R Under development (unstable) (2023-11-16 r85542 ucrt) -- "Unsuffered Consequences"
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> library("R.utils")
Loading required package: R.oo
Loading required package: R.methodsS3
R.methodsS3 v1.8.2 (2022-06-13 22:00:14 UTC) successfully loaded. See ?R.methodsS3 for help.
R.oo v1.25.0 (2022-06-12 02:20:02 UTC) successfully loaded. See ?R.oo for help.

Attaching package: 'R.oo'

The following object is masked from 'package:R.methodsS3':

    throw

The following objects are masked from 'package:methods':

    getClasses, getMethods

The following objects are masked from 'package:base':

    attach, detach, load, save

R.utils v2.12.3 successfully loaded. See ?R.utils for help.

Attaching package: 'R.utils'

The following object is masked from 'package:utils':

    timestamp

The following objects are masked from 'package:base':

    cat, commandArgs, getOption, isOpen, nullfile, parse, warnings

> 
> assertEqual <- function(a, b) {
+   a <- gsub("\\", "/", a, fixed=TRUE)
+   b <- gsub("\\", "/", b, fixed=TRUE)
+   if (a != b) {
+     throw("The two paths/pathnames differ: ", sQuote(a), " != ", sQuote(b))
+   }
+ } # assertEqual()
> 
> 
> path <- file.path("foo", "bar", "..", "name")
> assertEqual(path, "foo/bar/../name")
> 
> path <- filePath("foo", "bar", "..", "name")
> assertEqual(path, "foo/name")
> 
> path <- filePath("foo/bar/../name")
> assertEqual(path, "foo/name")
> 
> path <- filePath(".")
> assertEqual(path, ".")
> 
> path <- filePath("..")
> assertEqual(path, "..")
> 
> path <- filePath("../..")
> assertEqual(path, "../..")
> 
> path <- filePath("./.")
> assertEqual(path, ".")
> 
> path <- filePath(".", ".")
> assertEqual(path, ".")
> 
> path <- filePath(".", "..")
> assertEqual(path, "..")
> 
> path <- filePath("C:/foo/..")
> assertEqual(path, "C:/")
> 
> path <- filePath("/tmp/../../..")
> assertEqual(path, "/../..")
> 
> path <- filePath("C:/../../..")
> assertEqual(path, "C:/../../..")
> 
> 
> 
> 
> proc.time()
   user  system elapsed 
   0.34    0.10    0.42