From fe59a8ce6226ab1839d9cc54d00799ef4c91030c Mon Sep 17 00:00:00 2001
From: Giulio Gratta <giulio@giuliogratta.com>
Date: Tue, 10 Sep 2013 09:30:54 -0700
Subject: [PATCH] Implementing NYT's ICE track changes to Open Ended
 Assessements

Squashed commits to facilitate cherry-picking.  Committers and
original commit messages are:
- ==> @caesar2164, * ==> @jrbl, ~ ==> @jbau

- Added boolean to OE problem CMS settings to turn on ICE track changes
- Added ICE init and tracking start/stop to HTML
- Conditional in Peer Grading HTML for ICE container
- CSS styling for ICE container and insertion/deletion elements
- Added class to track changes HTML
- Added ice.min.js as well as included it in the js requirements for peer grading
- Use track_changes in peer_grading_problem
* Refactor peer_grading_problem to lookup track_changes variable by problem location.
* Whitelist ICE insert, delete tags
* Adds ICE multi-user-editor insert and delete tags to the peer grading sanitize_html whitelist.
- add reset button

* Introduction ICE means we need its inline tags to get passed through
  to the feedback target, but we don't want malicious peer feedback
  providers introducing <script>, etc, so we use lxml.html.clean to
  scrub peer grading input.
* Adds feedback URL autoheating.
* Allows ICE <insert> and <delete> tags but not others.

~ add helptext re: EXPERIMENTAL FEATURES

~ address a bunch of @VikParuchuri review comments on ICE for OEE
  ~ remove extraneous code
  ~ change to new xmodule accessors
  ~ refactor filtering

~ fix broken test test_peer_grading_problem

~ Create track_changes.coffee and remove <script> from
  peer_grading_problem.html
~ Remove all reliance on id in favor of local scoping and classes

~ bring up test coverage somewhat

~ remove superflous $.scrollTo

~ TODO: Filtering
---
 .../xmodule/combined_open_ended_module.py     |   8 +
 .../css/combinedopenended/display.scss        |  19 ++
 .../xmodule/js/src/peergrading/ice.min.js     | 224 ++++++++++++++++++
 .../peergrading/peer_grading_problem.coffee   |  28 ++-
 .../js/src/peergrading/track_changes.coffee   |  47 ++++
 .../xmodule/xmodule/peer_grading_module.py    |  40 ++--
 .../xmodule/tests/test_peer_grading.py        |  48 +++-
 lms/static/sass/course/_staff_grading.scss    |  26 ++
 .../peer_grading/peer_grading_problem.html    |  20 +-
 9 files changed, 430 insertions(+), 30 deletions(-)
 create mode 100644 common/lib/xmodule/xmodule/js/src/peergrading/ice.min.js
 create mode 100644 common/lib/xmodule/xmodule/js/src/peergrading/track_changes.coffee

diff --git a/common/lib/xmodule/xmodule/combined_open_ended_module.py b/common/lib/xmodule/xmodule/combined_open_ended_module.py
index c6dc882bb6..10a5e61519 100644
--- a/common/lib/xmodule/xmodule/combined_open_ended_module.py
+++ b/common/lib/xmodule/xmodule/combined_open_ended_module.py
@@ -234,6 +234,14 @@ class CombinedOpenEndedFields(object):
         default=False,
         scope=Scope.settings
     )
+    track_changes = Boolean(
+        display_name="Peer Track Changes",
+        help=("EXPERIMENTAL FEATURE FOR PEER GRADING ONLY:  "
+              "If set to 'True', peer graders will be able to make changes to the student "
+              "submission and those changes will be tracked and shown along with the graded feedback."),
+        default=False,
+        scope=Scope.settings
+    )
     due = Date(
         help="Date that this problem is due by",
         scope=Scope.settings
diff --git a/common/lib/xmodule/xmodule/css/combinedopenended/display.scss b/common/lib/xmodule/xmodule/css/combinedopenended/display.scss
index 2bd398fa3d..7b61e59dbd 100644
--- a/common/lib/xmodule/xmodule/css/combinedopenended/display.scss
+++ b/common/lib/xmodule/xmodule/css/combinedopenended/display.scss
@@ -40,6 +40,25 @@ div.name{
 
 section.combined-open-ended {
   @include clearfix;
+  
+  .written-feedback {
+    position: relative;
+    margin: 0px;
+    height: 150px;
+    border: 1px solid lightgray;
+    padding: 5px;
+    resize: vertical;
+    width: 99%;
+    overflow: auto;
+    
+    .del {
+      text-decoration: line-through;
+      background-color: #ffc3c3;
+    }
+    .ins {
+      background-color: #c3ffc3;
+    }
+  }
 }
 
 
diff --git a/common/lib/xmodule/xmodule/js/src/peergrading/ice.min.js b/common/lib/xmodule/xmodule/js/src/peergrading/ice.min.js
new file mode 100644
index 0000000000..7b83d82298
--- /dev/null
+++ b/common/lib/xmodule/xmodule/js/src/peergrading/ice.min.js
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+this.ec?this.eo:a.length,d!=b&&a.deleteData(d,b-d)):a.parentNode&&a.parentNode.removeChild(a)},isPartiallySelectedSubtree:function(){return b(this._current,this.range)},getSubtreeIterator:function(){var d;if(this.isSingleCharacterDataNode)d=this.range.cloneRange(),d.collapse();else{d=new E(a(this.range));var b=this._current,f=b,e=0,g=b,y=m.getNodeLength(b);if(m.isAncestorOf(b,this.sc,!0))f=this.sc,e=this.so;if(m.isAncestorOf(b,this.ec,!0))g=this.ec,y=this.eo;N(d,f,e,g,y)}return new k(d,this.clonePartiallySelectedTextNodes)},
+detach:function(a){a&&this.range.detach();this.range=this._current=this._next=this._first=this._last=this.sc=this.so=this.ec=this.eo=null}};r.prototype={BAD_BOUNDARYPOINTS_ERR:1,INVALID_NODE_TYPE_ERR:2};r.prototype.toString=function(){return this.message};j.prototype={_current:null,hasNext:function(){return!!this._next},next:function(){this._current=this._next;this._next=this.nodes[++this._position];return this._current},detach:function(){this._current=this._next=this.nodes=null}};var O=[1,3,4,5,
+7,8,10],J=[2,9,11],Q=[1,3,4,5,7,8,10,11],L=[1,3,4,5,7,8],y=m.getRootContainer,M=q([9,11]),$=q([5,6,10,12]),Z=q([6,10,12]),T=["startContainer","startOffset","endContainer","endOffset","collapsed","commonAncestorContainer"],R=0,U=1,aa=2,V=3,W=0,X=1,Y=2,S=3;H.prototype={attachListener:function(a,d){this._listeners[a].push(d)},compareBoundaryPoints:function(a,d){w(this);B(this.startContainer,d.startContainer);var b=a==V||a==R?"start":"end",f=a==U||a==R?"start":"end";return m.comparePoints(this[b+"Container"],
+this[b+"Offset"],d[f+"Container"],d[f+"Offset"])},insertNode:function(a){w(this);x(a,Q);A(this.startContainer);if(m.isAncestorOf(a,this.startContainer,!0))throw new D("HIERARCHY_REQUEST_ERR");this.setStartBefore(h(a,this.startContainer,this.startOffset))},cloneContents:function(){w(this);var d,b;if(this.collapsed)return a(this).createDocumentFragment();else{if(this.startContainer===this.endContainer&&m.isCharacterDataNode(this.startContainer))return d=this.startContainer.cloneNode(!0),d.data=d.data.slice(this.startOffset,
+this.endOffset),b=a(this).createDocumentFragment(),b.appendChild(d),b;else b=new k(this,!0),d=i(b),b.detach();return d}},canSurroundContents:function(){w(this);A(this.startContainer);A(this.endContainer);var a=new k(this,!0),d=a._first&&b(a._first,this)||a._last&&b(a._last,this);a.detach();return!d},surroundContents:function(a){x(a,L);if(!this.canSurroundContents())throw new r("BAD_BOUNDARYPOINTS_ERR");var d=this.extractContents();if(a.hasChildNodes())for(;a.lastChild;)a.removeChild(a.lastChild);
+h(a,this.startContainer,this.startOffset);a.appendChild(d);this.selectNode(a)},cloneRange:function(){w(this);for(var d=new E(a(this)),b=T.length,f;b--;)f=T[b],d[f]=this[f];return d},toString:function(){w(this);var a=this.startContainer;if(a===this.endContainer&&m.isCharacterDataNode(a))return a.nodeType==3||a.nodeType==4?a.data.slice(this.startOffset,this.endOffset):"";else{var d=[],a=new k(this,!0);l(a,function(a){(a.nodeType==3||a.nodeType==4)&&d.push(a.data)});a.detach();return d.join("")}},compareNode:function(a){w(this);
+var d=a.parentNode,b=m.getNodeIndex(a);if(!d)throw new D("NOT_FOUND_ERR");a=this.comparePoint(d,b);d=this.comparePoint(d,b+1);return a<0?d>0?Y:W:d>0?X:S},comparePoint:function(a,d){w(this);z(a,"HIERARCHY_REQUEST_ERR");B(a,this.startContainer);if(m.comparePoints(a,d,this.startContainer,this.startOffset)<0)return-1;else if(m.comparePoints(a,d,this.endContainer,this.endOffset)>0)return 1;return 0},createContextualFragment:function(d){p(this);var b=a(this),f=b.createElement("div");f.innerHTML=d;for(d=
+b.createDocumentFragment();b=f.firstChild;)d.appendChild(b);return d},toHtml:function(){w(this);var d=a(this).createElement("div");d.appendChild(this.cloneContents());return d.innerHTML},intersectsNode:function(d,b){w(this);z(d,"NOT_FOUND_ERR");if(m.getDocument(d)!==a(this))return!1;var f=d.parentNode,e=m.getNodeIndex(d);z(f,"NOT_FOUND_ERR");var g=m.comparePoints(f,e,this.endContainer,this.endOffset),f=m.comparePoints(f,e+1,this.startContainer,this.startOffset);return b?g<=0&&f>=0:g<0&&f>0},isPointInRange:function(a,
+d){w(this);z(a,"HIERARCHY_REQUEST_ERR");B(a,this.startContainer);return m.comparePoints(a,d,this.startContainer,this.startOffset)>=0&&m.comparePoints(a,d,this.endContainer,this.endOffset)<=0},intersectsRange:function(d,b){w(this);if(a(d)!=a(this))throw new D("WRONG_DOCUMENT_ERR");var f=m.comparePoints(this.startContainer,this.startOffset,d.endContainer,d.endOffset),e=m.comparePoints(this.endContainer,this.endOffset,d.startContainer,d.startOffset);return b?f<=0&&e>=0:f<0&&e>0},intersection:function(a){if(this.intersectsRange(a)){var d=
+m.comparePoints(this.startContainer,this.startOffset,a.startContainer,a.startOffset),b=m.comparePoints(this.endContainer,this.endOffset,a.endContainer,a.endOffset),f=this.cloneRange();d==-1&&f.setStart(a.startContainer,a.startOffset);b==1&&f.setEnd(a.endContainer,a.endOffset);return f}return null},union:function(a){if(this.intersectsRange(a,!0)){var d=this.cloneRange();m.comparePoints(a.startContainer,a.startOffset,this.startContainer,this.startOffset)==-1&&d.setStart(a.startContainer,a.startOffset);
+m.comparePoints(a.endContainer,a.endOffset,this.endContainer,this.endOffset)==1&&d.setEnd(a.endContainer,a.endOffset);return d}else throw new r("Ranges do not intersect");},containsNode:function(a,d){return d?this.intersectsNode(a,!1):this.compareNode(a)==S},containsNodeContents:function(a){return this.comparePoint(a,0)>=0&&this.comparePoint(a,m.getNodeLength(a))<=0},containsRange:function(a){return this.intersection(a).equals(a)},containsNodeText:function(a){var d=this.cloneRange();d.selectNode(a);
+var b=d.getNodes([3]);return b.length>0?(d.setStart(b[0],0),a=b.pop(),d.setEnd(a,a.length),a=this.containsRange(d),d.detach(),a):this.containsNodeContents(a)},createNodeIterator:function(a,d){w(this);return new j(this,a,d)},getNodes:function(a,d){w(this);return s(this,a,d)},getDocument:function(){return a(this)},collapseBefore:function(a){p(this);this.setEndBefore(a);this.collapse(!1)},collapseAfter:function(a){p(this);this.setStartAfter(a);this.collapse(!0)},getName:function(){return"DomRange"},
+equals:function(a){return E.rangesEqual(this,a)},inspect:function(){return o(this)}};C(E,N,function(a){p(a);a.startContainer=a.startOffset=a.endContainer=a.endOffset=null;a.collapsed=a.commonAncestorContainer=null;d(a,"detach",null);a._listeners=null});e.rangePrototype=H.prototype;E.rangeProperties=T;E.RangeIterator=k;E.copyComparisonConstants=I;E.createPrototypeRange=C;E.inspect=o;E.getRangeDocument=a;E.rangesEqual=function(a,d){return a.startContainer===d.startContainer&&a.startOffset===d.startOffset&&
+a.endContainer===d.endContainer&&a.endOffset===d.endOffset};e.DomRange=E;e.RangeException=r});
+rangy.createModule("WrappedRange",function(e){function b(a,d,b,e){var h=a.duplicate();h.collapse(b);var k=h.parentElement();f.isAncestorOf(d,k,!0)||(k=d);if(!k.canHaveHTML)return new g(k.parentNode,f.getNodeIndex(k));var d=f.getDocument(k).createElement("span"),r,j=b?"StartToStart":"StartToEnd";do k.insertBefore(d,d.previousSibling),h.moveToElementText(d);while((r=h.compareEndPoints(j,a))>0&&d.previousSibling);j=d.nextSibling;if(r==-1&&j&&f.isCharacterDataNode(j)){h.setEndPoint(b?"EndToStart":"EndToEnd",
+a);if(/[\r\n]/.test(j.data)){k=h.duplicate();b=k.text.replace(/\r\n/g,"\r").length;for(b=k.moveStart("character",b);k.compareEndPoints("StartToEnd",k)==-1;)b++,k.moveStart("character",1)}else b=h.text.length;k=new g(j,b)}else j=(e||!b)&&d.previousSibling,k=(b=(e||b)&&d.nextSibling)&&f.isCharacterDataNode(b)?new g(b,0):j&&f.isCharacterDataNode(j)?new g(j,j.length):new g(k,f.getNodeIndex(d));d.parentNode.removeChild(d);return k}function a(a,d){var b,e,g=a.offset,h=f.getDocument(a.node),r=h.body.createTextRange(),
+j=f.isCharacterDataNode(a.node);j?(b=a.node,e=b.parentNode):(b=a.node.childNodes,b=g<b.length?b[g]:null,e=a.node);h=h.createElement("span");h.innerHTML="&#feff;";b?e.insertBefore(h,b):e.appendChild(h);r.moveToElementText(h);r.collapse(!d);e.removeChild(h);if(j)r[d?"moveStart":"moveEnd"]("character",g);return r}e.requireModules(["DomUtil","DomRange"]);var d,f=e.dom,g=f.DomPosition,h=e.DomRange;if(e.features.implementsDomRange&&(!e.features.implementsTextRange||!e.config.preferTextRange))(function(){function a(d){for(var b=
+e.length,f;b--;)f=e[b],d[f]=d.nativeRange[f]}var b,e=h.rangeProperties,g;d=function(d){if(!d)throw Error("Range must be specified");this.nativeRange=d;a(this)};h.createPrototypeRange(d,function(a,d,b,f,e){var g=a.endContainer!==f||a.endOffset!=e;if(a.startContainer!==d||a.startOffset!=b||g)a.setEnd(f,e),a.setStart(d,b)},function(a){a.nativeRange.detach();a.detached=!0;for(var d=e.length,b;d--;)b=e[d],a[b]=null});b=d.prototype;b.selectNode=function(d){this.nativeRange.selectNode(d);a(this)};b.deleteContents=
+function(){this.nativeRange.deleteContents();a(this)};b.extractContents=function(){var d=this.nativeRange.extractContents();a(this);return d};b.cloneContents=function(){return this.nativeRange.cloneContents()};b.surroundContents=function(d){this.nativeRange.surroundContents(d);a(this)};b.collapse=function(d){this.nativeRange.collapse(d);a(this)};b.cloneRange=function(){return new d(this.nativeRange.cloneRange())};b.refresh=function(){a(this)};b.toString=function(){return this.nativeRange.toString()};
+var i=document.createTextNode("test");f.getBody(document).appendChild(i);var k=document.createRange();k.setStart(i,0);k.setEnd(i,0);try{k.setStart(i,1),b.setStart=function(d,b){this.nativeRange.setStart(d,b);a(this)},b.setEnd=function(d,b){this.nativeRange.setEnd(d,b);a(this)},g=function(d){return function(b){this.nativeRange[d](b);a(this)}}}catch(r){b.setStart=function(d,b){try{this.nativeRange.setStart(d,b)}catch(f){this.nativeRange.setEnd(d,b),this.nativeRange.setStart(d,b)}a(this)},b.setEnd=function(d,
+b){try{this.nativeRange.setEnd(d,b)}catch(f){this.nativeRange.setStart(d,b),this.nativeRange.setEnd(d,b)}a(this)},g=function(d,b){return function(f){try{this.nativeRange[d](f)}catch(e){this.nativeRange[b](f),this.nativeRange[d](f)}a(this)}}}b.setStartBefore=g("setStartBefore","setEndBefore");b.setStartAfter=g("setStartAfter","setEndAfter");b.setEndBefore=g("setEndBefore","setStartBefore");b.setEndAfter=g("setEndAfter","setStartAfter");k.selectNodeContents(i);b.selectNodeContents=k.startContainer==
+i&&k.endContainer==i&&k.startOffset==0&&k.endOffset==i.length?function(d){this.nativeRange.selectNodeContents(d);a(this)}:function(a){this.setStart(a,0);this.setEnd(a,h.getEndOffset(a))};k.selectNodeContents(i);k.setEnd(i,3);g=document.createRange();g.selectNodeContents(i);g.setEnd(i,4);g.setStart(i,2);b.compareBoundaryPoints=k.compareBoundaryPoints(k.START_TO_END,g)==-1&k.compareBoundaryPoints(k.END_TO_START,g)==1?function(a,d){d=d.nativeRange||d;if(a==d.START_TO_END)a=d.END_TO_START;else if(a==
+d.END_TO_START)a=d.START_TO_END;return this.nativeRange.compareBoundaryPoints(a,d)}:function(a,d){return this.nativeRange.compareBoundaryPoints(a,d.nativeRange||d)};f.getBody(document).removeChild(i);k.detach();g.detach()})(),e.createNativeRange=function(a){return(a||document).createRange()};else if(e.features.implementsTextRange){d=function(a){this.textRange=a;this.refresh()};d.prototype=new h(document);d.prototype.refresh=function(){var a,d,e=this.textRange;a=e.parentElement();var g=e.duplicate();
+g.collapse(!0);d=g.parentElement();g=e.duplicate();g.collapse(!1);e=g.parentElement();d=d==e?d:f.getCommonAncestor(d,e);d=d==a?d:f.getCommonAncestor(a,d);this.textRange.compareEndPoints("StartToEnd",this.textRange)==0?d=a=b(this.textRange,d,!0,!0):(a=b(this.textRange,d,!0,!1),d=b(this.textRange,d,!1,!1));this.setStart(a.node,a.offset);this.setEnd(d.node,d.offset)};h.copyComparisonConstants(d);var i=function(){return this}();if(typeof i.Range=="undefined")i.Range=d;e.createNativeRange=function(a){return(a||
+document).body.createTextRange()}}if(e.features.implementsTextRange)d.rangeToTextRange=function(d){if(d.collapsed)return a(new g(d.startContainer,d.startOffset),!0);else{var b=a(new g(d.startContainer,d.startOffset),!0),e=a(new g(d.endContainer,d.endOffset),!1),d=f.getDocument(d.startContainer).body.createTextRange();d.setEndPoint("StartToStart",b);d.setEndPoint("EndToEnd",e);return d}};d.prototype.getName=function(){return"WrappedRange"};e.WrappedRange=d;e.createRange=function(a){return new d(e.createNativeRange(a||
+document))};e.createRangyRange=function(a){return new h(a||document)};e.createIframeRange=function(a){return e.createRange(f.getIframeDocument(a))};e.createIframeRangyRange=function(a){return e.createRangyRange(f.getIframeDocument(a))};e.addCreateMissingNativeApiListener(function(a){a=a.document;if(typeof a.createRange=="undefined")a.createRange=function(){return e.createRange(this)};a=a=null})});
+rangy.createModule("WrappedSelection",function(e,b){function a(a){return(a||window).getSelection()}function d(a){return(a||window).document.selection}function f(a,d,b){var f=b?"end":"start",b=b?"start":"end";a.anchorNode=d[f+"Container"];a.anchorOffset=d[f+"Offset"];a.focusNode=d[b+"Container"];a.focusOffset=d[b+"Offset"]}function g(a){a.anchorNode=a.focusNode=null;a.anchorOffset=a.focusOffset=0;a.rangeCount=0;a.isCollapsed=!0;a._ranges.length=0}function h(a){var d;if(a instanceof v){if(d=a._selectionNativeRange,
+!d)d=e.createNativeRange(j.getDocument(a.startContainer)),d.setEnd(a.endContainer,a.endOffset),d.setStart(a.startContainer,a.startOffset),a._selectionNativeRange=d,a.attachListener("detach",function(){this._selectionNativeRange=null})}else a instanceof p?d=a.nativeRange:e.features.implementsDomRange&&a instanceof j.getWindow(a.startContainer).Range&&(d=a);return d}function i(a){var d=a.getNodes(),b;a:if(!d.length||d[0].nodeType!=1)b=!1;else{b=1;for(var f=d.length;b<f;++b)if(!j.isAncestorOf(d[0],d[b])){b=
+!1;break a}b=!0}if(!b)throw Error("getSingleElementFromRange: range "+a.inspect()+" did not consist of a single element");return d[0]}function l(a,d){var b=new p(d);a._ranges=[b];f(a,b,!1);a.rangeCount=1;a.isCollapsed=b.collapsed}function t(a){a._ranges.length=0;if(a.docSelection.type=="None")g(a);else{var d=a.docSelection.createRange();if(d&&typeof d.text!="undefined")l(a,d);else{a.rangeCount=d.length;for(var b,h=j.getDocument(d.item(0)),C=0;C<a.rangeCount;++C)b=e.createRange(h),b.selectNode(d.item(C)),
+a._ranges.push(b);a.isCollapsed=a.rangeCount==1&&a._ranges[0].collapsed;f(a,a._ranges[a.rangeCount-1],!1)}}}function n(a,d){for(var b=a.docSelection.createRange(),f=i(d),e=j.getDocument(b.item(0)),e=j.getBody(e).createControlRange(),g=0,h=b.length;g<h;++g)e.add(b.item(g));try{e.add(f)}catch(C){throw Error("addRange(): Element within the specified Range could not be added to control selection (does it have layout?)");}e.select();t(a)}function s(a,d,b){this.nativeSelection=a;this.docSelection=d;this._ranges=
+[];this.win=b;this.refresh()}function o(a,d){for(var b=j.getDocument(d[0].startContainer),b=j.getBody(b).createControlRange(),f=0,e;f<rangeCount;++f){e=i(d[f]);try{b.add(e)}catch(g){throw Error("setRanges(): Element within the one of the specified Ranges could not be added to control selection (does it have layout?)");}}b.select();t(a)}function k(a,d){if(a.anchorNode&&j.getDocument(a.anchorNode)!==j.getDocument(d))throw new x("WRONG_DOCUMENT_ERR");}function r(a){var d=[],b=new F(a.anchorNode,a.anchorOffset),
+f=new F(a.focusNode,a.focusOffset),e=typeof a.getName=="function"?a.getName():"Selection";if(typeof a.rangeCount!="undefined")for(var g=0,h=a.rangeCount;g<h;++g)d[g]=v.inspect(a.getRangeAt(g));return"["+e+"(Ranges: "+d.join(", ")+")(anchor: "+b.inspect()+", focus: "+f.inspect()+"]"}e.requireModules(["DomUtil","DomRange","WrappedRange"]);e.config.checkSelectionRanges=!0;var j=e.dom,q=e.util,v=e.DomRange,p=e.WrappedRange,x=e.DOMException,F=j.DomPosition,B,A,z=e.util.isHostMethod(window,"getSelection"),
+w=e.util.isHostObject(document,"selection"),H=w&&(!z||e.config.preferTextRange);H?(B=d,e.isSelectionValid=function(a){var a=(a||window).document,d=a.selection;return d.type!="None"||j.getDocument(d.createRange().parentElement())==a}):z?(B=a,e.isSelectionValid=function(){return!0}):b.fail("Neither document.selection or window.getSelection() detected.");e.getNativeSelection=B;var z=B(),K=e.createNativeRange(document),I=j.getBody(document),G=q.areHostObjects(z,q.areHostProperties(z,["anchorOffset","focusOffset"]));
+e.features.selectionHasAnchorAndFocus=G;var C=q.isHostMethod(z,"extend");e.features.selectionHasExtend=C;var P=typeof z.rangeCount=="number";e.features.selectionHasRangeCount=P;var N=!1,E=!0;q.areHostMethods(z,["addRange","getRangeAt","removeAllRanges"])&&typeof z.rangeCount=="number"&&e.features.implementsDomRange&&function(){var a=document.createElement("iframe");I.appendChild(a);var d=j.getIframeDocument(a);d.open();d.write("<html><head></head><body>12</body></html>");d.close();var b=j.getIframeWindow(a).getSelection(),
+f=d.documentElement.lastChild.firstChild,d=d.createRange();d.setStart(f,1);d.collapse(!0);b.addRange(d);E=b.rangeCount==1;b.removeAllRanges();var e=d.cloneRange();d.setStart(f,0);e.setEnd(f,2);b.addRange(d);b.addRange(e);N=b.rangeCount==2;d.detach();e.detach();I.removeChild(a)}();e.features.selectionSupportsMultipleRanges=N;e.features.collapsedNonEditableSelectionsSupported=E;var m=!1,u;I&&q.isHostMethod(I,"createControlRange")&&(u=I.createControlRange(),q.areHostProperties(u,["item","add"])&&(m=
+!0));e.features.implementsControlRange=m;A=G?function(a){return a.anchorNode===a.focusNode&&a.anchorOffset===a.focusOffset}:function(a){return a.rangeCount?a.getRangeAt(a.rangeCount-1).collapsed:!1};var D;q.isHostMethod(z,"getRangeAt")?D=function(a,d){try{return a.getRangeAt(d)}catch(b){return null}}:G&&(D=function(a){var d=j.getDocument(a.anchorNode),d=e.createRange(d);d.setStart(a.anchorNode,a.anchorOffset);d.setEnd(a.focusNode,a.focusOffset);d.collapsed!==this.isCollapsed&&(d.setStart(a.focusNode,
+a.focusOffset),d.setEnd(a.anchorNode,a.anchorOffset));return d});e.getSelection=function(a){var a=a||window,b=a._rangySelection,f=B(a),e=w?d(a):null;b?(b.nativeSelection=f,b.docSelection=e,b.refresh(a)):(b=new s(f,e,a),a._rangySelection=b);return b};e.getIframeSelection=function(a){return e.getSelection(j.getIframeWindow(a))};u=s.prototype;if(!H&&G&&q.areHostMethods(z,["removeAllRanges","addRange"])){u.removeAllRanges=function(){this.nativeSelection.removeAllRanges();g(this)};var O=function(a,d){var b=
+v.getRangeDocument(d),b=e.createRange(b);b.collapseToPoint(d.endContainer,d.endOffset);a.nativeSelection.addRange(h(b));a.nativeSelection.extend(d.startContainer,d.startOffset);a.refresh()};u.addRange=P?function(a,d){if(m&&w&&this.docSelection.type=="Control")n(this,a);else if(d&&C)O(this,a);else{var b;N?b=this.rangeCount:(this.removeAllRanges(),b=0);this.nativeSelection.addRange(h(a));this.rangeCount=this.nativeSelection.rangeCount;this.rangeCount==b+1?(e.config.checkSelectionRanges&&(b=D(this.nativeSelection,
+this.rangeCount-1))&&!v.rangesEqual(b,a)&&(a=new p(b)),this._ranges[this.rangeCount-1]=a,f(this,a,L(this.nativeSelection)),this.isCollapsed=A(this)):this.refresh()}}:function(a,d){d&&C?O(this,a):(this.nativeSelection.addRange(h(a)),this.refresh())};u.setRanges=function(a){if(m&&a.length>1)o(this,a);else{this.removeAllRanges();for(var d=0,b=a.length;d<b;++d)this.addRange(a[d])}}}else if(q.isHostMethod(z,"empty")&&q.isHostMethod(K,"select")&&m&&H)u.removeAllRanges=function(){try{if(this.docSelection.empty(),
+this.docSelection.type!="None"){var a;if(this.anchorNode)a=j.getDocument(this.anchorNode);else if(this.docSelection.type=="Control"){var d=this.docSelection.createRange();d.length&&(a=j.getDocument(d.item(0)).body.createTextRange())}a&&(a.body.createTextRange().select(),this.docSelection.empty())}}catch(b){}g(this)},u.addRange=function(a){this.docSelection.type=="Control"?n(this,a):(p.rangeToTextRange(a).select(),this._ranges[0]=a,this.rangeCount=1,this.isCollapsed=this._ranges[0].collapsed,f(this,
+a,!1))},u.setRanges=function(a){this.removeAllRanges();var d=a.length;d>1?o(this,a):d&&this.addRange(a[0])};else return b.fail("No means of selecting a Range or TextRange was found"),!1;u.getRangeAt=function(a){if(a<0||a>=this.rangeCount)throw new x("INDEX_SIZE_ERR");else return this._ranges[a]};var J;if(H)J=function(a){var d;e.isSelectionValid(a.win)?d=a.docSelection.createRange():(d=j.getBody(a.win.document).createTextRange(),d.collapse(!0));a.docSelection.type=="Control"?t(a):d&&typeof d.text!=
+"undefined"?l(a,d):g(a)};else if(q.isHostMethod(z,"getRangeAt")&&typeof z.rangeCount=="number")J=function(a){if(m&&w&&a.docSelection.type=="Control")t(a);else if(a._ranges.length=a.rangeCount=a.nativeSelection.rangeCount,a.rangeCount){for(var d=0,b=a.rangeCount;d<b;++d)a._ranges[d]=new e.WrappedRange(a.nativeSelection.getRangeAt(d));f(a,a._ranges[a.rangeCount-1],L(a.nativeSelection));a.isCollapsed=A(a)}else g(a)};else if(G&&typeof z.isCollapsed=="boolean"&&typeof K.collapsed=="boolean"&&e.features.implementsDomRange)J=
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+this._ranges[0];this.collapse(a.startContainer,a.startOffset)}else throw new x("INVALID_STATE_ERR");};u.collapseToEnd=function(){if(this.rangeCount){var a=this._ranges[this.rangeCount-1];this.collapse(a.endContainer,a.endOffset)}else throw new x("INVALID_STATE_ERR");};u.selectAllChildren=function(a){k(this,a);var d=e.createRange(j.getDocument(a));d.selectNodeContents(a);this.removeAllRanges();this.addRange(d)};u.deleteFromDocument=function(){if(m&&w&&this.docSelection.type=="Control"){for(var a=this.docSelection.createRange(),
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+v.getRangeDocument(this._ranges[0]).createElement("div"),d=0,b=this._ranges.length;d<b;++d)a.appendChild(this._ranges[d].cloneContents());a=a.innerHTML}return a};u.getName=function(){return"WrappedSelection"};u.inspect=function(){return r(this)};u.detach=function(){this.win=this.anchorNode=this.focusNode=this.win._rangySelection=null};s.inspect=r;e.Selection=s;e.selectionPrototype=u;e.addCreateMissingNativeApiListener(function(a){if(typeof a.getSelection=="undefined")a.getSelection=function(){return e.getSelection(this)};
+a=null})});
+rangy.createModule("CssClassApplier",function(e,b){function a(a,d){return a.className&&RegExp("(?:^|\\s)"+d+"(?:\\s|$)").test(a.className)}function d(d,b){d.className?a(d,b)||(d.className+=" "+b):d.className=b}function f(a){return a.split(/\s+/).sort().join(" ")}function g(a,d){return f(a.className)==f(d.className)}function h(a){for(var d=a.parentNode;a.hasChildNodes();)d.insertBefore(a.firstChild,a);d.removeChild(a)}function i(a,d){var b=a.cloneRange();b.selectNodeContents(d);var f=b.intersection(a),f=
+f?f.toString():"";b.detach();return f!=""}function l(a){return a.getNodes([3],function(d){return i(a,d)})}function t(a,d){if(a.attributes.length!=d.attributes.length)return!1;for(var b=0,f=a.attributes.length,e,g;b<f;++b)if(e=a.attributes[b],g=e.name,g!="class"){g=d.attributes.getNamedItem(g);if(e.specified!=g.specified)return!1;if(e.specified&&e.nodeValue!==g.nodeValue)return!1}return!0}function n(a,d){for(var b=0,f=a.attributes.length,e;b<f;++b)if(e=a.attributes[b].name,(!d||!x.arrayContains(d,
+e))&&a.attributes[b].specified&&e!="class")return!0;return!1}function s(a){var d;return a&&a.nodeType==1&&((d=a.parentNode)&&d.nodeType==9&&d.designMode=="on"||A(a)&&!A(a.parentNode))}function o(a){return(A(a)||a.nodeType!=1&&A(a.parentNode))&&!s(a)}function k(a){return a&&a.nodeType==1&&!z.test(B(a,"display"))}function r(a){if(a.data.length==0)return!0;if(w.test(a.data))return!1;switch(B(a.parentNode,"whiteSpace")){case "pre":case "pre-wrap":case "-moz-pre-wrap":return!1;case "pre-line":if(/[\r\n]/.test(a.data))return!1}return k(a.previousSibling)||
+k(a.nextSibling)}function j(a,d,f,e){var g,h=f==0;if(x.isAncestorOf(d,a))throw b.createError("descendant is ancestor of node");if(x.isCharacterDataNode(d))if(f==0)f=x.getNodeIndex(d),d=d.parentNode;else if(f==d.length)f=x.getNodeIndex(d)+1,d=d.parentNode;else throw b.createError("splitNodeAt should not be called with offset in the middle of a data node ("+f+" in "+d.data);if(x.isCharacterDataNode(d)?f==0?d.previousSibling:f==d.length?d.nextSibling:1:f>0&&f<d.childNodes.length){if(!g){g=d.cloneNode(!1);
+for(g.id&&g.removeAttribute("id");h=d.childNodes[f];)g.appendChild(h);x.insertAfter(g,d)}return d==a?g:j(a,g.parentNode,x.getNodeIndex(g),e)}else if(a!=d)return g=d.parentNode,d=x.getNodeIndex(d),h||d++,j(a,g,d,e);return a}function q(a){var d=a?"nextSibling":"previousSibling";return function(b,f){var e=b.parentNode,h=b[d];if(h){if(h&&h.nodeType==3)return h}else if(f&&(h=e[d])&&h.nodeType==1&&e.tagName==h.tagName&&g(e,h)&&t(e,h))return h[a?"firstChild":"lastChild"];return null}}function v(a){this.firstTextNode=
+(this.isElementMerge=a.nodeType==1)?a.lastChild:a;this.textNodes=[this.firstTextNode]}function p(a,d,b){this.cssClass=a;var e,g,h=null;if(typeof d=="object"&&d!==null){b=d.tagNames;h=d.elementProperties;for(e=0;g=I[e++];)d.hasOwnProperty(g)&&(this[g]=d[g]);e=d.normalize}else e=d;this.normalize=typeof e=="undefined"?!0:e;this.attrExceptions=[];e=document.createElement(this.elementTagName);this.elementProperties={};for(var j in h)h.hasOwnProperty(j)&&(G.hasOwnProperty(j)&&(j=G[j]),e[j]=h[j],this.elementProperties[j]=
+e[j],this.attrExceptions.push(j));this.elementSortedClassName=this.elementProperties.hasOwnProperty("className")?f(this.elementProperties.className+" "+a):a;this.applyToAnyTagName=!1;a=typeof b;if(a=="string")b=="*"?this.applyToAnyTagName=!0:this.tagNames=b.toLowerCase().replace(/^\s\s*/,"").replace(/\s\s*$/,"").split(/\s*,\s*/);else if(a=="object"&&typeof b.length=="number"){this.tagNames=[];e=0;for(a=b.length;e<a;++e)b[e]=="*"?this.applyToAnyTagName=!0:this.tagNames.push(b[e].toLowerCase())}else this.tagNames=
+[this.elementTagName]}e.requireModules(["WrappedSelection","WrappedRange"]);var x=e.dom,F=function(){function a(d,b,f){return b&&f?" ":""}return function(d,b){if(d.className)d.className=d.className.replace(RegExp("(?:^|\\s)"+b+"(?:\\s|$)"),a)}}(),B;typeof window.getComputedStyle!="undefined"?B=function(a,d){return x.getWindow(a).getComputedStyle(a,null)[d]}:typeof document.documentElement.currentStyle!="undefined"?B=function(a,d){return a.currentStyle[d]}:b.fail("No means of obtaining computed style properties found");
+var A;(function(){A=typeof document.createElement("div").isContentEditable=="boolean"?function(a){return a&&a.nodeType==1&&a.isContentEditable}:function(a){return!a||a.nodeType!=1||a.contentEditable=="false"?!1:a.contentEditable=="true"||A(a.parentNode)}})();var z=/^inline(-block|-table)?$/i,w=/[^\r\n\t\f \u200B]/,H=q(!1),K=q(!0);v.prototype={doMerge:function(){for(var a=[],d,b,f=0,e=this.textNodes.length;f<e;++f)d=this.textNodes[f],b=d.parentNode,a[f]=d.data,f&&(b.removeChild(d),b.hasChildNodes()||
+b.parentNode.removeChild(b));return this.firstTextNode.data=a=a.join("")},getLength:function(){for(var a=this.textNodes.length,d=0;a--;)d+=this.textNodes[a].length;return d},toString:function(){for(var a=[],d=0,b=this.textNodes.length;d<b;++d)a[d]="'"+this.textNodes[d].data+"'";return"[Merge("+a.join(",")+")]"}};var I=["elementTagName","ignoreWhiteSpace","applyToEditableOnly"],G={"class":"className"};p.prototype={elementTagName:"span",elementProperties:{},ignoreWhiteSpace:!0,applyToEditableOnly:!1,
+hasClass:function(d){return d.nodeType==1&&x.arrayContains(this.tagNames,d.tagName.toLowerCase())&&a(d,this.cssClass)},getSelfOrAncestorWithClass:function(a){for(;a;){if(this.hasClass(a,this.cssClass))return a;a=a.parentNode}return null},isModifiable:function(a){return!this.applyToEditableOnly||o(a)},isIgnorableWhiteSpaceNode:function(a){return this.ignoreWhiteSpace&&a&&a.nodeType==3&&r(a)},postApply:function(a,d,b){for(var f=a[0],e=a[a.length-1],g=[],h,j=f,k=e,r=0,i=e.length,l,q,n=0,p=a.length;n<
+p;++n)if(l=a[n],q=H(l,!b)){h||(h=new v(q),g.push(h));h.textNodes.push(l);if(l===f)j=h.firstTextNode,r=j.length;if(l===e)k=h.firstTextNode,i=h.getLength()}else h=null;if(a=K(e,!b))h||(h=new v(e),g.push(h)),h.textNodes.push(a);if(g.length){n=0;for(p=g.length;n<p;++n)g[n].doMerge();d.setStart(j,r);d.setEnd(k,i)}},createContainer:function(a){a=a.createElement(this.elementTagName);e.util.extend(a,this.elementProperties);d(a,this.cssClass);return a},applyToTextNode:function(a){var b=a.parentNode;b.childNodes.length==
+1&&x.arrayContains(this.tagNames,b.tagName.toLowerCase())?d(b,this.cssClass):(b=this.createContainer(x.getDocument(a)),a.parentNode.insertBefore(b,a),b.appendChild(a))},isRemovable:function(a){var d;if(d=a.tagName.toLowerCase()==this.elementTagName)if(d=f(a.className)==this.elementSortedClassName){var b;a:{d=this.elementProperties;for(b in d)if(d.hasOwnProperty(b)&&a[b]!==d[b]){b=!1;break a}b=!0}d=b&&!n(a,this.attrExceptions)&&this.isModifiable(a)}return d},undoToTextNode:function(a,d,b){d.containsNode(b)||
+(a=d.cloneRange(),a.selectNode(b),a.isPointInRange(d.endContainer,d.endOffset)&&(j(b,d.endContainer,d.endOffset,[d]),d.setEndAfter(b)),a.isPointInRange(d.startContainer,d.startOffset)&&(b=j(b,d.startContainer,d.startOffset,[d])));this.isRemovable(b)?h(b):F(b,this.cssClass)},applyToRange:function(a){a.splitBoundaries();var d=l(a);if(d.length){for(var b,f=0,e=d.length;f<e;++f)b=d[f],!this.isIgnorableWhiteSpaceNode(b)&&!this.getSelfOrAncestorWithClass(b)&&this.isModifiable(b)&&this.applyToTextNode(b);
+a.setStart(d[0],0);b=d[d.length-1];a.setEnd(b,b.length);this.normalize&&this.postApply(d,a,!1)}},applyToSelection:function(a){var a=e.getSelection(a||window),d,b=a.getAllRanges();a.removeAllRanges();for(var f=b.length;f--;)d=b[f],this.applyToRange(d),a.addRange(d)},undoToRange:function(a){a.splitBoundaries();var d=l(a),b,f,e=d[d.length-1];if(d.length){for(var g=0,h=d.length;g<h;++g)b=d[g],(f=this.getSelfOrAncestorWithClass(b))&&this.isModifiable(b)&&this.undoToTextNode(b,a,f),a.setStart(d[0],0),a.setEnd(e,
+e.length);this.normalize&&this.postApply(d,a,!0)}},undoToSelection:function(a){var a=e.getSelection(a||window),d=a.getAllRanges(),b;a.removeAllRanges();for(var f=0,g=d.length;f<g;++f)b=d[f],this.undoToRange(b),a.addRange(b)},getTextSelectedByRange:function(a,d){var b=d.cloneRange();b.selectNodeContents(a);var f=b.intersection(d),f=f?f.toString():"";b.detach();return f},isAppliedToRange:function(a){if(a.collapsed)return!!this.getSelfOrAncestorWithClass(a.commonAncestorContainer);else{for(var d=a.getNodes([3]),
+b=0,f;f=d[b++];)if(!this.isIgnorableWhiteSpaceNode(f)&&i(a,f)&&this.isModifiable(f)&&!this.getSelfOrAncestorWithClass(f))return!1;return!0}},isAppliedToSelection:function(a){for(var a=e.getSelection(a||window).getAllRanges(),d=a.length;d--;)if(!this.isAppliedToRange(a[d]))return!1;return!0},toggleRange:function(a){this.isAppliedToRange(a)?this.undoToRange(a):this.applyToRange(a)},toggleSelection:function(a){this.isAppliedToSelection(a)?this.undoToSelection(a):this.applyToSelection(a)},detach:function(){}};
+p.util={hasClass:a,addClass:d,removeClass:F,hasSameClasses:g,replaceWithOwnChildren:h,elementsHaveSameNonClassAttributes:t,elementHasNonClassAttributes:n,splitNodeAt:j,isEditableElement:A,isEditingHost:s,isEditable:o};e.CssClassApplier=p;e.createCssClassApplier=function(a,d,b){return new p(a,d,b)}});
+rangy.createModule("SaveRestore",function(e,b){function a(a,d){var b="selectionBoundary_"+ +new Date+"_"+(""+Math.random()).slice(2),f,e=h.getDocument(a.startContainer),g=a.cloneRange();g.collapse(d);f=e.createElement("span");f.id=b;f.style.lineHeight="0";f.style.display="none";f.className="rangySelectionBoundary";f.appendChild(e.createTextNode(i));g.insertNode(f);g.detach();return f}function d(a,d,f,e){(a=(a||document).getElementById(f))?(d[e?"setStartBefore":"setEndBefore"](a),a.parentNode.removeChild(a)):
+b.warn("Marker element has been removed. Cannot restore selection.")}function f(a,d){return d.compareBoundaryPoints(a.START_TO_START,a)}function g(a,d){var b=(a||document).getElementById(d);b&&b.parentNode.removeChild(b)}e.requireModules(["DomUtil","DomRange","WrappedRange"]);var h=e.dom,i="\ufeff";e.saveSelection=function(d){var d=d||window,g=d.document;if(e.isSelectionValid(d)){var h=e.getSelection(d),i=h.getAllRanges(),o=[],k,r;i.sort(f);for(var j=0,q=i.length;j<q;++j)k=i[j],k.collapsed?(r=a(k,
+!1),o.push({markerId:r.id,collapsed:!0})):(r=a(k,!1),k=a(k,!0),o[j]={startMarkerId:k.id,endMarkerId:r.id,collapsed:!1,backwards:i.length==1&&h.isBackwards()});for(j=q-1;j>=0;--j)k=i[j],k.collapsed?k.collapseBefore((g||document).getElementById(o[j].markerId)):(k.setEndBefore((g||document).getElementById(o[j].endMarkerId)),k.setStartAfter((g||document).getElementById(o[j].startMarkerId)));h.setRanges(i);return{win:d,doc:g,rangeInfos:o,restored:!1}}else b.warn("Cannot save selection. This usually happens when the selection is collapsed and the selection document has lost focus.")};
+e.restoreSelection=function(a,f){if(!a.restored){for(var g=a.rangeInfos,h=e.getSelection(a.win),i=[],k=g.length,r=k-1,j,q;r>=0;--r){j=g[r];q=e.createRange(a.doc);if(j.collapsed)if(j=(a.doc||document).getElementById(j.markerId)){j.style.display="inline";var v=j.previousSibling;v&&v.nodeType==3?(j.parentNode.removeChild(j),q.collapseToPoint(v,v.length)):(q.collapseBefore(j),j.parentNode.removeChild(j))}else b.warn("Marker element has been removed. Cannot restore selection.");else d(a.doc,q,j.startMarkerId,
+!0),d(a.doc,q,j.endMarkerId,!1);k==1&&q.normalizeBoundaries();i[r]=q}k==1&&f&&e.features.selectionHasExtend&&g[0].backwards?(h.removeAllRanges(),h.addRange(i[0],!0)):h.setRanges(i);a.restored=!0}};e.removeMarkerElement=g;e.removeMarkers=function(a){for(var d=a.rangeInfos,b=0,f=d.length,e;b<f;++b)e=d[b],e.collapsed?g(a.doc,e.markerId):(g(a.doc,e.startMarkerId),g(a.doc,e.endMarkerId))}});
+rangy.createModule("Serializer",function(e,b){function a(d,b){var b=b||[],f=d.nodeType,e=d.childNodes,g=e.length,h=[f,d.nodeName,g].join(":"),i="",l="";switch(f){case 3:i=d.nodeValue.replace(/</g,"&lt;").replace(/>/g,"&gt;");break;case 8:i="<\!--"+d.nodeValue.replace(/</g,"&lt;").replace(/>/g,"&gt;")+"--\>";break;default:i="<"+h+">",l="</>"}i&&b.push(i);for(f=0;f<g;++f)a(e[f],b);l&&b.push(l);return b}function d(d){d=a(d).join("");return s(d).toString(16)}function f(a,d,b){for(var f=[],e=a,b=b||o.getDocument(a).documentElement;e&&
+e!=b;)f.push(o.getNodeIndex(e,!0)),e=e.parentNode;return f.join("/")+":"+d}function g(a,d,f){d?f||o.getDocument(d):d=(f||document).documentElement;for(var a=a.split(":"),f=a[0]?a[0].split("/"):[],e=f.length,g;e--;)if(g=parseInt(f[e],10),g<d.childNodes.length)d=d.childNodes[parseInt(f[e],10)];else throw b.createError("deserializePosition failed: node "+o.inspectNode(d)+" has no child with index "+g+", "+e);return new o.DomPosition(d,parseInt(a[1],10))}function h(a,b,g){g=g||e.DomRange.getRangeDocument(a).documentElement;
+if(!o.isAncestorOf(g,a.commonAncestorContainer,!0))throw Error("serializeRange: range is not wholly contained within specified root node");a=f(a.startContainer,a.startOffset,g)+","+f(a.endContainer,a.endOffset,g);b||(a+="{"+d(g)+"}");return a}function i(a,b,f){b?f=f||o.getDocument(b):(f=f||document,b=f.documentElement);var a=/^([^,]+),([^,\{]+)({([^}]+)})?$/.exec(a),h=a[4],i=d(b);if(h&&h!==d(b))throw Error("deserializeRange: checksums of serialized range root node ("+h+") and target root node ("+
+i+") do not match");h=g(a[1],b,f);b=g(a[2],b,f);f=e.createRange(f);f.setStart(h.node,h.offset);f.setEnd(b.node,b.offset);return f}function l(a,b,f){b?f||o.getDocument(b):b=(f||document).documentElement;a=/^([^,]+),([^,]+)({([^}]+)})?$/.exec(a)[3];return!a||a===d(b)}function t(a,d,b){for(var a=a||e.getSelection(),a=a.getAllRanges(),f=[],g=0,i=a.length;g<i;++g)f[g]=h(a[g],d,b);return f.join("|")}function n(a,d,b){d?b=b||o.getWindow(d):(b=b||window,d=b.document.documentElement);for(var a=a.split("|"),
+f=e.getSelection(b),g=[],h=0,l=a.length;h<l;++h)g[h]=i(a[h],d,b.document);f.setRanges(g);return f}e.requireModules(["WrappedSelection","WrappedRange"]);(typeof encodeURIComponent=="undefined"||typeof decodeURIComponent=="undefined")&&b.fail("Global object is missing encodeURIComponent and/or decodeURIComponent method");var s=function(){var a=null;return function(d){for(var b=[],f=0,e=d.length,g;f<e;++f)g=d.charCodeAt(f),g<128?b.push(g):g<2048?b.push(g>>6|192,g&63|128):b.push(g>>12|224,g>>6&63|128,
+g&63|128);d=-1;if(!a){for(var f=[],e=0,h;e<256;++e){h=e;for(g=8;g--;)(h&1)==1?h=h>>>1^3988292384:h>>>=1;f[e]=h>>>0}a=f}f=a;e=0;for(g=b.length;e<g;++e)h=(d^b[e])&255,d=d>>>8^f[h];return(d^-1)>>>0}}(),o=e.dom;e.serializePosition=f;e.deserializePosition=g;e.serializeRange=h;e.deserializeRange=i;e.canDeserializeRange=l;e.serializeSelection=t;e.deserializeSelection=n;e.canDeserializeSelection=function(a,d,b){var f;d?f=b?b.document:o.getDocument(d):d=(b||window).document.documentElement;for(var a=a.split("|"),
+b=0,e=a.length;b<e;++b)if(!l(a[b],d,f))return!1;return!0};e.restoreSelectionFromCookie=function(a){var a=a||window,d;a:{d=a.document.cookie.split(/[;,]/);for(var b=0,f=d.length,e;b<f;++b)if(e=d[b].split("="),e[0].replace(/^\s+/,"")=="rangySerializedSelection"&&(e=e[1])){d=decodeURIComponent(e.replace(/\s+$/,""));break a}d=null}d&&n(d,a.doc)};e.saveSelectionCookie=function(a,d){var a=a||window,d=typeof d=="object"?d:{},b=d.expires?";expires="+d.expires.toUTCString():"",f=d.path?";path="+d.path:"",
+g=d.domain?";domain="+d.domain:"",h=d.secure?";secure":"",i=t(e.getSelection(a));a.document.cookie=encodeURIComponent("rangySerializedSelection")+"="+encodeURIComponent(i)+b+f+g+h};e.getElementChecksum=d});
+(function(){var e,b;e={changeIdAttribute:"data-cid",userIdAttribute:"data-userid",userNameAttribute:"data-username",timeAttribute:"data-time",attrValuePrefix:"",blockEl:"p",stylePrefix:"cts",currentUser:{id:null,name:null},changeTypes:{insertType:{tag:"insert",alias:"ins",action:"Inserted"},deleteType:{tag:"delete",alias:"del",action:"Deleted"}},handleEvents:!1,contentEditable:!0,isTracking:!0,noTrack:".ice-no-track",avoid:".ice-avoid"};b=function(a){a||(a={});if(!a.element)throw Error("`options.element` must be defined for ice construction.");
+ice.dom.extend(!0,this,e,a);this.pluginsManager=new ice.IcePluginManager(this);a.plugins&&this.pluginsManager.usePlugins("ice-init",a.plugins)};b.prototype={_changes:{},_userStyles:{},_styles:{},_uniqueStyleIndex:0,_browserType:null,_batchChangeid:null,_uniqueIDIndex:1,_delBookmark:"tempdel",isPlaceHoldingDeletes:!1,startTracking:function(){this.element.setAttribute("contentEditable",this.contentEditable);if(this.handleEvents){var a=this;ice.dom.bind(a.element,"keyup.ice keydown.ice keypress.ice mousedown.ice mouseup.ice",
+function(d){return a.handleEvent(d)})}this.initializeEnvironment();this.initializeEditor();this.initializeRange();this.pluginsManager.fireEnabled(this.element);return this},stopTracking:function(){this.element.setAttribute("contentEditable",!this.contentEditable);this.handleEvents&&ice.dom.unbind(this.element,"keyup.ice keydown.ice keypress.ice mousedown.ice mouseup.ice");this.pluginsManager.fireDisabled(this.element);return this},initializeEnvironment:function(){this.env||(this.env={});this.env.element=
+this.element;this.env.document=this.element.ownerDocument;this.env.window=this.env.document.defaultView||this.env.document.parentWindow||window;this.env.frame=this.env.window.frameElement;this.env.selection=this.selection=new ice.Selection(this.env);this.env.document.createElement(this.changeTypes.insertType.tag);this.env.document.createElement(this.changeTypes.deleteType.tag)},initializeRange:function(){var a=this.selection.createRange();a.setStart(ice.dom.find(this.element,this.blockEl)[0],0);a.collapse(!0);
+this.selection.addRange(a);this.env.frame?this.env.frame.contentWindow.focus():this.element.focus()},initializeEditor:function(){var a=this,d=this.env.document.createElement("div");this.element.childNodes.length?(ice.dom.each(ice.dom.contents(this.element),function(a,b){ice.dom.isBlockElement(b)&&d.appendChild(b)}),d.innerHTML===""&&d.appendChild(ice.dom.create("<"+this.blockEl+" ><br/></"+this.blockEl+">"))):d.appendChild(ice.dom.create("<"+this.blockEl+" ><br/></"+this.blockEl+">"));this.element.innerHTML=
+d.innerHTML;var b=[],e;for(e in this.changeTypes)b.push(this._getIceNodeClass(e));ice.dom.each(ice.dom.find(this.element,"."+b.join(", .")),function(d,e){for(var g=0,t="",n=e.className.split(" "),d=0;d<n.length;d++){var s=RegExp(a.stylePrefix+"-(\\d+)").exec(n[d]);s&&(g=s[1]);(s=RegExp("("+b.join("|")+")").exec(n[d]))&&(t=a._getChangeTypeFromAlias(s[1]))}n=ice.dom.attr(e,a.userIdAttribute);a.setUserStyle(n,Number(g));g=ice.dom.attr(e,a.changeIdAttribute);a._changes[g]={type:t,userid:n,username:ice.dom.attr(e,
+a.userNameAttribute),time:ice.dom.attr(e,a.timeAttribute)}})},enableChangeTracking:function(){this.isTracking=!0;this.pluginsManager.fireEnabled(this.element)},disableChangeTracking:function(){this.isTracking=!1;this.pluginsManager.fireDisabled(this.element)},setCurrentUser:function(a){this.currentUser=a},handleEvent:function(a){if(this.isTracking)if(a.type=="mouseup"){var d=this;setTimeout(function(){d.mouseUp(a)},200)}else if(a.type=="mousedown")return this.mouseDown(a);else if(a.type=="keypress"){var b=
+this.keyPress(a);b||a.preventDefault();return b}else if(a.type=="keydown")return(b=this.keyDown(a))||a.preventDefault(),b;else a.type=="keyup"&&this.pluginsManager.fireCaretUpdated()},createIceNode:function(a,d){var b=this.env.document.createElement(this.changeTypes[a].tag);ice.dom.addClass(b,this._getIceNodeClass(a));b.appendChild(d?d:this.env.document.createTextNode(""));this.addChange(this.changeTypes[a].alias,[b]);this.pluginsManager.fireNodeCreated(b,{action:this.changeTypes[a].action});return b},
+insert:function(a,d){d?this.selection.addRange(d):d=this.getCurrentRange();typeof a==="string"&&(a=document.createTextNode(a));if(!d.collapsed&&(this.deleteContents(),d=this.getCurrentRange(),d.startContainer===d.endContainer&&this.element===d.startContainer)){ice.dom.empty(this.element);var b=d.getLastSelectableChild(this.element);d.setStartAfter(b);d.collapse(!0)}this._moveRangeToValidTrackingPos(d);b=this.startBatchChange();this._insertNode(a||document.createTextNode("\ufeff"),d,!a);this.pluginsManager.fireNodeInserted(a,
+d);this.endBatchChange(b);return!1},placeholdDeletes:function(){var a=this;this.isPlaceholdingDeletes&&this.revertDeletePlaceholders();this.isPlaceholdingDeletes=!0;this._deletes=[];var d="."+this._getIceNodeClass("deleteType");ice.dom.each(ice.dom.find(this.element,d),function(d,b){a._deletes.push(ice.dom.cloneNode(b));ice.dom.replaceWith(b,"<"+a._delBookmark+' data-allocation="'+(a._deletes.length-1)+'"/>')});return!0},revertDeletePlaceholders:function(){var a=this;if(!this.isPlaceholdingDeletes)return!1;
+ice.dom.each(this._deletes,function(d,b){ice.dom.find(a.element,a._delBookmark+"[data-allocation="+d+"]").replaceWith(b)});this.isPlaceholdingDeletes=!1;return!0},deleteContents:function(a,d){var b=!0;d?this.selection.addRange(d):d=this.getCurrentRange();var e=this.startBatchChange(this.changeTypes.deleteType.alias);d.collapsed===!1?this._deleteFromSelection(d):b=a?this._deleteFromRight(d):this._deleteFromLeft(d);this.selection.addRange(d);this.endBatchChange(e);return b},getChanges:function(){return this._changes},
+getElementContent:function(){return this.element.innerHTML},getCleanContent:function(a,d,b){var e="",h=this;ice.dom.each(this.changeTypes,function(a,d){a!="deleteType"&&(d>0&&(e+=","),e+="."+h._getIceNodeClass(a))});a=a?typeof a==="string"?ice.dom.create("<div>"+a+"</div>"):ice.dom.cloneNode(a)[0]:ice.dom.cloneNode(this.element)[0];a=b?b.call(this,a):a;b=ice.dom.find(a,e);ice.dom.each(b,function(){ice.dom.replaceWith(this,ice.dom.contents(this))});b=ice.dom.find(a,"."+this._getIceNodeClass("deleteType"));
+ice.dom.remove(b);a=d?d.call(this,a):a;return a.innerHTML},acceptAll:function(){this.element.innerHTML=this.getCleanContent()},rejectAll:function(){var a="."+this._getIceNodeClass("insertType"),d="."+this._getIceNodeClass("deleteType");ice.dom.remove(ice.dom.find(this.element,a));ice.dom.each(ice.dom.find(this.element,d),function(a,d){ice.dom.replaceWith(d,ice.dom.contents(d))})},acceptChange:function(a){this.acceptRejectChange(a,!0)},rejectChange:function(a){this.acceptRejectChange(a,!1)},acceptRejectChange:function(a,
+d){var b,e,h,i,l,t,n=ice.dom;if(!a)if(b=this.getCurrentRange(),b.collapsed)a=b.startContainer;else return;b=h="."+this._getIceNodeClass("deleteType");e=i="."+this._getIceNodeClass("insertType");l=n.getNode(a,b+","+e);t=n.find(this.element,"["+this.changeIdAttribute+"="+n.attr(l,this.changeIdAttribute)+"]");d||(h=e,i=b);ice.dom.is(l,i)?n.each(t,function(a,d){n.replaceWith(d,ice.dom.contents(d))}):n.is(l,h)&&n.remove(t)},isInsideChange:function(a){var d="."+this._getIceNodeClass("insertType")+", ."+
+this._getIceNodeClass("deleteType");if(!a)if(range=this.getCurrentRange(),range.collapsed)a=range.startContainer;else return!1;return!!ice.dom.getNode(a,d)},addChangeType:function(a,d,b,e){d={tag:d,alias:b};if(e)d.action=e;this.changeTypes[a]=d},getIceNode:function(a,d){var b="."+this._getIceNodeClass(d);return ice.dom.getNode(a,b)},_moveRangeToValidTrackingPos:function(a){for(var d=!1,b=this._getVoidElement(a.endContainer);b;){try{a.moveEnd(ice.dom.CHARACTER_UNIT,1),a.moveEnd(ice.dom.CHARACTER_UNIT,
+-1)}catch(e){d=!0}if(d||ice.dom.onBlockBoundary(a.endContainer,a.startContainer,this.blockEl)){a.setStartAfter(b);a.collapse(!0);break}(b=this._getVoidElement(a.endContainer))?(a.setEnd(a.endContainer,0),a.moveEnd(ice.dom.CHARACTER_UNIT,ice.dom.getNodeTextContent(a.endContainer).length),a.collapse()):(a.setStart(a.endContainer,0),a.collapse(!0))}},_getNoTrackElement:function(a){var d=this._getNoTrackSelector();return ice.dom.is(a,d)?a:ice.dom.parents(a,d)[0]||null},_getNoTrackSelector:function(){return this.noTrack},
+_getVoidElement:function(a){var d=this._getVoidElSelector();return ice.dom.is(a,d)?a:ice.dom.parents(a,d)[0]||null},_getVoidElSelector:function(){return"."+this._getIceNodeClass("deleteType")+","+this.avoid},_currentUserIceNode:function(a){return ice.dom.attr(a,this.userIdAttribute)==this.currentUser.id},_getChangeTypeFromAlias:function(a){var d,b=null;for(d in this.changeTypes)this.changeTypes.hasOwnProperty(d)&&this.changeTypes[d].alias==a&&(b=d);return b},_getIceNodeClass:function(a){return this.attrValuePrefix+
+this.changeTypes[a].alias},getUserStyle:function(a){var d=null;return d=this._userStyles[a]?this._userStyles[a]:this.setUserStyle(a,this.getNewStyleId())},setUserStyle:function(a,d){var b=this.stylePrefix+"-"+d;this._styles[d]||(this._styles[d]=!0);return this._userStyles[a]=b},getNewStyleId:function(){var a=++this._uniqueStyleIndex;return this._styles[a]?this.getNewStyleId():(this._styles[a]=!0,a)},addChange:function(a,d){var b=this._batchChangeid||this.getNewChangeId();this._changes[b]||(this._changes[b]=
+{type:this._getChangeTypeFromAlias(a),time:(new Date).getTime(),userid:this.currentUser.id,username:this.currentUser.name});var e=this;ice.dom.foreach(d,function(a){e.addNodeToChange(b,d[a])});return b},addNodeToChange:function(a,d){if(this._batchChangeid!==null)a=this._batchChangeid;var b=this.getChange(a);d.getAttribute(this.changeIdAttribute)||d.setAttribute(this.changeIdAttribute,a);d.getAttribute(this.userIdAttribute)||d.setAttribute(this.userIdAttribute,b.userid);d.getAttribute(this.userNameAttribute)||
+d.setAttribute(this.userNameAttribute,b.username);d.getAttribute(this.timeAttribute)||d.setAttribute(this.timeAttribute,b.time);ice.dom.hasClass(d,this._getIceNodeClass(b.type))||ice.dom.addClass(d,this._getIceNodeClass(b.type));b=this.getUserStyle(b.userid);ice.dom.hasClass(d,b)||ice.dom.addClass(d,b)},getChange:function(a){var d=null;this._changes[a]&&(d=this._changes[a]);return d},getNewChangeId:function(){var a=++this._uniqueIDIndex;this._changes[a]&&(a=this.getNewChangeId());return a},startBatchChange:function(){return this._batchChangeid=
+this.getNewChangeId()},endBatchChange:function(a){if(a===this._batchChangeid)this._batchChangeid=null},getCurrentRange:function(){return this.selection.getRangeAt(0)},_insertNode:function(a,d,b){var e=this._currentUserIceNode(this.getIceNode(d.startContainer,"insertType"));if(!b||!e)e||(a=this.createIceNode("insertType",a)),d.insertNode(a),d.setEnd(a,1),d.collapse(),b&&(d.setStart(a,0),d.setEnd(a,1)),this.selection.addRange(d)},_deleteFromSelection:function(a){for(var d=new ice.Bookmark(this.env,
+a),b=ice.dom.getElementsBetween(d.start,d.end),e=ice.dom.parents(a.startContainer,this.blockEl)[0],h=ice.dom.parents(a.endContainer,this.blockEl)[0],i=[],l=b.length,t=0;t<l;t++){var n=b[t];ice.dom.is(n,this.blockEl)&&i.push(n);if(!(n.nodeType===ice.dom.TEXT_NODE&&ice.dom.getNodeTextContent(n)==="")){if(n.hasChildNodes())for(var s=0;s<n.childNodes.length;s++){var o=n.childNodes[s];(this._getNoTrackElement(o)||this._currentUserIceNode(o))&&ice.dom.remove(o)}(this._getNoTrackElement(n)||this._currentUserIceNode(n))&&
+ice.dom.remove(n);if(!this._getVoidElement(n)){if(n.nodeType!==ice.dom.TEXT_NODE)if(ice.dom.remove(ice.dom.find(n,"br")),s=ice.dom.cloneNode(n),ice.dom.remove(ice.dom.find(s,this._getVoidElSelector())),ice.dom.getNodeTextContent(s).length===0)continue;else if(ice.dom.is(n,this.blockEl)){s=this.createIceNode("deleteType");newEl=document.createElement(this.blockEl);s.innerHTML=n.innerHTML;n.innerHTML="";n.appendChild(s);continue}s=this.createIceNode("deleteType");ice.dom.insertBefore(n,s);s.appendChild(n)}}}if(e!==
+h){for(;i.length;)ice.dom.mergeContainers(i.shift(),e);ice.dom.mergeContainers(h,e)}(b=d.start.previousSibling)?(d.selectBookmark(),a=this.getCurrentRange(),a.moveStart(ice.dom.CHARACTER_UNIT,-1),a.moveStart(ice.dom.CHARACTER_UNIT,1)):(b=this.env.document.createTextNode(""),ice.dom.insertBefore(d.start,b),this.selection.addRange(a),d.selectBookmark(),a=this.getCurrentRange(),a.setStart(b,0));a.collapse(!0)},_deleteFromRight:function(a){var d=ice.dom.parents(a.startContainer,this.blockEl)[0]||ice.dom.is(a.startContainer,
+this.blockEl)&&a.startContainer||null,b=d&&d.nextSibling||null,e=ice.dom.is(a.startContainer,this.blockEl)&&ice.dom.getNodeTextContent(a.startContainer)=="";a.moveEnd(ice.dom.CHARACTER_UNIT,1);a.moveEnd(ice.dom.CHARACTER_UNIT,-1);if(!b&&!ice.dom.isChildOf(a.endContainer,this.element))return a.moveEnd(ice.dom.CHARACTER_UNIT,-1),a.moveEnd(ice.dom.CHARACTER_UNIT,1),a.collapse(),!0;if((ice.dom.onBlockBoundary(a.endContainer,a.startContainer,this.blockEl)||e)&&!this._getVoidElement(d))return b!==ice.dom.parents(a.endContainer,
+this.blockEl)[0]&&a.setEnd(b,0),ice.dom.remove(ice.dom.find(a.startContainer,"br")),ice.dom.mergeBlockWithSibling(a,ice.dom.parents(a.startContainer,this.blockEl)[0]||d,!0);if(this._getVoidElement(a.endContainer))return a.setEnd(a.endContainer,0),a.moveEnd(ice.dom.CHARACTER_UNIT,ice.dom.getNodeTextContent(a.endContainer).length||0),a.collapse(),this._deleteFromRight(a);if(this._getNoTrackElement(a.endContainer.parentElement))return a.deleteContents(),!1;a.collapse();d=a.startContainer;if(a.startContainer.data&&
+a.endOffset===d.data.length){b=a.cloneRange();b.moveEnd(ice.dom.CHARACTER_UNIT,1);if(e=ice.dom.getBlockParent(b.endContainer,this.element)){if(ice.dom.isChildOf(e,this.element)===!1)return;var h=ice.dom.getBlockParent(b.startContainer,this.element);if(e!==h){ice.dom.mergeContainers(e,h);a.setStart(b.startContainer,b.startContainer.data.length);a.collapse(!0);return}}d=a.getNextContainer(d);if(ice.dom.isChildOf(d,this.element)===!1)return!1;d=a.getFirstSelectableChild(d);a.setStart(d,0);this._addTextNodeTracking(d,
+a)}else if(d=this.getIceNode(a.startContainer,"insertType"),d===null||!this._currentUserIceNode(d))this._addTextNodeTracking(a.startContainer,a,!0);else if(a.moveEnd(ice.dom.CHARACTER_UNIT,1),a.deleteContents(),d!==null&&ice.dom.isBlank(ice.dom.getNodeTextContent(d))===!0){b=d.previousSibling;if(!b||b.nodeType!==ice.dom.TEXT_NODE)b=this.env.document.createTextNode(""),ice.dom.insertBefore(d,b);a.setStart(b,b.data.length);ice.dom.remove(d)}a.collapse(!0);return!0},_deleteFromLeft:function(a){var d=
+ice.dom.parents(a.startContainer,this.blockEl)[0]||ice.dom.is(a.startContainer,this.blockEl)&&a.startContainer||null,b=d&&d.previousSibling||null,e=ice.dom.is(a.startContainer,this.blockEl)&&ice.dom.getNodeTextContent(a.startContainer)=="";a.moveStart(ice.dom.CHARACTER_UNIT,-1);var h=a.startOffset===a.endOffset&&a.startContainer===a.endContainer,i=!ice.dom.isChildOf(a.startContainer,this.element);if(h||!b&&i)return b&&a.moveStart(ice.dom.CHARACTER_UNIT,1),a.collapse(!0),!0;a.moveStart(ice.dom.CHARACTER_UNIT,
+1);if((ice.dom.onBlockBoundary(a.startContainer,a.endContainer,this.blockEl)||e)&&this._getVoidElement(b))return a.deleteContents(),!1;if(this._getVoidElement(a.startContainer))return a.setStart(a.startContainer,0),a.collapse(!0),this._deleteFromLeft(a);if(ice.dom.onBlockBoundary(a.startContainer,a.endContainer,this.blockEl)||e)return b!==ice.dom.parents(a.startContainer,this.blockEl)[0]&&a.setStart(b,0),ice.dom.remove(ice.dom.find(a.startContainer,"br")),ice.dom.mergeBlockWithSibling(a,ice.dom.parents(a.endContainer,
+this.blockEl)[0]||d);if(this._getNoTrackElement(a.startContainer.parentElement))return a.deleteContents(),!1;d=a.startContainer;if(a.startOffset===0){b=a.cloneRange();b.moveStart(ice.dom.CHARACTER_UNIT,-1);if(e=ice.dom.getBlockParent(b.startContainer,this.element)){if(ice.dom.isChildOf(e,this.element)===!1)return!1;h=ice.dom.getBlockParent(b.endContainer,this.element);if(h!==e){ice.dom.mergeContainers(h,e);a.setStart(b.startContainer,b.startContainer.data.length);a.collapse(!0);return}}d=a.getPreviousContainer(d);
+if(!ice.dom.isChildOf(d,this.element))return!1;ice.dom.isStubElement(d)?(a.moveStart(ice.dom.CHARACTER_UNIT,-1),ice.dom.addClass(d,this._getIceNodeClass("deleteType")),ice.dom.attr(d,"title","Content removed"),a.collapse(!0)):(d=a.getLastSelectableChild(d),a.setStart(d,d.data.length),this._addTextNodeTracking(d,a))}else b=a.startContainer,d=this.getIceNode(b,"insertType"),d===null||!this._currentUserIceNode(d)?this._addTextNodeTracking(b,a):(a.moveStart(ice.dom.CHARACTER_UNIT,-1),a.moveEnd(ice.dom.CHARACTER_UNIT,
+-1),a.moveEnd(ice.dom.CHARACTER_UNIT,1),a.deleteContents(),d!==null&&ice.dom.isBlank(ice.dom.getNodeTextContent(d))&&(b=this.env.document.createTextNode(""),ice.dom.insertBefore(d,b),a.setStart(b,0),a.collapse(!0),ice.dom.replaceWith(d,ice.dom.contents(d))));return!0},_addTextNodeTracking:function(a,d,b){if(!(!b&&d.startOffset===0||this.getIceNode(a,"deleteType")!==null)){var e="",h="",i="";b?(e=a.nodeValue.substring(0,d.endOffset),h=a.nodeValue.substr(d.endOffset,1),i=a.nodeValue.substring(d.endOffset+
+1)):(e=a.nodeValue.substring(0,d.startOffset-1),h=a.nodeValue.substr(d.startOffset-1,1),i=a.nodeValue.substring(d.startOffset));if(d.startOffset===1&&!b||b&&d.startOffset===0){var l=this.getIceNode(a.previousSibling,"deleteType");l!==null&&!this._currentUserIceNode(l)&&(l=null);if(l){if(b)if(l.lastChild&&l.lastChild.nodeType===ice.dom.TEXT_NODE?l.lastChild.nodeValue+=h:(b=this.env.document.createTextNode(h),l.appendChild(b)),a.nodeValue=e+i,a.nodeValue.length===0){b=!1;for(a=a.nextSibling;!b;)(l=
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+keyDown:function(b){b.metaKey!==!0&&b.ctrlKey!==!0||b.keyCode==86&&this.handlePaste()},handleCut:function(){if(this._ice.isTracking){var b=this._ice.getCurrentRange();if(!b.collapsed){var a=b.cloneContents(),d=this;setTimeout(function(){d.doCut(a)},1);return!0}}},doCut:function(b){var a=this._ice.getCurrentRange(),d,e;this._tmpNode=this._ice.env.document.createElement("span");a.insertNode(this._tmpNode);a.setStartAfter(this._tmpNode);for(a.collapse(!0);d=b.firstChild;)a.insertNode(d),a.setStartAfter(d),
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+e.IcePlugin);this.ice._plugin.IceSmartQuotesPlugin=b}).call(this);
+(function(){var e=function(b){this._ice=b};e.prototype={keyDown:function(b){if(ice.dom.isBrowser("mozilla")){var a=parseInt(ice.dom.browser().version);if(a>14&&b.keyCode===173||a<=14&&b.keyCode===109)return this.convertEmdash(b)}else if(b.keyCode===189)return this.convertEmdash(b);return!0},convertEmdash:function(){var b=this._ice.getCurrentRange();if(b.collapsed){try{b.moveStart(ice.dom.CHARACTER_UNIT,-1);var a=ice.dom.getParents(b.startContainer,this._ice.blockEl)[0],d=ice.dom.getParents(b.endContainer,
+this._ice.blockEl)[0];if(a===d&&!this._ice.getIceNode(b.startContainer,"deleteType")&&(c=b.toHtml(),c==="-")){b.extractContents();b.collapse();var e=this._ice.env.document.createTextNode("\u2014");this._ice.isTracking?this._ice._insertNode(e,b):(b.insertNode(e),b.setStart(e,1),b.collapse(!0));this._ice._preventKeyPress=!0;return!1}}catch(g){}b.collapse()}return!0}};ice.dom.noInclusionInherits(e,ice.IcePlugin);this._plugin.IceEmdashPlugin=e}).call(this.ice);
diff --git a/common/lib/xmodule/xmodule/js/src/peergrading/peer_grading_problem.coffee b/common/lib/xmodule/xmodule/js/src/peergrading/peer_grading_problem.coffee
index 4151bda33d..2adc35aa92 100644
--- a/common/lib/xmodule/xmodule/js/src/peergrading/peer_grading_problem.coffee
+++ b/common/lib/xmodule/xmodule/js/src/peergrading/peer_grading_problem.coffee
@@ -283,6 +283,9 @@ class @PeerGradingProblem
     @error_container.hide()
     @flag_submission_confirmation.hide()
 
+    if @tracking_changes()
+      @change_tracker = new TrackChanges(@el)
+
     @is_calibrated_check()
 
   # locally scoped jquery.
@@ -306,13 +309,18 @@ class @PeerGradingProblem
 
 
   construct_data: () ->
+    if @tracking_changes()
+      feedback_content = @feedback_area.html()
+    else
+      feedback_content = @feedback_area.val()
+    
     data =
       rubric_scores: @rub.get_score_list()
       score: @rub.get_total_score()
       location: @location
       submission_id: @essay_id_input.val()
       submission_key: @submission_key_input.val()
-      feedback: @feedback_area.val()
+      feedback: feedback_content
       submission_flagged: @flag_student_checkbox.is(':checked')
       answer_unknown: @answer_unknown_checkbox.is(':checked')
     return data
@@ -388,7 +396,7 @@ class @PeerGradingProblem
       @grading_message.fadeIn()
       message = "<p>Successfully saved your feedback. Fetching the next essay."
       if response.required_done
-        message = message + " You have completed the required number of gradings."
+        message = message + " You have done the required number of peer evals but may continue grading if you like."
       message = message + "</p>"
       @grading_message.html(message)
     else
@@ -464,6 +472,9 @@ class @PeerGradingProblem
     else
       @render_error("An error occurred while retrieving the next calibration essay")
 
+  tracking_changes: () =>
+    return @grading_wrapper.data('track-changes') == true
+
   # Renders a student submission to be graded
   render_submission: (response) =>
     if response.success
@@ -483,8 +494,12 @@ class @PeerGradingProblem
       @grading_panel.find(@grading_text_sel).show()
       @flag_student_container.show()
       @answer_unknown_container.show()
-      @feedback_area.val("")
-
+      if @tracking_changes()
+        @feedback_area.html(@make_paragraphs(response.student_response))
+        @change_tracker.rebindTracker()
+      else
+        @feedback_area.val("")
+      @answer_unknown_checkbox.removeAttr("checked")
       @flag_student_checkbox.removeAttr("checked")
       @submit_button.show()
       @submit_button.unbind('click')
@@ -496,7 +511,6 @@ class @PeerGradingProblem
     else
       @render_error("An error occured when retrieving the next submission.")
 
-
   make_paragraphs: (text) ->
     paragraph_split = text.split(/\n\s*\n/)
     new_text = ''
@@ -527,13 +541,13 @@ class @PeerGradingProblem
     # display correct grade
     @calibration_feedback_panel.slideDown()
     calibration_wrapper = @$(@calibration_feedback_wrapper_sel)
-    calibration_wrapper.html("<p>The score you gave was: #{@grade}. The actual score is: #{response.actual_score}</p>")
+    calibration_wrapper.html("<p>The score you gave was: #{@grade}. The instructor score is: #{response.actual_score}</p>")
 
     score = parseInt(@grade)
     actual_score = parseInt(response.actual_score)
 
     if score == actual_score
-      calibration_wrapper.append("<p>Your score matches the actual score!</p>")
+      calibration_wrapper.append("<p>Your score matches the instructor score!</p>")
     else
       calibration_wrapper.append("<p>You may want to review the rubric again.</p>")
 
diff --git a/common/lib/xmodule/xmodule/js/src/peergrading/track_changes.coffee b/common/lib/xmodule/xmodule/js/src/peergrading/track_changes.coffee
new file mode 100644
index 0000000000..3885505ed9
--- /dev/null
+++ b/common/lib/xmodule/xmodule/js/src/peergrading/track_changes.coffee
@@ -0,0 +1,47 @@
+class @TrackChanges
+  reset_button_sel: '.reset-changes'
+  tracked_feedback_sel: '.feedback-area.track-changes'
+  submit_button_sel: '.submit-button'
+  tracker: null
+
+  constructor: (element) ->
+    @el = element
+    @reset_button = @$(@reset_button_sel)
+    @submit_button = @$(@submit_button_sel)
+    @tracked_feedback = @$(@tracked_feedback_sel)
+    @reset_button.click @reset_changes
+    @submit_button.click @stop_tracking_on_submit
+
+
+  rebindTracker: () =>
+    if @tracker?
+      @tracker.stopTracking()
+      delete @tracker
+    @tracker = new ice.InlineChangeEditor({
+      element: @tracked_feedback[0], #return DOM element from selector
+      handleEvents: true,
+      currentUser: { id: 1, name: 'Peer Feedback' }, #hardcoded current user
+      # optional plugins
+      plugins: [
+        # Track content that is cut and pasted
+        {
+          name: 'IceCopyPastePlugin',
+          settings: {
+            # List of tags and attributes to preserve when cleaning a paste
+            preserve: 'p,a[href],span[id,class],em,strong'
+          }
+        }
+      ]
+    })
+    @tracker.startTracking()
+
+  # locally scoped jquery. (scoped to the element)
+  $: (selector) ->
+    $(selector, @el)
+
+  reset_changes: (event) =>
+    event.preventDefault()
+    @tracker.rejectAll()
+
+  stop_tracking_on_submit: () =>
+    @tracker.stopTracking()
diff --git a/common/lib/xmodule/xmodule/peer_grading_module.py b/common/lib/xmodule/xmodule/peer_grading_module.py
index b890270f5b..31743ae53b 100644
--- a/common/lib/xmodule/xmodule/peer_grading_module.py
+++ b/common/lib/xmodule/xmodule/peer_grading_module.py
@@ -86,9 +86,13 @@ class PeerGradingModule(PeerGradingFields, XModule):
     _VERSION = 1
 
     js = {
+        'js': [
+            resource_string(__name__, 'js/src/peergrading/ice.min.js'),
+        ],
         'coffee': [
             resource_string(__name__, 'js/src/peergrading/peer_grading.coffee'),
             resource_string(__name__, 'js/src/peergrading/peer_grading_problem.coffee'),
+            resource_string(__name__, 'js/src/peergrading/track_changes.coffee'),
             resource_string(__name__, 'js/src/collapsible.coffee'),
             resource_string(__name__, 'js/src/javascript_loader.coffee'),
         ]
@@ -495,6 +499,21 @@ class PeerGradingModule(PeerGradingFields, XModule):
         })
         return html
 
+    def _find_corresponding_module_for_location(self, location):
+        """
+        Find the peer grading module that exists at the given location.
+        """
+        try:
+            return self.descriptor.system.load_item(location)
+        except ItemNotFoundError:
+            # The linked problem doesn't exist.
+            log.error("Problem {0} does not exist in this course.".format(location))
+            raise
+        except NoPathToItem:
+            # The linked problem does not have a path to it (ie is in a draft or other strange state).
+            log.error("Cannot find a path to problem {0} in this course.".format(location))
+            raise
+
     def peer_grading(self, _data=None):
         '''
         Show a peer grading interface
@@ -528,27 +547,11 @@ class PeerGradingModule(PeerGradingFields, XModule):
             log.exception("Could not contact peer grading service.")
             success = False
 
-
-        def _find_corresponding_module_for_location(location):
-            """
-            Find the peer grading module that exists at the given location.
-            """
-            try:
-                return self.descriptor.system.load_item(location)
-            except ItemNotFoundError:
-                # The linked problem doesn't exist.
-                log.error("Problem {0} does not exist in this course.".format(location))
-                raise
-            except NoPathToItem:
-                # The linked problem does not have a path to it (ie is in a draft or other strange state).
-                log.error("Cannot find a path to problem {0} in this course.".format(location))
-                raise
-
         good_problem_list = []
         for problem in problem_list:
             problem_location = problem['location']
             try:
-                descriptor = _find_corresponding_module_for_location(problem_location)
+                descriptor = self._find_corresponding_module_for_location(problem_location)
             except (NoPathToItem, ItemNotFoundError):
                 continue
             if descriptor:
@@ -599,6 +602,8 @@ class PeerGradingModule(PeerGradingFields, XModule):
         elif data.get('location') is not None:
             problem_location = data.get('location')
 
+        module = self._find_corresponding_module_for_location(problem_location)
+
         ajax_url = self.ajax_url
         html = self.system.render_template('peer_grading/peer_grading_problem.html', {
             'view_html': '',
@@ -607,6 +612,7 @@ class PeerGradingModule(PeerGradingFields, XModule):
             'ajax_url': ajax_url,
             # Checked above
             'staff_access': False,
+            'track_changes': getattr(module, 'track_changes', False),
             'use_single_location': self.use_for_single_location,
         })
 
diff --git a/common/lib/xmodule/xmodule/tests/test_peer_grading.py b/common/lib/xmodule/xmodule/tests/test_peer_grading.py
index 0197e36cf5..60de073f47 100644
--- a/common/lib/xmodule/xmodule/tests/test_peer_grading.py
+++ b/common/lib/xmodule/xmodule/tests/test_peer_grading.py
@@ -3,11 +3,11 @@ from xmodule.modulestore import Location
 from .import get_test_system
 from test_util_open_ended import MockQueryDict, DummyModulestore
 from xmodule.open_ended_grading_classes.peer_grading_service import MockPeerGradingService
-import json
 from mock import Mock
 from xmodule.peer_grading_module import PeerGradingModule
 from xblock.field_data import DictFieldData
 from xblock.fields import ScopeIds
+from xmodule.modulestore.exceptions import ItemNotFoundError
 
 import logging
 
@@ -24,7 +24,9 @@ class PeerGradingModuleTest(unittest.TestCase, DummyModulestore):
     """
     problem_location = Location(["i4x", "edX", "open_ended", "peergrading",
                                  "PeerGradingSample"])
+    coe_location = Location(["i4x", "edX", "open_ended", "combinedopenended", "SampleQuestion"])
     calibrated_dict = {'location': "blah"}
+    coe_dict = {'location': coe_location.url()}
     save_dict = MockQueryDict()
     save_dict.update({
         'location': "blah",
@@ -46,6 +48,7 @@ class PeerGradingModuleTest(unittest.TestCase, DummyModulestore):
         self.test_system.open_ended_grading_interface = None
         self.setup_modulestore(COURSE)
         self.peer_grading = self.get_module_from_location(self.problem_location, COURSE)
+        self.coe = self.get_module_from_location(self.coe_location, COURSE)
 
     def test_module_closed(self):
         """
@@ -132,9 +135,18 @@ class PeerGradingModuleTest(unittest.TestCase, DummyModulestore):
         See if we can render a single problem
         @return:
         """
-        response = self.peer_grading.peer_grading_problem(self.calibrated_dict)
+        response = self.peer_grading.peer_grading_problem(self.coe_dict)
         self.assertEqual(response['success'], True)
 
+    def test___find_corresponding_module_for_location_exceptions(self):
+        """
+        Unit test for the exception cases of __find_corresponding_module_for_location
+        Mainly for diff coverage
+        @return:
+        """
+        with self.assertRaises(ItemNotFoundError):
+            self.peer_grading._find_corresponding_module_for_location(Location('i4x','a','b','c','d'))
+
     def test_get_instance_state(self):
         """
         Get the instance state dict
@@ -235,3 +247,35 @@ class PeerGradingModuleLinkedTest(unittest.TestCase, DummyModulestore):
 
         # Ensure that it is properly setup.
         self.assertTrue(peer_grading.use_for_single_location)
+
+
+class PeerGradingModuleTrackChangesTest(unittest.TestCase, DummyModulestore):
+    """
+    Test peer grading with the track changes modification
+    """
+    class MockedTrackChangesProblem(object):
+        track_changes = True
+
+    mock_track_changes_problem = Mock(side_effect=[MockedTrackChangesProblem()])
+    pgm_location = Location(["i4x", "edX", "open_ended", "peergrading", "PeerGradingSample"])
+
+    def setUp(self):
+        """
+        Create a peer grading module from a test system
+        @return:
+        """
+        self.test_system = get_test_system()
+        self.test_system.open_ended_grading_interface = None
+        self.setup_modulestore(COURSE)
+        self.peer_grading = self.get_module_from_location(self.pgm_location, COURSE)
+
+    def test_tracking_peer_eval_problem(self):
+        """
+        Tests rendering of peer eval problem with track changes set.  With the test_system render_template
+        this test becomes a bit tautological, but oh well.
+        @return:
+        """
+        self.peer_grading._find_corresponding_module_for_location = self.mock_track_changes_problem
+        response = self.peer_grading.peer_grading_problem({'location': 'mocked'})
+        self.assertEqual(response['success'], True)
+        self.assertIn("'track_changes': True", response['html'])
diff --git a/lms/static/sass/course/_staff_grading.scss b/lms/static/sass/course/_staff_grading.scss
index 1087aae67a..ba0069a3d2 100644
--- a/lms/static/sass/course/_staff_grading.scss
+++ b/lms/static/sass/course/_staff_grading.scss
@@ -6,6 +6,32 @@ div.peer-grading{
         margin: 0;
         height: 75px;
     }
+    
+    div.feedback-area.track-changes {
+        position: relative;
+        margin: 0px;
+        height: 150px;
+        border: 1px solid lightgray;
+        padding: 5px;
+        resize: vertical;
+        width: 99%;
+        overflow: auto;
+    }
+
+    div.feedback-area.track-changes, p.legend {
+        .ice-controls {
+            float: right;
+        }
+        .del {
+            position: relative;
+            text-decoration: line-through;
+            background-color: #ffc3c3;
+        }
+        .ins {
+            position: relative;
+            background-color: #c3ffc3;
+        }
+    }
 
     ul.rubric-list{
         margin: 0;
diff --git a/lms/templates/peer_grading/peer_grading_problem.html b/lms/templates/peer_grading/peer_grading_problem.html
index 80b230e2aa..3d8588e73d 100644
--- a/lms/templates/peer_grading/peer_grading_problem.html
+++ b/lms/templates/peer_grading/peer_grading_problem.html
@@ -26,7 +26,7 @@
                     </section>
                 </div>
             </div>
-            <section class="grading-wrapper">
+            <section class="grading-wrapper" data-track-changes="${'true' if track_changes else 'false'}">
                 <div class="grading-message">
                 </div>
                 <h2>${_("Student Response")}</h2>
@@ -42,9 +42,21 @@
                         <p class="rubric-selection-container"></p>
                         <p class="score-selection-container"></p>
                         <h3>${_("Written Feedback")}</h3>
-                        <p>${_("Please include some written feedback as well.")}</p>
-                        <textarea name="feedback" placeholder="Feedback for student" class="feedback-area" cols="70" ></textarea>
-                        <div class="flag-student-container"> ${_("This submission has explicit or pornographic content : ")}
+                        % if track_changes:
+                            <p>${_("Please edit your peer's submission below.")}</p>
+                            <p class="legend">
+                                <span class="ins">${_("This is an insertion.")}</span>&nbsp;
+                                <span class="del">${_("This is a deletion.")}</span>&nbsp;
+                                <span class="ice-controls">
+                                    <a href="#" class="reset-changes"><i class="icon-refresh"></i> Reset Changes</a>
+                                </span>
+                            </p>
+                            <div name="feedback" class="feedback-area track-changes" contenteditable="true"></div>
+                        % else:
+                            <p>${_("Please include some written feedback as well.")}</p>
+                            <textarea name="feedback" placeholder="Feedback for student" class="feedback-area" cols="70" ></textarea>
+                        % endif
+                        <div class="flag-student-container"> ${_("This submission has explicit or offensive content : ")}
                             <input type="checkbox" class="flag-checkbox" value="student_is_flagged"> 
                         </div>
                         <div class="answer-unknown-container"> ${_("I do not know how to grade this question : ")}