text: /**
   * Copyright Yaco Sistemas S.L. 2011.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS-IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  var log4js = require('log4js');
  var Changeset = require("ep_etherpad-lite/static/js/Changeset");
  var contentcollector = require("ep_etherpad-lite/static/js/contentcollector");
  var cheerio = require("cheerio");
  
  exports.setPadHTML = function(pad, html)
  {
    var apiLogger = log4js.getLogger("ImportHtml");
  
    var $ = cheerio.load(html);
  
    // Appends a line break, used by Etherpad to ensure a caret is available
    // below the last line of an import
    $('body').append("<p></p>");
  
    var doc = $('html')[0];
    apiLogger.debug('html:');
    apiLogger.debug(html);
  
    // Convert a dom tree into a list of lines and attribute liens
    // using the content collector object
    var cc = contentcollector.makeContentCollector(true, null, pad.pool);
    try {
      // we use a try here because if the HTML is bad it will blow up
      cc.collectContent(doc);
    } catch(e) {
      apiLogger.warn("HTML was not properly formed", e);
  
      // don't process the HTML because it was bad
      throw e;
    }
  
    var result = cc.finish();
  
    apiLogger.debug('Lines:');
  
    var i;
    for (i = 0; i < result.lines.length; i++) {
      apiLogger.debug('Line ' + (i + 1) + ' text: ' + result.lines[i]);
      apiLogger.debug('Line ' + (i + 1) + ' attributes: ' + result.lineAttribs[i]);
    }
  
    // Get the new plain text and its attributes
    var newText = result.lines.join('\n');
    apiLogger.debug('newText:');
    apiLogger.debug(newText);
    var newAttribs = result.lineAttribs.join('|1+1') + '|1+1';
  
    function eachAttribRun(attribs, func /*(startInNewText, endInNewText, attribs)*/ ) {
      var attribsIter = Changeset.opIterator(attribs);
      var textIndex = 0;
      var newTextStart = 0;
      var newTextEnd = newText.length;
      while (attribsIter.hasNext()) {
        var op = attribsIter.next();
        var nextIndex = textIndex + op.chars;
        if (!(nextIndex <= newTextStart || textIndex >= newTextEnd)) {
          func(Math.max(newTextStart, textIndex), Math.min(newTextEnd, nextIndex), op.attribs);
        }
        textIndex = nextIndex;
      }
    }
  
    // create a new changeset with a helper builder object
    var builder = Changeset.builder(1);
  
    // assemble each line into the builder
    eachAttribRun(newAttribs, function(start, end, attribs) {
      builder.insert(newText.substring(start, end), attribs);
    });
  
    // the changeset is ready!
    var theChangeset = builder.toString();
  
    apiLogger.debug('The changeset: ' + theChangeset);
    pad.setText("\n");
    pad.appendRevision(theChangeset);
  }
  