), if(length(dtd) > 1) paste("PUBLIC", ddQuote(dtd[2])), ">")
reset <-
function() {
buf <<- xmlNode(tag, attrs = attrs, namespace = nameSpace)
if(length(nsURI) > 0) {
names(nsURI) <- paste("xmlns", names(nsURI), sep=":")
buf$attributes <<- nsURI
}
current <<- integer(0)
invisible(buf)
}
reset()
addTag <-
function(tag, ..., attrs=NULL, close=TRUE, namespace=NULL, .children = list(...)) {
if(missing(namespace))
namespace <- nameSpace
addNode(n <- xmlNode(tag, attrs= attrs, namespace = namespace, .children = .children))
if(close == FALSE) {
current <<- c(current, xmlSize(getCurrent()))
}
invisible(n)
}
getCurrentExpr <-
function() {
if(length(current) > 0) {
p <- seq(2, length=length(current)-1)
kall <- call("[[", as.name("buf"), current[1])
for(i in p) {
kall <- call("[[", kall, current[i])
}
} else
kall <- as.name("buf")
kall
}
getCurrent <- function() {
eval(getCurrentExpr())
}
# We want to append this to the currently open (or active)
# node as defined by `current'
# d[[1]] <- append.xmlNode(d[[1]], xmlNode("phone"))
addNode <-
function(node) {
kall <- getCurrentExpr()
if(length(current) > 0){
lhs <- kall
kall <- call("append.xmlNode", kall, node)
kall <- call("<<-", lhs, kall)
} else {
kall <- call("append.xmlNode", kall, node)
}
val <- eval(kall)
if(length(current) == 0)
buf <<- val
invisible(node)
}
addComment <- function(...) {
addNode(xmlCommentNode(paste(sapply(list(...), as.character), sep="")))
}
addCData <- function(text) {
addNode(xmlCDataNode(text))
}
addPI <- function(name, text) {
addNode(xmlPINode(name, text))
}
addText <- function(text, namespace = "") {
addNode(xmlTextNode(text, namespace))
}
closeTag <-
function(name="", namespace=NULL) {
# namespace is ignored since we already have the tag name!
current <<- current[-length(current)]
}
getValue =
function() {
# Add DOCTYPE if we have a dtd.
if(!is.null(xmlDeclaration))
structure(list(xmlDeclaration = xmlDeclaration, root = buf, doctype = dtd), class = "XMLRDocument")
else
buf
}
con <- list( value= getValue,
addTag = addTag,
addEndTag = function(name){ closeTag(name)},
closeTag = closeTag,
reset = reset,
addNode = addNode,
add = function(...) {},
addComment = addComment,
addPI = addPI,
addCData = addCData,
current = function(){current}
)
#class(con) <- c("XMLOutputDOM", "XMLOutputStream")
# con
ans = new("XMLOutputDOM", con)
names(ans) = names(con)
ans
}
xmlRoot.XMLRDocument =
function(x, skip = TRUE, ...)
x$root
print.XMLRDocument =
function(x, ...)
{
if(!is.null(x$xmlDeclaration))
print(x$xmlDeclaration)
if(!is.null(x$doctype))
cat(x$doctype, "\n")
print(x$root, ...)
}
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