###########################################################################/**
# @RdocDefault isAbsolutePath
#
# @title "Checks if this pathname is absolute"
#
# \description{
# @get "title".
# }
#
# @synopsis
#
# \arguments{
# \item{pathname}{A @character string of the pathname to be checked.}
# \item{...}{Not used.}
# }
#
# \value{
# Returns a @TRUE if the pathname is absolute, otherwise @FALSE.
# }
#
#
#
# @author
#
# @keyword IO
# @keyword programming
#*/###########################################################################
setMethodS3("isAbsolutePath", "default", function(pathname, ...) {
# Argument 'pathname':
pathname <- as.character(pathname)
# BACKWARD COMPATIBILITY: Treat empty path specially?
pathname <- .getPathIfEmpty(pathname, where="isAbsolutePath")
nPathnames <- length(pathname)
# Nothing to do?
if (nPathnames == 0L) return(logical(0L))
# Multiple path to be checked?
if (nPathnames > 1L) {
res <- sapply(pathname, FUN=isAbsolutePath, ...)
return(res)
}
# A missing pathname?
if (is.na(pathname)) return(FALSE)
# Recognize '~' paths
if (regexpr("^~", pathname) != -1L)
return(TRUE)
# Windows paths
if (regexpr("^.:(/|\\\\)", pathname) != -1L)
return(TRUE)
# Split pathname...
components <- strsplit(pathname, split="[/\\]")[[1L]]
if (length(components) == 0L)
return(FALSE)
(components[1L] == "")
})
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