src/Pure/Thy/html.scala
author wenzelm
Sat, 26 Apr 2014 13:32:28 +0200
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tuned imports;
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/*  Title:      Pure/Thy/html.scala
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    Module:     PIDE-GUI
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    Author:     Makarius
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HTML presentation elements.
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*/
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package isabelle
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object HTML
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{
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  /* encode text */
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  def encode(text: String): String =
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  {
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    val s = new StringBuilder
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    for (c <- text.iterator) c match {
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      case '<' => s ++= "&lt;"
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      case '>' => s ++= "&gt;"
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      case '&' => s ++= "&amp;"
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      case '"' => s ++= "&quot;"
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      case '\'' => s ++= "&#39;"
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      case '\n' => s ++= "<br/>"
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      case _ => s += c
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    }
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    s.toString
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  }
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  /* document */
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  val end_document = "\n</div>\n</body>\n</html>\n"
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  def begin_document(title: String): String =
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    "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n" +
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    "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" " +
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    "\"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">\n" +
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    "<html xmlns=\"http://www.w3.org/1999/xhtml\">\n" +
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    "<head>\n" +
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    "<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\"/>\n" +
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    "<title>" + encode(title) + "</title>\n" +
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    "<link media=\"all\" rel=\"stylesheet\" type=\"text/css\" href=\"isabelle.css\"/>\n" +
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    "</head>\n" +
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    "\n" +
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    "<body>\n" +
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    "<div class=\"head\">" +
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    "<h1>" + encode(title) + "</h1>\n"
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  /* common markup elements */
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  private def session_entry(entry: (String, String)): String =
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  {
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    val (name, description) = entry
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    val descr =
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      if (description == "") Nil
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      else List(XML.elem("br"), XML.elem("pre", List(XML.Text(description))))
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    XML.string_of_tree(
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      XML.elem("li",
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        List(XML.Elem(Markup("a", List(("href", name + "/index.html"))),
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          List(XML.Text(name)))) ::: descr)) + "\n"
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  }
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  def chapter_index(chapter: String, sessions: List[(String, String)]): String =
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  {
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    begin_document("Isabelle/" + chapter + " sessions") +
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      (if (sessions.isEmpty) ""
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       else "<div class=\"sessions\"><ul>\n" + sessions.map(session_entry(_)).mkString + "</ul>") +
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    end_document
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  }
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}