pvsRequest4.1 <-
function (request,inputs) {
pvs.key <- getPVS_key()
pvs.url <- paste("http://api.votesmart.org/",request,"key=",pvs.key,inputs,sep="") #generate url for request
httpresp <- GET(url=pvs.url)
xmltext <- content(x=httpresp, as="text")
errors <- getXMLErrors(xmltext) # check if xml can be parsed properly
if (length(errors) != 0) {
if (names(errors[[1]]$code) == "XML_ERR_CDATA_NOT_FINISHED") { # if not, try to fix
xmltext <- gsub(pattern="\003", replacement="", x=xmltext, fixed=TRUE)
}
}
output.base <- xmlRoot(xmlTreeParse(xmltext, useInternalNodes=TRUE))
if (names(output.base)[1]=="errorMessage") {
# if the requested data is not available, return an empty (NA) data frame and give a warning
warning(gsub(pattern="&", replacement=" ", x=paste("No data available for: ", inputs,". The corresponding rows in the data frame are filled with NAs.", sep=""), fixed=TRUE), call.=FALSE)
output.df <- data.frame(matrix(nrow=1,ncol=0), stringsAsFactors = FALSE)
return(output.df)
} else {
output <- output.base
nodenames <- names(output) # get names of nodes
# remove unnecessary child-nodes
if (nodenames[1]=="generalInfo") {
output <- removeChildren(output,kids="generalInfo")
} else { if (nodenames[1]=="generalinfo") {
output <- removeChildren(output,kids="generalinfo")
}
}
output.df <- data.frame(t(xmlSApply(output,xmlValue)), stringsAsFactors = FALSE)
return(output.df)
}
}
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