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case class RS(self: String) {
// NB. "\\Q" + '\\' + "\\E" works on Java 1.5 and newer, but not on Java 1.4
private def escape(ch: Char): String = ch match {
case '\\' => "\\\\"
case _ => "\\Q"+ch+"\\E"
}
def split(separator: Char): Array[String] = self.split(escape(separator))
def split(separators: Array[Char]): Array[String] = {
val re = separators.foldLeft("[")(_+escape(_)) + "]"
self.split(re)
}
}
object Test {
def expect = List("a","b")
def test(f: => Array[String], which: String) {
try {
val ret = f.toList
if (ret != expect)
println(which + " returned " + ret + " when expecting " + expect)
else
println(ret)
} catch {
case e: Throwable => println(which + " failed with " + e.getClass)
}
}
def main(args: Array[String]) {
val badChars = "?*{+([\\^.$"
for (c <- badChars)
test(("a"+c+"b").split(c),"RichString split('"+ c + "')")
println
for (c <- badChars)
test(RS("a"+c+"b").split(c),"RS split('"+ c + "')")
println
val badCases = List(
']' -> "x]", '&' -> "&&",'\\' -> "\\x", '[' -> "[x",
'^' -> "^x", '-' -> "x-z"
)
for ((c,str) <- badCases)
test(("a"+c+"b").split(str.toArray),"RichString split(\""+ str + "\")")
println
for ((c,str) <- badCases)
test(RS("a"+c+"b").split(str.toArray),"RS split(\""+ str + "\")")
}
}
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