Extract Translation Keys from JavaScript Files (#1713)

composer.json

@@ -34,7 +34,7 @@
     "friendsofphp/php-cs-fixer": "3.64.*"
   },
   "autoload": {
-    "classmap": ["src/", "src/controller/", "src/model/", "src/model/sparql/"]
+    "classmap": ["src/", "src/controller/", "src/model/", "src/util", "src/model/sparql/"]
   },
   "config": {
     "allow-plugins": {

config/services.yaml

@@ -16,3 +16,9 @@ services:
     LinkUrlExtension:
         class: 'LinkUrlExtension'
         public: true
+
+    Util\JsTranslationExtractor:
+        arguments:
+            $directory: '%kernel.project_dir%/resource/js'
+        tags:
+            - { name: 'translation.extractor', alias: 'js_translation_extractor' }

src/util/JsTranslationExtractor.php

@@ -0,0 +1,42 @@
+<?php
+
+namespace Util;
+
+use Symfony\Component\Translation\Extractor\ExtractorInterface;
+use Symfony\Component\Translation\MessageCatalogue;
+
+class JsTranslationExtractor implements ExtractorInterface
+{
+    public function __construct(string $directory)
+    {
+        $this->directory = $directory;
+    }
+
+    private string $prefix = '';
+
+    public function setPrefix(string $prefix): void
+    {
+        $this->prefix = $prefix ?: '';
+    }
+
+    public function extract($directory, MessageCatalogue $catalogue): void
+    {
+        if (!is_dir($this->directory)) {
+            echo "Invalid directory: $this->directory" . PHP_EOL;
+            return;
+        }
+        $iterator = new \RecursiveIteratorIterator(
+            new \RecursiveDirectoryIterator($this->directory)
+        );
+        foreach ($iterator as $file) {
+            if ($file->getExtension() !== 'js') {
+                continue;
+            }
+            $content = file_get_contents($file->getPathname());
+            preg_match_all('/\$t\([\'"]([^\'"]+)[\'"]\)/', $content, $matches);
+            foreach ($matches[1] as $key) {
+                $catalogue->set($this->prefix . $key, $key);
+            }
+        }
+    }
+}