Require Null Safe Object operator

Author: simPod

lib/Doctrine/ruleset.xml

@@ -266,6 +266,8 @@
     <rule ref="SlevomatCodingStandard.ControlStructures.RequireNullCoalesceEqualOperator"/>
     <!-- Require usage of null coalesce operator when possible -->
     <rule ref="SlevomatCodingStandard.ControlStructures.RequireNullCoalesceOperator"/>
+    <!-- Require usage of null safe operator when possible -->
+    <rule ref="SlevomatCodingStandard.ControlStructures.RequireNullSafeObjectOperator"/>
     <!-- Forbid usage of conditions when a simple return can be used -->
     <rule ref="SlevomatCodingStandard.ControlStructures.UselessIfConditionWithReturn"/>
     <!-- Forbid usage of boolean-only ternary operator usage (e.g. $foo ? true : false) -->

tests/fixed/null_safe_operator.php

@@ -0,0 +1,5 @@
+<?php
+
+declare(strict_types=1);
+
+$var = $object === null ? null : $object->property;

tests/input/null_safe_operator.php

@@ -0,0 +1,5 @@
+<?php
+
+declare(strict_types=1);
+
+$var = $object === null ? null : $object->property;

tests/php80-compatibility.patch

@@ -1,8 +1,8 @@
 diff --git a/tests/expected_report.txt b/tests/expected_report.txt
-index c644926..1b5b271 100644
+index c644926..d0f0a44 100644
 --- a/tests/expected_report.txt
 +++ b/tests/expected_report.txt
-@@ -15,17 +15,17 @@ tests/input/ControlStructures.php                     28      0
+@@ -15,18 +15,19 @@ tests/input/ControlStructures.php                     28      0
  tests/input/doc-comment-spacing.php                   11      0
  tests/input/duplicate-assignment-variable.php         1       0
  tests/input/EarlyReturn.php                           6       0
@@ -22,9 +22,11 @@ index c644926..1b5b271 100644
 -tests/input/null_coalesce_equal_operator.php          1       0
 +tests/input/null_coalesce_equal_operator.php          5       0
  tests/input/null_coalesce_operator.php                3       0
++tests/input/null_safe_operator.php                    1       0
  tests/input/optimized-functions.php                   1       0
  tests/input/PropertyTypeHintSpacing.php               6       0
-@@ -39,15 +39,15 @@ tests/input/superfluous-naming.php                    11      0
+ tests/input/return_type_on_closures.php               21      0
+@@ -39,15 +40,15 @@ tests/input/superfluous-naming.php                    11      0
  tests/input/test-case.php                             8       0
  tests/input/trailing_comma_on_array.php               1       0
  tests/input/traits-uses.php                           11      0
@@ -36,10 +38,10 @@ index c644926..1b5b271 100644
  tests/input/UselessConditions.php                     20      0
  ----------------------------------------------------------------------
 -A TOTAL OF 377 ERRORS AND 0 WARNINGS WERE FOUND IN 41 FILES
-+A TOTAL OF 390 ERRORS AND 0 WARNINGS WERE FOUND IN 41 FILES
++A TOTAL OF 391 ERRORS AND 0 WARNINGS WERE FOUND IN 42 FILES
  ----------------------------------------------------------------------
 -PHPCBF CAN FIX 313 OF THESE SNIFF VIOLATIONS AUTOMATICALLY
-+PHPCBF CAN FIX 326 OF THESE SNIFF VIOLATIONS AUTOMATICALLY
++PHPCBF CAN FIX 327 OF THESE SNIFF VIOLATIONS AUTOMATICALLY
  ----------------------------------------------------------------------
 
 
@@ -138,6 +140,16 @@ index 8846dd1..51c361c 100644
 
  $bar = $bar['baz'] ?? 'baz';
 
+diff --git a/tests/fixed/null_safe_operator.php b/tests/fixed/null_safe_operator.php
+index 5bbb636..7ce8a3d 100644
+--- a/tests/fixed/null_safe_operator.php
++++ b/tests/fixed/null_safe_operator.php
+@@ -2,4 +2,4 @@
+ 
+ declare(strict_types=1);
+ 
+-$var = $object === null ? null : $object->property;
++$var = $object?->property;
 diff --git a/tests/fixed/type-hints.php b/tests/fixed/type-hints.php
 index 0e952fc..9824fb0 100644
 --- a/tests/fixed/type-hints.php