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