commit 7f3127603af65f79bde6d5ce7f1587dd300c0ac4
Author: Joel Pittet <joel@pittet.ca>
Date:   Sat Jun 28 21:19:15 2014 -0700

    less preprocess

diff --git a/core/lib/Drupal/Core/Template/TwigExtension.php b/core/lib/Drupal/Core/Template/TwigExtension.php
index 4cb31ca..7b372f7 100644
--- a/core/lib/Drupal/Core/Template/TwigExtension.php
+++ b/core/lib/Drupal/Core/Template/TwigExtension.php
@@ -50,6 +50,9 @@ public function getFilters() {
 
       // Array filters.
       new \Twig_SimpleFilter('without', 'twig_without'),
+
+      // CSS class and ID filters.
+      new \Twig_SimpleFilter('class', 'drupal_html_class'),
     );
   }
 
diff --git a/core/modules/node/node.module b/core/modules/node/node.module
index bc454b4..b7870bf 100644
--- a/core/modules/node/node.module
+++ b/core/modules/node/node.module
@@ -667,25 +667,6 @@ function template_preprocess_node(&$variables) {
 
   // Add article ARIA role.
   $variables['attributes']['role'] = 'article';
-
-  // Gather node classes.
-  $variables['attributes']['class'][] = '';
-
-  $variables['node_type'] = drupal_html_class($node->bundle());
-  $variables['view_mode'] = drupal_html_class($variables['view_mode']);
-
-  if ($node->isPromoted()) {
-    $variables['node_promoted'] = TRUE;
-  }
-  if ($node->isSticky()) {
-    $variables['node_sticky'] = TRUE;
-  }
-  if (!$node->isPublished()) {
-    $variables['node_unpublished'] = TRUE;
-  }
-  if (isset($variables['preview'])) {
-    $variables['node_preview'] = TRUE;
-  }
 }
 
 /**
diff --git a/core/modules/node/templates/node.html.twig b/core/modules/node/templates/node.html.twig
index c002230..4294859 100644
--- a/core/modules/node/templates/node.html.twig
+++ b/core/modules/node/templates/node.html.twig
@@ -79,16 +79,15 @@
 #}
 {% set classes = [
   'node',
-  'node--type-' ~ node_type,
-  node_promoted ? 'node--promoted',
-  node_sticky ? 'node--sticky',
-  node_unpublished ? 'node--unpublished',
-  node_preview ? 'node--preview',
-  'node--view-mode-' ~ view_mode
+  'node--type-' ~ node.bundle|class,
+  node.promoted ? 'node--promoted',
+  node.sticky ? 'node--sticky',
+  not node.published ? 'node--unpublished',
+  preview ? 'node--preview',
+  'node--view-mode-' ~ view_mode|class
 ]
 %}
-
-<article class="{{ attributes.class.add(classes) }}" {{ attributes|without('class') }}>
+<article class="{{ attributes.class.add(classes) }}"{{ attributes|without('class') }}>
 
   {{ title_prefix }}
   {% if not page %}
diff --git a/core/modules/system/src/Tests/Theme/TwigFilterTest.php b/core/modules/system/src/Tests/Theme/TwigFilterTest.php
index 9b514d7..c132f94 100644
--- a/core/modules/system/src/Tests/Theme/TwigFilterTest.php
+++ b/core/modules/system/src/Tests/Theme/TwigFilterTest.php
@@ -120,6 +120,10 @@ public function testTwigWithoutFilter() {
         'expected' => '<div><span id="quotes" checked class="red green blue">All attributes again.</span></div>',
         'message' => 'All attributes printed again.',
       ),
+      array(
+        'expected' => '<div id="quotes"><span class="gray-like-a-bunny bem__ized--top-feature" id="quotes--2">ID and class.</span></div>',
+        'message' => 'Class and ID filtered.',
+      ),
     );
 
     foreach ($elements as $element) {
diff --git a/core/modules/system/tests/modules/twig_theme_test/templates/twig_theme_test.filter.html.twig b/core/modules/system/tests/modules/twig_theme_test/templates/twig_theme_test.filter.html.twig
index 28e5c15..a0979dd 100644
--- a/core/modules/system/tests/modules/twig_theme_test/templates/twig_theme_test.filter.html.twig
+++ b/core/modules/system/tests/modules/twig_theme_test/templates/twig_theme_test.filter.html.twig
@@ -20,3 +20,4 @@
 <div><span data-id="{{ attributes.id }}"{{ attributes|without('id') }}>Without string attribute.</span></div>
 <div><span{{ attributes|without('id', 'class') }}>Without either nor class attributes.</span></div>
 <div><span{{ attributes }}>All attributes again.</span></div>
+<div id="{{ attributes.id }}"><span class="{{ 'Gray like a bunny!'|class }} {{ 'BEM__ized--Top Feature'|class }}" id="{{ attributes.id }}">ID and class.</span></div>