Extract file extension: Difference between revisions
Added Wren
(Added Wren) |
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Line 2,290:
Debug.Assert ExtractFileExtension(s) = ""
End Sub</lang>
=={{header|Wren}}==
{{trans|Kotlin}}
{{libheader|Wren-pattern}}
{{libheader|Wren-fmt}}
<lang ecmascript>import "/pattern" for Pattern
import "/fmt" for Fmt
var p = Pattern.new("/W") // matches any non-alphanumeric character
var extractFileExtension = Fn.new { |path|
if (path.isEmpty) return ""
var fileName = path.split("/")[-1]
if (path == fileName) fileName = path.split("\\")[-1]
var splits = fileName.split(".")
if (splits.count == 1) return ""
var ext = splits[-1]
return p.isMatch(ext) ? "" : "." + ext
}
var paths = [
"http://example.com/download.tar.gz",
"CharacterModel.3DS",
".desktop",
"document",
"document.txt_backup",
"/etc/pam.d/login",
"c:\\programs\\myprogs\\myprog.exe", // using back-slash as delimiter
"c:\\programs\\myprogs\\myprog.exe_backup" // ditto
]
for (path in paths) {
var ext = extractFileExtension.call(path)
Fmt.print("$-37s -> $s", path, ext.isEmpty ? "(empty string)" : ext)
}</lang>
{{out}}
<pre>
http://example.com/download.tar.gz -> .gz
CharacterModel.3DS -> .3DS
.desktop -> .desktop
document -> (empty string)
document.txt_backup -> (empty string)
/etc/pam.d/login -> (empty string)
c:\programs\myprogs\myprog.exe -> .exe
c:\programs\myprogs\myprog.exe_backup -> (empty string)
</pre>
=={{header|zkl}}==
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