/*
* Isabelle encoding -- based on utf-8
*
* @author Makarius
*/
package isabelle.jedit
import org.gjt.sp.jedit.io.Encoding
import org.gjt.sp.jedit.buffer.JEditBuffer
import java.nio.charset.{Charset, CharsetDecoder, CodingErrorAction}
import java.io.{InputStream, OutputStream, Reader, Writer, InputStreamReader, OutputStreamWriter,
CharArrayReader, ByteArrayOutputStream}
import scala.io.{Source, BufferedSource}
object Isabelle_Encoding
{
val NAME = "UTF-8-Isabelle"
def is_active(buffer: JEditBuffer): Boolean =
buffer.getProperty(JEditBuffer.ENCODING).asInstanceOf[String] == NAME
}
class Isabelle_Encoding extends Encoding
{
private val charset = Charset.forName(Isabelle_System.charset)
private val BUFSIZE = 32768
private def text_reader(in: InputStream, decoder: CharsetDecoder): Reader =
{
def source(): Source =
BufferedSource.fromInputStream(in, decoder, BUFSIZE, { () => source() })
new CharArrayReader(Isabelle.symbols.decode(source.mkString).toArray)
}
override def getTextReader(in: InputStream): Reader =
text_reader(in, charset.newDecoder())
override def getPermissiveTextReader(in: InputStream): Reader =
{
val decoder = charset.newDecoder()
decoder.onMalformedInput(CodingErrorAction.REPLACE)
decoder.onUnmappableCharacter(CodingErrorAction.REPLACE)
text_reader(in, decoder)
}
override def getTextWriter(out: OutputStream): Writer =
{
val buffer = new ByteArrayOutputStream(BUFSIZE) {
override def flush()
{
val text = Isabelle.symbols.encode(toString(Isabelle_System.charset))
out.write(text.getBytes(Isabelle_System.charset))
out.flush()
}
override def close() { out.close() }
}
new OutputStreamWriter(buffer, charset.newEncoder())
}
}