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/*  Title:      Pure/Thy/html.scala
    Module:     PIDE
    Author:     Makarius

HTML presentation elements.
*/

package isabelle


object HTML
{
  /* encode text */

  def encode(text: String): String =
  {
    val s = new StringBuilder
    for (c <- text.iterator) c match {
      case '<' => s ++= "<"
      case '>' => s ++= ">"
      case '&' => s ++= "&"
      case '"' => s ++= """
      case '\'' => s ++= "'"
      case '\n' => s ++= "
"
      case _ => s += c
    }
    s.toString
  }


  /* document */

  val end_document = "\n

\n\n\n"

  def begin_document(title: String): String =
    "\n" +
    "\n" +
    "\n" +
    "\n" +
    "\n" +
    "" + encode(title) + "\n" +
    "\n" +
    "\n" +
    "\n" +
    "\n" +
    "

" +
    "" + encode(title) + "\n"


  /* common markup elements */

  private def session_entry(entry: (String, String)): String =
  {
    val (name, description) = entry
    val descr =
      if (description == "") Nil
      else List(XML.elem("br"), XML.elem("pre", List(XML.Text(description))))
    XML.string_of_tree(
      XML.elem("li",
        List(XML.Elem(Markup("a", List(("href", name + "/index.html"))),
          List(XML.Text(name)))) ::: descr)) + "\n"
  }

  def chapter_index(chapter: String, sessions: List[(String, String)]): String =
  {
    begin_document("Isabelle/" + chapter + " sessions") +
      (if (sessions.isEmpty) ""
       else "

\n" + sessions.map(session_entry(_)).mkString + "") +
    end_document
  }
}