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#' Get the holdings of a Van Eck ETF
#'
#' Download the names and weights of holdings of Van Eck ETFs (Market Vector ETFs)
#'
#' @param Symbols character vector of Van Eck ETF ticker symbols. Presently,
#' if \code{Symbols} is \code{missing}, all the Market Vectors Symbols found
#' using \code{\link{read.masterDATA}} will be used. However, in the future
#' this may change to require that \code{Symbols} is not \code{missing}
#' @param env environment in which to store holdings data
#' @param auto.assign TRUE/FALSE. If TRUE, the holdings data will be stored in
#' an object that has a name that is he Symbol appended with \dQuote{.h}
#' @return either the names of the objects that contain the holdings if called
#' with \code{auto.assign=TRUE}, or a list of the holdings data. The returned
#' data will be in objects classed as \code{holdings} that are data.frames
#' with Weights (0-100) in the first column, and the Names of the stocks in
#' the second column. The rownames are the the ticker symbols.
#' @author Garrett See
#' @seealso \code{\link{getHoldings}}, \code{\link{getHoldings.SPDR}},
#' \code{\link{getHoldings.iShares}}, \code{\link{getHoldings.powershares}}
#' @references \url{http://www.vaneck.com/}
#' @examples
#' \dontrun{
#' getHoldings.vaneck("GDX")
#' }
#' @export
getHoldings.vaneck <- function(Symbols, env=.GlobalEnv, auto.assign=TRUE) {
if (missing(Symbols)) {
etfs <- read.masterDATA()
etfs[, 1] <- sapply(strsplit(etfs[, 1], " "), "[", 1)
Symbols <- etfs[etfs[["Name"]] == "Market", "Symbol"] #Market Vectors
}
if (length(Symbols) == 0L) { return(NULL) }
hlist <- lapply(Symbols, function(Symbol) {
if (length(Symbols) > 1) {
message(paste("Getting holdings for", Symbol))
}
tmp <- tempfile()
download.file(paste0("http://www.vaneck.com/FundHoldings.aspx?ticker=",
Symbol), destfile=tmp, quiet=TRUE)
tbl <- try(readHTMLTable(tmp, skip.rows=1, header=TRUE,
stringsAsFactors=FALSE)[[1L]], silent=TRUE)
unlink(tmp)
if (inherits(tbl, 'try-error')) { return(NULL) }
if (tbl[1, 1] == "Number") {
colnames(tbl) <- paste(tbl[1, ])
tbl <- tbl[-1, ]
}
if (!any(grepl("WEIGHT|% of net assets", colnames(tbl)))) {
tbl$WEIGHT <- NA
}
out <- data.frame(as.numeric(gsub("%", "",
tbl[, grep("WEIGHT|% of net assets", colnames(tbl))])),
tbl[, grep("Holding|Fund", colnames(tbl))],
stringsAsFactors=FALSE)
colnames(out) <- c(paste(Symbol, "Weight", sep="."), "Name")
rn <- if (any(grepl("Ticker", colnames(tbl)))) {
sapply(strsplit(tbl[["Ticker"]], " "), "[", 1)
} else gsub("[^A-Za-z0-9]", "", tbl[[grep("CUSIP|Bond Identifier",
names(tbl))]])
rn[is.na(rn)] <- "--"
rownames(out) <- make.names(rn, unique=TRUE)
class(out) <- c("holdings", "data.frame")
out
})
names(hlist) <- Symbols
if (isTRUE(auto.assign)) {
sout <- do.call(c, lapply(Symbols, function(x) {
if (!is.null(hlist[[x]])) {
assign(paste(x, "h", sep="."), hlist[[x]], pos=env)
x
}
}))
if (length(sout) > 0){
return(paste(sout, "h", sep="."))
} else return(NULL)
}
if (length(hlist) > 1) {
return(hlist)
} else return(hlist[[1]])
}
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