/**
   * @fileoverview Rule to flag comparisons to the value NaN
   * @author James Allardice
   * @copyright 2014 Jordan Harband. All rights reserved.
   * @copyright 2013 James Allardice. All rights reserved.
   */
  
  "use strict";
  
  //------------------------------------------------------------------------------
  // Rule Definition
  //------------------------------------------------------------------------------
  
  module.exports = function(context) {
  
      return {
          "BinaryExpression": function(node) {
              if (/^(?:[<>]|[!=]=)=?$/.test(node.operator) && (node.left.name === "NaN" || node.right.name === "NaN")) {
                  context.report(node, "Use the isNaN function to compare with NaN.");
              }
          }
      };
  
  };
  
  module.exports.schema = [];