1 files changed, 46 insertions, 0 deletions
diff --git a/tools/eslint/lib/rules/no-trailing-spaces.js b/tools/eslint/lib/rules/no-trailing-spaces.js
new file mode 100644
index 0000000000..d299eb5151
--- /dev/null
+++ b/tools/eslint/lib/rules/no-trailing-spaces.js
@@ -0,0 +1,46 @@
+/**
+ * @fileoverview Disallow trailing spaces at the end of lines.
+ * @author Nodeca Team <https://github.com/nodeca>
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = function(context) {
+
+    var TRAILER = "[ \t\u00a0\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u200b\u2028\u2029\u3000]+$";
+
+    //--------------------------------------------------------------------------
+    // Public
+    //--------------------------------------------------------------------------
+
+    return {
+
+        "Program": function checkTrailingSpaces(node) {
+
+            // Let's hack. Since Esprima does not return whitespace nodes,
+            // fetch the source code and do black magic via regexps.
+
+            var src = context.getSource(),
+                re = new RegExp(TRAILER, "mg"),
+                match, lines, location;
+
+            while ((match = re.exec(src)) !== null) {
+                lines = src.slice(0, re.lastIndex).split(/\r?\n/g);
+
+                location = {
+                    line: lines.length,
+                    column: lines[lines.length - 1].length - match[0].length + 1
+                };
+
+                // Passing node is a bit dirty, because message data will contain
+                // big text in `source`. But... who cares :) ?
+                // One more kludge will not make worse the bloody wizardry of this plugin.
+                context.report(node, location, "Trailing spaces not allowed.");
+            }
+        }
+
+    };
+};