Upgrade the codebase up to PHP 8.1 syntax using Rector

Makefile

@@ -22,6 +22,7 @@ PHP_CS_FIXER_URL="https://github.com/FriendsOfPHP/PHP-CS-Fixer/releases/download
 PHP_CS_FIXER_CACHE=.php_cs.cache
 
 PHPSTAN=./vendor/bin/phpstan
+RECTOR=./vendor/bin/rector
 
 PSALM=./.tools/psalm
 PSALM_URL="https://github.com/vimeo/psalm/releases/download/v4.15.0/psalm.phar"
@@ -96,6 +97,14 @@ psalm-baseline: vendor
 psalm: vendor $(PSALM)
 	$(PSALM) --threads=max
 
+.PHONY: rector
+rector: vendor $(RECTOR)
+	$(RECTOR) process
+
+.PHONY: rector-check
+rector-check: vendor $(RECTOR)
+	$(RECTOR) process --dry-run
+
 .PHONY: validate
 validate:
 	composer validate --strict
@@ -119,7 +128,7 @@ profile: vendor $(BENCHMARK_SOURCES)
 
 .PHONY: autoreview
 autoreview: 	 	## Runs various checks (static analysis & AutoReview test suite)
-autoreview: phpstan psalm validate test-autoreview
+autoreview: phpstan psalm validate test-autoreview rector-check
 
 .PHONY: test
 test:		 	## Runs all the tests

composer.json

@@ -77,14 +77,15 @@
         "brianium/paratest": "^6.3",
         "fidry/makefile": "^0.2.0",
         "helmich/phpunit-json-assert": "^3.0",
-        "phpspec/prophecy-phpunit": "^2.0",
         "phpspec/prophecy": "^1.15",
+        "phpspec/prophecy-phpunit": "^2.0",
         "phpstan/extension-installer": "^1.1.0",
         "phpstan/phpstan": "^1.10.15",
         "phpstan/phpstan-phpunit": "^1.0.0",
         "phpstan/phpstan-strict-rules": "^1.1.0",
         "phpstan/phpstan-webmozart-assert": "^1.0.2",
         "phpunit/phpunit": "^9.5.5",
+        "rector/rector": "^0.16.0",
         "symfony/phpunit-bridge": "^5.4 || ^6.0",
         "symfony/yaml": "^5.4 || ^6.0",
         "thecodingmachine/phpstan-safe-rule": "^1.2.0"

rector.php

@@ -0,0 +1,58 @@
+<?php
+/**
+ * This code is licensed under the BSD 3-Clause License.
+ *
+ * Copyright (c) 2017, Maks Rafalko
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ *   list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ *
+ * * Neither the name of the copyright holder nor the names of its
+ *   contributors may be used to endorse or promote products derived from
+ *   this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+declare(strict_types=1);
+
+use Rector\Config\RectorConfig;
+use Rector\Php81\Rector\Property\ReadOnlyPropertyRector;
+use Rector\Set\ValueObject\LevelSetList;
+
+return static function (RectorConfig $rectorConfig): void {
+    $rectorConfig->paths([
+        __DIR__ . '/src',
+        // TODO uncomment as a separate PR
+        // __DIR__ . '/tests/phpunit',
+    ]);
+
+    // define sets of rules
+    $rectorConfig->sets([
+        LevelSetList::UP_TO_PHP_81,
+    ]);
+
+    $rectorConfig->skip([
+        ReadOnlyPropertyRector::class => [
+            // property can't be readonly as it's returned by reference and may be updated
+            __DIR__ . '/src/TestFramework/Coverage/TestLocations.php',
+        ],
+    ]);
+};

src/Command/ConfigureCommand.php

@@ -64,7 +64,7 @@
 use function Safe\json_encode;
 use function Safe\sprintf;
 use stdClass;
-use function strpos;
+use function str_starts_with;
 use Symfony\Component\Console\Input\InputOption;
 
 /**
@@ -228,7 +228,7 @@ private function saveConfig(
         );
     }
 
-    private function abort(): void
+    private function abort(): never
     {
         throw new RuntimeException('Configuration generation aborted');
     }
@@ -244,10 +244,10 @@ private function getJsonSchemaPathOrUrl(): string
         try {
             $version = InstalledVersions::getPrettyVersion(Application::PACKAGE_NAME);
 
-            if ($version === null || strpos($version, 'dev-') === 0) {
+            if ($version === null || str_starts_with($version, 'dev-')) {
                 $version = 'master';
             }
-        } catch (OutOfBoundsException $e) {
+        } catch (OutOfBoundsException) {
             $version = 'master';
         }
 

src/Command/RunCommand.php

@@ -569,7 +569,7 @@ private function runConfigurationCommand(Locator $locator, IO $io): void
     {
         try {
             $locator->locateOneOf(SchemaConfigurationLoader::POSSIBLE_DEFAULT_CONFIG_FILES);
-        } catch (FileNotFound|FileOrDirectoryNotFound $exception) {
+        } catch (FileNotFound|FileOrDirectoryNotFound) {
             $configureCommand = $this->getApplication()->find('configure');
 
             $args = [

src/Config/ConsoleHelper.php

@@ -44,11 +44,8 @@
  */
 class ConsoleHelper
 {
-    private FormatterHelper $formatterHelper;
-
-    public function __construct(FormatterHelper $formatterHelper)
+    public function __construct(private readonly FormatterHelper $formatterHelper)
     {
-        $this->formatterHelper = $formatterHelper;
     }
 
     public function writeSection(OutputInterface $output, string $text, string $style = 'bg=blue;fg=white'): void

src/Config/Guesser/PhpUnitPathGuesser.php

@@ -36,7 +36,7 @@
 namespace Infection\Config\Guesser;
 
 use stdClass;
-use function strpos;
+use function str_contains;
 use function trim;
 
 /**
@@ -46,11 +46,8 @@ final class PhpUnitPathGuesser
 {
     private const CURRENT_DIR_PATH = '.';
 
-    private stdClass $composerJsonContent;
-
-    public function __construct(stdClass $composerJsonContent)
+    public function __construct(private readonly stdClass $composerJsonContent)
     {
-        $this->composerJsonContent = $composerJsonContent;
     }
 
     public function guess(): string
@@ -79,7 +76,7 @@ private function getPhpUnitDir(array $parsedPaths): string
     {
         foreach ($parsedPaths as $namespace => $parsedPath) {
             // for old Symfony projects (<=2.7) phpunit.xml is located in ./app folder
-            if (strpos($namespace, 'SymfonyStandard') !== false && trim($parsedPath, '/') === 'app') {
+            if (str_contains($namespace, 'SymfonyStandard') && trim($parsedPath, '/') === 'app') {
                 return 'app';
             }
         }

src/Config/Guesser/SourceDirGuesser.php

@@ -49,11 +49,8 @@
  */
 class SourceDirGuesser
 {
-    private stdClass $composerJsonContent;
-
-    public function __construct(stdClass $composerJsonContent)
+    public function __construct(private readonly stdClass $composerJsonContent)
     {
-        $this->composerJsonContent = $composerJsonContent;
     }
 
     /**
@@ -117,7 +114,7 @@ private function parsePsrSection(array $autoloadDirs): array
      * @param string[]|string $path
      * @param string[] $dirs
      */
-    private function parsePath($path, array &$dirs): void
+    private function parsePath(array|string $path, array &$dirs): void
     {
         if (is_array($path)) {
             array_walk_recursive(

src/Config/ValueProvider/ExcludeDirsProvider.php

@@ -47,8 +47,8 @@
 use Infection\FileSystem\Locator\Locator;
 use Infection\FileSystem\Locator\RootsFileOrDirectoryLocator;
 use function Safe\glob;
+use function str_contains;
 use function str_replace;
-use function strpos;
 use Symfony\Component\Console\Helper\QuestionHelper;
 use Symfony\Component\Console\Question\Question;
 use Symfony\Component\Filesystem\Filesystem;
@@ -60,15 +60,11 @@
 {
     public const EXCLUDED_ROOT_DIRS = ['vendor', 'tests', 'test'];
 
-    private ConsoleHelper $consoleHelper;
-    private QuestionHelper $questionHelper;
-    private Filesystem $filesystem;
-
-    public function __construct(ConsoleHelper $consoleHelper, QuestionHelper $questionHelper, Filesystem $filesystem)
-    {
-        $this->consoleHelper = $consoleHelper;
-        $this->questionHelper = $questionHelper;
-        $this->filesystem = $filesystem;
+    public function __construct(
+        private readonly ConsoleHelper $consoleHelper,
+        private readonly QuestionHelper $questionHelper,
+        private readonly Filesystem $filesystem
+    ) {
     }
 
     /**
@@ -108,9 +104,7 @@
             $globDirs = glob($sourceDirs[0] . '/*', GLOB_ONLYDIR);
 
             $autocompleteValues = array_map(
-                static function (string $dir) use ($sourceDirs): string {
-                    return str_replace($sourceDirs[0] . '/', '', $dir);
-                },
+                static fn (string $dir): string => str_replace($sourceDirs[0] . '/', '', $dir),
                 $globDirs
             );
         }
@@ -132,7 +126,7 @@
     private function getValidator(Locator $locator): Closure
     {
         return static function ($answer) use ($locator) {
-            if (!$answer || strpos($answer, '*') !== false) {
+            if (!$answer || str_contains($answer, '*')) {
                 return $answer;
             }
 

src/Config/ValueProvider/PCOVDirectoryProvider.php

@@ -46,13 +46,13 @@
  */
 class PCOVDirectoryProvider
 {
-    private ?string $phpConfiguredPcovDirectory;
+    private ?string $phpConfiguredPcovDirectory = null;
 
     public function __construct(?string $iniValue = null)
     {
         try {
             $this->phpConfiguredPcovDirectory = $iniValue ?? ini_get('pcov.directory');
-        } catch (InfoException $e) {
+        } catch (InfoException) {
             // Probably not using PCOV
             $this->phpConfiguredPcovDirectory = null;
         }

src/Config/ValueProvider/PhpUnitCustomExecutablePathProvider.php

@@ -55,22 +55,18 @@
  */
 final class PhpUnitCustomExecutablePathProvider
 {
-    private TestFrameworkFinder $phpUnitExecutableFinder;
-    private ConsoleHelper $consoleHelper;
-    private QuestionHelper $questionHelper;
-
-    public function __construct(TestFrameworkFinder $phpUnitExecutableFinder, ConsoleHelper $consoleHelper, QuestionHelper $questionHelper)
-    {
-        $this->phpUnitExecutableFinder = $phpUnitExecutableFinder;
-        $this->consoleHelper = $consoleHelper;
-        $this->questionHelper = $questionHelper;
+    public function __construct(
+        private readonly TestFrameworkFinder $phpUnitExecutableFinder,
+        private readonly ConsoleHelper $consoleHelper,
+        private readonly QuestionHelper $questionHelper
+    ) {
     }
 
     public function get(IO $io): ?string
     {
         try {
             $this->phpUnitExecutableFinder->find(TestFrameworkTypes::PHPUNIT);
-        } catch (FinderException $e) {
+        } catch (FinderException) {
             $io->writeln(['']);
 
             $questionText = $this->consoleHelper->getQuestion(
@@ -80,10 +76,10 @@
             $question = new Question($questionText);
             $question->setValidator($this->getValidator());
 
             return str_replace(
                 DIRECTORY_SEPARATOR,
                 '/',
-                $this->questionHelper->ask($io->getInput(), $io->getOutput(), $question)
+                (string) $this->questionHelper->ask($io->getInput(), $io->getOutput(), $question)
             );
         }