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      // parts is an interface to make it possible to 'delay' fetching
      // the next DOM node until we are completely done with the one
      // before it. This is necessary because often the next node is
      // not yet available when we want to proceed past the current
      // one.
      var parts = {
        current: null,
        // Fetch current node.
        get: function(){
          if (!this.current)
            this.current = traversal.nodes.shift();
          return this.current;
        },
        // Advance to the next part (do not fetch it yet).
        next: function(){
          this.current = null;
        },
        // Remove the current part from the DOM tree, and move to the
        // next.
        remove: function(){
          container.removeChild(this.get());
          this.current = null;
        },
        // Advance to the next part that is not empty, discarding empty
        // parts.
        getNonEmpty: function(){
          var part = this.get();
          // Allow empty nodes when they are alone on a line, needed
          // for the FF cursor bug workaround (see select.js,
          // insertNewlineAtCursor).
          while (part && isSpan(part) && part.currentText == "") {
            // Leave empty nodes that are alone on a line alone in
            // Opera, since that browsers doesn't deal well with
            // having 2 BRs in a row.
            if (window.opera && surroundedByBRs(part)) {
              this.next();
              part = this.get();
            }
            else {
              var old = part;
              this.remove();
              part = this.get();
              // Adjust selection information, if any. See select.js for details.
              select.snapshotMove(old.firstChild, part && (part.firstChild || part), 0);
            }
          }
          
          return part;
        }
      };

      var lineDirty = false, prevLineDirty = true, lineNodes = 0;

      // This forEach loops over the tokens from the parsed stream, and
      // at the same time uses the parts object to proceed through the
      // corresponding DOM nodes.
      forEach(parsed, function(token){
        var part = parts.getNonEmpty();

        if (token.value == "\n"){
          // The idea of the two streams actually staying synchronized
          // is such a long shot that we explicitly check.
          if (!isBR(part))
            throw "Parser out of sync. Expected BR.";

          if (part.dirty || !part.indentation) lineDirty = true;
          maybeTouch(from);
          from = part;

          // Every <br> gets a copy of the parser state and a lexical
          // context assigned to it. The first is used to be able to
          // later resume parsing from this point, the second is used
          // for indentation.
          part.parserFromHere = parsed.copy();
          part.indentation = token.indentation || alwaysZero;
          part.dirty = false;

          // If the target argument wasn't an integer, go at least
          // until that node.
          if (endTime == null && part == target) throw StopIteration;

          // A clean line with more than one node means we are done.
          // Throwing a StopIteration is the way to break out of a
          // MochiKit forEach loop.
          if ((endTime != null && time() >= endTime) || (!lineDirty && !prevLineDirty && lineNodes > 1 && !cleanLines))
            throw StopIteration;
          prevLineDirty = lineDirty; lineDirty = false; lineNodes = 0;
          parts.next();
        }
        else {
          if (!isSpan(part))
            throw "Parser out of sync. Expected SPAN.";
          if (part.dirty)
            lineDirty = true;
          lineNodes++;

          // If the part matches the token, we can leave it alone.
          if (correctPart(token, part)){
            part.dirty = false;
            parts.next();
          }
          // Otherwise, we have to fix it.
          else {
            lineDirty = true;
            // Insert the correct part.
            var newPart = tokenPart(token);
            container.insertBefore(newPart, part);
            if (active) active(newPart, token, self);
            var tokensize = token.value.length;
            var offset = 0;
            // Eat up parts until the text for this token has been
            // removed, adjusting the stored selection info (see
            // select.js) in the process.
            while (tokensize > 0) {
              part = parts.get();
              var partsize = part.currentText.length;
              select.snapshotReplaceNode(part.firstChild, newPart.firstChild, tokensize, offset);
              if (partsize > tokensize){
                shortenPart(part, tokensize);
                tokensize = 0;
              }