Add support for Twig function (#2)

* Adding support for twig functions

* CS

Author: Nyholm

composer.json

@@ -14,7 +14,8 @@
         "symfony/flex": "^1.3.1",
         "symfony/framework-bundle": "^5.2",
         "symfony/process": "^5.2",
-        "symfony/yaml": "^5.2"
+        "symfony/yaml": "^5.2",
+        "twig/twig": "^3.3"
     },
     "replace": {
         "symfony/polyfill-ctype": "*",

src/Listener/ValidCodeNodeListener.php

@@ -10,6 +10,7 @@
 use Symfony\Component\Process\Process;
 use Symfony\Component\Yaml\Exception\ParseException;
 use Symfony\Component\Yaml\Yaml;
+use SymfonyCodeBlockChecker\Twig\DummyExtension;
 use Twig\Environment;
 use Twig\Error\SyntaxError;
 use Twig\Loader\ArrayLoader;
@@ -125,12 +126,15 @@ private function validateYaml(CodeNode $node)
 
     private function validateTwig(CodeNode $node)
     {
-        $twig = $this->twig ?? new Environment(new ArrayLoader());
+        if (null === $this->twig) {
+            $this->twig = new Environment(new ArrayLoader());
+            $this->twig->addExtension(new DummyExtension());
+        }
 
         try {
-            $tokens = $twig->tokenize(new Source($node->getValue(), $node->getEnvironment()->getCurrentFileName()));
+            $tokens = $this->twig->tokenize(new Source($node->getValue(), $node->getEnvironment()->getCurrentFileName()));
             // We cannot parse the TokenStream because we dont have all extensions loaded.
-            // $twig->parse($tokens);
+            $this->twig->parse($tokens);
         } catch (SyntaxError $e) {
             $this->errorManager->error(sprintf(
                 'Invalid Twig syntax: %s',

src/Twig/DummyExtension.php

@@ -0,0 +1,82 @@
+<?php
+
+namespace SymfonyCodeBlockChecker\Twig;
+
+use Twig\Extension\AbstractExtension;
+use Twig\TwigFilter;
+use Twig\TwigFunction;
+
+/**
+ * This extension will contain filters and functions that exists in Symfony. This
+ * will help the parser to verify the correctness.
+ *
+ * @author Tobias Nyholm <[email protected]>
+ */
+class DummyExtension extends AbstractExtension
+{
+    public function getFunctions()
+    {
+        return [
+            new TwigFunction('asset'),
+            new TwigFunction('asset_version'),
+            new TwigFunction('csrf_token'),
+            new TwigFunction('dump'),
+            new TwigFunction('expression'),
+            new TwigFunction('form_widget'),
+            new TwigFunction('form_errors'),
+            new TwigFunction('form_label'),
+            new TwigFunction('form_help'),
+            new TwigFunction('form_row'),
+            new TwigFunction('form_rest'),
+            new TwigFunction('form'),
+            new TwigFunction('form_start'),
+            new TwigFunction('form_end'),
+            new TwigFunction('csrf_token'),
+            new TwigFunction('form_parent'),
+            new TwigFunction('absolute_url'),
+            new TwigFunction('relative_path'),
+            new TwigFunction('render'),
+            new TwigFunction('render_*'),
+            new TwigFunction('controller'),
+            new TwigFunction('logout_url'),
+            new TwigFunction('logout_path'),
+            new TwigFunction('url'),
+            new TwigFunction('path'),
+            new TwigFunction('is_granted'),
+            new TwigFunction('link'),
+            new TwigFunction('preload'),
+            new TwigFunction('dns_prefetch'),
+            new TwigFunction('preconnect'),
+            new TwigFunction('prefetch'),
+            new TwigFunction('prerender'),
+            new TwigFunction('workflow_can'),
+            new TwigFunction('workflow_transitions'),
+            new TwigFunction('workflow_has_marked_place'),
+            new TwigFunction('workflow_marked_places'),
+            new TwigFunction('workflow_metadata'),
+            new TwigFunction('workflow_transition_blockers'),
+        ];
+    }
+
+    public function getFilters()
+    {
+        return [
+            new TwigFilter('abbr_class'),
+            new TwigFilter('abbr_method'),
+            new TwigFilter('format_args'),
+            new TwigFilter('format_args_as_text'),
+            new TwigFilter('file_excerpt'),
+            new TwigFilter('format_file'),
+            new TwigFilter('format_file_from_text'),
+            new TwigFilter('format_log_message'),
+            new TwigFilter('file_link'),
+            new TwigFilter('file_relative'),
+            new TwigFilter('humanize'),
+            new TwigFilter('form_encode_currency'),
+            new TwigFilter('yaml_encode'),
+            new TwigFilter('yaml_dump'),
+            new TwigFilter('trans'),
+            new TwigFilter('transchoice'),
+        ];
+    }
+}

tests/Listener/ValidCodeNodeListenerTest.php

@@ -39,4 +39,15 @@ public function testInvalidYaml()
 
         $this->assertStringContainsString('Invalid Yaml', $errors[0]);
     }
+
+    public function testParseTwig()
+    {
+        $node = new CodeNode(['{{ form(form) }}']);
+        $node->setEnvironment($this->environment);
+        $node->setLanguage('twig');
+        $this->listener->postNodeCreate(new PostNodeCreateEvent($node));
+
+        $errors = $this->errorManager->getErrors();
+        $this->assertCount(0, $errors);
+    }
 }