upgrade nikic/php-parser to 5 version

.github/workflows/ci.yml

@@ -30,6 +30,26 @@ jobs:
         run: composer install -n --prefer-dist
       - name: Run PHPUnit
         run: php ./vendor/bin/phpunit
+  php-test-7_4-with-parser-4:
+    name: phpunit 7.4
+    runs-on: 'ubuntu-latest'
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '7.4'
+          tools: composer:v2
+          coverage: xdebug2
+      - name: Validate composer.json
+        run: composer validate --strict
+      - name: Run composer install
+        run: composer install -n --prefer-dist
+      - name: Run downgrade nikic/php-parser
+        run: composer require nikic/php-parser "^4.12"
+      - name: Run PHPUnit
+        run: php ./vendor/bin/phpunit
   php-test-8_0:
     name: phpunit 8.0
     runs-on: 'ubuntu-latest'

composer.json

@@ -23,7 +23,7 @@
   "require": {
     "php": "^7.4 | ^8.0",
     "webonyx/graphql-php": "^15.2",
-    "nikic/php-parser": "^4.12"
+    "nikic/php-parser": "^4.12 | ^5"
   },
   "require-dev": {
     "psr/container": "^1 | ^2",

src/Generator/Code/Foundation/CodeGenerator.php

@@ -29,6 +29,7 @@
 use PhpParser\NodeTraverser;
 use PhpParser\Parser;
 use PhpParser\ParserFactory;
+use PhpParser\PhpVersion;
 
 class CodeGenerator implements CodeGeneratorInterface
 {
@@ -51,7 +52,14 @@ public function __construct(
         ArgsFieldResolverModelGeneratorInterface $argsFieldResolverModelGenerator,
         ModelGeneratorInterface ...$generators
     ) {
-        $this->parser = (new ParserFactory())->create(ParserFactory::PREFER_PHP7);
+        $parserFactory = new ParserFactory();
+        // version of nikic/php-parser is v4
+        if (method_exists($parserFactory, 'create')) {
+            $this->parser = $parserFactory->create(ParserFactory::PREFER_PHP7);
+        } else {
+            // version of nikic/php-parser is v5
+            $this->parser = $parserFactory->createForVersion(PhpVersion::fromComponents(7, 4));
+        }
         $this->generators = $generators;
         $this->fieldResolversGenerator = $fieldResolversGenerator;
         $this->scalarResolverGenerator = $scalarResolverGenerator;