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saxHandlers =
function()
{
tracks = list()
dictLevel = 0L
key = NA
value = character()
track = list()
text = function(val) {
value <<- paste(value, val, sep = "")
}
startElement =
function(name, attrs) {
if(name %in% c("integer", "string", "date", "key"))
value <<- character()
if(name == "dict")
dictLevel <<- dictLevel + 1L
}
convertValue =
function(value, textType) {
switch(textType,
integer = as.numeric(value),
string = value,
date = as.POSIXct(strptime(value, "%Y-%m-%dT%H:%M:%S")),
default = value)
}
endElement = function(name) {
if(name %in% c("integer", "string", "date"))
track[[key]] <<- convertValue(value, name)
else if(name == "key")
key <<- value
else if(name == "dict" && dictLevel == 3) {
class(track) = "iTunesTrackInfo"
tracks[[ length(tracks) + 1]] <<- track
track <<- list()
dictLevel <<- 2
}
}
list(startElement = startElement, endElement = endElement, text = text, tracks = function() tracks)
}
h = saxHandlers()
#xmlEventParse(path.expand(fileName), handlers = h)
# 5.9 seconds. But this is parsing and processing into tracks.
# system.time({dd = xmlEventParse(path.expand(fileName), handlers = h, addContext = FALSE)})
# 5.93 seconds on average (SD of .09)
# sax = replicate(10, system.time({dd = xmlEventParse(path.expand(fileName), handlers = h, addContext = FALSE)}))
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