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###########################################################################/**
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# @RdocDefault splitUrl
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#
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# @title "Decomposes a URL into its components"
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#
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# \description{
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# @get "title".
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# }
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#
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# @synopsis
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#
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# \arguments{
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# \item{url}{A @character string.}
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# \item{...}{Not used.}
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# }
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#
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# \value{
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# Returns a named @list of URL components.
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# }
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#
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# @author
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#
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# \references{
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# [1] \url{https://www.wikipedia.org/wiki/URI_scheme}
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# }
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#
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# @keyword IO
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# @keyword programming
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# @keyword internal
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#*/###########################################################################
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setMethodS3("splitUrl", "default", function(url, ...) {
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# Argument 'url':
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url <- Arguments$getCharacter(url, asGString=FALSE)
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if (length(url) == 0L) {
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return(NULL)
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}
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if (!hasUrlProtocol(url)) {
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throw("Can not split URL. Not a valid URL: ", url)
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}
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# Get the protocol
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pattern <- "^([abcdefghijklmnopqrstuvwxyz]+)(://)(.*)"
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protocol <- gsub(pattern, "\\1", url, ignore.case=TRUE)
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tail <- gsub(pattern, "\\3", url, ignore.case=TRUE)
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host <- NULL
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path <- NULL
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query <- NULL
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fragment <- NULL
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parameters <- NULL
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# Get the host
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parts <- strsplit(tail, split="/", fixed=TRUE)[[1L]]
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if (length(parts) > 0L) {
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host <- parts[1L]
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tail <- paste(parts[-1L], collapse="/")
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# Get the path
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parts <- strsplit(tail, split="?", fixed=TRUE)[[1L]]
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if (length(parts) > 0L) {
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path <- parts[1L]
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tail <- paste(parts[-1L], collapse="/")
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# Get the query and fragment
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parts <- strsplit(tail, split="#", fixed=TRUE)[[1L]]
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query <- parts[1L]
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fragment <- paste(parts[-1L], collapse="#")
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# Get the parameters
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parts <- strsplit(query, split="&", fixed=TRUE)[[1L]]
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if (length(parts) > 0L) {
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parts <- strsplit(parts, split="=", fixed=TRUE)
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if (length(parts) > 0L) {
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names <- unlist(lapply(parts, FUN=function(x) x[1L]), use.names=FALSE)
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parameters <- lapply(parts, FUN=function(x) paste(x[-1L], collapse="="))
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names(parameters) <- names
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}
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}
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}
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}
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list(protocol=protocol, host=host, path=path,
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query=query, fragment=fragment, parameters=parameters)
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})
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HenrikBengtsson