Start experimenting with PHP7.4 transpiling via rector

composer.json

@@ -17,6 +17,7 @@
 		"ext-json": "*",
 		"phpunit/phpunit": "^9.5.0",
 		"phpstan/phpstan": "^0.12.19",
+	  	"rector/rector": "^0.10.9",
 		"spatie/phpunit-snapshot-assertions": "^4.2.0"
     },
 	"scripts": {
@@ -27,6 +28,6 @@
 	},
 	"require": {
 		"ext-ffi": "*",
-	  	"php": ">= 8.0.0"
+	  	"php": ">= 7.4.0"
 	}
 }

rector.php

@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+use Rector\Core\Configuration\Option;
+use Rector\DowngradePhp80\Rector\Catch_\DowngradeNonCapturingCatchesRector;
+use Rector\DowngradePhp80\Rector\Class_\DowngradePropertyPromotionRector;
+use Rector\DowngradePhp80\Rector\ClassConstFetch\DowngradeClassOnObjectToGetClassRector;
+use Rector\DowngradePhp80\Rector\ClassMethod\DowngradeStaticTypeDeclarationRector;
+use Rector\DowngradePhp80\Rector\ClassMethod\DowngradeTrailingCommasInParamUseRector;
+use Rector\DowngradePhp80\Rector\Expression\DowngradeMatchToSwitchRector;
+use Rector\DowngradePhp80\Rector\FunctionLike\DowngradeMixedTypeDeclarationRector;
+use Rector\DowngradePhp80\Rector\FunctionLike\DowngradeUnionTypeDeclarationRector;
+use Rector\DowngradePhp80\Rector\NullsafeMethodCall\DowngradeNullsafeToTernaryOperatorRector;
+use Rector\DowngradePhp80\Rector\Property\DowngradeUnionTypeTypedPropertyRector;
+use Rector\Generics\Rector\Class_\GenericsPHPStormMethodAnnotationRector;
+use Rector\Set\ValueObject\SetList;
+use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;
+
+return static function (ContainerConfigurator $containerConfigurator): void {
+    // get parameters
+//    $parameters = $containerConfigurator->parameters();
+//
+//    // Define what rule sets will be applied
+//    $parameters->set(Option::SETS, [
+//        SetList::DEAD_CODE,
+//		SetList::PHP_80,
+//    ]);
+
+    // get services (needed for register a single rule)
+    $services = $containerConfigurator->services();
+
+
+    $rules = [
+    	// PHP8 downgrade
+		DowngradeClassOnObjectToGetClassRector::class,
+		DowngradeMatchToSwitchRector::class,
+		DowngradeMixedTypeDeclarationRector::class,
+		DowngradeNonCapturingCatchesRector::class,
+		DowngradeNullsafeToTernaryOperatorRector::class,
+		DowngradePropertyPromotionRector::class,
+		DowngradeStaticTypeDeclarationRector::class,
+		DowngradeTrailingCommasInParamUseRector::class,
+		DowngradeUnionTypeDeclarationRector::class,
+		DowngradeUnionTypeTypedPropertyRector::class,
+
+		GenericsPHPStormMethodAnnotationRector::class,
+	];
+
+    foreach ($rules as $rule)
+	{
+		$services->set($rule);
+	}
+};

src/Enum/Highlight.php

@@ -33,7 +33,7 @@ class Highlight {
 	 */
 	public static function fromPHPToken(int $token): int
 	{
-		return match($token) {
+		$token = match($token) {
 			// Delimiters
 			T_ARRAY,
 			T_CURLY_OPEN,
@@ -186,6 +186,8 @@ class Highlight {
 
 			default => Highlight::NORMAL,
 		};
+
+		return $token;
 	}
 
 	/**
@@ -197,7 +199,7 @@ class Highlight {
 	 */
 	public static function fromPHPChar(string $char): int
 	{
-		return match ($char) {
+		$hl = match ($char) {
 			// Delimiter characters
 			'[', ']', '{', '}', '(', ')', '"', "'" => Highlight::DELIMITER,
 
@@ -207,5 +209,7 @@ class Highlight {
 
 			default => Highlight::NORMAL,
 		};
+
+		return $hl;
 	}
 }

src/FileType.php

@@ -26,7 +26,7 @@ class FileType {
 	{
 		$ext = strstr(basename($filename), '.');
 		$ext = ($ext !== FALSE) ? $ext : '';
-		return match ($ext) {
+		$syntax = match ($ext) {
 			'.sh', '.bash' => Syntax::new(
 				'Shell',
 				[
@@ -127,6 +127,8 @@ class FileType {
 			),
 			default => Syntax::default(),
 		};
+
+		return $syntax;
 	}
 
 	private function __construct(public string $name, public Syntax $syntax) {}

src/Row.php

@@ -76,13 +76,15 @@ class Row {
 
 	public function __get(string $name): mixed
 	{
-		return match ($name)
+		$prop = match ($name)
 		{
 			'size' => strlen($this->chars),
 			'rsize' => strlen($this->render),
 			'chars' => $this->chars,
 			default => NULL,
 		};
+
+		return $prop;
 	}
 
 	/**

src/Terminal.php

@@ -87,7 +87,7 @@ class Terminal {
 	{
 		$c = Terminal::read();
 
-		return match($c)
+		$key = match($c)
 		{
 			// Unambiguous mappings
 			RawKeyCode::ARROW_DOWN => KeyType::ARROW_DOWN,
@@ -113,6 +113,8 @@ class Terminal {
 
 			default => $c,
 		};
+
+		return $key;
 	}
 
 	/**

src/functions.php

@@ -76,7 +76,7 @@ function is_digit(string $char): bool
  */
 function is_space(string $char): bool
 {
-	return match($char) {
+	$isSpace = match($char) {
 		RawKeyCode::CARRIAGE_RETURN,
 		RawKeyCode::FORM_FEED,
 		RawKeyCode::NEWLINE,
@@ -86,6 +86,8 @@ function is_space(string $char): bool
 
 		default => false,
 	};
+
+	return $isSpace;
 }
 
 // ----------------------------------------------------------------------------
@@ -158,7 +160,7 @@ function str_has(string $haystack, string $str, ?int $offset = NULL): bool
  */
 function syntax_to_color(int $hl): int
 {
-	return match ($hl)
+	$color = match ($hl)
 	{
 		Highlight::COMMENT => Color::FG_CYAN,
 		Highlight::ML_COMMENT => Color::FG_BRIGHT_BLACK,
@@ -175,6 +177,8 @@ function syntax_to_color(int $hl): int
 		Highlight::IDENTIFIER => Color::FG_BRIGHT_WHITE,
 		default => Color::FG_WHITE,
 	};
+
+	return $color;
 }
 
 /**
@@ -191,7 +195,7 @@ function tabs_to_spaces(string $str, int $number = KILO_TAB_STOP): string
 
 function error_code_name(int $code): string
 {
-	return 	match ($code) {
+	$errorName = match ($code) {
 		E_ERROR => 'Error',
 		E_WARNING => 'Warning',
 		E_PARSE => 'Parse Error',
@@ -208,6 +212,8 @@ function error_code_name(int $code): string
 		E_USER_DEPRECATED => 'User Deprecated',
 		default => 'Unknown',
 	};
+
+	return $errorName;
 }
 
 function saturating_add(int $a, int $b, int $max): int