requireParenthesesAroundIIFE: use utils methods for IIFE detection

Author: mikesherov

lib/rules/require-parentheses-around-iife.js

@@ -34,6 +34,7 @@
  */
 
 var assert = require('assert');
+var utils = require('../utils');
 
 module.exports = function() {};
 
@@ -66,23 +67,9 @@ module.exports.prototype = {
         }
 
         file.iterateNodesByType('CallExpression', function(node) {
-            var callee = node.callee;
-            var outer = node;
-            var inner;
+            var inner = utils.getFunctionNodeFromIIFE(node);
 
-            if (callee.type === 'MemberExpression' &&
-                callee.object.type === 'FunctionExpression' &&
-                callee.property.type === 'Identifier' &&
-                (callee.property.name === 'call' || callee.property.name === 'apply')
-            ) {
-                inner = callee.object;
-            } else if (callee.type === 'FunctionExpression') {
-                inner = callee;
-            } else {
-                return;
-            }
-
-            if (!isWrapped(inner) && !isWrapped(outer)) {
+            if (inner && !isWrapped(inner) && !isWrapped(node)) {
                 errors.add(
                     'Wrap immediately invoked function expressions in parentheses',
                     node.loc.start.line,