Truncated markup can be displayed in forums user profile view

FOR-581

common/static/coffee/spec/discussion/view/discussion_thread_profile_view_spec.coffee

+# -*- coding: utf-8 -*-
+describe "DiscussionThreadProfileView", ->
+
+    beforeEach ->
+
+        setFixtures """
+        <article class="discussion-thread" id="thread_1"></article>
+        <script type='text/template' id='_profile_thread'>
+          <article class="discussion-article" data-id="{{id}}">
+            <div class="discussion-post local">
+              <div class="post-body">{{{abbreviatedBody}}}</div>
+            </div>
+          </article>
+        </script>
+        """
+        @threadData = {
+            id: "1",
+            body: "dummy body",
+            discussion: new Discussion()
+            abuse_flaggers: [],
+            votes: {up_count: "42"}
+        }
+        @imageTag = '<img src="https://www.google.com.pk/images/srpr/logo11w.png">'
+        window.MathJax = { Hub: { Queue: -> } }
+
+    makeView = (thread) ->
+      view = new DiscussionThreadProfileView(el: $("article#thread_#{thread.id}"), model: thread)
+      spyConvertMath(view)
+      return view
+
+    makeThread = (threadData) ->
+      thread = new Thread(threadData)
+      thread.discussion = new Discussion()
+      return thread
+
+    spyConvertMath = (view) ->
+      spyOn(view, "convertMath").andCallFake( ->
+          @model.set('markdownBody', @model.get('body'))
+        )
+
+    checkPostWithImages = (numberOfImages, truncatedText, threadData, imageTag) ->
+      expectedHtml = '<p>'
+      threadData.body = '<p>'
+      testText = ''
+      expectedText = ''
+
+      if truncatedText
+        testText = new Array(100).join('test ')
+        expectedText = testText.substring(0, 139)+ '…'
+      else
+        testText = 'Test body'
+        expectedText = 'Test body'
+
+        for i in [0..numberOfImages-1]
+          threadData.body = threadData.body + imageTag
+          if i == 0
+            expectedHtml = expectedHtml + imageTag
+          else
+            expectedHtml = expectedHtml + '<em>image omitted</em>'
+
+      threadData.body = threadData.body + '<em>' + testText + '</em></p>'
+      if numberOfImages > 1
+        expectedHtml = expectedHtml + '<em>' + expectedText + '</em></p><p><em>Some images in this post have been omitted</em></p>'
+      else
+        expectedHtml = expectedHtml + '<em>' + expectedText + '</em></p>'
+
+      view = makeView(makeThread(threadData))
+      view.render()
+      expect(view.$el.find(".post-body").html()).toEqual(expectedHtml)
+
+    checkBody = (truncated, view, threadData) ->
+      view.render()
+      if not truncated
+        expect(view.model.get("body")).toEqual(view.model.get("abbreviatedBody"))
+        expect(view.$el.find(".post-body").html()).toEqual(threadData.body)
+      else
+        expect(view.model.get("body")).not.toEqual(view.model.get("abbreviatedBody"))
+        expect(view.$el.find(".post-body").html()).not.toEqual(threadData.body)
+        outputHtmlStripped = view.$el.find(".post-body").html().replace(/(<([^>]+)>)/ig,"");
+        outputHtmlStripped = outputHtmlStripped.replace("Some images in this post have been omitted","")
+        outputHtmlStripped = outputHtmlStripped.replace("image omitted","")
+        inputHtmlStripped = threadData.body.replace(/(<([^>]+)>)/ig,"");
+        expectedOutput = inputHtmlStripped.substring(0, 139)+ '…'
+        expect(outputHtmlStripped).toEqual(expectedOutput)
+        expect(view.$el.find(".post-body").html().indexOf("…")).toBeGreaterThan(0)
+
+    describe "Body markdown should be correct", ->
+
+      it "untruncated text without markdown body", ->
+        @threadData.body = "Test body"
+        view = makeView(makeThread(@threadData))
+        checkBody(false, view, @threadData)
+
+      it "truncated text without markdown body", ->
+        @threadData.body = new Array(100).join("test ")
+        view = makeView(makeThread(@threadData))
+        checkBody(true, view, @threadData)
+
+      it "untruncated text with markdown body", ->
+        @threadData.body = '<p>' + @imageTag + '<em>Google top search engine</em></p>'
+        view = makeView(makeThread(@threadData))
+        checkBody(false, view, @threadData)
+
+      it "truncated text with markdown body", ->
+        testText = new Array(100).join("test ")
+        @threadData.body = '<p>' + @imageTag + @imageTag + '<em>' + testText + '</em></p>'
+        view = makeView(makeThread(@threadData))
+        checkBody(true, view, @threadData)
+
+      for numImages in [1, 2, 10]
+        for truncatedText in [true, false]
+          it "body with #{numImages} images and #{if truncatedText then "truncated" else "untruncated"} text", ->
+            checkPostWithImages(numImages, truncatedText, @threadData, @imageTag)

common/static/coffee/src/discussion/utils.coffee

@@ -309,6 +309,16 @@ class @DiscussionUtil
         minLength++
       return text.substr(0, minLength) + gettext('…')
 
+  @abbreviateHTML: (html, minLength) ->
+    # Abbreviates the html to at least minLength characters, stopping at word boundaries
+    truncated_text = jQuery.truncate(html, {length: minLength, noBreaks: true, ellipsis: gettext('…')})
+    $result = $("<div>" + truncated_text + "</div>")
+    imagesToReplace = $result.find("img:not(:first)")
+    if imagesToReplace.length > 0
+        $result.append("<p><em>Some images in this post have been omitted</em></p>")
+    imagesToReplace.replaceWith("<em>image omitted</em>")
+    $result.html()
+
   @getPaginationParams: (curPage, numPages, pageUrlFunc) =>
     delta = 2
     minPage = Math.max(curPage - delta, 1)

common/static/coffee/src/discussion/views/discussion_thread_profile_view.coffee

@@ -2,21 +2,20 @@ if Backbone?
   class @DiscussionThreadProfileView extends Backbone.View
     render: ->
       @template = DiscussionUtil.getTemplate("_profile_thread")
-      if not @model.has('abbreviatedBody')
-        @abbreviateBody()
+      @convertMath()
+      @abbreviateBody()
       params = $.extend(@model.toJSON(),{permalink: @model.urlFor('retrieve')})
       if not @model.get('anonymous')
         params = $.extend(params, user:{username: @model.username, user_url: @model.user_url})
       @$el.html(Mustache.render(@template, params))
       @$("span.timeago").timeago()
-      @convertMath()
+      element = @$(".post-body")
+      MathJax.Hub.Queue ["Typeset", MathJax.Hub, element[0]]
       @
 
     convertMath: ->
-      element = @$(".post-body")
-      element.html DiscussionUtil.postMathJaxProcessor DiscussionUtil.markdownWithHighlight element.text()
-      MathJax.Hub.Queue ["Typeset", MathJax.Hub, element[0]]
+      @model.set('markdownBody', DiscussionUtil.postMathJaxProcessor DiscussionUtil.markdownWithHighlight @model.get('body'))
 
     abbreviateBody: ->
-      abbreviated = DiscussionUtil.abbreviateString @model.get('body'), 140
+      abbreviated = DiscussionUtil.abbreviateHTML @model.get('markdownBody'), 140
       @model.set('abbreviatedBody', abbreviated)

common/static/js/vendor/jquery.truncate.js

+/**
+Copyright (c) 2010-2012 Pathable
+
+Permission is hereby granted, free of charge, to any person
+obtaining a copy of this software and associated documentation
+files (the "Software"), to deal in the Software without
+restriction, including without limitation the rights to use,
+copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+https://github.com/pathable/truncate
+**/
+(function($) {
+
+  // Matches trailing non-space characters.
+  var chop = /(\s*\S+|\s)$/;
+
+  // Return a truncated html string.  Delegates to $.fn.truncate.
+  $.truncate = function(html, options) {
+    return $('<div></div>').append(html).truncate(options).html();
+  };
+
+  // Truncate the contents of an element in place.
+  $.fn.truncate = function(options) {
+    if ($.isNumeric(options)) options = {length: options};
+    var o = $.extend({}, $.truncate.defaults, options);
+
+    return this.each(function() {
+      var self = $(this);
+
+      if (o.noBreaks) self.find('br').replaceWith(' ');
+
+      var text = self.text();
+      var excess = text.length - o.length;
+
+      if (o.stripTags) self.text(text);
+
+      // Chop off any partial words if appropriate.
+      if (o.words && excess > 0) {
+        excess = text.length - text.slice(0, o.length).replace(chop, '').length - 1;
+      }
+
+      if (excess < 0 || !excess && !o.truncated) return;
+
+      // Iterate over each child node in reverse, removing excess text.
+      $.each(self.contents().get().reverse(), function(i, el) {
+        var $el = $(el);
+        var text = $el.text();
+        var length = text.length;
+
+        // If the text is longer than the excess, remove the node and continue.
+        if (length <= excess) {
+          o.truncated = true;
+          excess -= length;
+          $el.remove();
+          return;
+        }
+
+        // Remove the excess text and append the ellipsis.
+        if (el.nodeType === 3) {
+          $(el.splitText(length - excess - 1)).replaceWith(o.ellipsis);
+          return false;
+        }
+
+        // Recursively truncate child nodes.
+        $el.truncate($.extend(o, {length: length - excess}));
+        return false;
+      });
+    });
+  };
+
+  $.truncate.defaults = {
+
+    // Strip all html elements, leaving only plain text.
+    stripTags: false,
+
+    // Only truncate at word boundaries.
+    words: false,
+
+    // Replace instances of <br> with a single space.
+    noBreaks: false,
+
+    // The maximum length of the truncated html.
+    length: Infinity,
+
+    // The character to use as the ellipsis.  The word joiner (U+2060) can be
+    // used to prevent a hanging ellipsis, but displays incorrectly in Chrome
+    // on Windows 7.
+    // http://code.google.com/p/chromium/issues/detail?id=68323
+    ellipsis: '\u2026' // '\u2060\u2026'
+
+  };
+
+})(jQuery);

common/static/js_test.yml

@@ -31,6 +31,7 @@ lib_paths:
     - js/vendor/jquery.min.js
     - js/vendor/jasmine-jquery.js
     - js/vendor/jasmine-imagediff.js
+    - js/vendor/jquery.truncate.js
     - js/vendor/mustache.js
     - js/vendor/underscore-min.js
     - js/vendor/backbone-min.js

lms/templates/discussion/_js_head_dependencies.html

 <%namespace name='static' file='../static_content.html'/>
 
 <script type="text/javascript" src="${static.url('js/split.js')}"></script>
+<script type="text/javascript" src="${static.url('js/vendor/jquery.truncate.js')}"></script>
 <script type="text/javascript" src="${static.url('js/jquery.ajaxfileupload.js')}"></script>
 <script type="text/javascript" src="${static.url('js/Markdown.Converter.js')}"></script>
 <script type="text/javascript" src="${static.url('js/Markdown.Sanitizer.js')}"></script>

lms/templates/discussion/mustache/_profile_thread.mustache

@@ -18,7 +18,7 @@
                 </span>
             </p>
         </header>
-        <div class="post-body">{{abbreviatedBody}}</div>
+        <div class="post-body">{{{abbreviatedBody}}}</div>
     </div>
     <div class="local post-tools">
         <a href="{{permalink}}">${_("View discussion")}</a>