refactor: improve PhpReader

src/DiagramElement/Package.php

@@ -36,7 +36,7 @@ public function getLogicalName(): string
     }
 
     /**
-     * @param string[] $paths Paths
+     * @param list<string> $paths
      */
     public function addEntry(array $paths, Entry $entry): string
     {

src/DiagramElement/Relation.php

@@ -19,7 +19,9 @@ public function __construct(array $entries, Options $options)
         $this->options = $options;
         $this->package = new Package([], 'ROOT', $options);
         foreach ($entries as $e) {
-            $this->package->addEntry(preg_split('/[\\\\\/]/', $e->getDirectory()), $e);
+            /** @var list<string> $paths */
+            $paths = preg_split('/[\\\\\/]/', $e->getDirectory());
+            $this->package->addEntry($paths, $e);
         }
     }
 

src/Php/PhpReader.php

@@ -5,46 +5,41 @@
 namespace Smeghead\PhpClassDiagram\Php;
 
 use PhpParser\Error;
-use PhpParser\ParserFactory;
-use PhpParser\Node\Stmt\{
-    Namespace_,
-    ClassLike,
-};
+use PhpParser\Node;
+use PhpParser\Node\Stmt\ClassLike;
+use PhpParser\Node\Stmt\Namespace_;
 use PhpParser\NodeTraverser;
 use PhpParser\NodeVisitor\NameResolver;
+use PhpParser\ParserFactory;
+use RuntimeException;
 use Smeghead\PhpClassDiagram\Config\Options;
 
 final class PhpReader
 {
-    private PhpClass $class;
+    private function __construct(
+        private PhpClass $class,
+    ) {
+    }
 
-    private function __construct(PhpClass $class)
+    public function getInfo(): PhpClass
     {
-        $this->class = $class;
+        return $this->class;
     }
 
     /**
-     * @return PhpReader[]
+     * @return list<PhpReader>
      */
     public static function parseFile(string $directory, string $filename, Options $options): array
     {
         $code = file_get_contents($filename);
 
-        $targetVesion = ParserFactory::PREFER_PHP7;
-        switch ($options->phpVersion()) {
-            case 'php5':
-                $targetVesion = ParserFactory::PREFER_PHP5;
-                break;
-            case 'php7':
-                $targetVesion = ParserFactory::PREFER_PHP7;
-                break;
-            case 'php8':
-                $targetVesion = ParserFactory::PREFER_PHP7; // php-parser でまだ php8 がサポートされていない。
-                break;
-            default:
-                throw new \Exception("invalid php version. {$targetVesion}\n");
-        }
-        $parser = (new ParserFactory)->create($targetVesion);
+        $targetVersion = match ($options->phpVersion()) {
+            'php5' => ParserFactory::PREFER_PHP5,
+            'php7', 'php8' => ParserFactory::PREFER_PHP7, // php-parser でまだ php8 がサポートされていない。
+            default => throw new RuntimeException(sprintf("invalid php version %s\n", ParserFactory::PREFER_PHP7)),
+        };
+
+        $parser = (new ParserFactory)->create($targetVersion);
         try {
             $ast = $parser->parse($code);
             $nameResolver = new NameResolver();
@@ -53,43 +48,45 @@ public static function parseFile(string $directory, string $filename, Options $o
             // Resolve names
             $ast = $nodeTraverser->traverse($ast);
         } catch (Error $error) {
-            throw new \Exception("Parse error: {$error->getMessage()} file: {$filename}\n");
+            throw new RuntimeException(sprintf("Parse error: %s file: %s\n", $error->getMessage(), $filename));
         }
 
         $relativePath = mb_substr($filename, mb_strlen($directory) + 1);
         $classes = [];
         foreach (self::getClasses($relativePath, $ast) as $class) {
             $classes[] = new self($class);
         }
+
         return $classes;
     }
 
     /**
-     * @param \PhpParser\Node[] $ast
-     * @return PhpClass[]|null
+     * @param list<Node> $ast
+     *
+     * @return list<PhpClass>
      */
-    private static function getClasses(string $relativePath, array $ast): ?array
+    private static function getClasses(string $relativePath, array $ast): array
     {
         if (count($ast) === 0) {
-            return null;
+            return [];
         }
+
         $classes = [];
         foreach ($ast as $element) {
             if ($element instanceof ClassLike) {
                 $classes[] = new PhpClass($relativePath, $element, $ast);
-            } else if ($element instanceof Namespace_) {
+                continue;
+            }
+
+            if ($element instanceof Namespace_) {
                 foreach ($element->stmts as $e) {
                     if ($e instanceof ClassLike) {
                         $classes[] = new PhpClass($relativePath, $e, $ast);
                     }
                 }
             }
         }
-        return $classes;
-    }
 
-    public function getInfo(): PhpClass
-    {
-        return $this->class;
+        return $classes;
     }
 }