Added placeholders filter to utilize the placeholders in twig mode

Fixes #546

src/Services/LabelSystem/LabelHTMLGenerator.php

@@ -53,7 +53,14 @@ use Twig\Error\Error;
 
 final class LabelHTMLGenerator
 {
-    public function __construct(private readonly ElementTypeNameGenerator $elementTypeNameGenerator, private readonly LabelTextReplacer $replacer, private readonly Environment $twig, private readonly LabelBarcodeGenerator $barcodeGenerator, private readonly SandboxedTwigFactory $sandboxedTwigProvider, private readonly Security $security, private readonly string $partdb_title)
+    public function __construct(
+        private readonly ElementTypeNameGenerator $elementTypeNameGenerator,
+        private readonly LabelTextReplacer $replacer,
+        private readonly Environment $twig,
+        private readonly LabelBarcodeGenerator $barcodeGenerator,
+        private readonly SandboxedTwigFactory $sandboxedTwigProvider,
+        private readonly Security $security,
+        private readonly string $partdb_title)
     {
     }
 

src/Services/LabelSystem/LabelTextReplacer.php

@@ -64,6 +64,17 @@ final class LabelTextReplacer
      * @return string If the placeholder was valid, the replaced info. Otherwise the passed string.
      */
     public function handlePlaceholder(string $placeholder, object $target): string
+    {
+        return $this->handlePlaceholderOrReturnNull($placeholder, $target) ?? $placeholder;
+    }
+
+    /**
+     * Similar to handlePlaceholder, but returns null if the placeholder is not known (instead of the original string)
+     * @param  string  $placeholder
+     * @param  object  $target
+     * @return string|null
+     */
+    public function handlePlaceholderOrReturnNull(string $placeholder, object $target): ?string
     {
         foreach ($this->providers as $provider) {
             /** @var PlaceholderProviderInterface $provider */
@@ -73,7 +84,7 @@ final class LabelTextReplacer
             }
         }
 
-        return $placeholder;
+        return null;
     }
 
     /**

src/Services/LabelSystem/SandboxedTwigFactory.php

@@ -64,6 +64,7 @@ use App\Twig\BarcodeExtension;
 use App\Twig\EntityExtension;
 use App\Twig\FormatExtension;
 use App\Twig\Sandbox\InheritanceSecurityPolicy;
+use App\Twig\Sandbox\SandboxedLabelExtension;
 use App\Twig\TwigCoreExtension;
 use InvalidArgumentException;
 use Twig\Environment;
@@ -92,6 +93,9 @@ final class SandboxedTwigFactory
 
         //FormatExtension:
         'format_money', 'format_si', 'format_amount', 'format_bytes',
+
+        //SandboxedLabelExtension
+        'placeholders',
         ];
 
     private const ALLOWED_FUNCTIONS = ['country_names', 'country_timezones', 'currency_names', 'cycle',
@@ -103,7 +107,8 @@ final class SandboxedTwigFactory
         'entity_type', 'entity_url',
         //BarcodeExtension:
         'barcode_svg',
-
+        //SandboxedLabelExtension
+        'placeholder',
         ];
 
     private const ALLOWED_METHODS = [
@@ -143,6 +148,7 @@ final class SandboxedTwigFactory
         private readonly BarcodeExtension $barcodeExtension,
         private readonly EntityExtension $entityExtension,
         private readonly TwigCoreExtension $twigCoreExtension,
+        private readonly SandboxedLabelExtension $sandboxedLabelExtension,
     )
     {
     }
@@ -172,6 +178,7 @@ final class SandboxedTwigFactory
         $twig->addExtension($this->barcodeExtension);
         $twig->addExtension($this->entityExtension);
         $twig->addExtension($this->twigCoreExtension);
+        $twig->addExtension($this->sandboxedLabelExtension);
 
         return $twig;
     }

src/Twig/Sandbox/SandboxedLabelExtension.php

@@ -0,0 +1,51 @@
+<?php
+/*
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ *  Copyright (C) 2019 - 2024 Jan Böhmer (https://github.com/jbtronics)
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published
+ *  by the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+declare(strict_types=1);
+
+
+namespace App\Twig\Sandbox;
+
+use App\Services\LabelSystem\LabelTextReplacer;
+use Twig\Extension\AbstractExtension;
+use Twig\TwigFilter;
+use Twig\TwigFunction;
+
+class SandboxedLabelExtension extends AbstractExtension
+{
+    public function __construct(private readonly LabelTextReplacer $labelTextReplacer)
+    {
+
+    }
+
+    public function getFunctions()
+    {
+        return [
+            new TwigFunction('placeholder', fn(string $text, object $label_target) => $this->labelTextReplacer->handlePlaceholderOrReturnNull($text, $label_target)),
+        ];
+    }
+
+    public function getFilters(): array
+    {
+        return [
+            new TwigFilter('placeholders', fn(string $text, object $label_target) => $this->labelTextReplacer->replace($text, $label_target)),
+        ];
+    }
+}

tests/Services/LabelSystem/SandboxedTwigFactoryTest.php

@@ -88,6 +88,10 @@ class SandboxedTwigFactoryTest extends WebTestCase
             '],
             ['
                 {{ entity_type(part) is object }}
+            '],
+            ['
+                {% apply placeholders(part) %}[[NAME]]{% endapply %}</br>
+                {{ placeholder("[[NAME]]", part) }}
             ']
         ];
     }