/usr/lib/R/site-library/XML/examples/valueFilterDataFrameEvent.R is in r-cran-xml 3.98-1.10-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 | #
# A closure for use with xmlEventParse
# and for reading a data frame using the DatasetByRecord.dtd
# DTD in $OMEGA_HOME/XML/DTDs.
# To test
# xmlEventParse("mtcars.xml", handler())
#
valueDataFrameFilter <- function(accept) {
data <- NULL
# Private or local variables used to store information across
# method calls from the event parser
numRecords <- 0
varNames <- NULL
meta <- NULL
expectingVariableName <- F
rowNames <- NULL
currentColumn <- 1
currentRowName <- NULL
numCols <- 1
# read the attributes from the dataset
dataset <- function(x, atts) {
numRecords <<- as.integer(atts[["numRecords"]])
# store these so that we can put these as attributes
# on data when we create it.
meta <<- atts
}
variables <- function(x, atts) {
# From the DTD, we expect a count attribute telling us the number
# of variables.
# data <<- matrix(0., numRecords, as.integer(atts[["count"]]))
data <<- list()
numCols <- as.integer(atts[["count"]])
# set the XML attributes from the dataset element as R
# attributes of the data.
# attributes(data) <<- meta
}
# when we see the start of a variable tag, then we are expecting
# its name next, so handle text accordingly.
variable <- function(x,...) {
expectingVariableName <<- T
}
record <- function(x,atts) {
currentRowName <<- atts[["id"]]
}
text <- function(x,...) {
if(x == "")
return(NULL)
if(expectingVariableName) {
varNames <<- c(varNames, x)
if(length(varNames) >= numCols) {
expectingVariableName <<- F
#dimnames(data) <<- list(NULL, varNames)
}
} else {
e <- gsub("[ \t]*",",",x)
els <- strsplit(e,",")[[1]]
names(els) <- varNames
if(accept(els)) {
data[[length(data)+1]] <<- els
rowNames <<- c(rowNames, currentRowName)
}
}
}
endElement <- function(x,...) {
if(x == "dataset") {
data <<- data.frame(matrix(unlist(data),length(data),length(varNames), byrow=T))
names(data) <<- varNames
dimnames(data)[[1]] <<- rowNames
} else if(x == "record") {
currentColumn <<- 1
}
}
return(list(variable = variable,
variables = variables,
dataset=dataset,
text = text,
record= record,
endElement = endElement,
data = function() {data },
rowNames = function() rowNames
))
}
|