src/Tools/jEdit/src/isabelle_rendering.scala
author wenzelm
Fri Sep 21 15:39:51 2012 +0200 (2012-09-21)
changeset 49492 2e3e7ea5ce8e
parent 49476 8ae5804c4ba8
child 49493 db58490a68ac
permissions -rw-r--r--
some support for hovering and sendback area;
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/*  Title:      Tools/jEdit/src/isabelle_rendering.scala
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    Author:     Makarius
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Isabelle specific physical rendering and markup selection.
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*/
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package isabelle.jedit
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import isabelle._
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import java.awt.Color
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import javax.swing.Icon
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import java.io.{File => JFile}
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import org.gjt.sp.jedit.syntax.{Token => JEditToken}
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import org.gjt.sp.jedit.GUIUtilities
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import org.gjt.sp.util.Log
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import scala.collection.immutable.SortedMap
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object Isabelle_Rendering
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{
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  def apply(snapshot: Document.Snapshot, options: Options): Isabelle_Rendering =
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    new Isabelle_Rendering(snapshot, options)
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  /* message priorities */
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  private val writeln_pri = 1
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  private val tracing_pri = 2
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  private val warning_pri = 3
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  private val legacy_pri = 4
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  private val error_pri = 5
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  private val message_pri = Map(
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    Isabelle_Markup.WRITELN -> writeln_pri, Isabelle_Markup.WRITELN_MESSAGE -> writeln_pri,
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    Isabelle_Markup.TRACING -> tracing_pri, Isabelle_Markup.TRACING_MESSAGE -> tracing_pri,
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    Isabelle_Markup.WARNING -> warning_pri, Isabelle_Markup.WARNING_MESSAGE -> warning_pri,
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    Isabelle_Markup.ERROR -> error_pri, Isabelle_Markup.ERROR_MESSAGE -> error_pri)
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  /* icons */
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  private def load_icon(name: String): Icon =
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  {
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    val icon = GUIUtilities.loadIcon(name)
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    if (icon.getIconWidth < 0 || icon.getIconHeight < 0)
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      Log.log(Log.ERROR, icon, "Bad icon: " + name)
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    icon
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  }
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  private val gutter_icons = Map(
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    warning_pri -> load_icon("16x16/status/dialog-information.png"),
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    legacy_pri -> load_icon("16x16/status/dialog-warning.png"),
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    error_pri -> load_icon("16x16/status/dialog-error.png"))
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  /* token markup -- text styles */
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  private val command_style: Map[String, Byte] =
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  {
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    import JEditToken._
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    Map[String, Byte](
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      Keyword.THY_END -> KEYWORD2,
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      Keyword.THY_SCRIPT -> LABEL,
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      Keyword.PRF_SCRIPT -> LABEL,
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      Keyword.PRF_ASM -> KEYWORD3,
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      Keyword.PRF_ASM_GOAL -> KEYWORD3
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    ).withDefaultValue(KEYWORD1)
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  }
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  private val token_style: Map[Token.Kind.Value, Byte] =
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  {
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    import JEditToken._
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    Map[Token.Kind.Value, Byte](
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      Token.Kind.KEYWORD -> KEYWORD2,
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      Token.Kind.IDENT -> NULL,
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      Token.Kind.LONG_IDENT -> NULL,
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      Token.Kind.SYM_IDENT -> NULL,
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      Token.Kind.VAR -> NULL,
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      Token.Kind.TYPE_IDENT -> NULL,
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      Token.Kind.TYPE_VAR -> NULL,
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      Token.Kind.NAT -> NULL,
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      Token.Kind.FLOAT -> NULL,
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      Token.Kind.STRING -> LITERAL1,
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      Token.Kind.ALT_STRING -> LITERAL2,
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      Token.Kind.VERBATIM -> COMMENT3,
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      Token.Kind.SPACE -> NULL,
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      Token.Kind.COMMENT -> COMMENT1,
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      Token.Kind.ERROR -> INVALID
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    ).withDefaultValue(NULL)
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  }
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  def token_markup(syntax: Outer_Syntax, token: Token): Byte =
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    if (token.is_command) command_style(syntax.keyword_kind(token.content).getOrElse(""))
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    else if (token.is_operator) JEditToken.OPERATOR
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    else token_style(token.kind)
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}
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class Isabelle_Rendering private(val snapshot: Document.Snapshot, val options: Options)
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{
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  /* colors */
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  def color_value(s: String): Color = Color_Value(options.string(s))
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  val outdated_color = color_value("outdated_color")
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  val unprocessed_color = color_value("unprocessed_color")
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  val unprocessed1_color = color_value("unprocessed1_color")
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  val running_color = color_value("running_color")
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  val running1_color = color_value("running1_color")
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  val light_color = color_value("light_color")
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  val writeln_color = color_value("writeln_color")
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  val warning_color = color_value("warning_color")
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  val error_color = color_value("error_color")
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  val error1_color = color_value("error1_color")
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  val writeln_message_color = color_value("writeln_message_color")
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  val tracing_message_color = color_value("tracing_message_color")
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  val warning_message_color = color_value("warning_message_color")
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  val error_message_color = color_value("error_message_color")
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  val bad_color = color_value("bad_color")
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  val intensify_color = color_value("intensify_color")
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  val quoted_color = color_value("quoted_color")
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  val highlight_color = color_value("highlight_color")
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  val hyperlink_color = color_value("hyperlink_color")
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  val sendback_color = color_value("sendback_color")
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  val sendback_active_color = color_value("sendback_active_color")
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  val keyword1_color = color_value("keyword1_color")
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  val keyword2_color = color_value("keyword2_color")
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  val tfree_color = color_value("tfree_color")
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  val tvar_color = color_value("tvar_color")
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  val free_color = color_value("free_color")
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  val skolem_color = color_value("skolem_color")
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  val bound_color = color_value("bound_color")
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  val var_color = color_value("var_color")
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  val inner_numeral_color = color_value("inner_numeral_color")
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  val inner_quoted_color = color_value("inner_quoted_color")
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  val inner_comment_color = color_value("inner_comment_color")
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  val antiquotation_color = color_value("antiquotation_color")
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  val dynamic_color = color_value("dynamic_color")
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  /* command overview */
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  def overview_color(range: Text.Range): Option[Color] =
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  {
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    if (snapshot.is_outdated) None
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    else {
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      val results =
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        snapshot.cumulate_markup[(Protocol.Status, Int)](
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          range, (Protocol.Status.init, 0),
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          Some(Protocol.command_status_markup + Isabelle_Markup.WARNING + Isabelle_Markup.ERROR),
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          {
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            case ((status, pri), Text.Info(_, XML.Elem(markup, _))) =>
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              if (markup.name == Isabelle_Markup.WARNING || markup.name == Isabelle_Markup.ERROR)
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                (status, pri max Isabelle_Rendering.message_pri(markup.name))
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              else (Protocol.command_status(status, markup), pri)
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          })
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      if (results.isEmpty) None
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      else {
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        val (status, pri) =
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          ((Protocol.Status.init, 0) /: results) {
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            case ((s1, p1), Text.Info(_, (s2, p2))) => (s1 + s2, p1 max p2) }
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        if (pri == Isabelle_Rendering.warning_pri) Some(warning_color)
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        else if (pri == Isabelle_Rendering.error_pri) Some(error_color)
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        else if (status.is_unprocessed) Some(unprocessed_color)
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        else if (status.is_running) Some(running_color)
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        else if (status.is_failed) Some(error_color)
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        else None
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      }
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    }
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  }
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  /* markup selectors */
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  private val highlight_include =
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    Set(Isabelle_Markup.SORT, Isabelle_Markup.TYP, Isabelle_Markup.TERM, Isabelle_Markup.PROP,
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      Isabelle_Markup.ML_TYPING, Isabelle_Markup.TOKEN_RANGE, Isabelle_Markup.ENTITY,
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      Isabelle_Markup.PATH, Isabelle_Markup.TYPING, Isabelle_Markup.FREE, Isabelle_Markup.SKOLEM,
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      Isabelle_Markup.BOUND, Isabelle_Markup.VAR, Isabelle_Markup.TFREE, Isabelle_Markup.TVAR,
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      Isabelle_Markup.ML_SOURCE, Isabelle_Markup.DOCUMENT_SOURCE)
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  def highlight(range: Text.Range): Option[Text.Info[Color]] =
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  {
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    snapshot.select_markup(range, Some(highlight_include),
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        {
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          case Text.Info(info_range, XML.Elem(Markup(name, _), _)) if highlight_include(name) =>
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            Text.Info(snapshot.convert(info_range), highlight_color)
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        }) match { case Text.Info(_, info) #:: _ => Some(info) case _ => None }
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  }
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  private val hyperlink_include = Set(Isabelle_Markup.ENTITY, Isabelle_Markup.PATH)
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  def hyperlink(range: Text.Range): Option[Text.Info[Hyperlink]] =
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  {
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    snapshot.cumulate_markup[List[Text.Info[Hyperlink]]](range, Nil, Some(hyperlink_include),
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        {
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          case (links, Text.Info(info_range, XML.Elem(Isabelle_Markup.Path(name), _)))
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          if Path.is_ok(name) =>
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            val jedit_file = Isabelle.thy_load.append(snapshot.node_name.dir, Path.explode(name))
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            Text.Info(snapshot.convert(info_range), Hyperlink(jedit_file, 0, 0)) :: links
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          case (links, Text.Info(info_range, XML.Elem(Markup(Isabelle_Markup.ENTITY, props), _)))
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          if (props.find(
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            { case (Markup.KIND, Isabelle_Markup.ML_OPEN) => true
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              case (Markup.KIND, Isabelle_Markup.ML_STRUCT) => true
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              case _ => false }).isEmpty) =>
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            props match {
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              case Position.Def_Line_File(line, name) if Path.is_ok(name) =>
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                Isabelle_System.source_file(Path.explode(name)) match {
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                  case Some(path) =>
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                    val jedit_file = Isabelle_System.platform_path(path)
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                    Text.Info(snapshot.convert(info_range), Hyperlink(jedit_file, line, 0)) :: links
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                  case None => links
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                }
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              case Position.Def_Id_Offset(id, offset) =>
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                snapshot.state.find_command(snapshot.version, id) match {
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                  case Some((node, command)) =>
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                    val sources =
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                      node.commands.iterator.takeWhile(_ != command).map(_.source) ++
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                        Iterator.single(command.source(Text.Range(0, command.decode(offset))))
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                    val (line, column) = ((1, 1) /: sources)(Symbol.advance_line_column)
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                    Text.Info(snapshot.convert(info_range),
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                      Hyperlink(command.node_name.node, line, column)) :: links
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                  case None => links
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                }
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              case _ => links
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            }
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        }) match { case Text.Info(_, info :: _) #:: _ => Some(info) case _ => None }
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  }
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  def sendback(range: Text.Range): Option[Text.Info[Sendback]] =
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  {
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    snapshot.select_markup(range, Some(Set(Isabelle_Markup.SENDBACK)),
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        {
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          case Text.Info(info_range, Protocol.Sendback(body)) =>
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            Text.Info(snapshot.convert(info_range), body)
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        }) match
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    {
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      case Text.Info(_, Text.Info(range, body)) #:: _ =>
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        snapshot.node.command_at(range.start)
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          .map(command_range => Text.Info(range, Sendback(command_range._1, body)))
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      case _ => None
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    }
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  }
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  private def tooltip_text(msg: XML.Tree): String =
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    Pretty.string_of(List(msg), margin = options.int("jedit_tooltip_margin"))
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  def tooltip_message(range: Text.Range): Option[String] =
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  {
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    val msgs =
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      snapshot.cumulate_markup[SortedMap[Long, String]](range, SortedMap.empty,
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        Some(Set(Isabelle_Markup.WRITELN, Isabelle_Markup.WARNING, Isabelle_Markup.ERROR,
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          Isabelle_Markup.BAD)),
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        {
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          case (msgs, Text.Info(_, msg @
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              XML.Elem(Markup(markup, Isabelle_Markup.Serial(serial)), _)))
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          if markup == Isabelle_Markup.WRITELN ||
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              markup == Isabelle_Markup.WARNING ||
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              markup == Isabelle_Markup.ERROR =>
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            msgs + (serial -> tooltip_text(msg))
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          case (msgs, Text.Info(_, msg @ XML.Elem(Markup(Isabelle_Markup.BAD, _), body)))
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          if !body.isEmpty => msgs + (Document.new_id() -> tooltip_text(msg))
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        }).toList.flatMap(_.info)
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    if (msgs.isEmpty) None else Some(cat_lines(msgs.iterator.map(_._2)))
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  }
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  private val tooltips: Map[String, String] =
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    Map(
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      Isabelle_Markup.SORT -> "sort",
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      Isabelle_Markup.TYP -> "type",
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      Isabelle_Markup.TERM -> "term",
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      Isabelle_Markup.PROP -> "proposition",
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      Isabelle_Markup.TOKEN_RANGE -> "inner syntax token",
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      Isabelle_Markup.FREE -> "free variable",
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      Isabelle_Markup.SKOLEM -> "skolem variable",
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      Isabelle_Markup.BOUND -> "bound variable",
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      Isabelle_Markup.VAR -> "schematic variable",
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      Isabelle_Markup.TFREE -> "free type variable",
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      Isabelle_Markup.TVAR -> "schematic type variable",
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      Isabelle_Markup.ML_SOURCE -> "ML source",
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      Isabelle_Markup.DOCUMENT_SOURCE -> "document source")
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  private val tooltip_elements =
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    Set(Isabelle_Markup.ENTITY, Isabelle_Markup.TYPING, Isabelle_Markup.ML_TYPING,
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      Isabelle_Markup.PATH) ++ tooltips.keys
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  private def string_of_typing(kind: String, body: XML.Body): String =
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    Pretty.string_of(List(Pretty.block(XML.Text(kind) :: Pretty.Break(1) :: body)),
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      margin = options.int("jedit_tooltip_margin"))
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  def tooltip(range: Text.Range): Option[String] =
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  {
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    def add(prev: Text.Info[List[(Boolean, String)]], r: Text.Range, p: (Boolean, String)) =
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      if (prev.range == r) Text.Info(r, p :: prev.info) else Text.Info(r, List(p))
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    val tips =
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      snapshot.cumulate_markup[Text.Info[(List[(Boolean, String)])]](
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        range, Text.Info(range, Nil), Some(tooltip_elements),
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        {
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          case (prev, Text.Info(r, XML.Elem(Isabelle_Markup.Entity(kind, name), _))) =>
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            val kind1 = space_explode('_', kind).mkString(" ")
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            add(prev, r, (true, kind1 + " " + quote(name)))
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          case (prev, Text.Info(r, XML.Elem(Isabelle_Markup.Path(name), _)))
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          if Path.is_ok(name) =>
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            val jedit_file = Isabelle.thy_load.append(snapshot.node_name.dir, Path.explode(name))
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            add(prev, r, (true, "file " + quote(jedit_file)))
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   321
          case (prev, Text.Info(r, XML.Elem(Markup(Isabelle_Markup.TYPING, _), body))) =>
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            add(prev, r, (true, string_of_typing("::", body)))
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   323
          case (prev, Text.Info(r, XML.Elem(Markup(Isabelle_Markup.ML_TYPING, _), body))) =>
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            add(prev, r, (false, string_of_typing("ML:", body)))
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          case (prev, Text.Info(r, XML.Elem(Markup(name, _), _)))
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          if tooltips.isDefinedAt(name) => add(prev, r, (true, tooltips(name)))
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   327
        }).toList.flatMap(_.info.info)
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    val all_tips =
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      (tips.filter(_._1) ++ tips.filter(!_._1).lastOption.toList).map(_._2)
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    if (all_tips.isEmpty) None else Some(cat_lines(all_tips))
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  }
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   333
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  def gutter_message(range: Text.Range): Option[Icon] =
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  {
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    val results =
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      snapshot.cumulate_markup[Int](range, 0,
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   339
        Some(Set(Isabelle_Markup.WARNING, Isabelle_Markup.ERROR)),
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   340
        {
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          case (pri, Text.Info(_, XML.Elem(Markup(Isabelle_Markup.WARNING, _), body))) =>
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            body match {
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              case List(XML.Elem(Markup(Isabelle_Markup.LEGACY, _), _)) =>
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                pri max Isabelle_Rendering.legacy_pri
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              case _ => pri max Isabelle_Rendering.warning_pri
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   346
            }
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          case (pri, Text.Info(_, XML.Elem(Markup(Isabelle_Markup.ERROR, _), _))) =>
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            pri max Isabelle_Rendering.error_pri
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   349
        })
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    val pri = (0 /: results) { case (p1, Text.Info(_, p2)) => p1 max p2 }
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    Isabelle_Rendering.gutter_icons.get(pri)
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  }
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   354
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   355
  private val squiggly_colors = Map(
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    Isabelle_Rendering.writeln_pri -> writeln_color,
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    Isabelle_Rendering.warning_pri -> warning_color,
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    Isabelle_Rendering.error_pri -> error_color)
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   360
  def squiggly_underline(range: Text.Range): Stream[Text.Info[Color]] =
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   361
  {
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    val results =
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      snapshot.cumulate_markup[Int](range, 0,
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   364
        Some(Set(Isabelle_Markup.WRITELN, Isabelle_Markup.WARNING, Isabelle_Markup.ERROR)),
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   365
        {
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          case (pri, Text.Info(_, XML.Elem(Markup(name, _), _)))
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          if name == Isabelle_Markup.WRITELN ||
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            name == Isabelle_Markup.WARNING ||
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   369
            name == Isabelle_Markup.ERROR => pri max Isabelle_Rendering.message_pri(name)
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   370
        })
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    for {
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      Text.Info(r, pri) <- results
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   373
      color <- squiggly_colors.get(pri)
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   374
    } yield Text.Info(r, color)
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   375
  }
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   377
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   378
  private val message_colors = Map(
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    Isabelle_Rendering.writeln_pri -> writeln_message_color,
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   380
    Isabelle_Rendering.tracing_pri -> tracing_message_color,
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   381
    Isabelle_Rendering.warning_pri -> warning_message_color,
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   382
    Isabelle_Rendering.error_pri -> error_message_color)
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   383
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   384
  def line_background(range: Text.Range): Option[(Color, Boolean)] =
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  {
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    val messages =
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      Set(Isabelle_Markup.WRITELN_MESSAGE, Isabelle_Markup.TRACING_MESSAGE,
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   388
        Isabelle_Markup.WARNING_MESSAGE, Isabelle_Markup.ERROR_MESSAGE)
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   389
    val results =
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   390
      snapshot.cumulate_markup[Int](range, 0, Some(messages),
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   391
        {
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   392
          case (pri, Text.Info(_, XML.Elem(Markup(name, _), _)))
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   393
          if name == Isabelle_Markup.WRITELN_MESSAGE ||
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   394
            name == Isabelle_Markup.TRACING_MESSAGE ||
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   395
            name == Isabelle_Markup.WARNING_MESSAGE ||
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   396
            name == Isabelle_Markup.ERROR_MESSAGE => pri max Isabelle_Rendering.message_pri(name)
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   397
        })
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   398
    val pri = (0 /: results) { case (p1, Text.Info(_, p2)) => p1 max p2 }
wenzelm@49474
   399
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   400
    val is_separator = pri > 0 &&
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   401
      snapshot.cumulate_markup[Boolean](range, false, Some(Set(Isabelle_Markup.SEPARATOR)),
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   402
        {
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   403
          case (_, Text.Info(_, XML.Elem(Markup(Isabelle_Markup.SEPARATOR, _), _))) => true
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   404
        }).exists(_.info)
wenzelm@49473
   405
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   406
    message_colors.get(pri).map((_, is_separator))
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   407
  }
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   408
wenzelm@49492
   409
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   410
  private val background1_include =
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   411
    Protocol.command_status_markup + Isabelle_Markup.WRITELN_MESSAGE +
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   412
      Isabelle_Markup.TRACING_MESSAGE + Isabelle_Markup.WARNING_MESSAGE +
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   413
      Isabelle_Markup.ERROR_MESSAGE + Isabelle_Markup.BAD + Isabelle_Markup.INTENSIFY +
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   414
      Isabelle_Markup.SENDBACK
wenzelm@49492
   415
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   416
  def background1(range: Text.Range): Stream[Text.Info[Color]] =
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   417
  {
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   418
    if (snapshot.is_outdated) Stream(Text.Info(range, outdated_color))
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   419
    else
wenzelm@49356
   420
      for {
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   421
        Text.Info(r, result) <-
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   422
          snapshot.cumulate_markup[(Option[Protocol.Status], Option[Color])](
wenzelm@49492
   423
            range, (Some(Protocol.Status.init), None), Some(background1_include),
wenzelm@49356
   424
            {
wenzelm@49356
   425
              case (((Some(status), color), Text.Info(_, XML.Elem(markup, _))))
wenzelm@49356
   426
              if (Protocol.command_status_markup(markup.name)) =>
wenzelm@49356
   427
                (Some(Protocol.command_status(status, markup)), color)
wenzelm@49356
   428
              case (_, Text.Info(_, XML.Elem(Markup(Isabelle_Markup.BAD, _), _))) =>
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   429
                (None, Some(bad_color))
wenzelm@49358
   430
              case (_, Text.Info(_, XML.Elem(Markup(Isabelle_Markup.INTENSIFY, _), _))) =>
wenzelm@49358
   431
                (None, Some(intensify_color))
wenzelm@49492
   432
              case (_, Text.Info(_, XML.Elem(Markup(Isabelle_Markup.SENDBACK, _), _))) =>
wenzelm@49492
   433
                (None, Some(sendback_color))
wenzelm@49356
   434
            })
wenzelm@49356
   435
        color <-
wenzelm@49356
   436
          (result match {
wenzelm@49356
   437
            case (Some(status), opt_color) =>
wenzelm@49356
   438
              if (status.is_unprocessed) Some(unprocessed1_color)
wenzelm@49356
   439
              else if (status.is_running) Some(running1_color)
wenzelm@49356
   440
              else opt_color
wenzelm@49356
   441
            case (_, opt_color) => opt_color
wenzelm@49356
   442
          })
wenzelm@49356
   443
      } yield Text.Info(r, color)
wenzelm@49356
   444
  }
wenzelm@49356
   445
wenzelm@49356
   446
wenzelm@49356
   447
  def background2(range: Text.Range): Stream[Text.Info[Color]] =
wenzelm@49356
   448
    snapshot.select_markup(range,
wenzelm@49356
   449
      Some(Set(Isabelle_Markup.TOKEN_RANGE)),
wenzelm@49356
   450
      {
wenzelm@49356
   451
        case Text.Info(_, XML.Elem(Markup(Isabelle_Markup.TOKEN_RANGE, _), _)) => light_color
wenzelm@49356
   452
      })
wenzelm@49356
   453
wenzelm@49356
   454
wenzelm@49356
   455
  def foreground(range: Text.Range): Stream[Text.Info[Color]] =
wenzelm@49356
   456
    snapshot.select_markup(range,
wenzelm@49356
   457
      Some(Set(Isabelle_Markup.STRING, Isabelle_Markup.ALTSTRING, Isabelle_Markup.VERBATIM)),
wenzelm@49356
   458
      {
wenzelm@49356
   459
        case Text.Info(_, XML.Elem(Markup(Isabelle_Markup.STRING, _), _)) => quoted_color
wenzelm@49356
   460
        case Text.Info(_, XML.Elem(Markup(Isabelle_Markup.ALTSTRING, _), _)) => quoted_color
wenzelm@49356
   461
        case Text.Info(_, XML.Elem(Markup(Isabelle_Markup.VERBATIM, _), _)) => quoted_color
wenzelm@49356
   462
      })
wenzelm@49356
   463
wenzelm@49356
   464
wenzelm@49356
   465
  private val text_colors: Map[String, Color] = Map(
wenzelm@49356
   466
      Isabelle_Markup.STRING -> Color.BLACK,
wenzelm@49356
   467
      Isabelle_Markup.ALTSTRING -> Color.BLACK,
wenzelm@49356
   468
      Isabelle_Markup.VERBATIM -> Color.BLACK,
wenzelm@49356
   469
      Isabelle_Markup.LITERAL -> keyword1_color,
wenzelm@49356
   470
      Isabelle_Markup.DELIMITER -> Color.BLACK,
wenzelm@49356
   471
      Isabelle_Markup.TFREE -> tfree_color,
wenzelm@49356
   472
      Isabelle_Markup.TVAR -> tvar_color,
wenzelm@49356
   473
      Isabelle_Markup.FREE -> free_color,
wenzelm@49356
   474
      Isabelle_Markup.SKOLEM -> skolem_color,
wenzelm@49356
   475
      Isabelle_Markup.BOUND -> bound_color,
wenzelm@49356
   476
      Isabelle_Markup.VAR -> var_color,
wenzelm@49356
   477
      Isabelle_Markup.INNER_STRING -> inner_quoted_color,
wenzelm@49356
   478
      Isabelle_Markup.INNER_COMMENT -> inner_comment_color,
wenzelm@49356
   479
      Isabelle_Markup.DYNAMIC_FACT -> dynamic_color,
wenzelm@49356
   480
      Isabelle_Markup.ML_KEYWORD -> keyword1_color,
wenzelm@49356
   481
      Isabelle_Markup.ML_DELIMITER -> Color.BLACK,
wenzelm@49356
   482
      Isabelle_Markup.ML_NUMERAL -> inner_numeral_color,
wenzelm@49356
   483
      Isabelle_Markup.ML_CHAR -> inner_quoted_color,
wenzelm@49356
   484
      Isabelle_Markup.ML_STRING -> inner_quoted_color,
wenzelm@49356
   485
      Isabelle_Markup.ML_COMMENT -> inner_comment_color,
wenzelm@49356
   486
      Isabelle_Markup.ANTIQ -> antiquotation_color)
wenzelm@49356
   487
wenzelm@49356
   488
  private val text_color_elements = Set.empty[String] ++ text_colors.keys
wenzelm@49356
   489
wenzelm@49356
   490
  def text_color(range: Text.Range, color: Color)
wenzelm@49356
   491
      : Stream[Text.Info[Color]] =
wenzelm@49356
   492
  {
wenzelm@49356
   493
    snapshot.cumulate_markup(range, color, Some(text_color_elements),
wenzelm@49356
   494
      {
wenzelm@49356
   495
        case (_, Text.Info(_, XML.Elem(Markup(m, _), _)))
wenzelm@49356
   496
        if text_colors.isDefinedAt(m) => text_colors(m)
wenzelm@49356
   497
      })
wenzelm@49356
   498
  }
wenzelm@49356
   499
}