From d7671a0d58824bcc421e89e8b4323f92fe00e6df Mon Sep 17 00:00:00 2001
From: Jesse Hallett <jesse@galois.com>
Date: Thu, 19 Dec 2013 14:51:58 -0800
Subject: Wikipedia guideline: checks for floating content on both sides of
 screen

---
 guidelines/wikipedia/floatSandwiches.js | 29 +++++++++++++++++++++++++++++
 guidelines/wikipedia/wikipedia.json     |  1 +
 2 files changed, 30 insertions(+)
 create mode 100644 guidelines/wikipedia/floatSandwiches.js

diff --git a/guidelines/wikipedia/floatSandwiches.js b/guidelines/wikipedia/floatSandwiches.js
new file mode 100644
index 0000000..ecdcdba
--- /dev/null
+++ b/guidelines/wikipedia/floatSandwiches.js
@@ -0,0 +1,29 @@
+exports.name = "Floating content on both sides of screen";
+exports.description = "Be careful not to add images or other floating content on both sides of the screen simultaneously.";
+
+exports.rule = function(report) {
+  var $topElems = $5('#mw-content-text > *');
+  var left      = floating($topElems, 'left').toArray().map($);
+  var right     = floating($topElems, 'right').toArray().map($);
+
+  left.forEach(function($l) {
+    var ltop    = $l.offset().top;
+    var lbottom = ltop + $l.outerHeight();
+
+    if (right.some(function($r) {
+      var rtop    = $r.offset().top;
+      var rbottom = rtop + $r.outerHeight();
+
+      return (rtop > ltop && rtop < lbottom) ||
+        (rbottom > ltop && rbottom < lbottom);
+    })) {
+      report.warning('Left and right floating elements overlap vertically.', $l.get(0));
+    }
+  });
+};
+
+function floating($elems, leftOrRight) {
+  return $elems.filter(function() {
+    return $(this).css('float') === leftOrRight;
+  });
+}
diff --git a/guidelines/wikipedia/wikipedia.json b/guidelines/wikipedia/wikipedia.json
index 67adf30..a2b24bc 100644
--- a/guidelines/wikipedia/wikipedia.json
+++ b/guidelines/wikipedia/wikipedia.json
@@ -11,5 +11,6 @@
   , "imageSize.js"
   , "horizontalRule.js"
   , "pseudoHeadings.js"
+  , "floatSandwiches.js"
   ]
 }
-- 
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