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/* https://lampsvn.epfl.ch/trac/scala/ticket/2104
symptom: Source via Buffered Source always loses the last char of the input file.
cause: BufferedSource? doesn't check return for -1 (EOF), and uses reader.ready() improperly as a substitute.
test: check over all possible strings of length up to N over alphabet chars:
write file, then read back its chars, and get back the original.
*/
object Test
{
val N=4
import java.io.{ File => JFile }
import java.io.FileWriter
import io.Source
def overwrite(file: JFile,w: FileWriter=>Unit) {
val fw=new FileWriter(file)
w(fw)
fw.close
}
def delete_after(f: JFile,g: Source=>Unit) = {
g(Source.fromFile(f))
f.delete
}
def store_tempfile(f: FileWriter=>Unit)(implicit name:String) : JFile = {
val tp=JFile.createTempFile(name,null)
overwrite(tp,f)
tp
}
implicit val name="t2104"
val chars=List('\n','\r','a')
type Cs = List[Char]
def all_strings(n: Int) : List[Cs] = {
if (n==0) List(Nil)
else {
val sufs=all_strings(n-1)
chars.flatMap((c)=>sufs.map(c :: _))
}
}
def test(n: Int) {
for(l <- all_strings(n)) {
val tmp=store_tempfile((f)=>l.foreach(f.write(_)))
delete_after(tmp,(s)=>assert(s.toList == l))
}
}
def main(args: Array[String]) {
(0 until N).foreach(test(_))
}
}
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