/*  Title:      Tools/jEdit/src/token_markup.scala

    Author:     Makarius

Outer syntax token markup.

*/

package isabelle.jedit

import isabelle._

import org.gjt.sp.jedit.Buffer

import org.gjt.sp.jedit.syntax.{Token => JToken, TokenMarker, TokenHandler, ParserRuleSet}

import javax.swing.text.Segment

object Token_Markup

{

  /* extended jEdit syntax styles */

  private val plain_range: Int = JToken.ID_COUNT

  private def check_range(i: Int) { require(0 <= i && i < plain_range) }

  def subscript(i: Byte): Byte = { check_range(i); (i + plain_range).toByte }

  def superscript(i: Byte): Byte = { check_range(i); (i + 2 * plain_range).toByte }

  val hidden: Byte = (3 * plain_range).toByte

  /* token marker */

  private val isabelle_rules = new ParserRuleSet("isabelle", "MAIN")

  private class Line_Context(val context: Scan.Context)

    extends TokenMarker.LineContext(isabelle_rules, null)

  {

    override def hashCode: Int = context.hashCode

    override def equals(that: Any): Boolean =

      that match {

        case other: Line_Context => context == other.context

        case _ => false

      }

  }

  def token_marker(session: Session, buffer: Buffer): TokenMarker =

    new TokenMarker {

      override def markTokens(context: TokenMarker.LineContext,

          handler: TokenHandler, line: Segment): TokenMarker.LineContext =

      {

        Isabelle.swing_buffer_lock(buffer) {

          val syntax = session.current_syntax()

          val ctxt =

            context match {

              case c: Line_Context => c.context

              case _ => Scan.Finished

            }

          val (tokens, ctxt1) = syntax.scan_context(line, ctxt)

          val context1 = new Line_Context(ctxt1)

          var offset = 0

          for (token <- tokens) {

            val style = Isabelle_Markup.token_markup(syntax, token)

            val length = token.source.length

            handler.handleToken(line, style, offset, length, context1)

            offset += length

          }

          handler.handleToken(line, JToken.END, line.count, 0, context1)

          handler.setLineContext(context1)

          context1

        }

      }

    }

}