Add a version selector

Author: ryangjchandler

app/Enums/PhpVersion.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace App\Enums;
+
+use PhpParser\Parser;
+use PhpParser\ParserFactory;
+use PhpParser\PhpVersion as ParserPhpVersion;
+
+enum PhpVersion: string
+{
+    case Php80 = '8.0';
+    case Php81 = '8.1';
+    case Php82 = '8.2';
+    case Php83 = '8.3';
+    case Php84 = '8.4';
+
+    public function toDisplayable(): string
+    {
+        return match ($this) {
+            self::Php80 => 'PHP 8.0',
+            self::Php81 => 'PHP 8.1',
+            self::Php82 => 'PHP 8.2',
+            self::Php83 => 'PHP 8.3',
+            self::Php84 => 'PHP 8.4',
+        };
+    }
+
+    public function toPhpParser(): Parser
+    {
+        return (new ParserFactory)->createForVersion(match ($this) {
+            self::Php80 => ParserPhpVersion::fromComponents(8, 0),
+            self::Php81 => ParserPhpVersion::fromComponents(8, 1),
+            self::Php82 => ParserPhpVersion::fromComponents(8, 2),
+            self::Php83 => ParserPhpVersion::fromComponents(8, 3),
+            self::Php84 => ParserPhpVersion::fromComponents(8, 4),
+        });
+    }
+
+    public static function toOptions(): array
+    {
+        return collect(self::cases())
+            ->mapWithKeys(fn (PhpVersion $case) => [
+                $case->value => $case->toDisplayable(),
+            ])
+            ->all();
+    }
+}

app/Http/Controllers/Api/GenerateController.php

@@ -2,28 +2,27 @@
 
 namespace App\Http\Controllers\Api;
 
+use App\Enums\PhpVersion;
 use App\Traverser\CollectSignificantNodeLocations;
 use Illuminate\Http\Request;
 use PhpParser\Error;
-use PhpParser\Lexer\Emulative;
 use PhpParser\NodeTraverser;
-use PhpParser\Parser\Php8;
-use PhpParser\PhpVersion;
 
 class GenerateController
 {
     public function __invoke(Request $request)
     {
         $code = $request->input('code');
-        $lexer = new Emulative(PhpVersion::getNewestSupported());
-        $parser = new Php8($lexer, PhpVersion::getNewestSupported());
+        $version = $request->enum('version', PhpVersion::class);
 
-        $ast = $parser->parse($code);
-
-        $traverser = new NodeTraverser($collector = new CollectSignificantNodeLocations());
-        $traverser->traverse($ast);
+        $parser = $version->toPhpParser();
 
         try {
+            $ast = $parser->parse($code);
+
+            $traverser = new NodeTraverser($collector = new CollectSignificantNodeLocations());
+            $traverser->traverse($ast);
+
             return response()->json([
                 'ast' => $ast,
                 'significantNodeLocations' => $collector->getSignificantNodeLocations(),

app/Http/Controllers/IndexController.php

@@ -2,12 +2,15 @@
 
 namespace App\Http\Controllers;
 
+use App\Enums\PhpVersion;
 use Illuminate\Http\Request;
 
 class IndexController
 {
     public function __invoke(Request $request)
     {
-        return view('index');
+        return view('index', [
+            'phpVersions' => PhpVersion::toOptions(),
+        ]);
     }
 }