1 files changed, 106 insertions, 0 deletions
diff --git a/src/static/js/ace2_common.js b/src/static/js/ace2_common.js
new file mode 100644
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+++ b/src/static/js/ace2_common.js
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+/**
+ * This code is mostly from the old Etherpad. Please help us to comment this code. 
+ * This helps other people to understand this code better and helps them to improve it.
+ * TL;DR COMMENTS ON THIS FILE ARE HIGHLY APPRECIATED
+ */
+
+/**
+ * Copyright 2009 Google Inc.
+ *
+ * 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 Security = require('./security');
+
+function isNodeText(node)
+{
+  return (node.nodeType == 3);
+}
+
+function object(o)
+{
+  var f = function(){};
+  f.prototype = o;
+  return new f();
+}
+var userAgent = (((function () {return this;})().navigator || {}).userAgent || 'node-js').toLowerCase();
+
+// Figure out what browser is being used (stolen from jquery 1.2.1)
+var browser = {
+  version: (userAgent.match(/.+(?:rv|it|ra|ie)[\/: ]([\d.]+)/) || [])[1],
+  safari: /webkit/.test(userAgent),
+  opera: /opera/.test(userAgent),
+  msie: /msie/.test(userAgent) && !/opera/.test(userAgent),
+  mozilla: /mozilla/.test(userAgent) && !/(compatible|webkit)/.test(userAgent),
+  windows: /windows/.test(userAgent),
+  mobile: /mobile/.test(userAgent) || /android/.test(userAgent)
+};
+
+
+function getAssoc(obj, name)
+{
+  return obj["_magicdom_" + name];
+}
+
+function setAssoc(obj, name, value)
+{
+  // note that in IE designMode, properties of a node can get
+  // copied to new nodes that are spawned during editing; also,
+  // properties representable in HTML text can survive copy-and-paste
+  obj["_magicdom_" + name] = value;
+}
+
+// "func" is a function over 0..(numItems-1) that is monotonically
+// "increasing" with index (false, then true).  Finds the boundary
+// between false and true, a number between 0 and numItems inclusive.
+
+
+function binarySearch(numItems, func)
+{
+  if (numItems < 1) return 0;
+  if (func(0)) return 0;
+  if (!func(numItems - 1)) return numItems;
+  var low = 0; // func(low) is always false
+  var high = numItems - 1; // func(high) is always true
+  while ((high - low) > 1)
+  {
+    var x = Math.floor((low + high) / 2); // x != low, x != high
+    if (func(x)) high = x;
+    else low = x;
+  }
+  return high;
+}
+
+function binarySearchInfinite(expectedLength, func)
+{
+  var i = 0;
+  while (!func(i)) i += expectedLength;
+  return binarySearch(i, func);
+}
+
+function htmlPrettyEscape(str)
+{
+  return Security.escapeHTML(str).replace(/\r?\n/g, '\\n');
+}
+
+var noop = function(){};
+
+exports.isNodeText = isNodeText;
+exports.object = object;
+exports.browser = browser;
+exports.getAssoc = getAssoc;
+exports.setAssoc = setAssoc;
+exports.binarySearch = binarySearch;
+exports.binarySearchInfinite = binarySearchInfinite;
+exports.htmlPrettyEscape = htmlPrettyEscape;
+exports.noop = noop;