src/Pure/General/yxml.scala

--- a/src/Pure/General/yxml.scala	Sun Sep 04 14:29:15 2011 +0200
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,134 +0,0 @@
-/*  Title:      Pure/General/yxml.scala
-    Author:     Makarius
-
-Efficient text representation of XML trees.
-*/
-
-package isabelle
-
-
-import scala.collection.mutable
-
-
-object YXML
-{
-  /* chunk markers */
-
-  val X = '\5'
-  val Y = '\6'
-  val X_string = X.toString
-  val Y_string = Y.toString
-
-  def detect(s: String): Boolean = s.exists(c => c == X || c == Y)
-
-
-  /* string representation */  // FIXME byte array version with pseudo-utf-8 (!?)
-
-  def string_of_body(body: XML.Body): String =
-  {
-    val s = new StringBuilder
-    def attrib(p: (String, String)) { s += Y; s ++= p._1; s += '='; s ++= p._2 }
-    def tree(t: XML.Tree): Unit =
-      t match {
-        case XML.Elem(Markup(name, atts), ts) =>
-          s += X; s += Y; s++= name; atts.foreach(attrib); s += X
-          ts.foreach(tree)
-          s += X; s += Y; s += X
-        case XML.Text(text) => s ++= text
-      }
-    body.foreach(tree)
-    s.toString
-  }
-
-  def string_of_tree(tree: XML.Tree): String = string_of_body(List(tree))
-
-
-  /* parsing */
-
-  private def err(msg: String) = error("Malformed YXML: " + msg)
-  private def err_attribute() = err("bad attribute")
-  private def err_element() = err("bad element")
-  private def err_unbalanced(name: String) =
-    if (name == "") err("unbalanced element")
-    else err("unbalanced element " + quote(name))
-
-  private def parse_attrib(source: CharSequence) = {
-    val s = source.toString
-    val i = s.indexOf('=')
-    if (i <= 0) err_attribute()
-    (s.substring(0, i), s.substring(i + 1))
-  }
-
-
-  def parse_body(source: CharSequence): XML.Body =
-  {
-    /* stack operations */
-
-    def buffer(): mutable.ListBuffer[XML.Tree] = new mutable.ListBuffer[XML.Tree]
-    var stack: List[(Markup, mutable.ListBuffer[XML.Tree])] = List((Markup.Empty, buffer()))
-
-    def add(x: XML.Tree)
-    {
-      (stack: @unchecked) match { case ((_, body) :: _) => body += x }
-    }
-
-    def push(name: String, atts: XML.Attributes)
-    {
-      if (name == "") err_element()
-      else stack = (Markup(name, atts), buffer()) :: stack
-    }
-
-    def pop()
-    {
-      (stack: @unchecked) match {
-        case ((Markup.Empty, _) :: _) => err_unbalanced("")
-        case ((markup, body) :: pending) =>
-          stack = pending
-          add(XML.Elem(markup, body.toList))
-      }
-    }
-
-
-    /* parse chunks */
-
-    for (chunk <- Library.chunks(source, X) if chunk.length != 0) {
-      if (chunk.length == 1 && chunk.charAt(0) == Y) pop()
-      else {
-        Library.chunks(chunk, Y).toList match {
-          case ch :: name :: atts if ch.length == 0 =>
-            push(name.toString, atts.map(parse_attrib))
-          case txts => for (txt <- txts) add(XML.Text(txt.toString))
-        }
-      }
-    }
-    (stack: @unchecked) match {
-      case List((Markup.Empty, body)) => body.toList
-      case (Markup(name, _), _) :: _ => err_unbalanced(name)
-    }
-  }
-
-  def parse(source: CharSequence): XML.Tree =
-    parse_body(source) match {
-      case List(result) => result
-      case Nil => XML.Text("")
-      case _ => err("multiple results")
-    }
-
-
-  /* failsafe parsing */
-
-  private def markup_malformed(source: CharSequence) =
-    XML.elem(Markup.MALFORMED, List(XML.Text(source.toString)))
-
-  def parse_body_failsafe(source: CharSequence): XML.Body =
-  {
-    try { parse_body(source) }
-    catch { case ERROR(_) => List(markup_malformed(source)) }
-  }
-
-  def parse_failsafe(source: CharSequence): XML.Tree =
-  {
-    try { parse(source) }
-    catch { case ERROR(_) => markup_malformed(source) }
-  }
-}