Main implementation of the setHTML API

node/utils/ImportHtml.js

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+/**
+ * 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 jsdom = require('jsdom').jsdom;
+var log4js = require('log4js');
+
+var Changeset = require("./Changeset");
+var contentcollector = require("./contentcollector");
+var map = require("../../static/js/ace2_common.js").map;
+
+function setPadHTML(pad, html, callback)
+{
+  var apiLogger = log4js.getLogger("ImportHtml");
+
+  // Clean the pad. This makes the rest of the code easier
+  // by several orders of magnitude.
+  pad.setText("");
+  var padText = pad.text();
+
+  // Parse the incoming HTML with jsdom
+  var doc = jsdom(html);
+  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);
+  cc.collectContent(doc.childNodes[0]);
+  var result = cc.finish();
+  apiLogger.debug('Lines:');
+  var i;
+  for (i = 0; i < result.lines.length; i += 1)
+  {
+    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 = map(result.lines, function (e) {
+    return e + '\n';
+  }).join('');
+  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 - 1;
+    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.appendRevision(theChangeset);
+}
+
+exports.setPadHTML = setPadHTML;