Added SimplifyDeMorganBinaryRector rule

app/code/core/Mage/Adminhtml/Block/Catalog/Product/Edit/Tab/Price/Group/Abstract.php

@@ -309,7 +309,7 @@ public function isScopeGlobal()
      */
     public function isShowWebsiteColumn()
     {
-        return !($this->isScopeGlobal() || Mage::app()->isSingleStoreMode());
+        return !$this->isScopeGlobal() && !Mage::app()->isSingleStoreMode();
     }
 
     /**
@@ -319,6 +319,6 @@ public function isShowWebsiteColumn()
      */
     public function isAllowChangeWebsite()
     {
-        return !(!$this->isShowWebsiteColumn() || $this->getProduct()->getStoreId());
+        return $this->isShowWebsiteColumn() && !$this->getProduct()->getStoreId();
     }
 }

app/code/core/Mage/Adminhtml/Block/Sales/Items/Abstract.php

@@ -582,6 +582,6 @@ public function canShipPartiallyItem($order = null)
 
     public function isShipmentRegular()
     {
-        return !(!$this->canShipPartiallyItem() || !$this->canShipPartially());
+        return $this->canShipPartiallyItem() && $this->canShipPartially();
     }
 }

app/code/core/Mage/Adminhtml/Block/System/Variable/Edit/Form.php

@@ -66,10 +66,7 @@ protected function _prepareForm()
 
         $useDefault = false;
         if ($this->getVariable()->getId() && $this->getVariable()->getStoreId()) {
-            $useDefault = !(
-                (bool)$this->getVariable()->getStoreHtmlValue()
-                || (bool)$this->getVariable()->getStorePlainValue()
-            );
+            $useDefault = !(bool)$this->getVariable()->getStoreHtmlValue() && !(bool)$this->getVariable()->getStorePlainValue();
             $this->getVariable()->setUseDefaultValue((int)$useDefault);
             $fieldset->addField('use_default_value', 'select', [
                 'name'   => 'use_default_value',

app/code/core/Mage/Adminhtml/Controller/Action.php

@@ -395,8 +395,7 @@ protected function _validateSecretKey()
         if (is_array($this->_publicActions) && in_array($this->getRequest()->getActionName(), $this->_publicActions)) {
             return true;
         }
-        return !(!($secretKey = $this->getRequest()->getParam(Mage_Adminhtml_Model_Url::SECRET_KEY_PARAM_NAME, null))
-            || !hash_equals(Mage::getSingleton('adminhtml/url')->getSecretKey(), $secretKey));
+        return ($secretKey = $this->getRequest()->getParam(Mage_Adminhtml_Model_Url::SECRET_KEY_PARAM_NAME, null)) && hash_equals(Mage::getSingleton('adminhtml/url')->getSecretKey(), $secretKey);
     }
 
     /**

app/code/core/Mage/Adminhtml/Model/System/Config/Backend/Sitemap.php

@@ -24,7 +24,7 @@ protected function _beforeSave()
         $value = $this->getValue();
         if ($value < 0 || $value > 1) {
             throw new Exception(Mage::helper('sitemap')->__('The priority must be between 0 and 1.'));
-        } elseif (($value == 0) && !($value === '0' || $value === '0.0')) {
+        } elseif (($value == 0) && ($value !== '0' && $value !== '0.0')) {
             throw new Exception(Mage::helper('sitemap')->__('The priority must be between 0 and 1.'));
         }
         return $this;

app/code/core/Mage/Bundle/Block/Catalog/Product/View/Type/Bundle.php

@@ -89,7 +89,7 @@ public function getOptions()
     public function hasOptions()
     {
         $this->getOptions();
-        return !(empty($this->_options) || !$this->getProduct()->isSalable());
+        return !empty($this->_options) && $this->getProduct()->isSalable();
     }
 
     /**

app/code/core/Mage/Catalog/Model/Api/Resource.php

@@ -63,8 +63,7 @@ protected function _isAllowedAttribute($attribute, $attributes = null)
         }
 
         if (is_array($attributes)
-            && !(in_array($attribute->getAttributeCode(), $attributes)
-                  || in_array($attribute->getAttributeId(), $attributes))
+            && (!in_array($attribute->getAttributeCode(), $attributes) && !in_array($attribute->getAttributeId(), $attributes))
         ) {
             return false;
         }

app/code/core/Mage/Catalog/Model/Api2/Product/Rest/Admin/V1.php

@@ -383,8 +383,7 @@ protected function _isAllowedAttribute($attribute, $attributes = null)
     {
         $isAllowed = true;
         if (is_array($attributes)
-            && !(in_array($attribute->getAttributeCode(), $attributes)
-            || in_array($attribute->getAttributeId(), $attributes))
+            && (!in_array($attribute->getAttributeCode(), $attributes) && !in_array($attribute->getAttributeId(), $attributes))
         ) {
             $isAllowed = false;
         }

app/code/core/Mage/Checkout/Block/Onepage/Billing.php

@@ -57,8 +57,7 @@ protected function _construct()
      */
     public function isUseBillingAddressForShipping()
     {
-        return !(($this->getQuote()->getIsVirtual())
-            || !$this->getQuote()->getShippingAddress()->getSameAsBilling());
+        return !$this->getQuote()->getIsVirtual() && $this->getQuote()->getShippingAddress()->getSameAsBilling();
     }
 
     /**

app/code/core/Mage/Checkout/Model/Api/Resource.php

@@ -105,7 +105,7 @@ protected function _getQuote($quoteId, $store = null)
         /** @var Mage_Sales_Model_Quote $quote */
         $quote = Mage::getModel("sales/quote");
 
-        if (!(is_string($store) || is_int($store))) {
+        if (!is_string($store) && !is_int($store)) {
             $quote->loadByIdWithoutStore($quoteId);
         } else {
             $storeId = $this->_getStoreId($store);

app/code/core/Mage/Checkout/Model/Cart/Payment/Api.php

@@ -41,7 +41,7 @@ protected function _preparePaymentData($data)
      */
     protected function _canUsePaymentMethod($method, $quote)
     {
-        if (!($method->isGateway() || $method->canUseInternal())) {
+        if (!$method->isGateway() && !$method->canUseInternal()) {
             return false;
         }
 
@@ -59,7 +59,7 @@ protected function _canUsePaymentMethod($method, $quote)
         $total = $quote->getBaseGrandTotal();
         $minTotal = $method->getConfigData('min_order_total');
         $maxTotal = $method->getConfigData('max_order_total');
-        return !((!empty($minTotal) && ($total < $minTotal)) || (!empty($maxTotal) && ($total > $maxTotal)));
+        return !(!empty($minTotal) && ($total < $minTotal)) && !(!empty($maxTotal) && ($total > $maxTotal));
     }
 
     /**

app/code/core/Mage/Checkout/Model/Type/Onepage.php

@@ -120,7 +120,7 @@ public function initCheckout()
         $customerSession = $this->getCustomerSession();
         if (is_array($checkout->getStepData())) {
             foreach ($checkout->getStepData() as $step => $data) {
-                if (!($step === 'login' || $customerSession->isLoggedIn() && $step === 'billing')) {
+                if ($step !== 'login' && !($customerSession->isLoggedIn() && $step === 'billing')) {
                     $checkout->setStepData($step, 'allow', false);
                 }
             }

app/code/core/Mage/Core/Helper/Abstract.php

@@ -154,7 +154,7 @@ public function isModuleEnabled($moduleName = null)
         }
 
         $isActive = Mage::getConfig()->getNode('modules/' . $moduleName . '/active');
-        return !(!$isActive || !in_array((string)$isActive, ['true', '1']));
+        return $isActive && in_array((string)$isActive, ['true', '1']);
     }
 
     /**

app/code/core/Mage/Core/Helper/Data.php

@@ -455,8 +455,8 @@ public function getCacheBetaTypes()
      */
     public function copyFieldset($fieldset, $aspect, $source, $target, $root = 'global')
     {
-        if (!(is_array($source) || $source instanceof Varien_Object)
-            || !(is_array($target) || $target instanceof Varien_Object)
+        if (!is_array($source) && !$source instanceof Varien_Object
+            || !is_array($target) && !$target instanceof Varien_Object
         ) {
             return false;
         }
@@ -525,7 +525,7 @@ public function copyFieldset($fieldset, $aspect, $source, $target, $root = 'glob
     public function decorateArray($array, $prefix = 'decorated_', $forceSetAll = false)
     {
         // check if array or an object to be iterated given
-        if (!(is_array($array) || is_object($array))) {
+        if (!is_array($array) && !is_object($array)) {
             return $array;
         }
 

app/code/core/Mage/Core/Helper/String.php

@@ -350,7 +350,7 @@ public function parseQueryStr($str)
      */
     protected function _validateQueryStr($str)
     {
-        return !(!$str || !str_contains($str, '='));
+        return $str && str_contains($str, '=');
     }
 
     /**

app/code/core/Mage/Customer/Model/Api/Resource.php

@@ -45,8 +45,7 @@ class Mage_Customer_Model_Api_Resource extends Mage_Api_Model_Resource_Abstract
     protected function _isAllowedAttribute($attribute, ?array $filter = null)
     {
         if (!is_null($filter)
-            && !(in_array($attribute->getAttributeCode(), $filter)
-                  || in_array($attribute->getAttributeId(), $filter))
+            && (!in_array($attribute->getAttributeCode(), $filter) && !in_array($attribute->getAttributeId(), $filter))
         ) {
             return false;
         }

app/code/core/Mage/Eav/Model/Entity/Abstract.php

@@ -660,7 +660,7 @@ public function walkAttributes($partMethod, array $args = [])
      */
     protected function _isCallableAttributeInstance($instance, $method, $args)
     {
-        return !(!is_object($instance) || !method_exists($instance, $method));
+        return is_object($instance) && method_exists($instance, $method);
     }
 
     /**

app/code/core/Mage/Paypal/Model/Express/Checkout.php

@@ -755,8 +755,7 @@ protected function _setBillingAgreementRequest()
         $isRequested = $this->_isBARequested || $this->_quote->getPayment()
             ->getAdditionalInformation(self::PAYMENT_INFO_TRANSPORT_BILLING_AGREEMENT);
 
-        if (!($this->_config->allow_ba_signup == Mage_Paypal_Model_Config::EC_BA_SIGNUP_AUTO
-            || $isRequested && $this->_config->shouldAskToCreateBillingAgreement())
+        if ($this->_config->allow_ba_signup != Mage_Paypal_Model_Config::EC_BA_SIGNUP_AUTO && !($isRequested && $this->_config->shouldAskToCreateBillingAgreement())
         ) {
             return $this;
         }

app/code/core/Mage/Sales/Model/Order.php

@@ -677,7 +677,7 @@ public function canVoidPayment()
      */
     protected function _canVoidOrder()
     {
-        return !($this->canUnhold() || $this->isPaymentReview());
+        return !$this->canUnhold() && !$this->isPaymentReview();
     }
 
     /**

app/code/core/Mage/Sales/Model/Order/Payment/Transaction.php

@@ -357,7 +357,7 @@ public function canVoidAuthorizationCompletely()
     {
         try {
             $authTransaction = $this->closeAuthorization('', true);
-            return !($authTransaction->hasChildTransaction() || $this->_children);
+            return !$authTransaction->hasChildTransaction() && !$this->_children;
         } catch (Mage_Core_Exception $e) {
             // jam all logical exceptions, fallback to false
         }

lib/Varien/File/Uploader.php

@@ -546,7 +546,7 @@ private function _createDestinationFolder($destinationFolder)
             $destinationFolder = substr($destinationFolder, 0, -1);
         }
 
-        if (!(@is_dir($destinationFolder) || @mkdir($destinationFolder, 0777, true))) {
+        if (!@is_dir($destinationFolder) && !@mkdir($destinationFolder, 0777, true)) {
             throw new Exception("Unable to create directory '{$destinationFolder}'.");
         }
         return $this;

rector.php

@@ -2,6 +2,7 @@
 
 declare(strict_types=1);
 
+use Rector\CodeQuality\Rector\BooleanNot\SimplifyDeMorganBinaryRector;
 use Rector\CodeQuality\Rector\If_\SimplifyIfReturnBoolRector;
 use Rector\Config\RectorConfig;
 
@@ -16,5 +17,6 @@
     ])
     ->withSkipPath(__DIR__ . '/vendor')
     ->withRules([
+        SimplifyDeMorganBinaryRector::class,
         SimplifyIfReturnBoolRector::class
     ]);