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added img to the list of elements allowed in simple UI text

/*
  This file is part of LONCAPA-Daxe.

  LONCAPA-Daxe is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  LONCAPA-Daxe is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with Daxe.  If not, see <http://www.gnu.org/licenses/>.
*/

part of loncapa_daxe;

class SimpleUIText {
  
  static List<String> possibleDescendants = ['m','lm','chem','num','table','tr','td','ul','ol','li',
    'a','span','p','b','i','sup','sub','section','img'];

  /**
   * Returns true if the given node only contains elements that can be displayed
   * with simple UI as part of the text.
   * Can throw a SimpleUIException.
   */
  static bool checkNodeContents(DaxeNode node) {
    for (DaxeNode dn=node.firstChild; dn!= null; dn=dn.nextSibling) {
      if (!SimpleUIText.checkNode(dn)) {
        if (dn.nodeName != null)
          throw new SimpleUIException(LCDStrings.get('element_prevents') + ' ' + dn.nodeName);
        return false;
      }
    }
    return true;
  }
  
  /**
   * Returns true if the given node can be displayed with simple UI as part of the text.
   */
  static bool checkNode(DaxeNode node) {
    if (node.nodeType == DaxeNode.TEXT_NODE)
      return true;
    if (!possibleDescendants.contains(node.nodeName)) {
      String title = doc.cfg.elementTitle(node.ref);
      throw new SimpleUIException(LCDStrings.get('element_prevents') + ' ' + node.nodeName +
          (title != null ? " ($title)" : ''));
    } if (node.attributes.length != 0) {
      // In what case could attributes be a problem for HTML elements ?
      return true;
    }
    return SimpleUIText.checkNodeContents(node);
  }
}