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package scala.io
import org.junit.Test
import org.junit.Assert._
import org.junit.runner.RunWith
import org.junit.runners.JUnit4
import scala.tools.testing.AssertUtil._
import java.io.{ Console => _, _ }
@RunWith(classOf[JUnit4])
class SourceTest {
private implicit val `our codec` = Codec.UTF8
private val charSet = Codec.UTF8.charSet.name
private def sampler = """
|Big-endian and little-endian approaches aren't
|readily interchangeable in general, because the
|laws of arithmetic send signals leftward from
|the bits that are "least significant."
|""".stripMargin.trim
private def in = new ByteArrayInputStream(sampler.getBytes)
@Test def canIterateLines() = {
assertEquals(sampler.lines.size, (Source fromString sampler).getLines.size)
}
@Test def canCustomizeReporting() = {
class CapitalReporting(is: InputStream) extends BufferedSource(is) {
override def report(pos: Int, msg: String, out: PrintStream): Unit = {
out print f"$pos%04x: ${msg.toUpperCase}"
}
class OffsetPositioner extends Positioner(null) {
override def next(): Char = {
ch = iter.next()
pos = pos + 1
ch
}
}
withPositioning(new OffsetPositioner)
}
val s = new CapitalReporting(in)
// skip to next line and report an error
do {
val c = s.next()
} while (s.ch != '\n')
s.next()
val out = new ByteArrayOutputStream
val ps = new PrintStream(out, true, charSet)
s.reportError(s.pos, "That doesn't sound right.", ps)
assertEquals("0030: THAT DOESN'T SOUND RIGHT.", out.toString(charSet))
}
@Test def canAltCustomizeReporting() = {
class CapitalReporting(is: InputStream)(implicit codec: Codec) extends Source {
override val iter = {
val r = new InputStreamReader(is, codec.decoder)
Iterator continually (codec wrap r.read()) takeWhile (_ != -1) map (_.toChar)
}
override def report(pos: Int, msg: String, out: PrintStream): Unit = {
out print f"$pos%04x: ${msg.toUpperCase}"
}
private[this] var _pos: Int = _
override def pos = _pos
private[this] var _ch: Char = _
override def ch = _ch
override def next = {
_ch = iter.next()
_pos += 1
_ch
}
}
val s = new CapitalReporting(in)
// skip to next line and report an error
do {
val c = s.next()
} while (s.ch != '\n')
s.next()
val out = new ByteArrayOutputStream
val ps = new PrintStream(out, true, charSet)
s.reportError(s.pos, "That doesn't sound right.", ps)
assertEquals("0030: THAT DOESN'T SOUND RIGHT.", out.toString(charSet))
}
}
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